Manual No. A5596
®
GENERAC
Air-cooled Recreational
Vehicle Generator
OWNER’S MANUAL
General
Information
®
GENERAC
CORPORATION
Model No. 00919-0 Series NP-50LPG
THIS SYMBOL POINTS OUT IMPORTANT SAFETY INSTRUCTIONS, WHICH, IF NOT FOLLOWED, COULD ENDANGER THE
PERSONAL SAFETY AND/OR PROPERTY OF YOURSELF AND OTHERS. READ AND FOLLOW ALL INSTRUCTIONS IN THE
MANUAL BEFORE ATTEMPTING TO OPERATE THIS UNIT.
Revision 1 (6/1/98)
Printed in U.S.A.
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Generac NP-50LPG Recreational Vehicle Generator
IDENTIFI-
CATION
RECORD
Please record the following information from the generator DATA DECAL or information decal.
1. Model Number_______________________
2. Serial Number_________________
3. kW Rating___________________________
4. Rated Voltage__________________
14
13
12
1
15
SIDE VIEW
2
3
11
16
10
9
4
17
8
7
5
6
REFERENCE NUMBER IDENTIFICATION
1. Generator Air Intake Screen
2. Data Decal
10. Fuel Primer Switch
11. Circuit Breakers
12. Fuse
3. Oil Dipstick
4. Oil Filler Cap
5. Oil Drain Plug
6. Oil Filter
13. Engine Start/Stop Switch
14. Air Cleaner
15. Optional Remote Panel Receptacle
7. Fuel Regulator
8. Fuel Solenoid
9. Fuel Inlet
16. Generator AC Output Leads
17. Starter Contactor
R e c r e a t i o n a l V e h i c l e G e n e r a t o r
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Generac NP-50LPG Recreational Vehicle Generator
TABLE
OF
CONTENTS
SAFETY RULES................................................................2
IDENTIFICATION RECORD..............................................3
MAINTENANCE ........................................................13-16
Checking Engine Oil Level ........................................................13
Change Engine Oil....................................................................13
Change Oil Filter ......................................................................13
Engine Air Cleaner....................................................................14
Clean Air Intake Screen ............................................................14
Engine Spark Plug ....................................................................14
Spark Arrestor Muffler ..............................................................15
Cleaning the Generator ............................................................15
Battery ......................................................................................15
Major Service Manual ..............................................................16
Drive Belts ................................................................................16
Exercising the Generator ..........................................................16
Out of Service Protection ..........................................................16
Return the Unit to Service after Storage ..................................16
GENERAL FEATURES ....................................................3
READ THIS MANUAL THOROUGHLY ............................5
Operation and Maintenance........................................................5
How to Obtain Service ................................................................5
GENERATOR FAMILIARIZATION ....................................6
Generator Applicability................................................................6
Installation ..................................................................................6
Safety ..........................................................................................6
Generator AC Connection System..............................................6
OPERATION ................................................................7-11
Generator Control Panel ............................................................7
Optional Remote Start/Stop Panel..............................................7
Before Starting the Engine..........................................................8
Starting the Generator ............................................................8-9
Stopping the Generator ..............................................................9
Applying Loads to Generator ................................................9-10
Additional Information ..........................................................10-11
TROUBLESHOOTING ....................................................17
REPAIR PARTS..........................................................20-29
ELECTRICAL DATA ..................................................18-19
EMISSIONS WARRANTY ..........................................30-31
BASIC 3-YEAR WARRANTY ...........................back cover
SPECIFICATIONS ..........................................................12
Fuel Requirements....................................................................12
Engine Oil Requirements ..........................................................12
Engine Specifications................................................................12
Generator Specifications ..........................................................12
R e c r e a t i o n a l V e h i c l e G e n e r a t o r
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Generac NP-50LPG Recreational Vehicle Generator
EA
R
T
D
HI
S
ANUA
M
L
The operator (owner) is responsible for proper and safe use
of the vehicle, equipment on the vehicle, and the safety of all
vehicle occupants. We strongly recommend that the opera-
tor read this Owner’s Manual and thoroughly understand all
instructions before using this equipment. We also strongly rec-
ommend instructing other occupants in the vehicle to properly
start and operate the generator. This prepares them if they
need to operate the equipment in an emergency.
READ THIS MANUAL THOROUGHLY
If you don't understand any portion of this manual, contact Gen-
erac for a demonstration of actual starting, operating and
servicing procedures.
Throughout this publication and on tags and decals affixed to
the generator, DANGER and CAUTION blocks are used to alert
you to special instructions about a particular operation that may
be hazardous if performed incorrectly or carelessly. Observe
them carefully.
OPERATION AND MAINTENANCE
It is the operator's responsibility to perform all safety checks;
to make sure that all maintenance for safe operation is per-
formed promptly; and to have the equipment checked by an
Authorized Dealer periodically. Normal maintenance service
and replacement of parts are the responsibility of the
Owner/Operator and, as such, are not considered defects in
materials or workmanship within the terms of the warranty. Indi-
vidual operating habits and usage contribute to the need for
maintenance service.
These safety warnings cannot eliminate the hazards that they
indicate. Strict compliance with the special instructions while
performing the service plus “common sense” are major mea-
sures to prevent accidents.
The following definitions apply to DANGER, WARNING, CAU-
TION and NOTE blocks found throughout the manual.
DANGER: AFTER THIS HEADING YOU CAN READ
HANDLING, INSTALLING, OPERATING OR SERVIC-
ING INSTRUCTIONS THAT, IF NOT COMPLIED
WITH, WILL RESULT IN PERSONAL INJURY.
Proper maintenance and care of your recreational vehicle
generator assures a minimum number of problems and keeps
your operating expenses at a minimum. See your authorized
Dealer/Distributor for service aids and accessories.
WARNING: AFTER THIS HEADING YOU CAN READ
HANDLING, INSTALLING, OPERATING OR SERVIC-
ING INSTRUCTIONS THAT, IF NOT COMPLIED
WITH, MAY RESULT IN PERSONAL INJURY.
HOW TO OBTAIN SERVICE
When your recreational vehicle generator set requires servicing
or repairs, simply contact an Authorized Service Facility for
assistance. Service technicians are factory-trained and are
capable of handling all of your service needs.
CAUTION: After this heading you can read instruc-
tions for handling, installing, operating or
servicing the generator that, if not strictly com-
plied with, may result in damage to equipment
and/or property.
When contacting an Authorized Service Facility or the factory
about parts and service, always supply the complete model
number and serial number of your unit as given on its data
decal.
NOTE: After this heading you can read explanatory statements
that require special emphasis.
The warranty on your generator is included in the Owner’s
Manual, as well as listings for repair parts.
These symbols indicate the following:
Points out important safety information and, if not fol-
lowed, could endanger personal safety and/or property
of yourself and others.
SERVICE DEALER LOCATION
TO LOCATE THE NEAREST GENERAC SERVIC-
ING DEALER, PLEASE CALL OUR 800 NUMBER.
Potential explosion hazard.
ONLY DEALER LOCATION INFORMATION CAN BE
OBTAINED AT THIS NUMBER.
Potential fire hazard.
1-800-333-1322
Potential electrical shock hazard.
R e c r e a t i o n a l V e h i c l e G e n e r a t o r
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Generac NP-50LPG Recreational Vehicle Generator
GENERAL
INFORMA-
TION
Owners/Operators must make sure to do nothing that might
render the installation unsafe or in noncompliance with applic-
able codes, standards and instructions. They should be sure
the unit has been installed to allow adequate ventilation for cool-
ing and exhaust air.
GENERATOR APPLICABILITY
These generators have been designed and manufactured for
supplying electrical power for recreational vehicles. You should
not modify the generator or use it for any application other than
for what it was designed. If there are any questions pertain-
ing to its application, write or call the factory. Do not use the
unit until you have been advised by a competent authority.
SAFETY
Before attempting to use the generator set, carefully read
GENERAL SAFETY RULES inside the cover of this Manual.
Comply strictly with these RULES to prevent accidents and
damage to equipment and/or property. We suggest that copy-
ing and posting GENERAL SAFETY RULES in potential hazard
areas of the vehicle. Stress safety to all operators and poten-
tial operators of this equipment.
DANGER: FOR FIRE SAFETY, THE GENERATOR
MUST HAVE BEEN PROPERLY INSTALLED IN
COMPLIANCE WITH (1) ANSI 119.2-1975/NFPA
501C-1974 “STANDARD FOR RECREATIONAL
VEHICLES, PART III, “INSTALLATION OF ELECTRI-
CAL SYSTEMS.” THE GENERATOR ALSO MUST
HAVE BEEN INSTALLED IN STRICT COMPLIANCE
WITH THE MANUFACTURER’S DETAILED INSTAL-
LATION INSTRUCTIONS. AFTER INSTALLATION,
DO NOTHING THAT MIGHT RENDER THE UNIT IN
NON-COMPLIANCE WITH SUCH CODES, STAN-
DARDS AND INSTRUCTIONS.
GENERATOR AC CONNECTION
SYSTEM
This generator set is equipped with dual stator AC power
windings. These two stator windings supply electrical power
to customer electrical loads by means of a dual 2-wire con-
nection system. Note, however, that neutral is grounded.
You can use this generator to supply electrical power for oper-
ating 120/240 volts, single phase, 60 Hertz, AC electrical
loads. These loads can require up to 4500 watts of (4.5kW)
of power, but cannot exceed 37.5 AC amperes of current at
120 volts or exceed 18.8 AC amperes at 240 volts.
The generator may have been installed so that the unit powers
120 volt AC loads (Figure 1); or you can wire them to connect
both 120 and/or 240 volt AC electrical loads. Be sure to install
jumper wire between the circuit breakers when reconnecting
for 120/240 volts. Refer to the Installation Manual for more
information.
CAUTION: Do not overload the generator. Some
installations may require that electrical loads be
alternated to avoid overloading. Applying exces-
sively high electrical loads may damage the
generator and may shorten its life. Add up the
rated watts of all electrical lighting, appliance, tool
and motor loads the generator will power at one
time. This total should not be greater than the
wattage capacity of the generator. If an electrical
device nameplate gives only volts and amps, multi-
ply volts times amps to obtain watts (volts x amps
= watts). Some electric motors require more watts
of power (or amps of current) for starting than for
continuous operation.
Figure 1 — Connections for 120 Volts Only
INSTALLATION
This Owner’s Manual has been prepared under the assump-
tion that a competent, qualified technician installed the
generator. We also assume the installer complied with all
applicable codes, standards and regulations pertaining to
installation.
R e c r e a t i o n a l V e h i c l e G e n e r a t o r
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Generac NP-50LPG Recreational Vehicle Generator
MAIN BREAKER
GENERATOR CONTROL PANEL
Mounted on the generator control panel (Figure 2) are the fol-
lowing features:
Protects generators AC output circuit against overload and pro-
vides a method of turning OFF the generators 120/240 volts
AC output to vehicle circuits. The NP-50LPG has one 20 amp
breaker and one 30 amp breaker.
Figure 2 — Generator Control Panel
NOTE: If the Series NP-50LPG has been reconnected for dual
voltage AC output (120/240 volts), you can install line break-
ers having an amperage rating that is different than stated
above. The replacement line breakers consist of two sepa-
rate breakers with a connecting piece between the breaker
handles (so that both breakers will operate at the same time).
If the unit is reconnected for dual voltage, IT IS NO LONGER
RVIA LISTED.
OPTIONAL REMOTE
START/STOP PANEL
A remote mounted Start/Stop Panel is available, which allows
you to start and stop the generator engine conveniently from
inside the vehicle.
Figure 3 — Optional Remote Panel (Model 9042)
FUEL PRIMER
Before starting a cold engine (if it has not been started in more
than two weeks), you must press this switch to bring fuel from
the tank to the fuel regulator. This rocker type switch springs
back into its original position when you release it.
START/STOP SWITCH
To crank and start the engine, hold this switch at its START
position. Release the switch when the engine starts. To stop
an operating engine, press and hold the switch in its STOP
position until the engine shuts off. The switch center position
is the RUN position.
FUSE
Protects the engine DC control circuit against electrical over-
load. If the fuse element has melted open due to overloading,
the engine cannot be cranked. If you must replace it, use only
an identical replacement fuse.
R e c r e a t i o n a l V e h i c l e G e n e r a t o r
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Generac NP-50LPG Recreational Vehicle Generator
DANGER: The generator engine gives off DEADLY
BEFORE STARTING THE ENGINE
IMPORTANT: INSTRUCTIONS AND INFORMATION IN THIS
MANUAL ASSUME THE GENERATOR HAS BEEN PROP-
ERLY INSTALLED, CONNECTED, SERVICED, TESTED AND
ADJUSTED BY A QUALIFIED INSTALLATION TECHNICIAN
OR INSTALLATION CONTRACTOR.
carbon monoxide gas through its exhaust system.
This dangerous gas, if breathed in sufficient con-
centrations, can cause unconsciousness or even
death. DO NOT OPERATE THE GENERATOR IF
THE EXHAUST SYSTEM IS LEAKING OR HAS
BEEN DAMAGED. SYMPTOMS OF CARBON
MONOXIDE POISONING ARE (a) inability to think
coherently; (b) vomiting; (c) twitching muscles; (d)
throbbing temples; (e) dizziness; (f) headaches;
(g) weakness and sleepiness. IF YOU FEEL ANY
OF THESE SYMPTOMS, MOVE INTO FRESH AIR
IMMEDIATELY. IF SYMPTOMS PERSIST, GET MED-
ICAL HELP.
INSTALLATION
Generator installation must have been properly completed so
it complies with all applicable codes, standards and regula-
tions and with the manufacturer's recommendations.
ENGINE LUBRICATION
Have engine crankcase properly serviced with recommended
oil before starting. Refer to MAINTENANCE and SPECIFI-
CATIONS sections for oil servicing procedures and
recommendations.
STARTING THE GENERATOR
IMPORTANT: Read the vehicle manufacturer’s instructions.
The owner/operator should become familiar with the vehicle
in which the generator is installed. Differences exist between
vehicles. For example, some vehicles may use a transfer
switch to isolate dockside power from the generator, while other
vehicles may use an isolating receptacle. Some vehicles may
be equipped with a DC converter which allows the generator
to power certain DC lighting and other DC loads.
CAUTION: Any attempt to crank or start the engine
before you have properly serviced it with the recom-
mended oil may result in an engine failure.
FUEL SUPPLY
The engine must have adequate supply of proper fuel to oper-
ate. Before starting, check that sufficient fuel is available.
To start the generator from either the generator control panel
or from the optional Remote Panel, proceed as follows:
1. Turn OFF electrical loads, using whatever means provided
in your vehicle (such as a main line circuit breaker or trans-
fer switch).
COOLING AND VENTILATING AIR
Air inlet and outlet openings in generator compartment must
be open and unobstructed for continued proper operation.
Without sufficient cooling and ventilating air flow, the engine-
generator quickly overheats which causes it to shutdown and
it could damage the generator.
NOTE: If starting from the generator panel, turn OFF loads
by setting the generator’s main circuit breaker to “OFF” or
“OPEN”. If starting from a Remote Panel, turn OFF loads using
whatever means is provided in the vehicle (such as a main cir-
cuit breaker). Electrical load circuits will be turned ON after
the generator has started, stabilized and warmed up.
ENGINE EXHAUST GAS
Before starting the generator engine, you should be sure there
is no way for exhaust gases to enter the vehicle interior and
endanger people or animals. Close windows, doors and other
openings in the vehicle that, if open, might permit exhaust gases
to enter the vehicle.
2. If you have not started the engine in more than two weeks,
press the Fuel Primer switch and hold it for about 30 seconds
to prime fuel system. However, if the engine is warm, skip Step
2.
R e c r e a t i o n a l V e h i c l e G e n e r a t o r
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Generac NP-50LPG Recreational Vehicle Generator
3. Hold the engine Start/Stop Switch at START to crank engine.
Release the switch when the engine starts.
LET ENGINE STABILIZE
The generator supplies correct rated voltage only at proper
governed speed. Some electrical appliances may be extremely
sensitive to voltage. Incorrect voltages can damage those
appliances.
If electrical loads are applied at reduced operating speeds,
such loads imposed on the engine when sufficient power is not
available may shorten engine life. Never turn ON electrical
loads until after the generator engine has started and stabi-
lized ON-speed.
CAUTION: If the engine does not start after it has
been cranking for 15 seconds, release the
start/stop switch and try again. Holding the switch
for longer than 15 seconds can damage the starter
motor.
4. Let the engine run at no-load for a few minutes to stabilize
and warm up.
5. Turn ON electrical loads, using whatever means provided
(such as a main circuit breaker or transfer switch).
DO NOT OVERLOAD THE GENERATOR
You can read the rated wattage/amperage capacity of your gen-
erator on the generator data decal (see “Identification Record”
on Page 3).
STOPPING THE GENERATOR
1. Turn OFF all electrical loads, using whatever means pro-
vided (such as a main circuit breaker or transfer switch).
Applying electrical loads in excess of the unit’s rated capac-
ity will cause the engine-generator to automatically shutdown.
2. Let unit run a few minutes to stabilize temperature.
3. Hold the Start/Stop switch in its STOP position until engine
comes to a complete stop.
To avoid overloading, add up the wattage of all connected elec-
trical lighting, appliance, tool and motor loads. This total should
not be greater than the generator’s rated wattage capacity.
APPLYING LOADS TO GENERATOR
When applying electrical loads to the generator, observe these
guidelines:
Most lighting, appliance, tool, and motor loads indicate their
required watts on their nameplate or data plate. For light
bulbs, simply note the wattage rating of the bulb.
Before applying electrical loads, let the generator stabilize
and warm up for a minute or two.
If a load does not show its rated wattage, multiply that load’s
rated VOLTS times AMPS to obtain WATTS.
DO NOT overload the generator.
WATTAGE REFERENCE GUIDE
RUNNING
WATTS
RUNNING
WATTS
*Air Conditioner (12,000 Btu) ..........................................1700
Battery Charger (20 amp) ................................................500
Belt Sander (3”) ..............................................................1000
Chain Saw ......................................................................1200
Circular Saw (6-12”) ............................................800 to 1000
Coffee Maker ..................................................................1000
*Compressor (1HP) ........................................................2000
*Deep Freeze ....................................................................500
Disc Sander (9”)..............................................................1200
Electric Range (one element) ........................................1500
Electric Skillet..................................................................1250
*Furnace Fan (1/3 HP)....................................................1200
Hair Dryer........................................................................1200
Hand Drill (1”)..................................................................1100
Hedge Trimmer ................................................................450
Impact Wrench..................................................................500
Lawn Mower....................................................................1200
Light Bulb ..........................................................................100
Microwave Oven................................................................700
*Milk Cooler ....................................................................1100
Oil Burner on Furnace ......................................................300
Oil Fired Space Heater (140,000 Btu) ..............................400
*Paint Sprayer, Airless (1/3 HP) ........................................600
Radio........................................................................50 to 200
*Refrigerator......................................................................600
Slow Cooker......................................................................200
*Submersible Pump (1-1/2 HP) ......................................2800
*Submersible Pump (1 HP) ............................................2000
*Table Saw (10”) ................................................1750 to 2000
Television ..........................................................1750 to 2000
* Allow 2-1/2 times the listed watts for starting these devices.
R e c r e a t i o n a l V e h i c l e G e n e r a t o r
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Generac NP-50LPG Recreational Vehicle Generator
Induction type motors (such as those that run the vehicle’s
FIELD BOOST
furnace fan, refrigerator, air conditioner, etc.) need about 2-
1/2 time more watts of power for starting than for running
(for a few seconds during motor starting). Be sure to allow
for this when connecting electrical loads to the generator.
First, figure the watts needed to start electric motors in the
system. To that figure, add the running wattages of other
items that will be operated by the generator.
The Controller Circuit Board houses a field boost diode and
resistor which are part of a “field boost” circuit (Figure 5).
During engine cranking only, a positive DC (battery) voltage
is delivered through the diode, resistor, brushes and slip rings,
and the generator rotor. Application of this voltage to the
rotor “flashes the field” whenever it is started. Flashing of the
field each time the generator starts makes sure that a suffi-
ciently strong magnetic field is available to produce “pick-up”
voltage in the stator windings.
Do not apply heavy electrical loads for the first two or three
hours of operation.
ADDITIONAL INFORMATION
This section discusses some the the engine protective devices,
overload protection and breaking in a new generator.
Figure 5 — Field Boost Circuit
AUTOMATIC LOW OIL PRESSURE
SHUTDOWN
The engine is equipped with a normally-closed (N.C.) oil pres-
sure switch (Figure 4). Engine oil pressure holds the switch
open during cranking and operation. Should oil pressure drop
below a pre-set level, the switch contacts close and the engine
automatically shuts down.
HIGH TEMPERATURE SHUTDOWN
A temperature switch (Figure 4) with normally-open (N.O.) con-
tacts is mounted near the oil filter. If engine temperature were
to exceed about 284°F (140°C), the switch contacts close
and the engine shuts down.
OVERVOLTAGE PROTECTION
A solid state voltage regulator (Figure 6) controls the gener-
ator’s AC output voltage. This regulator supplies an excitation
current to the rotor. By regulating the rotor’s excitation cur-
rent, the strength of its magnetic field is regulated and, in
turn, the voltage delivered to connected electrical loads is
controlled. When the AC frequency is 60 Hz, voltage is reg-
ulated at 120 volts (voltage-to-frequency ratio is 2-to-1).
Figure 4 — Switches for Engine
Safety Shutdown
HIGH TEMPERATURE
SWITCH
Figure 6 — Solid State Voltage Regulator
LOW OIL PRESSURE SWITCH
R e c r e a t i o n a l V e h i c l e G e n e r a t o r
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Generac NP-50LPG Recreational Vehicle Generator
The voltage regulator also incorporates a “voltage surge pro-
ATTENTION REQUIRED AFTER SUB-
MERSION
If the recreational vehicle generator has been submerged in
water, it must NOT be started or operated. Following any sub-
mersion in water, have an authorized Generac Service Facility
thoroughly clean and dry the generator.
tection circuit.” This circuit prevents troublesome surges in the
generator AC output voltage. Voltage surge is a common cause
of damage to electronic equipment.
25-HOUR BREAK IN PERIOD
The first 25 hours of operation is the break-in period for the
generator. Properly breaking in the generator is essential to
minimize fuel consumption and provide maximum engine per-
formance. During this 25-hour break in period, follow this
procedure:
OPERATING PRECAUTIONS
Never operate the generator set while the vehicle is parked
over dry leaves, dry grass or any other combustible substance.
The generator’s exhaust system becomes extremely hot and
can cause fire if it is too close to combustible materials.
The generator’s exhaust system gives off DEADLY carbon
monoxide gas. this dangerous gas, if breathed in sufficient
concentrations, can cause unconsciousness and even death.
never operate the generator set with the vehicle inside any
garage or enclosed area. Never operate the generator if it has
a leaky exhaust system. Close windows in the vicinity of the
generator exhaust outlet and take any other steps to prevent
exhaust gases from entering rooms or areas occupied by
people or animals.
• Run the unit at varying electrical loads, to help seat engine
piston rings properly.
• For the 75-hour operation following the break in period,
avoid light electrical loads. Load the generator at 50% (or
more) of its rated wattage capacity. Repeated light loads
during these 75 hours can cause improper seating of engine
piston rings, resulting in blowby and high oil consumption.
• Check engine oil level frequently. Add oil if needed. It is
normal for the generator engine to consume more oil than
is normal until the piston rings have properly seated.
EFFECTS OF MOISTURE AND DIRT
• After operating the unit for 25 hours, complete the tasks rec-
ommended under “25-Hour Check Up.”
Keep the generator set as clean and dry as possible. Protect
the unit against excessive dust, dirt, corrosive vapors, road
splash, etc. Permitting dirt and moisture to accumulate on
generator windings will have an adverse effect on the insula-
tion resistance of those windings.
When moisture is allowed to remain in contact with windings,
some of the moisture will be retained in voids and cracks in the
insulation. This causes a reduced insulation resistance and
will eventually cause problems. Dirt will make the problem
worse, since dirt tends to hold moisture in contact with wind-
ings. Salt (as from sea air) will also worsen the problem since
it tends to absorb moisture from the air. Salt and moisture,
when combined, form a good electrical conductor.
25-HOUR CHECK UP
After the 25-hour break-in period, contact an authorized ser-
vice facility for the following maintenance. The vehicle owner
is responsible for any charges:
• Change engine crankcase oil and oil filter.
Check oil level.
• Inspect cooling and ventilation openings.
Check engine carburetor.
• Check engine ignition system.
• Inspect entire electrical system.
• Inspect the engine exhaust system.
OPERATION IN HIGH GRASS
OR BRUSH
WARNING: NEVER OPERATE THE GENERATOR
WHILE THE VEHICLE IS PARKED IN HIGH GRASS,
WEEDS, BRUSH OR LEAVES. SUCH MATERIALS
CAN IGNITE AND BURN FROM THE HEAT OF THE
EXHAUST SYSTEM. THE GENERATOR EXHAUST
BECOMES EXTREMELY HOT DURING OPERATION
AND REMAINS HOT FOR A LONG TIME AFTER IT
HAS SHUT DOWN.
R e c r e a t i o n a l V e h i c l e G e n e r a t o r
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Generac NP-50LPG Recreational Vehicle Generator
FUEL REQUIREMENTS
SPECIFICATIONS
The “NP” series generator is equipped with a liquefied petro-
leum (LP) gas fuel system. LP gas is usually supplied as a
liquid in pressure tanks.
ENGINE
Type of Engine ....................................................GN-410, single-cylinder
Cooling Method ........................................................................Air-cooled
Rated Horsepower ..........................................................15 at 4200 RPM
Displacement ..................................................................................407cc
Cylinder Block ........................................Aluminum with cast iron sleeve
Type of Governor................................................Mechanical, fixed speed
Air Cleaner ....................................Paper element with foam pre-cleaner
Starter..........................................................................12 volt DC electric
Ignition System ........................................................................Solid State
Recommended Spark Plugs
“NP” series generators require a “vapor withdrawal” type fuel
system. This type of gaseous fuel system uses the vapors
forming above the liquid fuel in the storage tank. Air temper-
ature around the storage tank must be high enough to sustain
adequate fuel vaporization. In colder climates, you may need
to use an independent heat source to be sure the fuel suffi-
ciently vaporizes in the storage tank.
LP gas may consist of propane, butane or a mixture of two
gases. Using fresh HD-5 LP is recommended. Fuel should
not contain more than 2.5% butane. Propane vaporizes at tem-
peratures as low as -20°F (-29°C), but butane returns to its
liquid state when the temperature drops below about 32°F
(0°C). For that reason, a higher ratio of propane is desired in
the gas mixture when temperatures drop below freezing.
Champion................................................................................RC12YC
AC ................................................................................................R45S
Autolite ..............................................................................................65
Spark Plug Gap........................................................0.030 inch (0.76mm)
GENERATOR
Rotor RPM ........................................................................................3600
Rotor Poles..............................................................................................2
Engine RPM......................................................................................2571
Rated Maximum Continuous
FUEL CONSUMPTION
(CUBIC FEET PER HOUR)
The following lists the approximate amount of fuel the unit con-
sumes at 100% rated load. Actual fuel consumption may
vary depending on BTU content of fuel, applied load, ambi-
ent conditions, engine condition, etc.
AC Output ................................................................4500 watts (4.5 kW)
Voltage ......................................................................................120 volts*
Rated Maximum Continuous AC Current............................37.5 amperes
Phase ..............................................................................................single
Frequency....................................................................................60 Hertz
Weight ...................................................................... 197 pounds (93 kg)
Length ...................................................................... 25 inches (635mm)
Width ...................................................................... 18.5 inches (470mm)
Height ....................................................................15.75 inches(400mm)
* The unit is reconnectable to 120 and/or 240 volts, dual voltage output.
Rated maximum continuous current at 240 volts is 18.8 amps.
Propane ..............................................47 cubic ft. per hour
ENGINE OIL REQUIREMENTS
Use a high quality detergent oil classified “For Service SF” and
with an oil viscosity rating of SAE 10W-30 oil. Do not pour in
any additives to the recommended oil. Engine crankcase
capacity is 1.5 U.S. quarts (1.4 liters). See MAINTENANCE
section for oil level check and filling procedures.
R e c r e a t i o n a l V e h i c l e G e n e r a t o r
12
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Generac NP-50LPG Recreational Vehicle Generator
This section includes information about simple maintenance
which includes the following tasks.
• With engine still warm, remove oil drain cap from oil drain
hose (Figure 8). Drain oil completely into a suitable con-
tainer.
• Checking engine oil level
• Changing engine oil
Figure 8 — Location of Oil Drain Cap
• Changing oil filter
OIL DRAIN CAP
• Clean or change the air cleaner
• Cleaning the air intake screen
• Cleaning spark plug
CHECKING ENGINE OIL LEVEL
Check engine crankcase oil level at least every eight hours of
operation, or before you use it.
Be sure the generator is as level as possible.
• Remove OIL DIPSTICK (Figure 7) and wipe it dry with clean,
lint-free cloth.
• When oil has drained, install and tighten oil drain cap.
• Install and tighten oil dipstick then remove again.
• Remove oil fill cap and fill crankcase with the recommended
oil (see Page 12). The engine crankcase can hold about 1.4
liters. DO NOT FILL ABOVE “FULL” MARK.
• Oil level should be at the dipstick “FULL” mark. If necessary,
add oil to the “FULL” mark only. DO NOT FILL ABOVE THE
“FULL” MARK.
• Install and tighten oil dipstick and oil fill cap before operat-
ing engine.
• Install and tighten oil dipstick before operating the engine.
NOTE: See “Engine Oil Requirements” on Page 12 for rec-
ommended oils.
CHANGE OIL FILTER
Change engine oil filter after the first 25 hours of operation,
every 100 operating hours thereafter.
Figure 7 —Oil Dipstick and Oil Fill Cap
• Turn oil filter counterclockwise to remove (Figure 9).
• Coat gasket of new filter with engine oil.
• Turn new filter clockwise until its gasket contacts lightly with
the filter adapter. Then tighten with an additional 3/4 to one
turn by hand.
OIL DIPSTICK
OIL FILL CAP
• Run engine and check for leaks.
NOTE: Check oil level and fill to full mark after checking for
leaks. Filter will retain some oil.
Figure 9 — Engine Oil Filter
CHANGE ENGINE OIL
Change engine oil after the first 25 hours of operation (after
the 25-hour break-in period, Page 11). Thereafter, change oil
every 50 operating hours. Change oil more frequently if oper-
ating consistently under heavy load or at high ambient
temperatures. To change oil, proceed as follows:
• Run engine for at least 5 minutes, then shut down.
R e c r e a t i o n a l V e h i c l e G e n e r a t o r
13
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Generac NP-50LPG Recreational Vehicle Generator
Clean air cleaner cover then insert pre-cleaner into cover.
ENGINE AIR CLEANER
Clean and re-oil the foam pre-cleaner every three months or
every 25 operating hours, whichever comes first. Service
more frequently if operating under extremely dusty or dirty con-
ditions (Figure 10):
Next insert new paper filter into cover to hold pre-cleaner
in place and assemble all of them to the base of the air
cleaner.
CLEAN AIR INTAKE SCREEN
Clean all foreign material from air intake screen (Figure 11)
at least once every 100 hours of operation. Clean more often
if necessary.
• Remove both screws to loosen cover.
• Remove the COVER, FOAM PRE-CLEANER and PAPER
FILTER.
Inspect the area around the generator exhaust muffler peri-
odically and remove all grass leaves, dirt, etc.from this area.
• Remove foam pre-cleaner from cover.
• Wash foam pre-cleaner in liquid detergent and water.
• Wrap foam pre-cleaner in a cloth and squeeze dry.
Figure 11 — Cleaning Air Intake Screen
• Saturate foam pre-cleaner in engine oil. Squeeze to remove
excess oil (Do not twist foam pre-cleaner).
CLEAN AREAS
• Install foam pre-cleaner into cover, followed by paper filter.
• Install cover, foam pre-cleaner and paper filter.
• Tighten both screws to retain.
Once each year or every 100 hours of operation (whichever
comes first), replace the paper filter. The new replacement
filter must be a flame retardant type.
Figure 10 — Engine Air Cleaner
ENGINE SPARK PLUG
Clean engine spark plug and set gap to 0.030 inch (0.76mm)
every 100 hours of operation (Figure 12). Clean by scraping
or wire brushing and washing with commercial solvent. DO
NOT BLAST CLEAN SPARK PLUG.
CAUTION: Sparking can occur if wire terminal
does not fit firmly on spark plug terminal end. If
necessary, reform wire terminal to obtain a tight fit.
Figure 12 — Setting Spark Plug Gap
CLEAN OR REPLACE AIR FILTER
Remove air cleaner cover; then remove foam pre-cleaner
(service if necessary) and remove paper filter.
Clean air filter by tapping it gently on a solid surface. If the
filter is too dirty, replace it with a new one. Dispose of the
old filter properly.
R e c r e a t i o n a l V e h i c l e G e n e r a t o r
14
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Generac NP-50LPG Recreational Vehicle Generator
SPARK ARRESTOR MUFFLER
BATTERY
If the generator is not equipped with a spark arrestor exhaust
muffler and is to be used on any forest covered, brush cov-
ered or grass covered unimproved land, you may have to
install a spark arrestor. The spark arrestor must be maintained
in effective working order by the vehicle owner/operator.
All lead-acid storage batteries will discharge when not in use.
The generator battery should be inspected as follows:
ONCE WEEKLY
Inspect battery posts and cables for tightness, corrosion.
Clean and/or tighten as needed.
For assistance in ordering, installing and maintaining spark
arrestor exhaust mufflers, contact your nearest authorized
service facility.
Also check battery fluid level, and, if necessary, fill with DIS-
TILLED WATER ONLY. DO NOT USE TAP WATER IN
BATTERY.
Exhaust mufflers supplied by Generac are spark arrestor
types. Generac exhaust muffler for recreational vehicle gen-
erators do not have a spark arrestor screen, but are of the more
efficient “toroid” or “swirl” type. To remove carbon and com-
bustion deposits from such mufflers, remove the PLUG from
the muffler and run engine for about 15 minutes. Shut engine
down, let the muffler cool and install the plug.
EVERY SIX MONTHS
Have battery state of charge and condition checked. This
should be done with an automotive type battery hydrometer.
DANGER: STORAGE BATTERIES GIVE OFF
EXPLOSIVE HYDROGEN GAS. THIS GAS CAN
FORM AN EXPLOSIVE MIXTURE AROUND THE
BATTERY FOR SEVERAL HOURS AFTER CHARG-
ING. THE SLIGHTEST SPARK CAN IGNITE THE
GAS AND CAUSE AN EXPLOSION. SUCH AN
EXPLOSION CAN SHATTER THE BATTERY AND
CAUSE BLINDNESS OR OTHER INJURY. ANY
AREA THAT HOUSES A STORAGE BATTERY MUST
BE PROPERLY VENTILATED DO NOT ALLOW
SMOKING, OPEN FLAME, SPARKS OR ANY
SPARK PRODUCING TOOLS OR EQUIPMENT
NEAR THE BATTERY.
WARNING: BE SURE TO RE-INSTALL THE PLUG
FROM THE MUFFLER TIGHTLY. ENGINE VIBRATION
COULD CAUSE A LOOSE PLUG TO FALL OUT.
WITHOUT THE PLUG IN PLACE, HOT ENGINE
EXHAUST IS DIRECTED OUT THE OPENING. THIS
HOT EXHAUST, DEPENDING ON THE INSTALLA-
TION, COULD BE DIRECTED TO AREAS NOT ABLE
TO WITHSTAND THE EXTREME HEAT SUCH AS
WOODEN FLOOR BOARDS OR OTHER FLAMMA-
BLE MATERIAL. THIS COULD RESULT IN A FIRE.
CLEANING THE GENERATOR
Keep your generator set as clean and dry as possible. Dirt
and moisture that are permitted to accumulate on electrical
windings have an adverse affect on the insulation resistance
of those windings.
DANGER: BATTERY ELECTROLYTE FLUID IS AN
EXTREMELY CAUSTIC SULFURIC ACID SOLUTION
THAT CAN CAUSE SEVERE BURNS. DO NOT
PERMIT FLUID TO CONTACT EYES, SKIN, CLOTH-
ING, PAINTED SURFACES, ETC. WEAR
PROTECTIVE GOGGLES, PROTECTIVE CLOTHING
AND GLOVES WHEN HANDLING A BATTERY. IF
YOU SPILL THE FLUID, FLUSH THE AFFECTED
AREA IMMEDIATELY WITH CLEAR WATER.
Moisture that is allowed to remain in contact with windings will
be retained in voids and cracks of the windings. Dirt makes
the problem worse, since it tends to hold the moisture into con-
tact with the windings. Salt, as from sea air, worsens the
problem since it tends to absorb moisture from the air. The
combination of salt and moisture makes a good electrical con-
ductor.
DANGER: DO NOT USE ANY JUMPER CABLES
OR BOOSTER BATTERY TO CRANK AND START
THE GENERATOR ENGINE. IF ANY BATTERY HAS
DISCHARGED, REMOVE IT FOR RECHARGING.
CAUTION! Do NOT use a forceful spray of water to
clean the generator. Water will enter the generator
interior and cause problems, and may also conta-
minate the generator fuel system.
R e c r e a t i o n a l V e h i c l e G e n e r a t o r
15
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Generac NP-50LPG Recreational Vehicle Generator
• Remove spark plug and pour about two or three table-
MAJOR SERVICE MANUAL
To obtain a service manual for your generator, order it from
your dealer/distributor or contact the factory. Be sure to iden-
tify your MODEL NUMBER and SERIAL NUMBER.
spoons of clean, fresh engine oil into spark plug threaded
opening. Crank engine several times to distribute oil, then
install and tighten spark plug.
• Remove the battery and store in a cool, dry room on a
wooden board. Never store the battery on concrete or earth
floors.
DRIVE BELT
The engine drives the generator rotor by means of a pulley
and drive belt arrangement. The drive belt and pulleys are war-
ranted for the life of the generator. Drive belt tension was
properly adjusted before the unit was shipped from the fac-
tory. If you suspect that drive belt tension is incorrect, contact
an authorized service facility.
• Clean and wipe the entire generator.
RETURN THE UNIT TO SERVICE
AFTER STORAGE
To return the unit to service after storage, proceed as follows:
• Check tag on engine for oil viscosity and classification.
Verify that the correct recommended oil is used in engine.
If necessary, drain and refill with proper oil.
EXERCISING THE GENERATOR
Generac recommends that you start and operate the genera-
tor at least once every seven days. Let the unit run for at least
30 minutes to “exercise” the engine.
• Check battery. Fill all cells to the proper level with distilled
water. DO NOT USE TAP WATER IN THE BATTERY.
Recharge battery to 100% state of charge, or, if defective,
replace the battery.
OUT OF SERVICE PROTECTION
If you cannot exercise the generator every seven days and it
is to be out of service longer than 30 days, prepare the gen-
erator for storage as follows:
• Turn OFF all electrical loads, add fuel if necessary, then start
the engine.
• Start the engine and let it warm up.
• Let the engine warm up.
• Close the fuel shutoff valve in the fuel supply line and let
the engine “run out of fuel.”
• Apply electrical loads to at least 50% of the unit’s rated
wattage capacity.
• While the engine is still warm from running, drain the oil com-
pletely. Refill crankcase with SAE 10W30 oil having API
classification “For Service SF.”
• When engine is thoroughly warmed up, shut it down.
THE GENERATOR IS NOW READY FOR SERVICE.
• Attach a tag to the engine indicating the viscosity and clas-
sification of the oil in the crankcase.
R e c r e a t i o n a l V e h i c l e G e n e r a t o r
16
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Generac NP-50LPG Recreational Vehicle Generator
TROUBLESHOOTING POINTS
PROBLEM
Engine won’t crank.
CAUSE
1. 15 amp fuse blown.
CORRECTION
1. Replace fuse.
2. Loose, corroded or defective
battery cables
2. Tighten, clean or replace
as necessary.
3. Battery is discharged or defective.
4. Defective starter contactor.
5. Defective starter motor.
3. Recharge or replace battery.
4. Replace if defective.
5
Replace if defective.
6. Defective Controller circuit board
6. Replace if defective.
Engine cranks but won't start
1. Out of fuel
1. Replenish fuel.
2. Fuel shutoff valve is closed.
3. Defective Controller circuit board
4. Spark plug defective.
5. Defective ignition coil on engine
6. Defective carburetor
2. Open fuel shutoff valve.
3. Replace if defective.
4. Clean, regap or replace plug.
5. Replace if defective.
6. Replace if defective.
7. Dirty air cleaner.
7. Clean or replace elements as
needed.
8. Fuel solenoid is defective.
1. Dirty air cleaner.
8. Replace or repair.
Engine starts hard, runs rough.
1. Clean or replace elements as
needed.
2. Defective spark plug.
3. Defective ignition coil.
2. Clean, regap or replace plug.
3. Replace if defective.
Engine starts, shuts down when
Start/Stop switch is released.
1. Engine oil level is low.
2. Engine is overheated.
3. Defective Low Oil Pressure Switch
4. Defective Controller circuit board.
1. Check oil and add oil as needed.
2. Check cooling system for blockage.
3. Replace defective switch.
4. Replace defective board.
No AC output from generator.
1. Check main line circuit breaker.
1. Reset to ON or CLOSED.
2. Reset transfer switch.
2. Transfer switch (if so equipped) is set
to wrong position.
3. Failure in vehicle electrical system.
4. Generator component failure.
3. See vehicle manual.
4. Contact an authorized service
facility.
R e c r e a t i o n a l V e h i c l e G e n e r a t o r
17
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Generac NP-50LPG Recreational Vehicle Generator
ELECTRICAL DATA
Drawing No. 94210
R e c r e a t i o n a l V e h i c l e G e n e r a t o r
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Generac NP-50LPG Recreational Vehicle Generator
ELECTRICAL DATA
Drawing No. 94210
R e c r e a t i o n a l V e h i c l e G e n e r a t o r
19
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Generac NP-50LPG Recreational Vehicle Generator
EXPLODED VIEW — BASE AND PULLEYS
Drawing No. 95865
R e c r e a t i o n a l V e h i c l e G e n e r a t o r
20
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Generac NP-50LPG Recreational Vehicle Generator
REPAIR PARTS — BASE AND PULLEYS
Drawing No. 95865
PART NO. QTY.
ITEM DESCRIPTION
PART NO. QTY.
ITEM DESCRIPTION
1
2
3
4
5
6
7
8
9
BASE, MOUNTING
GROUND CABLE
MOUNT, (RUBBER)
92603
90141
46911
1
1
4
8
10
4
2
2
2
6
2
2
2
4
2
1
1
2
1
1
1
1
1
1
1
1
1
2
1
1
1
1
4
1
36
41
42
43
44
45
46
47
48
49
50
51
52
53
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
ADAPTOR, UNIVERSAL EXH. 91146
CLAMP, EXH. PIPE-1-1/4 DIA. 96289
HHCS&LOCKWASH.-M6-1.0 x16. 79246
1
1
8
CAPSCREW, .-3/8"-16 x 1/2" 25017
GASKET, EXH. PIPE
FOAM TAPE
LUG, GROUNDING
WASHER, SPRING RETAINER
COVER, AIR OPENING
77643
29289
62684
75237
75226
2
LOCKWASHER-M10
LOCKWASHER-M8
SKID, RUBBER MOUNT
SAFETY BOLT 5/16"-18 x 3 1/2" 77603
NUT, HEX-5/16-18 22259
NUT, FLANGED LOCK-M8-1.25 52858
CAPSCR. -M8-1.25 x 60MM 51730
SPRING, BELT TENSION
WASHER, SPRING CNTR.
SLIDE (NYLON)
SUPPORT, NYLON SLIDE
MANIFOLD, EXHAUST
GASKET, EXHAUST MANIFOLD 90239
CAPSCR.,-M8-1.25 x 65 LG. 57636
GASKET, COLLECTOR PAN 92645
COVER PLATE -EXTERNAL 90859
PULLEY, ENGINE
PULLEY, ALT.
BELT (POLY V 4L)-40"
WASHER, PULLEY RETAINER 49451
CAPSCR., HEX HD. 3/8"-24 x 1" 42633
GUIDE, BLOWER HOUSING 77017
CAPSCR., 3/8"-24 x 2-1/2" 73118
SCREW (TAPTITE)-M6-1.00 x 20 74906
HOUSING, BLOWER
SPACER, BLOWER HOUSING 73185
LOCKWASHER, M5 22152
46526
22129
72391
10FT.
1
4
1
12
1
1
4
1
2
2
1
9
5
1
1
1
1
1
1
1
1
3
1
2
4
4
1
A/R
2
SCREW(CRIMPTITE) #10-24 x .5 56893
GASKET, FOAM-SLIDE PAN 75229
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
30
31
32
33
34
35
PAN, SLIDE
FLAT WASHER-M6
75227
22473
29459
75215
73146
75209
91032
COVER, EXHAUST OUTLET 72384-C
LOCK WASHER, SHAKEPR.-M6 22447
NUT, FLANGE-5/16-18 (SPECIAL) 81105
DECAL, GROUND
67210A
SCREW, TAPTITE M5-0.8 x 10 . 74908
SCREW, TAPTITE M6-1.0 x 10 45756
FLAT WASHER-M10
22131
REGULATOR MOUNT .BRACK. 78864
75224-B
73106-B
75216
REGULATOR
FUEL SOLENOID 12VDC
45° STREET ELBOW-3/4"
75211
A2666
25425
STRAIGHT BARB. FIT.-1/2 x 3/8" 63463
HOSE CLAMP-SIZE-#8 57822
FUEL HOSE-1/2" DIA. x 8.50" 74994
90 °STREET ELBOW-3/4"
PIPE, NIPPLE-3/4" x 3" LG
M6-1.0 x 30 CAP SCREW
M6 LOCK WASHER
M6 HEX NUT
FLEX SLEEV.-3/8" x 9" Lg.
PIPE JOINT COMPOUND
26307
26881
38750
22097
49813
84409
55162
72375
CAPSCR. -M5-0.80 x 80MM 77682
SPRING, GENERATOR SET MT 75242
COVER PLATE, EXH. BASE 92203
M6 x 16 HEX HD. CAPSCR. 47411
R e c r e a t i o n a l V e h i c l e G e n e r a t o r
21
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Generac NP-50LPG Recreational Vehicle Generator
EXPLODED VIEW — ALTERNATOR AND PANEL
Drawing No. 94106
R e c r e a t i o n a l V e h i c l e G e n e r a t o r
22
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Generac NP-50LPG Recreational Vehicle Generator
REPAIR PARTS — ALTERNATOR AND PANEL
Drawing No. 94106
PART NO. QTY.
ITEM DESCRIPTION
PART NO. QTY.
ITEM DESCRIPTION
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
Lower Bearing Carrier
50 Rotor Assembly
50 Stator Assembly
Ball Bearing
Ball Bearing
Upper Bearing Carrier
Stator Stud
M8-1.25 Flange Lock Nut
Brush Holder
M5-0.8 x 16 Taptite
Nylon Washer
Generator Top Housing
Resistor
M6 Flat Washer
M6 Lock Washer
M6-1.0 x 60 Capscrew
Ground Cable
Shakeproof Lock Washer
M6-1.0 x 20 Taptite
P.C.B. Controller
Starter Cable
5/16 Lock Washer
5/16-18 Hex Nut
Panel Sheet Metal
4-Pin Connector
Connector
Remote Harness
M6-1.0 x 12mm Capscrew 66476
w/Lock Washer
Starter Contactor
M4-0.7 x 16 Capscrew
M4 Lock Washer
75995
92605G
92604G
73159
31971
72379
77006
52858
66386
66849
27756
86314
75234
22473
22097
74095
90141
22447
74906
94039
10-74260
22129
22259
86316
53650
91915
75244
1
1
1
1
1
1
4
8
1
2
4
1
1
3
5
1
2
1
4
1
1
2
2
1
1
1
1
2
35
36
37
38
39
41
42
43
44
45
46
47
48
49
50
M5-0.8 x 30 Capscrew
Vibration Mount
M6-1.0 Hex Nut
M5-0.8 x 16 Capscrew
M3 Lock Washer
2.5A.-ON Circuit Breaker
M5 Shakeproof Washer
Regulator Voltage
M5 Lock Washer
M5-0.8 Hex Nut
20A. Circuit Breaker
30A All Units Cir. Breaker
#6-32 w/Lockwasher Screw 25105
Panel Cover 86315
M4-0.7 x 16 Screw w/Lock 90734
Washer & Flat Washer
75235
82737
49813
55440
43182
53623
22769
83049
22152
51716
90144
90145
3
4
4
1
2
1
2
1
6
4
1
1
4
1
4
51
52
53
54
M4 Flat Washer
Fuse Holder
15A. AGC Fuse
6A (Start/Stop) S.P.D.T.
Switch
22985
32300
22676
87798
1
1
1
1
55
56
57
58
59
60
61
62
63
64
65
66
67
68
S.P.D.T. Switch (Fuel Pump) 92113
Terminal Block
1
1
1
1
1
1
1
1
1
2
1
1
1
1
75210A
23365
51715
90157
90156
89438A
31791
23365
74908
23484S
75763A
94070
94071
M4 Shakeproof Washer
M4-0.7 Hex Nut
30A. CB Rating Decal
20A. CB Rating Decal
Cust. Connection Decal
Hose Clamp
M5 Flat Washer
M5 x 10 Taptite
Bushing
29
30
31
32
33
34
86729
75476
22264
65795
90987
86317
1
3
4
1
2
1
Battery Charge Rectifier
M3-0.5 x 15 Capscrew
Panel Support Bracket
Battery Cable Boot
Plastic Spacer
M6-0.8 x 110 PPHMS.
R e c r e a t i o n a l V e h i c l e G e n e r a t o r
23
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Generac NP-50LPG Recreational Vehicle Generator
EXPLODED VIEW — ENGINE ENCLOSURE
Drawing No. 94108
R e c r e a t i o n a l V e h i c l e G e n e r a t o r
24
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Generac NP-50LPG Recreational Vehicle Generator
REPAIR PARTS — ENGINE ENCLOSURE
Drawing No. 94108
ITEM PART NO. QTY. DESCRIPTION
ITEM PART NO. QTY. DESCRIPTION
1
2
90953
45756
1
8
SCROLL, FLYWHEEL
SCREW, TAPTITE
M6-1.0 x 10 LG
SCREW, TAPTITE
M6-1.0 x 12 LG
FLYWHEEL (20 DEG.)
WASHER, BELLVILLE M20
NUT, M20 x 1.5
3/8” SPECIAL LOCK
WASHER
36
37
38
43790
47290
35461
1
1
1
ELBOW, 3/8 I.D. -BRASS
HOSE, 3/8 I.D.
BARB FITTING-1/4” NPT
3/8 HOSE
CAP-1/4” NPT
COVER-BASE, STARTER
SIDE
COVER-BASE, CARB. SIDE
WRAPPER, ENGINE
SPARK PLUG
3
90388
1
39
40
69811
90951
1
1
4
5
6
7
91222-A
67198-N
67890
1
1
1
1
41
42
90952
91137
1
1
A4456
8
9
56893
98769
23 SCREW, CRIMPTITE
#10-24 x .5 LG
43
44
90954
90955
1
1
WRAPPER, STARTER SIDE
WRAPPER, REAR GEAR
CASE
WRAPPER, CARB. SIDE
ASSEMBLY., WIRE
STARTER(#16)
SUPPORT, OIL FILTER
BUSHING, RUBBER
WASHER, RUBBER
BOLT, SHOULDER
M6 x 15 LG
BOLT, SOCKET HD.
CAPSCR.-M8-1.25 x 30 LG
GASKET, OIL FILTER
SUPPORT
1
COVER,TOP FLYWHEEL
NP50
45
46
90956
74260-10
1
1
11
12
13
91646
92572
92079
1
1
2
DEFLCT., EXHAUST PORT
ASSY., IGNITION COIL
SCREW, TAPTITE
47
48
49
50
90892
91159
91160
91161
1
1
1
1
M6-1.0 x 25MM
14
15
16
22717-A
73132
91643
1
1
1
GROMMET, RUBBER
BOOT, SPARK PLUG
BRACKET, INTAKE
MANIFOLD SUPPORT
GROMMET, RUBBER
LOCK WASHER-M8
CAPSCR., HEX HD.
M8-1.25 x 16 LG
51
52
53
49821
86999
60108
2
1
1
17
18
19
22717-B
22129
42907
1
8
2
SWITCH, OIL PRESSURE
10 PSI
20
21
57821
59637
2
2
CAPSCR., HEX HD.
M8-1.25 x 40 LG
SCREW, TAPTITE
54
55
75281
74027
1
2
SWITCH, OIL TEMP.
SCREW, PHILIPS PAN HD.
MACH.-M3-.05 x 5 LG
LOCK WASHER-M3
FILTER, OIL
ENGINE, LONG BLOCK
GN360RV
ENGINE, LONG BLOCK
GN410VSRV
KEY, WOODRUFF
4 x 19 DIA.
CLIP, HOSE RETAINER
SCREW, TAPTITE
M5-0.8 x 10 LG
3/8-16 x .75 LG
23
26
21544
40976
1
2
MOTOR, STARTER-12VOLT
SOCKET HD. CAPSCR.,
M8-1.25 x 20 LG
56
57
58
43182
70185
90783-A
2
1
1
28
29
30
31
32
33
34
35
25034
35467
27738-A
22145
55934-T
91519
91520
91648
1
1
1
2
1
1
1
1
PLUG, BUTTON-1.06
CLOSE NIPPLE 3/8 NPT
PIPE TEE 3/8” NPT
FLAT WASHER
CLAMP-VINYL COATED
TUBE-DIPSTICK
ASSY., CAP AND DIPSTICK
<169>O<170> RING DIA.
14 x 3 WALL
99673
82774
1
1
59
60
61
65852
74908
1
1
62
48031E
2
HOSE CLAMP
R e c r e a t i o n a l V e h i c l e G e n e r a t o r
25
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Generac NP-50LPG Recreational Vehicle Generator
EXPLODED VIEW — GN-410 ENGINE
Drawing No. B2195
R e c r e a t i o n a l V e h i c l e G e n e r a t o r
26
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Generac NP-50LPG Recreational Vehicle Generator
REPAIR PARTS — GN-410 ENGINE
Drawing No. B2195
ITEM PART NO. QTY.
DESCRIPTION
ITEM PART NO. QTY.
DESCRIPTION
1
2
3
71977
71979
72637
1
2
1
PISTON RING SET
33
34
35
76365
78645
78691
1
1
1
GOVERNOR SPOOL
CONNECTING ROD BOLT
CONNECTING ROD WITH CAP
AND BOLT
GOVERNOR RETAINER (C-RING)
OIL PRESSURE SPRING
RETAINER
4
5
71980
71983
73142
73144
73149
76339
76701
78698
80308
80309
80338
20527
1
2
1
8
4
1
1
2
2
1
1
1
PISTON PIN
36
74908
1
M5-0.80 x 8MM SCREW (THD.
FORMING)
PISTON PIN RETAINER
CYLINDER HEAD GASKET
FLANGED HEX HD. CAPSCREW
M10 x 100MM HEAD BOLT
PISTON
6
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
57
58
83912
83918
72662
83961A
72654
78658
78659
78699B
78699C
83948
87710
89288A
84430
86002
86026
88396B
90416
90747
71987
92362
92287
1
1
1
1
1
1
2
1
2
1
1
1
1
1
1
2
1
1
1
1
4
GOVERNOR GEAR ASSEMBLY
OIL PRESSURE SPRING
GOVERNOR SHAFT
7
8
9
OIL SUMP
10
11
12
13
14
15
CRANKCASE GASKET
M6 SCREW (THD. FORMING)
BREATHER GASKET
BREATHER COVER
OIL BREATHER SEPARATOR
DECAL, ENGINE
SLEEVE BEARING
GOVERNOR ARM “R” PIN
THRUST WASHER
SLEEVE DOWEL PIN DIA. 12
SLEEVE DOWEL PIN DIA. 14
GOVERNOR ARM
IDENTIFICATION
DOWEL PIN DIA. 12 x 20 LONG
CRANKCASE SUB ASSEMBLY
BALANCER
16
17
18
19
20
21
22
83897
72694
72696
78672
78694
83907
83923
2
2
2
1
1
2
1
TAPPET
PIVOT BALL STUD
JAM NUT (ROCKER ARM)
SEAL, VALVE STEM
PUSH ROD GUIDE PLATE
ROCKER ARM
OUTER GEROTOR
INNER GEROTOR
PUSH ROD
CRANKSHAFT ASSEMBLY
BREATHER VALVE ASSEMBLY
ROCKER COVER GASKET
ROCKER COVER W/FILL
M6-1.00 x 16MM PAN HD. SCR.
AND LOCKWASHER
CYLINDER HD. W/VALVE SEATS
AND GUIDES
23
24
25
26
27
28
29
30
31
32
86514
86515
86516
86517
89673
91308
83932
72655
76361
76362
2
4
1
1
2
2
1
2
1
1
VALVE SPRING RETAINER
VALVE SPRING KEEPER
EXHAUST VALVE
INTAKE VALVE
59
60
61
63
64
65
83921
77158
80342
76329
86254
93064
1
1
2
1
1
1
BEARING TUBE SHAFT
OIL SCREEN PICKUP ASSEMBLY
“O” RING 14 I.D. x 2.4 THICK
OIL FILL PLUG
WASHER, VALVE SPRING
VALVE SPRING
CAMSHAFT ASSEMBLY
CRANKSHAFT SEAL
THRUST WASHER
“O” RING 17.8 I.D. x 2.4 THICK
OIL FILL CAP ASSEMBLY
PRESSURE RELIEF BALL
R e c r e a t i o n a l V e h i c l e G e n e r a t o r
27
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Generac NP-50LPG Recreational Vehicle Generator
EXPLODED VIEW — ENGINE ACCESSORIES
Drawing No. 95866
R e c r e a t i o n a l V e h i c l e G e n e r a t o r
28
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Generac NP-50LPG Recreational Vehicle Generator
REPAIR PARTS — ENGINE ACCESSORIES
Drawing No. 95866
ITEM PART NO. QTY. DESCRIPTION
ITEM PART NO. QTY. DESCRIPTION
1
2
3
90896
91039
68527
1
1
2
MANIFOLD, INTAKE
39
92164
1
ASSEMBLY, GOV. SPRING
ADJ. BRACKET
GASKET, MANIFOLD/HEAD
BOLT, HEX HD. CAPSCR. &
LOCK WASHER-M6-1.0 x 20
SPARK PLUG, CHAMPION
#RC12YC
GASKET, CARB./MANIFOLD
L/P CARBURETOR
GASKET, CARB./AIR FILTER
BASE, AIR FILTER
PLATE, CARB. SHIELD
SCREW, PLASTITE #8 x .37"
BOLT, HEX HD. CAPSCR., &
LOCK WASHER-M6 x 12 LG
BOLT, CARB. MOUNT 80 LG
FILTER, AIR
PRE-CLEANER, AIR FILTER
COVER, AIR FILTER
BOLT, AIR FILTER COVER
SNAP BUSHING
40
41
42
43
83512
83503
91916
83532
2
1
1
1
BOLT, TAPTITE M8 x 15 LG
NUT, LOCKING M5- 0.8
LEVER, GOVERNOR ARM
BOLT, HEX HD. WASHER
/LOCK WASHER-M6 x 30
NUT, M6 SPECIAL
SPRING, GOVERNOR
BELLCRANK, GOV. RODS
WASHER, FELT
BOLT, SHOULDER M6 x 15
ROD, LINKAGE GOV.
LEVER-BELLCRANK
ROD, LINKAGE BELLCRANK
-CARB.
SPRING, A/L GOV. LEVER-
BELLCRANK
BREATHER TUBE
M6 FLAT WASHER
M6 LOCK WASHER
SPRING WASHER
NYLON WASHER, .31 X .26
X .13
4
72347
1
5
6
7
8
9
89228
A2775A
90970
73108C
91204
59635
66476
1
1
1
1
1
2
2
44
45
46
47
48
49
86681
91638
91633
92586
91161
91636
1
1
1
2
1
1
10
11
12
13
14
15
16
17
18
92695
73111
81646
73104-B
78609
20139
91554
2
1
1
1
2
1
1
50
51
91637
91649
1
2
52
53
54
55
56
91645
22473
22097
A4009
A7029
1
4
2
1
1
DECAL, A/C DATA NP-50G
(360 ENGINE ONLY)
DECAL, A/C DATA NP-50G
(410 ENGINE ONLY)
91554B
1
R e c r e a t i o n a l V e h i c l e G e n e r a t o r
29
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CALIFORNIA EMISSION CONTROL WARRANTY STATEMENT
YOUR WARRANTY RIGHTS AND OBLIGATIONS
The California Air Resources Board ("CARB") and Generac Corporation are pleased to explain the Emission Control System War-
ranty on your new recreational vehicle generator engine. In California, new recreational vehicle generator must be designed,
built and equipped to meet the State's stringent anti-smog standards. Generac Corporation will warrant the emission control
system on your recreational vehicle generator for the periods of time listed below provided there has been no abuse, neglect,
unapproved modification, or improper maintenance of your recreational vehicle generator engine.
Your emission control system may include parts such as the carburetor, ignition system and exhaust system. Also included may
be the compression release system and other emission-related assemblies.
Where a warrantable condition exists, Generac Corporation will repair your recreational vehicle generator engine at no cost to
you for diagnosis, parts and labor.
MANUFACTURER'S EMISSION CONTROL SYSTEM WARRANTY COVERAGE:
Emissions control systems on 1995 and later model year recreational vehicle generator are warranted for two years as hereinafter
noted. If, during such warranty period, any emission-related part on your engine is defective in materials or workmanship, the
part will be repaired or replaced by Generac Corporation.
OWNER'S WARRANTY RESPONSIBILITIES:
As the recreational vehicle generator engine owner, you are responsible for the performance of the required maintenance listed
in your owners manual. Generac Corporation recommends that you retain all receipts covering maintenance on your recreational
vehicle generator engine, but Generac Corporation will not deny warranty solely due to the lack of receipts or for your failure
to provide written evidence of the performance of all scheduled maintenance.
As the recreational vehicle generator engine owner, you should, however, be aware that Generac Corporation may deny you
warranty coverage if your recreational vehicle generator engine or a part thereof has failed due to abuse, neglect , improper
maintenance or unapproved modifications.
You are responsible for presenting your recreational vehicle generator engine to a Generac Corporation Authorized Service Outlet
as soon as a problem exists. The warranty repairs should be completed in a reasonable amount of time, not to exceed 30 days.
Warranty service can be arranged by contacting either a Generac Corporation Authorized Service Outlet or by contacting Gen-
erac Corporation at:
GENERAC CORPORATION PH: (414) 544-4811
P.O. BOX 8 FAX: (414) 544-0179
WAUKESHA, WI 53187
IMPORTANT NOTE: This warranty statement explains your rights and obligations under the Emission Control System Warranty
("ECS Warranty") which is provided to you by Generac Corporation pursuant to California law. See also the Generac Corpora-
tion Limited Warranties for Generac Corporation which is enclosed herewith on a separate sheet and also is provided to you by
Generac Corporation. The ECS Warranty applies only to the emission control system of your new engine. To the extent that there
is any conflict in terms between the ECS Warranty and the Generac Corporation Warranty, the ECS Warranty shall apply except
in any circumstances in which the Generac Corporation Warranty may provide a longer warranty period. Both the ECS War-
ranty and the Generac Corporation Warranty describe important rights and obligations with respect to your new engine.
Warranty service can only be performed by a Generac Corporation Authorized Service Outlet. At the time of requesting war-
ranty service, evidence must be presented of the date of the sale to the original purchaser. The purchaser shall pay any charges
for making service calls and/or for transporting the products to and from the place where the inspection and/or warranty work
is performed. The purchaser shall be responsible for any damage or loss incurred in connection with the transportation of any
engine or any part(s) thereof submitted for inspection and/or warranty work.
IF YOU HAVE ANY QUESTIONS REGARDING YOUR WARRANTY RIGHTS AND RESPONSIBILITIES, YOU SHOULD CONTACT GEN-
ERAC CORPORATION AT 1-800-222-3136
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EMISSION CONTROL SYSTEM WARRANTY
Emission Control System Warranty ("ECS Warranty") for 1995 and Later Model Year recreational vehicle generator:
A.Applicability: This warranty shall apply to 1995 and later model year recreational vehicle generator. The ECS Warranty Period
("ECS Warranty Period") shall begin on the date the new engine or equipment is delivered to its original, end-use purchaser
and shall begin on the date the new engine or equipment is delivered to its original, end-use purchaser and shall continue for
24 consecutive months thereafter.
B. General Emissions Warranty Coverage: Generac Corporation warrants to the original, end-use purchaser of the new engine or
equipment and to each subsequent purchaser that each of its recreational vehicle generator is:
1. Designed, built and equipped so as to conform with all applicable regulations adopted by the Air Resources Board pursuant
to its authority, and
2. Free from defects in materials and workmanship which, at any time during the ECS Warranty Period, will cause a warranted
emissions - related part to fail to be identical in all material respects to the part as described in the engine manufacturer's
application for certification.
C. The ECS Warranty only pertains to emissions-related parts on your engine, as follows:
1. Any warranted, emissions-related parts which are not scheduled for replacement as required maintenance in the Owner's
Manual shall be warranted for the ECS Warranty Period. If any such part fails during the ECS Warranty Period, it shall be
repaired or replaced by Generac Corporation according to Subsection (4) below. Any such part repaired or replaced under
the ECS Warranty shall be warranted for any remainder of the ECS Warranty Period.
2. Any warranted, emissions-related part which is scheduled only for regular inspection as specified in the Owner's Manual shall
be warranted for the ECS Warranty Period. A statement in such written instructions to the effect of "repair or replace as nec-
essary" shall not reduce the ECS Warranty Period. Any such part repaired or replaced under the ECS Warranty shall be warranted
for any remainder of the ECS Warranty Period.
3. Any warranted, emissions-related part which is scheduled for replacement as required maintenance in the Owner's Manual
shall be warranted for the period of time prior to first scheduled replacement point for that part. If the part fails prior to
the first scheduled replacement, the part shall be repaired or replaced by Generac Corporation according to Subsection (4)
below. Any such emissions-related part repaired or replaced under the ECS Warranty shall be warranted for the remainder
of the ECS Warranty Period prior to the first scheduled replacement point for such emissions-related part.
4. Repair or Replacement of any warranted, emissions-related part under this ECS Warranty shall be performed at no charge
to the owner at a Generac Corporation Authorized Service Outlet.
5. The owner shall not be charged for diagnostic labor which leads to the determination that a part covered by the ECS War-
ranty is in fact defective, provided that such diagnostic work is performed at a Generac Corporation Authorized Service Outlet.
6. Generac Corporation shall be liable for damages to other original engine components or approved modifications proximately
caused by a failure under warranty of any emission-related part covered by the ECS Warranty.
7. Throughout the ECS Warranty Period, Generac shall maintain a supply of warranted emission-related parts sufficient to meet
the expected demand for such emission-related parts.
8. Any Generac Corporation authorized and approved emission-related replacement part may be used in the performance of
any ECS warranty maintenance or repairs and will be provided without charge to the owner. Such use shall not reduce Gen-
erac Corporation ECS warranty obligations.
9. Unapproved add-on modified parts may not be used to modify or repair a Generac Corporation engine. Such use voids this
ECS Warranty and shall be sufficient grounds for disallowing an ECS Warranty claim. Generac Corporation shall not be liable
hereunder for failures of any warranted parts of a Generac Corporation engine caused by the use of such an unapproved
add-on or modified part.
EMISSION RELATED PARTS INCLUDE THE FOLLOWING:
1. Fuel Metering System
2. Air cleaner assembly
a. Air filter element
b. Intake pipe
a. Gasoline carburetor assembly (if so equipped)
1)
2)
3)
Fuel Filter (if so equipped)
Carburetor gaskets
Fuel pump
3. Ignition system including:
a. Spark plug
b. LP/Natural gas carburetion assembly
b. Ignition module
1)
2)
3)
4)
5)
Fuel controller
4. Catalytic muffler (if so equipped)
a. Muffler gasket (if so equipped)
b. Exhaust manifold (if so equipped)
Mixer and its gaskets (if so equipped)
Carburetor and its gaskets (if so equipped)
Primary gas regulator (if so equipped)
LP liquid vaporized (if so equipped)
5. Crankcase breather assembly and its components.
a. Breather connection tube
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Generac NP-50LPG Recreational Vehicle Generator
Generac’s Three-Year Limited Warranty For Recreational Vehicle NP Generators
GENERAC warrants to the original purchaser that its generators will be free from defects in materials or workmanship for the
period set forth below from the date of original purchase. During said warranty period, Generac will, at its option, repair or replace
any part which, upon examination by Generac or Generac Authorized Distributors and/or Dealers, is found to be defective under
normal use and service.
This warranty is effective only upon Generac’s receipt prior to expiration of the warranty period of a completed Warranty Regis-
tration Card. This card is the only valid registration identification and must be presented at time of service. Claims will not be
accepted without presentation of Registration Card.
THREE YEAR WARRANTY SCHEDULE
1. All NP Series generators used in a recreational vehicle shall be warranted for a period of three (3) years or 2,000
hours of operation, whichever occurs first. All parts, labor, removal and reinstallation shall be covered for the first
two years. Parts and labor on selected generator and engine parts shall be covered during the third year or 2,000
hours, whichever occurs first. These selected parts are limited to: the main Rotor and Stator, Computer Control
board (if applicable) with regard to the generator; the Cylinder Block, Cylinder Head, Crankshaft, Piston, Valve,
Valve Lifter, and Manifolds with regard to the engine.
2. The drive train belt and pulleys (if so equipped) on NP air-cooled generator used in recreational vehicles shall be
warranted against failure due to defective materials or normal usage for the life of the generator. For the original
owner, this drive train warranty shall include parts and labor plus $50.00 payment upon return of the failed belt or
pulley by the original owner. For succeeding owners, this power train warranty shall cover belt or pulley parts only.
3. Rental units, demonstrators, prime power, or commercial applications, such as construction or utility, are warranted
for (1) one year or 2,000 hours, whichever comes first.
THIS WARRANTY DOES NOT COVER:
•
•
•
•
Costs of maintenance, installation, and start-up.
Failures due to (a) normal wear and tear from GN engine, or (b) accident, misuse, abuse, negligence or improper installation.
Products which are modified or altered in a manner not authorized by Generac in writing.
Any incidental, consequential or indirect damages caused by defects in materials or workmanship, or any delay in repair or replace-
ment of defective parts.
•
•
•
•
•
•
•
Failure due to misapplication.
Telephone, telegraph, teletype or other communication expense.
Living or travel expenses of persons performing service.
Any and all transportation/travel expenses.
Rental equipment used while warranty repairs are being performed.
Overtime labor.
Starting batteries, fuses, light bulbs, and engine fluids.
**NORMAL WEAR: As with all mechanical devices, the GN-Series engines need periodic parts service and replacement
to perform well. This warranty will not cover repair when normal use has exhausted the life of a part or an engine.
There is no other express warranty. Generac hereby disclaims any and all implied warranties, including but not limited to those
of merchantability and fitness for a particular purpose to the extent permitted by law. The duration of any implied warranties which
cannot be disclaimed is limited to the time period (one year) as specified in the express warranty. Liability for consequential, inci-
dental or special damages under any and all warranties is excluded to the extent permitted by law. Some states do not allow
limitations on how long an implied warranty lasts, or the exclusion or limitation of incidental or consequential damages, so the
above limitations or exclusions may not apply to you. This warranty gives you specific legal rights and you may also have other
rights, which vary from state to state.
For service, see your nearest GENERAC authorized warranty service facility or call 1-800-333-1322. Warranty service can be
performed only by a GENERAC authorized service facility. This warranty will not apply to service at any other facility. At the time
of requesting warranty service, evidence of original purchase date must be presented.
Generac Corporation
P.O. Box 8
Waukesha, WI 53187
Telephone: (414) 544-4811
Fax: (414) 544-4851
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