Harbor Freight Tools Air Compressor 67698 User Manual

145 Psi 5 HP Twin Cylinder  
Air ComPressor PumP  
model 67698  
seT uP And oPerATing insTruCTions  
wArning  
To prevent serious injury and  
death from improper installation:  
ONLY a qualified engineer with  
appropriate certifications may attempt  
designing a new compressor to ensure  
that all required safety and control  
elements are in place and will work  
together properly and safely. This  
compressor pump is intended ONLY  
as a replacement for a similarly rated  
pump on an existing compressor that  
includes all other needed components.  
Constructing a new compressor  
using this pump is not covered by the  
manual.  
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 2010 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.  
manual revised 10h  
 
noTiCe is used to  
address practices not  
sAVe THis mAnuAl  
Keep this manual for the safety warnings  
and precautions, assembly, operating,  
inspection, maintenance and cleaning  
procedures. Write the product’s serial number  
in the back of the manual near the assembly  
diagram (or month and year of purchase if  
product has no number). Keep this manual  
and the receipt in a safe and dry place for  
future reference.  
related to personal injury.  
CAuTion, without the  
safety alert symbol, is  
used to address practices not  
related to personal injury.  
general Compressor safety  
warnings  
wArning read all safety warnings  
and instructions. Failure to follow  
the warnings and instructions may  
result in electric shock, fire and/or  
serious injury.  
imPorTAnT sAFeTy  
inFormATion  
in this manual, on the labeling, and  
all other information provided with  
this product:  
save all warnings and instructions  
for future reference.  
1. work area safety  
This is the safety alert  
symbol. it is used to alert  
you to potential personal  
injury hazards. obey all  
safety messages that follow  
this symbol to avoid possible  
injury or death.  
a. keep work area clean and well lit.  
Cluttered or dark areas invite accidents.  
b. do not operate the Compressor  
Pump in explosive atmospheres,  
such as in the presence of flammable  
liquids, gases or dust. Compressor  
Pump motors produce sparks which  
may ignite the dust or fumes.  
dAnger indicates a  
hazardous situation  
which, if not avoided, will result  
in death or serious injury.  
c. keep children and bystanders away  
from an operating compressor pump.  
2. Personal safety  
wArning indicates a  
hazardous situation  
which, if not avoided, could  
result in death or serious injury.  
a. stay alert, watch what you are  
doing and use common sense when  
operating this compressor pump. do  
not use this compressor pump while  
you are tired or under the influence  
of drugs, alcohol or medication. A  
moment of inattention while operating a  
compressor pump may result in serious  
personal injury.  
CAuTion, used with  
the safety alert  
symbol, indicates a hazardous  
situation which, if not avoided,  
could result in minor or moderate  
injury.  
b. use personal protective equipment.  
Always wear Ansi-approved eye  
protection during setup and use.  
Safety equipment such as a dust mask,  
SKU 67698  
For technical questions, please call 1-800-444-3353.  
Page 3  
 
non-skid safety shoes, hard hat, or  
hearing protection used for appropriate  
conditions will reduce personal injuries.  
using only identical replacement  
parts. This will ensure that the safety of  
the compressor pump is maintained.  
3. Compressor Pump use and care  
Compressor Pump  
safety warnings  
a. disconnect the plug of the  
compressor from the power source  
before making any adjustments,  
changing accessories, or storing the  
compressor pump. Such preventive  
safety measures reduce the risk of  
starting the unit accidentally.  
1. Wear ANSI-approved safety goggles  
during use.  
2. Install pulley and belt safety guard before  
use.  
3. Before first and every use, verify  
b. store an idle compressor pump  
out of the reach of children and  
do not allow persons unfamiliar  
with the compressor pump or  
these instructions to operate it. A  
compressor pump is dangerous in the  
hands of untrained users.  
Pump has sufficient oil.  
4. The use of accessories or attachments  
not recommended by the manufacturer  
may result in a risk of injury to persons.  
5. misalignment between motor and  
Pump can damage the belt wheel.  
Use a straight edge, such as a yardstick,  
to check and adjust alignment as  
needed.  
c. maintain the compressor pump.  
keep the compressor pump clean  
for better and safer performance.  
Follow instructions for lubricating  
and changing accessories. keep  
the outside surfaces dry, clean and  
free from oil and grease. Check for  
misalignment or binding of moving  
parts, breakage of parts and any  
other condition that may affect the  
compressors operation. if damaged,  
have the compressor repaired before  
use. Many accidents are caused by a  
poorly maintained compressor pump.  
6. use proper size motor and motor  
pulley. This air compressor Pump must  
be installed with a 5 HP electric motor  
and pulley (both not supplied) which can  
turn the Air Compressor Belt Wheel at  
approximately 1050 rpm.  
7. install motor, pulley belt and pulley  
belt cover securely. Be sure to use the  
proper size bolts to install your motor  
(not included). The belt and belt cover  
(not included) must be strong enough to  
prevent breaking and possible injury.  
d. use the compressor pump in  
accordance with these instructions,  
taking into account the working  
conditions and the work to be  
performed. Use of the compressor  
pump for operations different from those  
intended could result in a hazardous  
situation.  
8. be sure all equipment is rated to the  
appropriate capacity of this pump.  
Make sure that the lowest rated piece  
of equipment you are using can handle  
the maximum pressure of the Air  
Compressor Pump (see Specifications).  
4. service  
a. Have your compressor pump  
9. do not direct the air outlet at any  
person or animal.  
serviced by a qualified repair person  
Page 4  
For technical questions, please call 1-800-444-3353.  
SKU 67698  
 
10. use safety guard for Pulleys. The Air  
Compressor Pump Pulley (58), V-belt  
(not supplied), and motor pulley (not  
supplied) must be covered by a safety  
guard (not supplied) covering all moving  
elements before operation.  
9. Do not remove the valve cover or adjust  
internal components.  
10. Compressor head gets hot during  
operation. Do not touch it or allow  
children nearby during or immediately  
following operation.  
11. Avoid burns. The Cylinder (22), Cylinder  
Head (6) and Air Outlet components  
become very hot during operation. Do  
not touch.  
11. Do not use the air hose to move the  
compressor.  
12. Release the pressure in the storage tank  
before moving.  
Air Compressor safety warnings  
13. The use of accessories or attachments  
not recommended by the manufacturer  
may result in a risk of injury to persons.  
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.  
14. All air line components, including hoses,  
pipe, connectors, filters, etc., must be  
rated for a minimum working pressure  
of 150 PSI, or 150% of the maximum  
system pressure, whichever is greater.  
15. USE OF AN EXTENSION CORD IS NOT  
RECOMMENDED. If you choose to  
use an extension cord, use the following  
guidelines:  
2. risk of bursting - do not adjust  
regulator higher than marked  
maximum pressure of attachment.  
reCommended minimum wire  
gAuge For eXTension Cords  
3. risk of injury - do not direct air  
stream at people or animals.  
(120 VolT)  
eXTension Cord  
lengTH  
nAmePlATe  
AmPeres  
(at full load)  
4. do not use to supply breathing air.  
25’  
50’ 100’ 150’  
5. do not leave compressor unattended  
for an extended period while plugged  
in. unplug compressor after working.  
0 – 6  
18  
18  
16  
14  
16  
16  
16  
12  
16  
14  
6.1 – 10  
do not use.  
do not use.  
do not use.  
10.1 – 12  
12.1 – 16  
TAble A  
6. keep compressor well-ventilated. do  
not cover compressor during use.  
7. Drain Compressor Tank daily and after  
use. Internal rust causes tank failure  
and explosion.  
a. Make sure your extension cord is in  
good condition.  
b. Be sure to use an extension cord  
which is heavy enough to carry the  
current your product will draw. An  
undersized cord will cause a drop in line  
voltage resulting in loss of power and  
8. Add correct amount of compressor  
oil before first use and every use.  
Operating with low or no oil causes  
permanent damage and voids warranty.  
SKU 67698  
For technical questions, please call 1-800-444-3353.  
Page 5  
 
overheating. Table A shows the correct 23. The warnings, precautions, and  
size to use depending on cord length  
and nameplate ampere rating. If in  
doubt, use the next heavier gauge. The  
smaller the gauge number, the heavier  
the cord.  
instructions discussed in this instruction  
manual cannot cover all possible  
conditions 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.  
16. Industrial applications must follow OSHA  
guidelines.  
17. Maintain labels and nameplates on the  
compressor. These carry important  
safety information. If unreadable or  
missing, contact Harbor Freight Tools for  
a replacement.  
sAVe THese  
insTruCTions.  
grounding  
18. This product is not a toy. Keep it out of  
reach of children.  
To PreVenT  
eleCTriC sHoCk  
And deATH From inCorreCT  
grounding wire  
19. Operate unit on level surface. Check  
oil level daily and fill to marked level if  
needed.  
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  
compressor. never remove the  
grounding prong from the plug.  
do not use the compressor 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.  
20. People with pacemakers should  
consult their physician(s) before use.  
Electromagnetic fields in close proximity  
to heart pacemaker could cause  
pacemaker interference or pacemaker  
failure.  
21. WARNING: The brass components of  
this product contain lead, a chemical  
known to the State of California to cause  
birth defects (or other reproductive  
harm). (California Health & Safety code  
§ 25249.5, et seq.).  
22. By supplying this air compressor  
pump, Harbor Freight Tools makes  
no representations and accepts no  
responsibility for the motor, V-belt,  
enclosure or mounting surface not  
supplied by HFT which may be used  
in the installation. You are strongly  
advised to have this pump properly  
installed by a qualified service technician  
using appropriate components in good  
condition.  
Page 6  
For technical questions, please call 1-800-444-3353.  
SKU 67698  
 
symbology  
sPeCiFiCATions  
Pounds per square inch of  
pressure  
Single Stage Twin Cylinder; Oil  
Lube Pump  
Psi  
CFm  
sCFm  
nPT  
Compressor Type  
Required HP  
5 HP motor  
Cubic Feet per Minute flow  
Rated Air Pressure 145 PSI  
Cubic Feet per Minute flow at  
standard conditions  
Maximum Speed  
Outlet  
1050 RPM  
1” - 16UN  
Air Delivery  
(@ 655 RPM)*  
12.1 SCFM @ 40 PSI  
11.5 SCFM @ 90 PSI  
National pipe thread, tapered  
National pipe thread, straight  
Double Insulated  
Air Delivery  
(@ 1050 RPM)*  
17.5 SCFM @ 40 PSI  
15.2 SCFM @ 90 PSI  
nPs  
Splash Type with Oil Level  
Window  
Lubrication  
Oil Type  
SAE 30W non-detergent Air  
Compressor Oil  
(Sold separately)  
(SKU 95048)  
Canadian Standards Association  
Underwriters Laboratories, Inc.  
Volts Alternating Current  
Amperes  
Pump Pulley  
Belt Type  
14-1/2” dia. with dual V-groove  
A 1600  
Mounting Hole  
Pattern  
5-1/4” x 10-3/16”  
(center-to-center)  
V~  
A
Recommended  
Mounting Bolts  
3/8” dia., grade 5 or better  
Overall Dimensions 17-3/4” L x 12-1/4” W x 15” H  
89 dB @ 1m  
Sound Level  
10-3/16”  
(including motor noise)  
* For most applications it is recommended to  
run this unit at the lower RPM.  
mounting Hole Pattern  
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 1-800-444-3353 as soon as  
possible.  
reV 10h  
SKU 67698  
For technical questions, please call 1-800-444-3353.  
Page 7  
 
Components  
insTruCTions For PuTTing  
inTo use  
Air Filter Assemblies (7)  
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.  
Oil Fill Plug  
(45)  
To PreVenT  
serious injury  
From ACCidenTAl  
oPerATion:  
Crankcase  
(46)  
Turn off and disable the motor  
before assembling or making any  
adjustments to the compressor  
pump.  
Pump Pulley  
(58)  
Oil Sight Glass (38)  
Oil Drain Plug (36)  
Figure 1  
To PreVenT  
serious injury  
And deATH From imProPer  
insTAllATion:  
Assembly  
ONLY a qualified engineer with  
appropriate certifications may  
attempt designing a new  
compressor to ensure that all  
required safety and control  
elements are in place and will  
work together properly and  
safely. This compressor pump  
is intended only as a  
replacement for a similarly  
rated pump on an existing  
compressor that includes all  
other needed components.  
Constructing a new compressor  
using this pump is not covered  
by this manual.  
Insert Pump Pulley (58)  
with this side facing you.  
Crankshaft (49)  
Keyway  
Woodruff Key (50)  
Washer (59)  
Spring Washer (60)  
Bolt (61)  
Figure 2  
1. Place a small amount of grease in the  
slot at the tapered end of the Crankshaft  
(49) and insert the Woodruff Key (50)  
into the slot.  
note: For additional information regarding the  
parts listed in the following pages, refer  
to the Assembly Diagram near the end of  
this manual.  
2. Make sure that the center hole and the  
keyway on the Pump Pulley (58) are  
clean and free of burrs and rough edges.  
Page 8  
For technical questions, please call 1-800-444-3353.  
SKU 67698  
 
3. Apply a thin layer of grease to the hole  
and keyway, then, with the indented side  
of the Pulley center facing you, align  
the keyway with the Woodruff Key (50)  
and slide the Pump Pulley (58) over the  
Crankshaft.  
Pump Pulley  
Motor Pulley  
wArning! do not force or hammer the  
Pump Pulley onto the Crankshaft.  
Calculation for motor Pulley:  
9,497.5  
motor  
Pulley  
dia.  
(14.5” Pump Pulley dia. x 655 Pump rPm)  
4. Slide the Spring Washer (60) and  
Washer (59) onto the Bolt (61) and insert  
the Bolt through Pump Pulley and thread  
into the Crankshaft. Tighten using a  
wrench (not included).  
=
motor rPm  
To calculate the motor and motor pulley  
needed to power the pump, multiply the  
Pump Pulley diameter (14.5”) times the  
pump working RPM (1050), then divide  
by the engine RPM. This will determine  
the motor pulley diameter (in inches)  
needed to run the unit.  
note: The bolt is a left-hand thread. To  
fasten, turn bolt counterclockwise.  
installation  
For example: If you have a 1725 RPM  
motor, to calculate the pulley diameter  
needed, multiply 14.5 x 655, then divide  
by 1725, which equals the motor pulley  
size of 5.5”. Use the pulley size closest  
to this figure.  
note: depending on your level of  
expertise, you may wish to have a  
qualified technician perform this  
installation.  
CAuTion: Avoid damage to the Air  
Compressor Pump and other equipment.  
The Compressor Pump mounting  
9,497.5  
5.5”  
=
1725  
platform should be flat, level, and strong  
enough to support the combined weight  
of the Pump, electric motor or engine,  
and related hardware and equipment. It  
must also be capable of withstanding the  
vibration and tension of the drive belts. It  
must incorporate easy access to the Oil  
Drain Plug (36).  
Or, use the following equation if you  
have a 3450 RPM motor:  
9,497.5  
3450  
2.75”  
=
2. The 14-1/2 inch V-groove Pump Pulley  
(58) must be in perfect alignment with  
the motor pulley (not included).  
1. Place the Air Compressor Pump on the  
mounting surface at the same level as the 5  
HP motor used to drive it.  
note: Ensure the Pump Pulley is installed for  
counter-clockwise rotation when facing  
the pulley side of the Pump.  
note: Use a motor with the appropriate size  
pulley to get the needed Pump RPM. For  
most applications it is recommended to  
run this unit at the lower RPM.  
CAuTion: misalignment between the  
motor and the Pump can cause  
damage to both the motor and the  
compressor pump. Use a straight edge,  
such as a yardstick, to check and adjust  
alignment as needed.  
SKU 67698  
For technical questions, please call 1-800-444-3353.  
Page 9  
 
3. Verify that the Pump Pulley turns freely  
where it overhangs the mounting  
surface.  
The safety guard must be sturdy enough  
to prevent injury.  
wArning! Avoid serious injuries. Do not  
operate this Air Compressor Pump  
without a pulley guard in place.  
4. Place two V-groove belts (not included)  
over the Pump Pulley (58) and the motor  
pulley.  
Checking the oil  
5. Pull the Compressor Pump until properly  
aligned, and the belts are tight. Recheck  
the motor pulley, V-groove belts, and  
Pump Pulley alignment.  
Check the oil level before operation.  
Fill the Pump Crankcase with sAe 30w  
non-detergent air compressor oil  
(sold separately).  
6. Use a pencil to mark through the Air  
Compressor Pump mounting holes onto  
the mounting surface.  
imPorTAnT: running the Air Compressor  
Pump with the incorrect amount of oil  
will cause damage to the equipment  
and void the warranty. To prevent  
damage, do not use with overfilled  
or low oil. Slowly fill to full line, wait  
2 minutes and fill back up to full line.  
The Compressor Pump has small  
passages that will fill slowly.  
7. Move Air Compressor Pump and drill four  
3/8” holes in the mounting surface.  
8. Move the Air Compressor Pump back to  
its mounting position.  
9. Secure each corner of base with a 3/8”  
diameter grade 5 or better bolt, washer,  
lock washer, and nut (all not supplied).  
Crankcase (46)  
10. Make final alignment and belt tightness  
adjustments from the motor. It may be  
necessary to loosen the motor mounting  
bolts to adjust the motor location. To test  
the proper tension on the V-belts, press  
down on the belts, there should be 1/2”  
deflection or less at mid span. Tighten  
all mounting hardware.  
Oil Sight Glass (38)  
OIL LEVEL  
oVerFill  
Full  
low  
11. Connect plumbing hardware (not  
supplied) from the 3/4” Air Outlet  
(Elbow (1)) to the air destination (i.e.,  
air pressure tank of the compressor,  
not supplied), routing the tubing in the  
shortest possible path.  
Figure 3  
The oil level should be at the center of  
the “full” level on the oil level sight glass,  
as shown above. Add oil as needed to  
maintain this level. Do not let the oil level  
go below the center dot (LOW as shown  
above) and do not overfill the oil so that  
it is above the center dot (OVERFILL as  
shown above) on the sight glass.  
12. Install a safety guard (not supplied) that  
surrounds the Motor Pulley, V-belts, and  
Pump Pulley. This safety guard must  
cover all sides of the moving belts and  
pulleys. It should have a clearance of  
about one inch from the moving parts.  
To add oil:  
reV 10h  
Page 10  
For technical questions, please call 1-800-444-3353.  
SKU 67698  
 
a. Remove the Oil Fill Plug (45).  
b. Using a funnel to avoid spills, pour  
enough oil into the Pump Crankcase  
to reach the “full” level in the Oil Sight  
Glass.  
c. Replace the Oil Fill Plug.  
Cold weather operation  
Premium quality 30-weight, non-  
detergent air compressor oil (sold  
separately) is recommended for use  
with this compressor pump. Start the  
compressor pump in a heated area if  
outdoor temperatures drop below 32°  
F. If this is not practical, drain out the  
old pump oil and use SAE 10W Non-  
detergent Air Compressor Oil in the  
pump crankcase instead whenever the  
compressor pump’s temperature will fall  
below 40°. Do not use multi-viscosity  
oil (such as 10W-30), they leave carbon  
deposits on pump components and lead  
to accelerated failure. Heavy operation  
may require heavier viscosity oil.  
If uncertain which oil to use, please call  
Harbor Freight Tools customer service at  
1-800-444-3353 for assistance.  
wArning! To prevent serious injury from  
burns: Do not add or change the oil  
while the motor is in operation. Allow the  
components to cool before replacing oil.  
After filling with oil, follow your air  
compressor operation instructions  
and safety warnings.  
Change the compressor oil after the  
first hour of use to remove any debris.  
SKU 67698  
For technical questions, please call 1-800-444-3353.  
Page 11  
 
note: The environment and frequency of  
use can affect how often you will need  
to check components and perform  
maintenance procedures.  
mAinTenAnCe And  
serViCing  
Procedures not specifically  
explained in this manual must  
be performed only by a qualified  
technician.  
daily:  
a. Check oil level.  
b. Check for oil leaks.  
c. Make sure all nuts and bolts are tight.  
d. Check for abnormal noise or vibration.  
e. Inspect belt.  
To PreVenT  
serious injury  
From ACCidenTAl  
oPerATion:  
Turn off and disable the motor  
before performing any  
inspection, maintenance, or  
cleaning procedures.  
weekly:  
a. Inspect Air Filters.  
b. Inspect Oil Breather Plug.  
To PreVenT serious injury  
From ComPressor FAilure:  
do not use damaged equipment.  
if abnormal noise or vibration  
occurs, have the problem  
monthly:  
Check belt adjustment.  
corrected before further use.  
every 6 months or 100 operation Hours:  
*
note: The following service instructions are  
for this Pump installed on a complete  
compressor, including all needed  
Replace Pump oil.  
oil maintenance  
components (all sold separately).  
Check the oil periodically for clarity.  
Replace oil if it appears milky or if debris  
is present, or every 6 months, or 100  
hours of run time, whichever comes first.  
In harsh environments such as high heat  
or high humidity, you will need to replace  
the oil more frequently.  
Cleaning, maintenance, and  
lubrication  
1. beFore eACH use, inspect the  
general condition of the Air Compressor.  
Check for loose hardware, misalignment  
or binding of moving parts, damaged  
belts, cracked or broken parts, damaged  
electrical wiring, and any other condition  
that may affect its safe operation.  
wArning: Risk of personal injury hazard.  
Allow Air Compressor to cool before  
changing the oil.  
To drain the oil from the Pump Crankcase:  
2. AFTer use, wipe external surfaces of  
the unit with a clean cloth.  
a. Place a container under the Oil Drain  
Plug (36).  
maintenance schedule  
b. Remove the Oil Fill Plug (45) to allow air  
flow into the Pump.  
Following are general guidelines for  
maintenance checks of the unit.  
* Use Air Compressor Oil only (sold  
separately - SKU 95048).  
Page 12  
For technical questions, please call 1-800-444-3353.  
SKU 67698  
 
c. Remove the Oil Drain Plug, allowing the  
oil to drain into the container.  
Air Filter maintenance  
Check the Air Filters weekly to see if they  
need replacement. If working in dirty  
environments, you may need to replace  
the filters more often. To replace the Air  
Filters:  
d. When the oil is completely drained from  
the Pump, replace the Oil Drain Plug.  
e. Fill the Pump with new compressor oil  
to the FULL level on the Oil Sight Glass.  
f. Replace and tighten the Oil Fill Plug.  
a. Remove any cover that blocks access  
to the Air Filters.  
g. Discard the old oil according to local,  
state and federal regulations.  
b. Remove the Air Filters.  
c. Replace with new Air Filters.  
d. Replace the cover.  
Troubleshooting  
Problem  
Compressor builds  
Possible Causes  
likely solutions  
1. Crankcase overfilled with oil or 1. Drain oil and refill to proper level with recommended oil.  
pressure too slowly  
oil too thick.  
2. Working environment too cold. 2. Move unit to a warmer location. Check that recommended oil  
is in crankcase.  
3. Loose fittings.  
3. Reduce air pressure, then check all fittings with a soap solution  
for air leaks and tighten as needed. Do not overtighten.  
Compressor not  
building enough air  
pressure  
1. Filters need cleaning/replacing. 1. Check inlet and outlet filters. Clean and/or replace as needed.  
2. Crankcase oil too thick.  
3. Loose fittings.  
2. Drain oil and refill to proper level with recommended oil.  
3. Reduce air pressure, then check all fittings with a soap solution  
for air leaks and tighten as needed. Do not overtighten.  
1. Drain oil and refill to proper level with recommended oil.  
High Oil  
Consumption  
1. Crankcase oil too thin.  
2. Unit not on level surface.  
3. Crankcase vent clogged.  
2. Reposition unit on a level surface.  
3. Clean Crankcase vent.  
Overheating  
1. Filters need cleaning/replacing. 1. Check inlet and outlet filters. Clean and/or replace as needed.  
2. Crankcase oil incorrect type  
and/or thickness.  
2. Drain oil and refill to proper level with recommended oil.  
3. Crankcase oil level too low.  
3. Add oil to proper level, check for leaks.  
4. Unusually dusty environment. 4. Clean and/or replace filters more often or move unit to cleaner  
environment.  
Excessive noise  
1. Crankcase overfilled with oil  
or oil is incorrect thickness or  
type.  
1. Drain oil and refill to proper level with recommended oil.  
2. Crankcase oil level too low.  
2. Add oil to proper level, check for leaks.  
3. Loose or damaged belt guard. 3. Replace belt guard.  
4. Loose fittings.  
4. Reduce air pressure, then check all fittings with a soap solution  
for air leaks and tighten as needed. Do not overtighten.  
5. Unit not on level surface.  
1. Crankcase oil too thin or  
crankcase overfilled with oil.  
5. Reposition unit on a level surface.  
1. Drain oil and refill to proper level with recommended oil.  
Oil in discharge air  
2. Crankcase vent clogged.  
2. Clean Crankcase vent.  
Air leaks from pump Loose fittings.  
or fittings  
Reduce air pressure, then check all fittings with a soap solution for  
air leaks and tighten as needed. Do not overtighten.  
Follow all safety precautions whenever diagnosing or servicing the  
compressor. disconnect power supply before service.  
reV 10h  
SKU 67698  
For technical questions, please call 1-800-444-3353.  
Page 13  
 
PArTs lisT  
Part  
description  
Qty  
1
1
1
1
8
8
2
2
2
2
2
2
12  
12  
4
2
2
2
2
8
8
8
2
2
2
2
2
2
2
2
4
2
1
Part  
description  
Qty  
2
1
1
1
1
1
4
4
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
2
1
1
6
6
1
1
1
1
1
2
3
Exhaust Elbow  
33 Exhaust Nut  
Exhaust 3-way  
Nut  
34 Exhaust Copper Pipe  
35 Collar  
36 Oil Drain Plug  
37 O-Ring  
38 Oil Sight Glass  
39 Bolt  
40 Spring Washer  
41 Bearing Cover  
42 Bearing Cover Gasket  
43 Bearing  
3a Clamp Ring  
4
5
6
7
8
9
Bolt  
Spring Washer  
Cylinder Head  
Air Filter Assembly  
Air Filter Rear Cover  
Air Filter Element  
10 Air Filter Front Cover  
11 Cylinder Head Gasket  
12 Screw  
13 Spring Washer  
14 Outlet Valve Guard  
15 Valve Plate  
16 Valve Seat  
17 Valve Plate  
18 Cylinder Gasket  
19 Nut  
20 Spring Washer  
21 Stud  
44 O-Ring  
45 Oil Fill Plug  
46 Crankcase  
47 Circlip for Shaft  
48 Washer  
49 Crankshaft  
50 Woodruff Key  
51 Bearing  
52 Oil Seal  
53 Bearing Seat Gasket  
54 Bearing Seat  
55 Breather Assembly  
55a Breather  
55b Washer  
55c Ball  
55d Breather Rod  
56 Spring Washer  
57 Bolt  
58 Pump Pulley  
59 Washer  
22 Cylinder  
23 Cylinder Gasket  
24 Piston Ring Set  
25 Compression Ring  
26 Compression Ring  
27 Oil Ring  
28 Piston  
29 Piston Pin  
30 Circlip for Hole  
31 Connecting Rod  
32 Exhaust Copper Pipe Assembly  
60 Spring Washer  
61 Bolt  
PleAse reAd THe Following CAreFully  
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.  
REV 10h  
Page 14  
For technical questions, please call 1-800-444-3353.  
SKU 67698  
 
Assembly diAgrAm  
REV 10h  
SKU 67698  
For technical questions, please call 1-800-444-3353.  
Page 15  
 
limiTed 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 this product is free from  
defects in materials and workmanship for the period of 90 days from the date of purchase. This  
warranty does not apply to damage due directly or indirectly, to misuse, abuse, negligence or  
accidents, repairs or alterations outside our facilities, criminal activity, improper installation,  
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 limitation 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 complaint  
must accompany the merchandise. If our inspection verifies the defect, we will either 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 repaired 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  
record Product’s 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 available  
individually as replacement parts.  
Page 16  
For technical questions, please call 1-800-444-3353.  
SKU 67698  
 

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