Central Pneumatic 62913 Assembly instructions

30
_
GAL gas powered two-stage
air compressor
Visit our website at: http://www.harborfreight.com
Email our technical support at: [email protected] ITEM 62913
Owner’s Manual & Safety Instructions
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.
Using a generator indoors CAN
KILL YOU IN MINUTES.
Generator exhaust contains
carbon monoxide. This is a poison
you cannot see or smell.
NEVER use inside
a home or garage,
EVEN IF doors and
windows are open.
Only use OUTSIDE
and far away from
windows, doors,
and vents.
When unpacking, make sure that the product is intact
and undamaged. If any parts are missing or broken,
please call 1-888-866-5797 as soon as possible.
Copyright©2015 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.
Read this material before using this product.
Failure to do so can result in serious injury.
SAVE THIS MANUAL.
REV 15k

Page 2 For technical questions, please call 1-888-866-5797. Item 62913
SAFETY OPERATION MAINTENANCEINSTALLATION
Table of Contents
Safety ......................................................... 2
Installation .................................................. 2
Specifications ............................................. 6
Operation................................................... 10
Maintenance.............................................. 14
Parts List and Diagram.............................. 18
Warranty .................................................... 20
WARNING SYMBOLS AND DEFINITIONS
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.
Indicates a hazardous situation which, if not avoided,
will result in death or serious injury.
Indicates a hazardous situation which, if not avoided,
could result in death or serious injury.
Indicates a hazardous situation which, if not avoided,
could result in minor or moderate injury.
Addresses practices not related to personal injury.

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SAFETYOPERATIONMAINTENANCE INSTALLATION
IMPORTANT SAFETY INFORMATION
General 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.
Save all warnings and instructions for future reference.
The warnings, precautions, and 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.
Set Up Precautions
1. Keep work area clean and well lit.
Cluttered or dark areas invite accidents.
2. Do not operate the Compressor in explosive
atmospheres, such as in the presence of
flammable liquids, gases or dust. Gasoline-
powered engines may ignite the dust or fumes.
3. Keep children and bystanders away
from an operating compressor.
4. Gasoline fuel and fumes are flammable, and
potentially explosive. Use proper fuel storage
and handling procedures. Do not store fuel
or other flammable materials nearby.
5. Have multiple ABC class fire extinguishers nearby.
6. Operation of this equipment may create sparks
that can start fires around dry vegetation. A spark
arrestor may be required. The operator should
contact local fire agencies for laws or regulations
relating to fire prevention requirements.
7. Set up and use only on a flat, level,
well-ventilated surface.
8. Use only lubricants and fuel recommended
in the engine manual or in the
Specifications chart of this manual.
9. Wear ANSI-approved safety glasses, hearing
protection, and NIOSH-approved dust mask/
respirator under a full face shield along
with steel-toed work boots during use.
10. Do not overreach. Keep proper footing and
balance at all times. This enables better control
of the equipment in unexpected situations.
11. Dress properly. Do not wear loose clothing or
jewelry. Keep hair, clothing and gloves away
from moving parts. Loose clothes, jewelry or
long hair can be caught in moving parts.
Engine Precautions
Follow engine precautions and instructions in the included engine instruction manual.
Personal Safety
1. Stay alert, watch what you are doing and
use common sense when operating this
compressor. Do not use this compressor
while you are tired or under the influence
of drugs, alcohol or medication. A moment
of inattention while operating a compressor
may result in serious personal injury.
2. Use personal protective equipment.
Always wear ANSI-approved eye
protection during setup and use.
3. Prevent unintentional starting.
Ensure the switch is in the off-position
before moving the compressor.

Page 4 For technical questions, please call 1-888-866-5797. Item 62913
SAFETY OPERATION MAINTENANCEINSTALLATION
Operating Precautions
1. CARBON MONOXIDE HAZARD
Using an engine indoors CAN KILL
YOU IN MINUTES.
Engine exhaust contains carbon
monoxide. This is a poison you cannot see or smell.
NEVER use inside a home or garage, EVEN IF
doors and windows are open.
Only use OUTSIDE and far away from windows,
doors, and vents.
2. Keep children away from the equipment,
especially while it is operating.
3. Fire Hazard! Do not fill gas tank while Compressor
engine is running. Do not operate if gasoline has
been spilled. Clean spilled gasoline before starting
engine. Do not operate near pilot light or open flame.
4. Do not touch Compressor engine during
use. Let engine cool down after use.
a. Do not use the compressor if the switch
does not turn it on and off. Any compressor
that cannot be controlled with the switch
is dangerous and must be repaired.
b. Store an idle compressor out of the reach
of children and do not allow persons
unfamiliar with the compressor or these
instructions to operate it. A compressor is
dangerous in the hands of untrained users.
5. Never store fuel or other flammable
materials near the Compressor engine.
6. Only use a suitable means of transport and
lifting devices with sufficient weight bearing
capacity when transporting the Compressor.
7. Secure the Compressor on transport vehicles to
prevent the tool from rolling, slipping, and tilting.
8. Use only accessories that are recommended
by Harbor Freight Tools for your model.
Accessories that may be suitable for one
piece of equipment may become hazardous
when used on another piece of equipment.
9. Parts, especially exhaust system components,
get very hot during use. Stay clear of hot parts.
10. Do not cover the engine or
equipment during operation.
11. Maintain the compressor. Keep the compressor
clean for better and safer performance. Follow
instructions for lubricating and changing
accessories. Keep 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
compressor’s operation. If damaged, have the
compressor repaired before use. Many accidents
are caused by a poorly maintained compressor.
12. Use the compressor in accordance with these
instructions, taking into account the working
conditions and the work to be performed. Use of
the compressor for operations different from those
intended could result in a hazardous situation.
13. Do not operate the equipment with known
leaks in the engine’s fuel system.
14. When spills of fuel or oil occur, they must be
cleaned up immediately. Dispose of fluids and
cleaning materials as per any local, state, or
federal codes and regulations. Store oil rags in
a bottom-ventilated, covered, metal container.
15. Keep hands and feet away from moving parts. Do
not reach over or across equipment while operating.
16. Before use, check for misalignment or binding
of moving parts, breakage of parts, and any
other condition that may affect the equipment’s
operation. If damaged, have the equipment
serviced before using. Many accidents are
caused by poorly maintained equipment.
17. Use the correct equipment for the application.
Do not modify the equipment and do not use the
equipment for a purpose for which it is not intended.

Page 5For technical questions, please call 1-888-866-5797.Item 62913
SAFETYOPERATIONMAINTENANCE INSTALLATION
Service Precautions
Have your compressor serviced by a qualified repair person using only identical
replacement parts. This will ensure that the safety of the compressor is maintained.
1. Before service, maintenance, or cleaning:
a. Turn the engine switch to its “OFF” position.
b. Allow the engine to completely cool.
c. Then, remove the spark plug
cap from the spark plug.
2. Keep all safety guards in place and in
proper working order. Safety guards include
muffler, air cleaner, mechanical guards,
and heat shields, among other guards.
3. Do not alter or adjust any part of the
equipment or its engine that is sealed by the
manufacturer or distributor. Only a qualified
service technician may adjust parts that may
increase or decrease governed engine speed.
4. Wear ANSI-approved safety goggles,
heavy-duty work gloves, and dust
mask/respirator during service.
5. Maintain labels and nameplates on
the equipment. These carry important
information. If unreadable or missing, contact
Harbor Freight Tools for a replacement.
6. Store equipment out of the reach of children.
7. Follow scheduled engine and
equipment maintenance.
Air Compressor Safety Warnings
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.
2. Risk of bursting - do not adjust regulator higher
than marked maximum pressure of attachment.
3. Risk of injury - do not direct air
stream at people or animals.
4. Do not use to supply breathing air.
5. Keep compressor well-ventilated.
Do not cover compressor during use.
6. Add correct amount of compressor oil before
first use and every use. Operating with the
incorrect amount of oil causes permanent
damage and voids warranty. To prevent
damage, do not use with overfilled or low oil.
7. Drain Tank daily and after use. Internal rust causes
tank failure and explosion.
8. Do not remove the valve cover or
adjust internal components.
9. Compressor head gets hot during operation.
Do not touch it or allow children nearby
during or immediately following operation.
10. Do not use the air hose to move the compressor.
11. Release the pressure in the
storage tank before moving.
12. The use of accessories or attachments not
recommended by the manufacturer may
result in a risk of injury to persons.
13. 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.
14. Industrial applications must follow OSHA guidelines.
15. Maintain labels and nameplates on the
compressor. These carry important safety
information. If unreadable or missing, contact
Harbor Freight Tools for a replacement.
16. This product is not a toy.
Keep it out of reach of children.
17. 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. Caution is necessary when
near the engine’s magneto or recoil starter.
18. WARNING: The brass components of this product
contain lead, a chemical known to the State
of California to cause cancer and birth defects
or other reproductive harm. (California Health
& Safety Code § 25249.5, et seq.)
19. WARNING: The cord of this product contains
lead and/or di (2-ethylhexyl) phthalate (DEHP),
chemicals known to the State of California
to cause cancer, and birth defects or other
reproductive harm. Wash hands after handling.
(California Health & Safety Code § 25249.5, et seq.)
SAVE THESE INSTRUCTIONS.

Page 6 For technical questions, please call 1-888-866-5797. Item 62913
SAFETY OPERATION MAINTENANCEINSTALLATION
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 is properly grounded. Do
not use the compressor if the power cord is damaged. If damaged, have it repaired by a service
facility before use.
Symbology
PSI Pounds per square inch of pressure
CFM Cubic Feet per Minute flow
SCFM Cubic Feet per Minute flow
at standard conditions
NPT National pipe thread, tapered
NPS National pipe thread, straight
RPM Revolutions Per Minute
HP Horsepower
WARNING marking concerning Risk
of Eye Injury. Wear ANSI-approved
safety goggles with side shields.
WARNING marking concerning
Risk of Respiratory Injury.
Operate engine OUTSIDE and far
away from windows, doors, and vents.
WARNING marking concerning
Risk of Explosion.
Specifications
Pump Two stage
Air Outlet Size 1/2″ -18 NPT
Air Pressure Shut-off 180 PSI
Restart 140 PSI
Air Tank Capacity 30 Gallons
Air Flow Capacity 18 SCFM @ 90 PSI
19.5 SCFM @ 40 PSI
Oil Capacity 57 oz. (1.7L)
Oil Type SAE 30 non-detergent
Air Compressor Oil
Required Rotation
viewed from PTO
(power takeoff - the output shaft)
Clockwise
Required Engine
Idle Speed 2000 RPM ± 100 RPM
Note: Engine specifications are found in the engine manual supplied with this equipment.

Page 7For technical questions, please call 1-888-866-5797.Item 62913
SAFETYOPERATIONMAINTENANCE INSTALLATION
Installation
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.
The emission control system for this Compressor’s Engine is warranted for standards set
by the U.S. Environmental Protection Agency and by the California Air Resources Board
(also known as CARB). For warranty information, refer to the engine manual.
Note: For additional information regarding the parts listed in the following pages,
refer to the Assembly Diagram near the end of this manual.
Functions
ON/OFF
Switch
Tank
Pressure
Gauge (76)
Tank Safety Valve (75)
Pilot Valve
Air Outlet (65)
Drain Valve (67)
Pump Safety Valve (6)
Oil Sight
Glass (41)
Belt Guard Frame (93) &
Belt Guard Cover (97)
Muffler
Assembly (8)
1. Belt Guard - The Belt Guard encloses the pulleys and drive belts.
It protects the user from the moving parts and allows the
large pulley to direct cooling air to the Air Pump.
2. Oil Sight Glass - The oil sight glass shows proper level of
the oil. Oil level should be at center of Sight Glass.
3. Tank Drain Valve - The Air Tank Drain Valve allows moisture
to be removed from the tank to prevent corrosion.
4. Safety Valve - The Safety Valve automatically releases air if the Air
Tank pressure exceeds the preset maximum. In an emergency, the
ring can be pulled to relieve tank air pressure. There is one
safety valve on the pump and one on the tank.
5. Air Outlet - An air hose attaches to this valve. Air pressure required by
tools is set by an air pressure regulator.
6. Air Storage Tank - The Air Tank is where air
pressurized by the Air Pump is stored for use.
7. Tank Pressure Gauge - The Air Tank Pressure
Gauge displays the air pressure in the tank.
8. Pilot Valve - Open the Pilot Valve before starting the engine.
It relieves resistance on the engine to make starting possible.
Rotate the pin so it is vertical to open it. Once the engine is running,
close the Pilot Valve so the Compressor can build up pressure.
Oil Sight Glass (41)
Crankcase (44)
OVERFILL
LOW
FULL
OIL LEVEL
Closed
Pilot Valve
Opened
Pilot Valve

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SAFETY OPERATION MAINTENANCEINSTALLATION
Mounting to a Truck Bed
1. Before mounting, if needed, reinforce the area with plywood or steel plating.
2. With assistance, move the compressor to the truck bed location and mark the floor of the truck
bed through the holes in the compressor’s feet. Check for any hidden wiring or cables and
adjust the location for the holes as needed. Then, temporarily set the compressor aside.
3. Drill the four 1/2″ diameter holes through the truck bed and any reinforcing materials.
4. Set the compressor back in place, and align the foot holes with the pre-drilled holes. Use four 1/2″
diameter, bolts, washers and lock washers (all not included) to secure the compressor in place.
Assembly
To install the Muffler Assembly (8), fit the Connector into
the Muffler Assembly and slide the assembly into the
hole on the side of the First Stage Cylinder Head (5).
Secure in place with the Wing Nut.
Breaking in the Compressor
1. Turn the Engine off.
Insert a male coupler (sold separately) into the female Quick Coupler and fully open all regulators and valves.
2. Check all fluid levels in the engine and pump.
3. Start the engine following the General Operating Instructions.
4. Let the unit run for 30 minutes. Air will expel freely through the Coupler.
5. Turn the Engine OFF.
6. Remove the male coupler.
Air Connection Setup
1. Connect a regulator valve, an inline shut off valve and a 1/4″ NPT air hose to the
Quick Coupler (all sold separately). The air hose must be long enough to reach the
work area with enough extra length to allow free movement while working.
Note: An in-line shutoff ball valve is an important safety device because it controls the air supply even
if the air hose is ruptured. The shutoff valve should be a ball valve because it can be closed quickly.
2. Depending on the tool that will be used with this compressor, incorporate additional components, such as
an in-line oiler, a filter, or a dryer (all sold separately), as shown on Figure A on page 9. Consult air
tool’s manual for needed accessories. See Typical Air Line Setup charts on the following pages.
This is a truckbed compressor, so use the portable setup as a model.
Muffler
Assembly (8)
Wing Nut
Connector
First Stage
Cylinder Head (5)

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SAFETYOPERATIONMAINTENANCE INSTALLATION
Figure A: Portable Air Supply Setup
G
A
E
E
H
F
B
Non-lubricated Tools Lubricated Tools
A
B
C
C
DA
Description Function
A Air Hose Connects air to tool
B Filter Prevents dirt and condensation from damaging tool or workpiece
C Regulator Adjusts air pressure to tool D Lubricator (optional) For air tool lubrication
E Coupler and Plug Provides quick connection and release
F Leader Hose (optional) Increases coupler life
G Air Cleaner / Dryer (optional) Prevents water vapor from damaging workpiece
H Air Adjusting Valve (optional) For fine tuning airflow at tool

Page 10 For technical questions, please call 1-888-866-5797. Item 62913
SAFETY OPERATION MAINTENANCEINSTALLATION
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.
Using the Compressor
Inspect Compressor, engine, pump and equipment looking for damaged, loose, and missing parts
before set up and starting. If any problems are found, do not use equipment until fixed properly.
Note: At the beginning of the day’s first use of the Air Compressor, check for air leaks by applying soapy water to
connections while the Air Compressor is pumping and after pressure cut-out. Look for air bubbles. If air bubbles
are present at connections, tighten connections. Do not use the air compressor unless all connections are air tight.
The extra air leaking out will cause the compressor to operate too often, increasing wear on the compressor.
Before starting the Compressor:
a. Follow the Set Up Instructions in the equipment manual to prepare the equipment.
b. Follow the Set Up Instructions in the Engine manual to prepare the engine.
c. Inspect all components of the setup. Make sure all nuts and bolts are tight.
d. Fill the Engine with the proper amount and type of both fuel and oil.
e. Fill the Compressor Pump with compressor oil following
the Maintenance Instructions in this manual.
To Start and Use the Compressor
1. Close the Drain Valve (67) by turning the lever
up so that it is perpendicular to the valve.
2. Close the in-line Shutoff Valve between
the compressor and the air hose.
3. Open the Pilot Valve by rotating it to a vertical position.
4. Open the Fuel Valve.
1
2
3
4

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SAFETYOPERATIONMAINTENANCE INSTALLATION
5. To start a cold engine, move the Choke to the START
(start/closed) position.
To restart a warm engine, leave the
Choke in the RUN position.
6. For MANUAL START
a. Turn the Engine Switch to ON.
ON
OFF START
ON
b. Grip the Starter Handle of the Engine loosely and
pull it slowly several times to allow the gasoline
to flow into the Engine’s carburetor. Then pull
the Starter Handle gently until resistance is felt.
Allow Cable to retract fully and then pull it quickly.
Repeat until the engine starts. Note: Do not let
the Starter Handle snap back against the engine.
Hold it as it recoils so it doesn’t hit the engine.
For ELECTRIC START
Turn the Engine Switch to START.
Note: To prolong starter life, use short starting
cycles (5 seconds maximum). Then wait one
minute before attempting to start again.
ON
OFF START START
Note: If engine does not start, check engine oil. Engine
will not start with low or no engine oil.
7. Allow the Engine to run for several seconds.
Then, if the Choke lever is in the START position,
move the Choke Lever very slowly to its RUN position.
Note: Moving the Choke Lever too fast could kill the engine.
8. Close the Pilot Valve by rotating it
to a horizontal position.
5
RUNSTART
RUNSTART
7
8

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SAFETY OPERATION MAINTENANCEINSTALLATION
9. When the Gas Engine is started and running, the
compressor Pump starts compressing air into the Air
Tank. Open the in-line Shutoff Valve and adjust the
Pressure Regulator (sold separately) 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 the
pressure and counterclockwise to decrease pressure.
Adjust the pressure gradually, while checking
the air output gauge to set the pressure.
IMPORTANT: Allow the engine to run for five minutes with no load
after each start-up so that the engine can stabilize.
Maintenance Break-in Period:
Breaking-in the engine will help to ensure proper equipment and engine operation.
The maintenance break-in period will last about 20 hours of use. After this period, change the engine oil.
Under normal operating conditions, subsequent maintenance follows the schedule
explained in the MAINTENANCE AND SERVICING section.
Note: When maximum tank pressure is reached, the compressor automatically disengages, and the engine
RPM drops down to idle speed. The engine remains at idle until Air Tank pressure falls to a preset level.
The Gas Engine will then accelerate and air pressure once again begins to build up in the Air Tank.
Note: As long as the engine is running, the operation of the Air Compressor
is automatic, controlled by an internal pressure switch.
IMPORTANT: The internal pressure switch is not user adjustable; do not make changes to the
air pressure settings of the internal pressure switch. Any change to the automatic pressure
levels may cause excess pressure to accumulate, causing a hazardous situation.
Note: Depressurization - If it is necessary to quickly depressurize the Compressor, turn OFF the engine.
Then, pull on the ring on the tank Safety Valve to release stored air pressure.
10. Use the air tool as needed.
11. After the job is complete, turn OFF the engine.
To stop the engine in an emergency, turn the Engine Switch off.
Under normal conditions, use the following procedure:
a. Turn the Engine Switch off.
b. Close the Fuel Valve.
9
10
OFF
ON
OFF START
11

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SAFETYOPERATIONMAINTENANCE INSTALLATION
12. Close the in-line Shutoff Valve.
13. Bleed air from the tool then disconnect the tool.
14. Open the Drain Valve at the bottom of the Tank,
to release any built-up moisture
and the internal tank pressure.
15. Clean, then store the Air Compressor inside a garage or another
area that provides protection from the elements..
Emergency Depressurization
If it is necessary to quickly depressurize the Compressor, turn the Power Switch OFF.
Then, pull on the ring on the Safety Valve to quickly release stored air pressure.
12
13
14

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SAFETY OPERATION MAINTENANCEINSTALLATION
Maintenance and Servicing
Procedures not specifically explained in this manual must
be performed only by a qualified technician.
TO PREVENT SERIOUS INJURY FROM ACCIDENTAL OPERATION:
Turn the Power Switch of the equipment to its “OFF” position, release tank air
pressure, wait for the engine to cool, and disconnect the spark plug cap before
performing any inspection, maintenance, or cleaning procedures.
TO PREVENT SERIOUS INJURY FROM COMPRESSOR 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 air compressor. Check for:
• loose hardware,
• misalignment or binding of moving parts,
• cracked or broken parts,
• damaged electrical wiring, and
• any other condition that may
affect its safe operation.
2. AFTER USE, wipe external surfaces of
the compressor with a clean cloth.
3. WARNING! If the supply cord of this
compressor is damaged, it must be replaced
only by a qualified service technician.
Compressor Pump Oil Maintenance
Check oil periodically for clarity. Replace oil if it appears
milky or if debris is present, or every 6 months, or
100 hours of runtime, whichever comes first. In harsh
environments such as high heat or high humidity,
you will need to replace the oil more frequently.
Change the compressor oil after the first
hour of use to remove any debris.

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SAFETYOPERATIONMAINTENANCE INSTALLATION
Adding Oil
1. The oil level should be at the center of the “full” level
on the Oil 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 below) and
do not overfill the oil so that it is above the center dot
(OVERFILL as shown below) on the Oil Sight Glass.
Oil Sight Glass (41)
Crankcase (44)
OVERFILL
LOW
FULL
OIL LEVEL
2. To add oil:
a. Remove the Oil Plug (46).
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 Plug.
Cold Weather Operation
Premium quality 30-weight, non-detergent air
compressor oil (sold separately) is recommended
for use with this compressor. Start compressor in
heated area if outdoor temperatures drop below
32° F. If this is not practical, drain out the old
pump oil and use L-PAB100-150 Non-detergent
Air Compressor Oil in the pump crankcase instead
whenever the compressor’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.
3. If uncertain which oil to use for this compressor,
please call Harbor Freight Tools customer
service at 1-888-866-5797 for assistance.
WARNING! To prevent serious injury from burns:
Do not add or change the oil while
the compressor is in operation.
Allow the compressor to cool before replacing oil.
Changing Oil
1. Place a container under the Drain Plug.
2. Remove the Oil Plug to allow air flow into the Pump.
3. Remove the Drain Plug, allowing the
oil to drain into the container.
4. When the oil is completely drained from
the Pump, replace the Drain Plug.
5. Fill the Pump with new compressor oil to
the FULL level on the Oil Sight Glass.
6. Replace and tighten the Oil Plug.
7. Discard the old oil according to local,
state and federal regulations.
Draining Moisture from the Tank
The Moisture Drain is located under the Tank.
It must be used daily to release all trapped air and
moisture from the Tank. Doing this will eliminate
condensation and prevent tank corrosion.
1. Turn the Power Switch of the compressor off.
2. Place a collection pan under the Moisture Drain.
3. Open the Moisture Drain two or three turns ONLY.
4. When all the pressure and moisture is released,
close the Moisture Drain.
Air Filter Maintenance
Check the Air Filter weekly to see if it needs
replacement. If working in dirty environments,
you may need to replace the filter more
often. To replace the Air Filter:
1. Unthread the Wing Nut holding the
Muffler Assembly in place.
2. Remove the Muffler Assembly.
3. Replace with a new Air Filter.
4. Secure in place with the Wing Nut.

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SAFETY OPERATION MAINTENANCEINSTALLATION
Adjusting Belt Tension
1. Remove the Belt Guard Cover (97) and set it aside.
Deflection
Distance
2. Press on the center of the longest span on each belt
with moderate finger pressure (4-4.5 lb.).
Then measure the deflection distance,
the distance that the belt moved.
The belt should deflect anywhere from 1/2″ to 1″.
Bottom Plate (85)
Nut (84)
Threaded Rod
(80)
Bolts (79)
Engine
Mounting
Bolts
Engine Base
3. If either belt deflects too much, tighten belts
by loosening the four Bolts (79) on the Bottom
Plate (85) and moving the engine away from the
other pulley slightly by turning the Nut (84) holding
the Threaded Rod (80). Secure engine mounting
bolts and retest tension. If either belt is too long to
be properly tensioned, both belts must be replaced.
4. If either belt deflects too little, loosen belts
by loosening the Bolts on the Bottom Plate and
moving the engine towards the other pulley slightly
by turning the Nut (84) on the Threaded Rod (80).
Secure engine mounting bolts and retest tension.
5. Before use, replace belt cover.
Maintenance Schedule
Following are general guidelines for
maintenance checks of the Air Compressor.
Note: The environment in which the compressor
is used, and the frequency of use will affect how
often you will need to check the Air Compressor
components and perform maintenance procedures.
Daily:
a. Make sure all nuts and bolts are tight.
b. Drain moisture from air tank.
c. Check for abnormal noise or vibration.
d. Check for air leaks.*
e. Wipe off any oil or dirt from the compressor.**
Weekly:
a. Inspect Air Filter.
Monthly:
a. Inspect Safety Valve.
* To check for air leaks, apply soapy water to joints while
the Air Compressor is pressurized. Look for air bubbles.
** To clean the compressor surface, wipe with
a damp cloth, using a mild detergent or mild solvent.

Page 17For technical questions, please call 1-888-866-5797.Item 62913
SAFETYOPERATIONMAINTENANCE INSTALLATION
Troubleshooting
Problem Possible Causes Likely Solutions
Engine will
not start
(Note: See engine
manual for engine
specific issues.)
COMPRESSOR SPECIFIC:
1. Pilot Valve closed.
2. Tank already pressurized.
COMPRESSOR SPECIFIC:
1. Open pilot valve before start procedure,
close after unit is running.
2. Turn engine on. Compressor will turn on as
needed when pressure reaches preset level.
Compressor
overheats
1. Incorrect lubrication or
not enough lubrication.
2. Worn parts.
1. Lubricate using recommended oil or
grease according to directions.
2. Have qualified technician inspect internal
mechanism and replace parts as needed.
Severe air
leakage
1. Poor air outlet seal.
2. Loose cylinder/cylinder head.
3. Damaged valve or housing.
4. Dirty, worn or damaged valve.
1. Tighten or re-attach using thread seal tape.
2. Tighten cylinder/cylinder head assembly.
If cylinder/cylinder head cannot tighten properly,
internal parts may be misaligned.
3. Replace damaged components.
4. Clean or replace valve assembly.
Unit stalls
1. Low engine idle.
2. Severely clogged air filter.
3. Improper lubrication.
4. Defective pilot/unloader valve.
1. Qualified technician should increase idle to
2,000±100 RPM by adjusting pressure switch.
2. Replace air filter.
3. Check for proper oil level.
4. Replace pilot valve.
Excessive noise
1. Loose drive pulley or flywheel.
2. Misaligned pulleys.
3. Lack of oil in crankcase.
4. Worn connecting rod.
5. Worn wrist pin bushing.
6. Worn bearings.
7. Loose belts.
1. Loose pulleys are a common cause of
“knocking”. Tighten appropriate bolts.
2. Align pulleys with straightedge and secure in place.
3. Check for proper oil level.
4. Replace connecting rod.
5. Remove piston assembly and replace necessary parts.
6. Replace bearings and oil.
7. Check for proper belt tension.
Oil in the
discharge air
1. Wrong type of oil or low-
quality oil.
2. Overheating.
3. Restricted intake air.
4. Worn piston rings.
5. Excessive moisture
in the tank.
1. Change oil. Check oil recommendations
under EQUIPMENT SET UP, Equipment
Oil Fill section of this manual.
2. See above Excessive Noise section.
3. Clean or replace air filter.
4. Replace piston rings.
5. Drain moisture from the tank daily.
Low discharge
pressure
1. Air leaks.
2. Leaking valves.
3. Restricted air intake.
4. Blown gaskets.
5. Slipping belts.
1. Listen for escaping air. Apply soap solution
to all fittings and connections. Bubbles will
appear at points of leakage. Tighten or
replace leaking fittings or connections.
2. Remove head and inspect for valve breakage,
weak valves, scored valve plate, etc. Replace
defective parts and reassemble. Replace head
gasket each time the head is removed.
3. Clean or replace air filter element.
4. Replace and gaskets proven faulty on inspection.
5. Tighten Belts (See monthly maintenance.)
Follow all safety precautions whenever diagnosing or servicing the equipment or engine.

Page 18 For technical questions, please call 1-888-866-5797. Item 62913
SAFETY OPERATION MAINTENANCEINSTALLATION
Part Description Qty
1 Exhaust Elbow 3
2 Spring Washer 8
3 Bolts M10×50 8
4 Tube 1
5First Stage Cylinder
Head (Iron) 2
6 Safety Valve 1
7T-Type Exhaust Tee 1
8 Muffler 2
8-1 Muffler Aluminium
Joint 1
8-2 Muffler Gasket 1
8-3 Muffler Seat 1
8-4 Air Filter 1
8-5 Muffler Cover 1
8-6 Flat Washer 1
8-7 Wing Nut M6 1
9Cylinder Head
Sealing Gasket 2
10 Valve Plate Assembly 2
10-1 Bolt M5×12 2
10-2 Spring Washer 2
10-3 Lift Limiter 1
10-4 Exhaust Valve Piece 1
10-5 Valve Plate 1
10-6 Intake Valve Slice 1
10-7 Cylindrical Pin Ø3×8 2
10-8 Spring Sheet 1
11 Valve Plate Seal 2
12 Bolts M10×25 12
13 Spring Washer 25
14 Cylinder 2
15 Cylinder Seal 3
16 Piston Ring Ø90 2
17 Hole Circlip Ø20 4
18 Piston Pin Ø20×80 2
19 Piston (Aluminum) 2
20 Connecting Rod
(Oblique) 1
21 Connecting Rod
(Straight) 1
22 Tube 1
Part Description Qty
23 Bolts M8×50 4
24 Spring Washer 4
25 Second Stage
Cylinder Head 1
26 Cylinder Head Gasket 1
27 Valve Plate 2
28 Valve Plate
Aluminum Seal 1
29 Valves 2
30 Valve Plate Seal 1
31 Cylinder 1
32 Piston Ring 1
33 Hole Circlip 2
34 Piston (Iron) 1
35 Piston Pin 1
36 Connecting Rod 1
37 Bolts M6×20 4
38 Spring Washer 4
39 Small Square
Back Cover 1
40 Back Cover Gasket 1
41 Oil Sight Glass 1
42 Oil Sight Gasket 1
43 Drain Plug 1
44 Crankcase 1
45 Oil Plug Seal 1
46 Oil Plug 1
47 Bearing 1
48 Shaft Circlips Ø30 1
49 Shoulder Ring 1
50 Crankshaft 1
51 Woodruff Key 1
52 Bearing 1
53 Oil Seal 1
54 Front Cover Gasket 1
55 Front Cover 1
56 Breathing Gasket 1
57 Connecting Rod (Iron) 1
58 Breathing 1
59 Spring Washer 6
60 Bolt M8×25 6
61 Belt Pulley 1
62 Pulley Retaining Ring 1
Part Description Qty
63 Bolt M10×35 1
64 Exhaust Tube 1
65 Air Outlet 1
66 Tank 1
67 Drain Valve 1
68 Nut M10 12
69 Flat Washer 12
70 Bolt M10×35 4
71 Combination Valve 1
72 Elbow 1
73 Unloading Tube 1
74 Throttle Push Rod 1
75 Safety Valve 1
76 Tank Pressure Gauge 1
77 Copper Tee 1
78 Wiring Stake 2
79 Bolt M10×35 4
80 Threaded Rod 1
81 Tense Card 1
82 Flat Washer 1
83 Spring Washer 1
84 Nut M12 1
85 Bottom Plate 1
86 Socket Cap Screw 4
87 Gasoline Engine 1
88 Gasoline Engine
Pulley 1
89 Pulley Retainer Ring 1
90 Spring Washer 1
91 Bolt 3/8″×1-1/2 1
92 V-Belt 2
93 Belt Guard Frame 1
94 Flat Washer 13
95 Spring Washer 13
96 Bolt M8×20 13
97 Belt Guard Cover 1
98 Belt Guard Bracket 1
99 Bolt M6×16 1
100 Standard Spring
Washer 1
101 Flat Washer 1
102 Nut 1
103 Belt Guard Bracket 1
Parts List and Diagram
Parts List
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 19For technical questions, please call 1-888-866-5797.Item 62913
SAFETYOPERATIONMAINTENANCE INSTALLATION
Assembly Diagram

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.
Limited 90 Day Warranty
Harbor Freight ToolsHarbor Freight ToolsHarbor Freight ToolsHarbor Freight ToolsHarbor 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 • 1-888-866-5797