Harbor Freight Tools Air Compressor 99925 User Manual

25 gallon, 3.5 hp air  
compressor  
99925  
set up and operating instructions  
®
distributed exclusively by harbor Freight tools .  
3491 Mission Oaks Blvd., Camarillo, CA 93011  
Visit our website at: http://www.harborfreight.com  
read this material before using this product.  
Failure to do so can result in serious injury.  
saVe this manual.  
©
®
Copyright 2008 by Harbor Freight Tools . All rights reserved. No portion of this manual or any artwork  
contained herein may be reproduced in any shape or form without the express written consent of  
Harbor Freight Tools. Diagrams within this manual may not be drawn proportionally. Due to continuing  
improvements, actual product may differ slightly from the product described herein. Tools required for  
assembly and service may not be included.  
For technical questions or replacement parts, please call 1-800-444-3353.  
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an increased risk of electric shock if  
your body is grounded.  
This enables better control of the tool  
in unexpected situations.  
c.do not expose tools to rain or wet  
conditions. Water entering a tool  
will increase the risk of electric shock.  
e.dress properly. do not wear loose  
clothing or jewelry. Keep your  
hair, clothing and gloves away  
from moving parts. Loose clothes,  
jewelry or long hair can be caught in  
moving parts.  
d.do not abuse the cord. never use  
the cord for carrying, pulling or  
unplugging the tool. Keep cord  
away from heat, oil, sharp edges or  
moving parts. Damaged or entan-  
gled cords increase the risk of electric  
shock.  
f. only use safety equipment that  
has been approved by an appropri-  
ate standards agency. Unapproved  
safety equipment may not provide  
adequate protection. Eye protection  
must be ANSI-approved and breath-  
ing protection must be NIOSH-ap-  
proved for the specific hazards in the  
work area.  
e.if operating a tool in a damp loca-  
tion is unavoidable, use a ground  
Fault circuit interrupter (gFci)  
protected supply. Use of a GFCI  
reduces the risk of electric shock.  
f. do not use an extension cord with 4. tool use and care  
this product.  
a.do not force the tool. use the  
correct tool for your application.  
The correct tool will do the job better  
and safer at the rate for which it was  
designed.  
3. personal safety  
a.stay alert, watch what you are do-  
ing and use common sense when  
operating this tool. do not use  
this tool while you are tired or un-  
der the influence of drugs, alcohol  
or medication. A moment of inatten-  
tion while operating tools may result  
in serious personal injury.  
b.do not use the tool if the switch  
does not turn it on and off. Any  
tool that cannot be controlled with  
the switch is dangerous and must be  
repaired.  
c.disconnect the plug from the  
power source of the tool before  
making any adjustments, changing  
accessories, or storing tools. Such  
preventive safety measures reduce  
the risk of starting the tool acciden-  
tally.  
b.use personal protective equip-  
ment. always wear eye protection.  
Safety equipment such as dust mask,  
non-skid safety shoes, hard hat, or  
hearing protection used for appropri-  
ate conditions will reduce personal  
injuries.  
d.store idle tools out of the reach of  
children and do not allow persons  
unfamiliar with the tool or these  
instructions to operate it. Tools are  
dangerous in the hands of untrained  
users.  
c.prevent unintentional starting.  
ensure the switch is in the off-po-  
sition before connecting to power  
source or moving the tool.  
d.do not overreach. Keep proper  
footing and balance at all times.  
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e.maintain tools. check for mis-  
alignment or binding of moving  
parts, breakage of parts and any  
other condition that may affect the  
tools operation. if damaged, have  
the tool repaired before use. Many  
accidents are caused by poorly main-  
tained tools.  
4. Do not use to supply breathing air.  
5. Do not direct air flow from the Com-  
pressor at people or animals.  
6. Industrial applications must follow  
OSHA requirements.  
7. Maintain labels and nameplates on  
the tool. These carry important safety  
information. If unreadable or miss-  
ing, contact Harbor Freight Tools for a  
replacement.  
f. use the tool in accordance with  
these instructions, taking into ac-  
count the working conditions and  
the work to be performed. Use of  
the tool for operations different from  
those intended could result in a haz-  
ardous situation.  
8. Avoid unintentional starting. Prepare  
to begin work before turning on the  
tool.  
5. service  
9. Do not leave the tool unattended  
when it is plugged into an electrical  
outlet. Turn off the tool, and unplug it  
from its electrical outlet before leav-  
ing.  
a.have your tool serviced by a quali-  
fied repair person using only iden-  
tical replacement parts. This will  
ensure that the safety of the tool is  
maintained.  
10. This product is not a toy. Keep it out  
of reach of children.  
air compressor safety Warnings  
11. WARNING: The brass components  
of this product contain lead, a chemi-  
cal known to the State of California  
to cause birth defects (or other repro-  
ductive harm). (California Health &  
Safety code § 25249.5, et seq.)  
1. Risk of fire or explosion - do not  
spray flammable liquid in a confined  
area or towards a hot surface. Spray  
area must be well-ventilated. Do not  
smoke while spraying or spray where  
spark or flame is present. Arcing  
parts - keep compressor at least 20  
feet away from explosive vapors,  
such as when spraying with a spray  
gun.  
12. People with pacemakers should  
consult their physician(s) before use.  
Electromagnetic fields in close prox-  
imity to heart pacemaker could cause  
pacemaker interference or pacemak-  
er failure. In addition, people with  
pacemakers should:  
2. Risk of bursting - do not adjust  
regulator to result in output pressure  
greater than marked maximum pres-  
sure of attachment.  
• Avoid operating alone.  
• Do not use with power switch locked  
on.  
• Properly maintain and inspect to  
avoid electrical shock.  
• Any power cord must be properly  
grounded. Ground Fault Circuit Inter-  
3. Risk of injury - do not direct air  
stream at body. To reduce the risk of  
electric shock, do not expose to rain.  
Store indoors.  
SKU 99925  
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rupter (GFCI) should also be imple-  
mented – it prevents sustained elec-  
trical shock.  
saVe these  
instructions.  
13. Some dust created by power sand-  
ing, sawing, grinding, drilling, and  
other construction activities, contains  
chemicals known [to the State of Cali-  
fornia] to cause cancer, birth defects  
or other reproductive harm. Some  
examples of these chemicals are:  
• Lead from lead-based paints  
grounding  
to preVent  
electric shocK  
and death From  
incorrect grounding  
Wire connection:  
Check with a qualified  
electrician if you are in doubt  
as to whether the outlet is  
properly grounded. do not  
modify the power cord plug  
provided with the tool. never  
remove the grounding prong  
from the plug. do not use the  
tool if the power cord or plug  
is damaged. if damaged, have  
it repaired by a service facility  
before use. if the plug will not  
fit the outlet, have a proper  
outlet installed by a qualified  
electrician.  
• Crystalline silica from bricks and ce-  
ment or other masonry products  
• Arsenic and chromium from chemi-  
cally treated lumber  
Your risk from these exposures var-  
ies, depending on how often you do  
this type of work. To reduce your  
exposure to these chemicals: work in  
a well ventilated area, and work with  
approved safety equipment, such as  
those dust masks that are specially  
designed to filter out microscopic  
particles. (California Health & Safety  
Code § 25249.5, et seq.)  
14. WARNING: Handling the cord on  
this product will expose you to lead,  
a chemical known to the State of  
California to cause cancer, and birth  
defects or other reproductive harm.  
Wash hands after handling. (Califor-  
nia Health & Safety Code § 25249.5,  
et seq.)  
grounded tools: tools with three  
prong plugs  
15. The warnings, precautions, and in-  
structions discussed in this instruction  
manual cannot cover all possible con-  
ditions and situations that may occur.  
It must be understood by the operator  
that common sense and caution are  
factors which cannot be built into this  
product, but must be supplied by the  
operator.  
1. Tools marked with “Grounding Re-  
quired” have a three wire cord and  
three prong grounding plug. The  
plug must be connected to a properly  
grounded outlet. If the tool should  
SKU 99925  
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electrically malfunction or break  
down, grounding provides a low  
resistance path to carry electricity  
away from the user, reducing the risk  
of electric shock. (see 3-prong plug  
and outlet.)  
2. The grounding prong in the plug is  
connected through the green wire in-  
side the cord to the grounding system  
in the tool. The green wire in the cord  
must be the only wire connected to  
the tool’s grounding system and must  
never be attached to an electrically  
“live” terminal. (see 3-prong plug  
and outlet.)  
3. The tool must be plugged into an  
appropriate outlet, properly installed  
and grounded in accordance with all  
codes and ordinances. The plug and  
outlet should look like those in the  
preceding illustration. (see 3-prong  
plug and outlet.)  
symbology  
Double Insulated  
Canadian Standards Association  
Underwriters Laboratories, Inc.  
Volts Alternating Current  
V~  
Amperes  
a
n xxxx/min.  
No Load Revolutions per Minute  
(RPM)  
0
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note: For additional information regarding  
the parts listed in the following pages,  
refer to the Assembly Diagram near  
the end of this manual.  
speciFications  
Electrical Requirements 120 V~ / 60 Hz / 15 A  
Air Outlet Size  
Two 1/4” 18 NPT  
Auto Shut-off at 125  
PSI  
Restart at 90 PSI  
assembly  
Air Pressure  
1. Thread the Intake Filter (16) onto the  
side of the motor, as shown below.  
Air Tank Capacity  
Air Flow Capacity  
Oil Tank Capacity  
Oil Type  
25 Gallons  
5.3 CFM @ 40 PSI  
4.0 CFM @ 90 PSI  
1 Quart  
30W Non-Detergent  
Compressor Oil  
Sound Level  
98 dB @ 3’  
3.5 HP  
Motor  
unpacKing  
When unpacking, make sure that the  
item is intact and undamaged. If any parts  
are missing or broken, please call Harbor  
Freight Tools at the number shown on the  
cover of this manual as soon as possible.  
intake Filter (16)  
instructions For  
putting into use  
2. Connect one or two 1/4” NPT air  
hoses (rated 165 PSI or higher) to  
the Quick Couplers (25). See photo  
next page. The air hose must be  
long enough to reach the work area  
with enough extra length to allow free  
movement while working.  
read the entire important  
saFetY inFormation  
section at the beginning of this  
manual including all text under  
subheadings therein before set  
up or use of this product.  
3. Incorporate an in-line oiler, shut-off  
valve, regulator with pressure gauge,  
and filter for best service, as shown in  
the diagram below. An in-line shutoff  
valve is an important safety device  
because it controls the air supply  
even if the air hose is ruptured.  
to preVent  
serious injurY  
From accidental  
operation:  
turn the power switch of the  
tool to its “oFF” position and  
unplug the tool from its  
electrical outlet before  
assembling or making any  
adjustments to the tool.  
REV 08j  
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3. Close the in-line safety valve be-  
tween the compressor and the tool.  
male  
connector  
male  
connector  
4. Connect an air hose rated to the in-  
tended PSI that will be used with the  
tool to the Air Connection. The air  
hose must be long enough to reach  
the work area with enough extra  
length to allow free movement while  
working.  
tool  
Quick  
coupler  
air hose  
on reel  
Valve  
Filter  
oiler  
air  
5. Plug the Power Cord into a grounded  
120 V electrical outlet.  
compressor  
Quick  
coupler  
regulator with  
pressure gauge  
6. Move the Power Switch up to the ON  
position.  
recommended air line components  
power  
switch  
(23)  
pressure  
regulator  
(20)  
operating instructions  
read the entire important  
saFetY inFormation  
section at the beginning of this  
manual including all text under  
subheadings therein before set  
up or use of this product.  
to preVent  
serious injurY  
From accidental  
operation:  
safety  
Valve  
(22)  
tool  
pressure  
gauge  
tank  
pressure  
gauge  
Quick  
coupler  
(25)  
turn the power switch of the  
tool to its “oFF” position and  
unplug the tool from its  
electrical outlet before  
performing any inspection,  
maintenance, or cleaning  
procedures.  
7. Allow the Air Compressor to build up  
pressure until it cycles off.  
8. Adjust the air compressor’s Pressure  
Regulator (20) so that the air output  
is enough to properly power the tool,  
but the output will not exceed the  
tool’s maximum air pressure at any  
time. Turn the knob clockwise to  
increase pressure and counter-clock-  
wise to decrease pressure. Adjust  
the pressure gradually, while check-  
1. Make sure the air tool’s throttle or  
switch is in the off position.  
2. Connect the tool that will be used for  
the job to the airline.  
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ing the air output gauge to set the  
right pressure range.  
9. The Air Compressor will cycle up to  
125 PSI before shutting off. It will  
start to build pressure again when the  
PSI of the Compressor drops to 90  
PSI.  
10. If the Compressor becomes too hot  
the circuit breaker will trip and it will  
shut off. If this happens;  
a. move the Power Switch to the OFF  
position;  
drain Valve  
b. unplug the Air Compressor;  
14. Disconnect the air hose and tool.  
c. wait until the Compressor cools  
down;  
15. To prevent accidents, disconnect its  
power supply after use. Clean, then  
store the tool indoors out of children’s  
reach.  
d. plugging the Air Compressor back in  
will reset the circuit breaker;  
e. turn Power Switch back to the ON  
position and resume operation.  
11. After the job is complete, move the  
Power Switch to the OFF position.  
12. Pull down on the Safety Valve by  
Tank Pressure Gauge to release  
pressure. Squeeze the Trigger of the  
air tool to release pressure from the  
line.  
13. Turn the Drain Valve (29), at the bot-  
tom of the Tank, two turns to release  
any built-up moisture. Close the  
valve after moisture has drained out.  
Do not remove the Drain Valve.  
REV 08j  
SKU 99925  
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be replaced only by a qualified  
service technician.  
maintenance and  
serVicing  
please read the FolloWing  
careFullY  
Procedures not specifically  
explained in this manual  
must be performed only by a  
qualified technician.  
THE MANUFACTURER AND/OR DISTRIBUTOR  
hAS PRovIDED thE PARtS LISt AND  
ASSEMbLy DIAgRAM IN thIS MANUAL AS  
A REfERENCE tooL oNLy. NEIthER thE  
MANUFACTURER OR DISTRIBUTOR MAKES  
ANY REPRESENTATION OR WARRANTY OF  
ANY KIND TO THE BUYER THAT HE OR SHE  
IS qUALIfIED to MAkE ANy REPAIRS to thE  
PRoDUCt, oR thAt hE oR ShE IS qUALIfIED  
to REPLACE ANy PARtS of thE PRoDUCt.  
IN FACT, THE MANUFACTURER AND/OR  
DIStRIbUtoR ExPRESSLy StAtES thAt  
ALL REPAIRS AND PARtS REPLACEMENtS  
ShoULD bE UNDERtAkEN by CERtIfIED  
AND LICENSED tEChNICIANS, AND Not by  
thE bUyER. thE bUyER ASSUMES ALL RISk  
AND LIAbILIty ARISINg oUt of hIS oR hER  
REPAIRS to thE oRIgINAL PRoDUCt oR  
REPLACEMENt PARtS thEREto, oR ARISINg  
oUt of hIS oR hER INStALLAtIoN of  
REPLACEMENt PARtS thEREto.  
to preVent  
serious injurY  
From accidental  
operation:  
turn the power switch of the  
tool to its “oFF” position and  
unplug the tool from its  
electrical outlet before  
performing any inspection,  
maintenance, or cleaning  
procedures.  
to preVent serious  
injurY From tool  
Failure:  
do not use damaged  
equipment. if abnormal noise  
or vibration occurs, have the  
problem corrected before  
further use.  
cleaning, maintenance, and  
lubrication  
1. BeFore each use, inspect the  
general condition of the tool. Check  
for loose screws, misalignment or  
binding of moving parts, cracked or  
broken parts, damaged electrical wir-  
ing, and any other condition that may  
affect its safe operation.  
2. aFter use, clean external surfaces  
of the tool with clean cloth.  
3.  
Warning! if the supply cord of  
this power tool is damaged, it must  
SKU 99925  
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troubleshooting  
problem  
Overheating  
possible causes  
1. Poor ventilation.  
likely solutions  
1. Move the compressor to an area with better  
air circulation.  
2. Dirty cooling surfaces.  
2. Clean compressor.  
3. Compressor undersized for  
application.  
3. Check air requirements of tools.  
Compressor  
operates, but with  
low air output  
1. Valve or regulator loose or  
leaking.  
1. Repair leaks.  
2. Valve or regulator damaged.  
2. Have valve or regulator repaired by a  
qualified technician.  
3. Air tank not pressurized yet.  
Incorrect pressure 1. Pressure gauge worn or  
gauge reading damaged.  
3. Allow pressure to build.  
1. have pressure gauge replaced by a qualified  
technician.  
Follow all safety precautions whenever diagnosing or servicing the  
tool. disconnect air supply before service.  
SKU 99925  
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parts list  
parts list  
part  
description  
Qty  
2
1
4
4
4
4
1
1
1
1
1
1
part  
description  
Qty  
1
1
1
2
1
1
1
1
1
2
1
1
1
2
3
4
5
6
7
8
9
Pad  
Air Tank  
Screw  
Spacer  
Washer  
16 Intake Filter  
17 Check Valve  
18 Bleeder Tube  
19 Pressure Gauge  
20 Pressure Regulator  
21 Plug  
22 Safety Valve  
23 Power Switch  
24 Connector Block  
25 Quick Coupler  
26 Power Cord  
27 Bolt  
Bolt  
Pump/Motor Assembly  
Oil Plug  
Elbow  
10 Shroud  
11 Transfer Tube  
12 Grip  
13 Washer  
14 Screw  
15 Screw  
2
2
2
28 Pin  
29 Drain Valve  
30 Wheel  
2
2
2
record products serial number here:  
note: If product has no serial number, record month and year of purchase instead.  
note: Some parts are listed and shown for illustration purposes only, and are not avail-  
able individually as replacement parts.  
SKU 99925  
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assemBlY diagram  
SKU 99925  
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limited 1 Year / 90 daY WarrantY  
Harbor Freight Tools Co. makes every effort to assure that its products meet high  
quality and durability standards, and warrants to the original purchaser that for a period  
of one year from date of purchase that the tank is free of defects in materials and work-  
manship (90 days if used by a professional contractor or if used as rental equipment).  
Harbor Freight Tools also warrants to the original purchaser, for a period of ninety days  
from date of purchase, that all other parts and components of the product are free from  
defects in materials and workmanship. This warranty does not apply to damage due di-  
rectly or indirectly to misuse, abuse, negligence or accidents, repairs or alterations out-  
side our facilities, normal wear and tear, or to lack of maintenance. We shall in no event  
be liable for death, injuries to persons or property, or for incidental, contingent, special  
or consequential damages arising from the use of our product. Some states do not allow  
the exclusion or limitation of incidental or consequential damages, so the above limita-  
tion of exclusion may not apply to you. thIS wARRANty IS ExPRESSLy IN LIEU of  
ALL othER wARRANtIES, ExPRESS oR IMPLIED, INCLUDINg thE wARRANtIES  
of MERChANtAbILIty AND fItNESS.  
To take advantage of this warranty, the product or part must be returned to us with  
transportation charges prepaid. Proof of purchase date and an explanation of the com-  
plaint must accompany the merchandise. If our inspection verifies the defect, we will ei-  
ther repair or replace the product at our election or we may elect to refund the purchase  
price if we cannot readily and quickly provide you with a replacement. We will return re-  
paired products at our expense, but if we determine there is no defect, or that the defect  
resulted from causes not within the scope of our warranty, then you must bear the cost  
of returning the product.  
this warranty gives you specific legal rights and you may also have other rights  
which vary from state to state.  
3491 Mission Oaks Blvd. • PO Box 6009 • Camarillo, CA 93011 • (800) 444-3353  
SKU 99925  
For technical questions, please call 1-800-444-3353.  
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