WARNING
DO NOT ATTEMPT TO OPERATE THIS MACHINE UNTIL YOU HAVE READ AND
UNDERSTOOD ALL SAFETY PRECAUTIONS AND OPERATING INSTRUCTIONS.
EQUIPMENT AND CHEMICALS WHEN USED IMPROPERLY CAN BE DANGEROUS.
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UNIT LAYOUT
Hydraulic
Motor
Pump
Wet Cup
Pressure
Gauge
Filter
Manifold
Prime/Drain
Hose
Prime/Drain
Valve
Suction
Hose
Pump Outlet
Spray Hose Hook Up
Drive Belt
Hydraulic Pump
& Pressure Control
Hydraulic Pump
Shut Off Valve
Hydraulic Fluid
Fill & Vent
Hydraulic Fluid
Level Gauge
Paint Piston
Pump
Suction Tube &
Suction Filter
HRO-ST3131
Page 3
Mar 8, 2004
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SAFETY WARNING!
• Use of this high-pressure equipment could result in serious injury and is for
professional use only!
• You must operate this equipment only after the instruction manual is clearly understood.
• Workman and assistant must always wear protective eyewear, gloves, clothing,
and respirators as recommended by the material manufacturer.
GAS / HYDRAULIC POWERED AIRLESS
SPRAY PUMPS.
SPRAY GUN SAFETY WARNING
• Never point the gun at yourself or anyone
else: This can result in serious injury.
• Safety latch: Engage trigger safety latch in
the closed or “LOCK” Position see FIG 1,
whenever you stop spraying, even for a mo-
ment. Failure to engage trigger safety latch
can result in serious injury.
• Trigger safety guard: This prevents the
gun from triggering accidentally when it is
dropped or bumped. You must not operate
without the trigger safety guard.
Gas / Hydraulic powered airless spray equipment is an
industrial paint sprayer which uses a gas engine to drive a
hydraulic pump which in turns produces hydraulic pres-
sure. This pump delivers pressure fluid to a hydraulic mo-
tor which drives a high pressure airless piston pump. All
of these components make this unit a heavy duty portable
airless sprayer which is capable of high volume and high
production able to pump and spray light to very high vis-
cous materials. Airless spray is fast, economical and
needs no atomizing air.
• When cleaning or changing the tips use ex-
treme caution and follow the “PRESSURE
RELIEF PROCEDURE” then remove the
spray tip.
• Aim the spray gun into a grounded metal
pail using the lowest pressure possible,
then trigger the spray gun.
• If the fluid sprayed is not diffused into a
irregular stream, replace the diffuser at once.
• If the spray tip clogs while spraying, engage
trigger safety latch in “SAFE” position
immediately.
Airless spray systems use a high pressure pump
to supply fluid to the spray tip, where it is atomized
by the pressure and sprayed onto a desired surface.
Control of the atomizing pressure is done by regulating
the hydraulic fluid pressure in the hydraulic pump.
The spray is controlled by triggering a hand gun,
or activating the controls of an automated system.
The spray pattern and flow rate is controlled by
choosing the spray tip best suited to your needs.
GENERAL SAFETY WARNING
• Never wipe off around the spray tip until
pressure is fully relieved and the trigger
safety latch in “SAFE” position.
•
•
High pressure spray can cause serious injury.
Because of the high pressure and velocity of the fluid
being atomized, paint, solvent or other fluids could
penetrate through your skin, into your body or eyes.
Never point the spray gun at yourself or anyone else.
Never put your hands, fingers or any part of the
body over the spray tip/nozzle.
Fig 1
•
•
•
Even after you shut off the pump, there is still high
pressure in the system, You must always follow the
“PRESSURE RELIEF PROCEDURE” before ser-
vicing, or removal of the spray tip/nozzle.
Trigger safety lock
Push up to engage
lock
HRO-ST3131
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EQUIPMENT PRESSURE
PRESSURE RELIEF PROCEDURE
Always follow “PRESSURE RELIEF PROCEDURE’’
before servicing, cleaning or removal of the spray tip to
prevent serious bodily injury, fluid injection, or splashing
in the eyes.
The HRO ST-3131 pump can develop 3500
P.S.I. (225 Bar) maximum working pressure at
Never exceed this maximum pressure to the pump.
Exceeding the maximum working pressure can
result in serious equipment damage or rupture.
1 Engage the spray guns safety latch in “LOCK” position
2 Shut off the power to the gas engine.
FIRE OR EXPLOSION WARNING
3 Disengage the spray gun safety latch and aim the spray
gun into the side of grounded metal pail, and trigger the
gun to relieve pressure.
1 Re engage the spray gun safety latch in “LOCK”
position.
2 Open the drain valve to release pressure. Leave drain
valve in open position during all service operations.
3 Leave drain valve open until you are ready to spray
again.
The flow of fluid through the inside of pump
and hose can give occasion to static electricity
by the high velocity, so be sure to ground
every part of the spray equipment properly.
Sparking can ignite fumes from solvents and
fluid being sprayed, dust particles and other
flammable substances, whether you are spraying
indoors or outdoors, It can result in serious
bodily injury or property damage.
If you feel that the spray tip or hose is completely clogged
or pressure has not been fully relieved after following the
steps above, remove the tip retaining nut and release
pressure gradually.
Never plug in or unplug any power supply cords
in the spray area where there is any chance of
igniting fumes still in the air.
If you experience any static sparking or even a
slight shock while using this equipment, stop
spraying immediately and check the entire
system for the grounding situation.
Do not use again until the problems have been
identified and corrected.
HOSE SAFETY
Because of the high pressure in the hoses, if the hose
develops a leak, rupture, or other damage, High pressure
fluid could penetrate the skin, causing serious bodily injury.
•
Never use damaged hoses. Before using check the en-
tire hose for cuts, leaks, abrasion, or a bulging cover. If
any type of damage is noticed, replace the hose immedi-
ately.
EQUIPMENT ALTERATION WARNING
Never alter any part of spray equipment or
other accessories. Altered or modified. such as
over-pressurizing, modifying parts, using
incompatible chemicals and fluids including
worn or damaged parts can result in malfunction
causing serious bodily injury, fire, explosion or
property damage. Always check all spray
equipment regularly and repair or replace
worn or damaged parts without delay.
Workman and assistant must always wear
protective eyewear, gloves, clothing, and
respirator as recommended by the material
manufacturer.
•
•
•
•
Spring guard : Hoses must have spring guard on both
ends where easy to damage or wear than other parts.
Tighten all fluid connections securely before use. High
pressure fluid can dislodge a loose coupling.
Do not pull on hoses to move, only lift the hoses up to
move them.
Do not exceed the hoses to temperatures above 180 de-
grees F. (82 degrees C.) or below –40 degrees F. (-40
degrees C.)
•
•
Before using be sure to check a tag on it which speci-
fies the maximum electrical resistance and
exceed the recommended limits.
do not
Ungrounded or poorly grounded hose can give way
to serious system hazards or fire/explosion hazard.
HRO-ST3131
Page 5
Mar 8, 2004
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•
•
Filter manifold - Removes and filters out the impu-
rities from the paint before reaching the spray tip.
Prime valve - Releases fluid pressure from the
pump, hoses and guns. Turn counter clockwise to
open and clockwise to close.
GROUNDING SAFETY
Check your local electrical code for detailed grounding
instructions for your area and type of equipment and be
sure to ground all of this spray equipment as the
following.
•
Spray Gun Make sure that gun is in good operating
condition.
1
Pump : Use a ground wire and ground to a good
source such as the building ground source, or drive
a steel spike into the ground and attach the ground
wire to it.
Fluid hoses : Use only grounded hoses to a maxi-
mum of 500 FT (150M)
Spray Gun : Connect to a properly grounded fluid
hose and pump.
Object being sprayed & Fluid supply tank : All
sources should be grounded.
AIRLESS – SPRAY TECHNIQUE
Good airless-spray technique is much like conventional
air spray, except that you hold the gun further from
work surface, you get more coating thickness, which
results in less pattern overlapping, and you use more
positive action when triggering gun.
2
3
5
6
Hold the gun 10-12 in from the work, the distance
varies with the covering ability of the paint, type of
surface to be sprayed, and the spray pattern.
Solvent pail : Use only metal pails not plastic or
use the pail on a non conductive surface, such as
card board or plastic sheeting .
MOVING PARTS SAFETY WARNING
•
•
Moving parts can cause to pinch or seriously
injure your fingers or other body parts.
Keep clear of moving parts when starting
or operating the pump and be sure to follow
the “Pressure Relief Procedure” to prevent
the pump starting accidentally.
INSTALLATION
PREPARING PAINT FOR USE.
If you have any trouble installing, contact
Hero technical service for support or assistance.
1-800-494-4376
These are probably the most important steps
toward trouble-free spray painting.
Prepare the paint or other coatings according to the
manufacturer’s instructions.
If the paint has been opened before, the product
should checked to make certain that it has not
skinned over .
Stir paint thoroughly to dissolve hard pigments.
Strain the paint through a fine nylon mesh bag
(available at most paint dealers) to remove
particles that may clog filters, or spray tip.
Follow the paint manufacturer’s recommendation
on thinning the material to be sprayed.
Be careful not to add too much solvent, over
thinning paint makes the coating hard to control
and reduces its coverage .
•
•
•
Install the correct spray hose and spray tips to suit
the type of application.
All fluid hoses must be properly sized and pressure
rated for this equipment.
•
•
•
•
•
Use only grounded fluid hoses.
Pressure regulator - This controls pump pres sure
and outlet pressure by adjusting the adjustment
knob to the pump.
Hydraulic shut off valve - This lever type valve
shuts off fluid pressure from hydraulic pump.
Suction tube filter - Removes harmful and course
materials from entering pump.
•
•
•
•
HRO-ST3131
Page 6
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OPERATION
WARNING
Follow the “Pressure Relief Procedure” before operating.
If there are leaks, shut off the pump immediately
and release system pressure. Follow the “Pressure
Relief Procedure” then tighten connections, start
the pump again and check to be sure leaking has
stopped.
FLUSHING TO CLEAN SYSTEM
Flush the pump, hose and gun with the solvent as
Recommended by your material supplier.
Always use the lowest pressure necessary to get
the desired results, Higher pressures waste fluid
and cause premature wear of the pump
packings and spray tips.
FLUSH THE PUMP BEFORE STARTING
1 Make sure that engine is shut off.
WARNING : DO NOT INSTALL THE SPRAY TIP .
Never allow the pump to run dry of the fluid
being pumped, because a dry pump will quickly
accelerate to a high speed, possibly damage itself.
If the pump accelerates quickly or is running too
fast, shut off pump immediately and check the
fluid supply.
2 Connect a suction hose to the pump’s fluid inlet or put
in a metal pail containing a gallon of compatible sol-
vents.
3 Close the drain valve.
4 Hold a metal part of the spray gun firmly against the side
of a grounded metal pail and hold the trigger open.
5 Turn the switch to the on position and start.
6 Very slowly turn the pressure regulator clockwise until
the pump starts about 100 P.S.I.
KEY POINTS BEFORE STARTING
TO SPRAY
7 Cycle the pump slowly until all air is pushed out, and
fluid is flowing in a steady stream.
1
2
3
Check the hydraulic fluid level in the tank
Check the engine oil level.
8 Release the spray gun trigger and engage the safety
latch in the “Lock” position and carefully
Check the grounding of the system to prevent
static sparking.
check all connections in the system for leaks.
9 Follow the “Pressure Relief Procedure” and then install
the spray tip in the gun.
4
5
Flush the system and test for leaks.
Lubricate the pump with Hero piston lubricant
part # 4-02-40-3PL1 in the wet cup.
6
Remove and check gun filter, if used, to
see that it is clean.
7
8
Closed the prime / drain valve.
Check the level of paint in the supply container
and see that the paint has been thoroughly mixed,
and if necessary, thinned.
9
Keep the pump, hose and gun clean inside and
outside.
HRO-ST3131
Page 7
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•
•
Use the lowest pressure setting possible.
WARNING
If the pump accelerates quickly or is running too
fast, stop the pump immediately and check the mate-
rial supply.
If there are leaks, shut off the pump immediately and
release system pressure follow the “Pressure Relief
Procedure” then tighten connections, start the pump
again and check to be sure leaking has stopped.
Always use the lowest air pressure necessary to get the
desired results, Higher pressures waste fluid and cause
premature wear of the pump packings and spray tips.
Never allow the pump to run dry of the fluid being
pumped because a dry pump will quickly accelerate to a
high speed, possibly damage itself.
•
•
Don’t leave a pump shut off for a long period of
time, if the material supply has been exhausted and
air has been pumped into the lines. This can cause
the
material possibly to dry in the lines.
Prime the pump and lines with material or flush and
leave filled with solvent, with the pressure relieved.
If the pump accelerates quickly or is running too fast,
shut off pump immediately and check the fluid supply.
MAINTENANCE
DAILY SHUTDOWN PROCEDURE”
•
•
Close the on-off air valve to the pump.
NOTE:
Always be sure to stop the pump at the bottom
of the stroke to prevent paint from drying on the
displacement rod and damaging the throat packings.
The pump will stall out (stop) against the
pressure without any damage to the pump.
•
Always bleed off the paint pressure in the system by
triggering the gun and opening the drain valve,
making sure to have a container ready to catch the
paint draining from the drain valve.
SETTING UP TO SPRAY
Always follow the “Pressure Relief Procedure” before
cleaning, or removing the equipment or servicing any
part of system equipment.
•
•
Remove the tip from the gun and clean and leave it
in solvent until ready to use again.
Do not disconnect the gun or hoses, keep the unit
filled with solvent to reduce the need for flushing.
•
Immerse the pump intake or suction tube in paint.
Make sure drain valve is open.
•
•
Start the engine.
NOTE:
Open the hydraulic ball valve to allow hydraulic
fluid to flow to hydraulic motor.
−When using fast drying paints, immerse the suction
•
•
•
Paint pump should start to pump material and you
should notice material flowing out to prime valve.
tube in a container of solvent during shutdown.
−Clean the pump’s intake screen.
Let the pump run until the material is flowing evenly
out of prime valve.
Close the prime valve and unit should now build up
with pressure.
SHUTDOWN FOR STORAGE
Always follow the “Pressure Clearance Procedure” and
when storing the unit proceed as follows:
• Flush the unit clean, as instructed . It may take re-
peated flushing with solvent or water, to clean the sys-
tem thoroughly.
•
Run the pump until paint flows smoothly from the
gun, without spitting, release the trigger.
•
Adjust the pump to the minimum pressure required
to obtain the desired spray pattern of paint. If
atomization is not possible on thick paints,
thin with the compatible solvent.
• Fill the pump, hoses, and gun full of solvent. If the
flushing solvent used as water or a keytone type
solvent, fill the system with mineral spirits or light oil
for storage over a long period. Wipe all external wet-
ted parts of the pump with oil. Make sure that water or
keytone solvent is removed from the wet cup/ packing
nut.
Page 8
Mar 8, 2004
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TROUBLE SHOOTING
TROUBLE
POSSIBLE CAUSE
REMEDY
1. Ball valve on the hydraulic shut
1. Turn ball valve to the on position.
off valve not opened to the on po- 2. Fill with correct fluid.
sition.
3. Slowly increase the pressure by
turning the regulator knob clockwise.
Pump will
2. Low or no hydraulic fluid
not stroke.
3. Pressure regulator not turned up to 4. Call technical service department.
high enough pressure. 5. Call technical service department.
4. Poor or damaged hydraulic pump 6. Follow “pressure relief instructions”
5. Damaged hydraulic motor
6. Paint pump at full pressure.
7. Paint pump seized.
7. Follow pressure relief procedures and
check the following; hardened paint in
pump.
1. Fault in pump section.
2. Worn spray tip.
1. Pump may need repair.
2. Replace tip.
Pump stokes,
but poor
performance.
3. Improper tip size.
4. Material too viscous ( thick ).
5. Gun filter and / or pump filter
plugged.
6. Engine may not be running
correctly.
3. Replace tip.
4. Thin material with appropriate thinners,
per product manufacturer’s instructions.
5. Clean or replace filter(s).
6. Check and choke and throttle positions.
7. Fluid section seized by dry paint. 7. Clean & rebuild fluid section. See 15-17
1. Air leaks or blockages.
1. Check the following;
⇒ Intake tube fitting.
⇒ Plugged intake screen.
⇒ Intake Teflon O-ring.
2. Re-pack pump.
Low or Erratic
Output /
Pressure
2. Worn Upper Packings, Intake or
Outgo balls and / or seats.
3. Cylinder sleeve leakage.
4. Worn spray tip.
3. Replace cylinder sleeve seal ( ref# 15).
4. Change tip.
.
HRO-ST3131
Page 9
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WARNING
•
•
Use the lowest pressure setting possible.
If the pump accelerates quickly or is running too
fast, stop the pump immediately and check the mate-
rial supply tank.
If there are leaks, shut off the pump immediately and
release system pressure follow the “Pressure Clearance
Procedure” then tighten connections, start the pump
again and check to be sure leaking has stopped.
Always use the lowest air pressure necessary to get the
desired results, higher pressure waste fluid and cause
premature wear of the pump packing and spray tip.
Never operate the pump to run dry of the fluid being
pumped because a dry pump will quickly accelerate to a
high speed, possibly damage itself.
•
•
Don’t leave a pump shut off if the material supply
has been exhausted and air has been pumped into the
lines.
Prime the pump and lines with material or flush and
leave filled with solvent, with pressure relieved.
If the pump accelerates quickly or running too fast, shut
off immediately and check the fluid supply.
MAINTENANCE
DAILY SHUTDOWN PROCEDURE
•
•
•
Shut off power to engine.
Close hydraulic ball valve.
NOTE:
The pump will stall out (stop) against pressure without
damage to the pump.
Always bleed off paint pressure in the system by
triggering the gun open and opening the drain valve
and have a container ready to catch the paint
draining from the drain valve.
SPRAY STARTING AND ADJUSTING
•
•
Remove the tip from the gun and clean and leave it
in solvent until ready to use again.
Always follow the “Pressure Relief Procedure” before
cleaning, , or, removing the equipment or servicing any
part of system equipment.
Do not disconnect the gun or hoses and keep the unit
filled with coating to reduce the need for flushing.
•
•
•
Immerse the pump intake or suction tube in paint.
Make sure drain valve is open.
NOTE:
Let the pump run until it is primed and run until
paint flows smoothly out of prime / drain valve.
−When using fast drying paints, immerse the suction tube
in a container of solvent during shutdown periods.
•
•
Close the prime
−Clean the pump’s intake screen.
Squeeze the gun trigger and open the on-off air valve
gradually at first to from the gun, without spitting,
release the trigger and open the pump runaway valve
fully.
SHUTDOWN FOR STORAGE
Always follow the “Pressure Clearance Procedure” and
when storing the unit : proceed as follows.
•
•
•
Tighten the tip retainer nut with moderate tension
only.
If pattern is not fully atomized, gradually increase
the pressure with the pump adjusting nut.
•
Flush the unit clean, as instructed above. Sometimes
it takes several flushings, each with solvent, to clean
thoroughly.
Adjust the pump to the minimum pressure required
to obtain the desired spray pattern of paint. If
atomization is not possible on thick paints,
thin with the compatible solvent.
Flush the pump, hoses, and gun with full of solvent
unless the flushing solvent is water or ketone solvent, to
remove water or ketone solvent, fill the system with min-
eral spirits solvent or light oil for long storage periods,
and wipe all external wetted parts with oil. Also remove
water or ketone solvent used, from exposed part of pump
displacement rod.
HRO-ST3131
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FLUSHING PROCEDURE
Follow the pressures relief procedure on page 3.
1.
2.
Remove and clean gun filter.
Unscrew filter housing retainer (ref# 1) (should be hand tight)
and remove and clean filter (ref# 5) thoroughly.
Re-install the filter housing and retainer. Flush sprayer without
filter screen installed.
3.
4.
5.
6.
7.
8.
Close prime valve.
Pour a gallon of the correct thinner into a clean 5 gallon pail.
Insert the intake tube into the pail.
Turn regulator control knob all the way counter-clockwise.
Point prime valve bleed tube into 5 gallon pail. Turn the pump
ball valve on and slowly increase the pressure until sprayer
starts. Open prime valve. Allow thinner to circulate
back into the pail for a short period to flush the prime valve.
Close the prime valve.
1
9.
10.
While firmly holding a metal part of the gun against a metal
waste container, trigger the gun into a separate waste container.
Keep the gun triggered until clean solvent is sprayed from the
gun. Release the trigger and engage the safety lock.
Remove the intake tube from the pail. Trigger the gun once
again to discharge thinner from the hose. Do not let the pump
run dry for more than a couple of minutes or damage to the
pump packing could result.
11.
12.
13.
14.
Unscrew filter housing retainer and re-install the filter screen.
Repeat steps 3-9 with clean solvent.
Turn the ball valve off, and open the prime valve.
5
NOTE: Filter housing retainer (ref# 1) only has to be hand tight.
NOTE: NEVER LEAVE THE UNIT UNDER PRESSURE
WHEN NOT SPRAYING ( MOTOR TURNED OFF ).
RELIEVE PRESSURE BY TRIGGERING GUN.
NOTE: TO PREVENT CORROSION AND TO REDUCE
THE RISK OF FLUID FREEZING IN THE PUMP.
NEVER STORE THE UNIT WITH PAINT OR
WATER IN THE PUMP SYSTEM, EVEN
OVERNIGHT!
HRO-ST3131
Page 11
Mar 8, 2004
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Manufactured by:
H.E.R.O. INDUSTRIES
2719 LAKE CITY WAY
BURNABY, B.C.
CANADA
Phone:
Fax:
604-420-6543
800-494-4376
604-420-8725
Purchased From
__________________________
__________________________
__________________________
__________________________
Model: __________________
Serial #: _________________
Date of Purchase:
HRO-ST3131
Page 12
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