Central Pneumatic CentralPneumatic 68064 Installation manual

2 HP, 4 GALLON, 125 PSI
TWIN TANK AIR COMPRESSOR
Model 68064
SET UP AND OPERATING INSTRUCTIONS
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.

Page 2 For technical questions, please call 1-800-444-3353. SKU 68064
CONTENTS
IMPORTANT SAFETY
INFORMATION ............................ 3
GENERAL COMPRESSOR
SAFETY WARNINGS.......................3
AIR COMPRESSOR SAFETY
WARNINGS......................................5
GROUNDING ................................. 6
110-120 V~ GROUNDED
COMPRESSORS:
COMPRESSORS WITH THREE
PRONG PLUGS...............................6
SYMBOLOGY.....................................7
SPECIFICATIONS.......................... 8
UNPACKING .................................. 8
INSTRUCTIONS FOR PUTTING
INTO USE .................................... 8
FUNCTIONS .......................................8
WORK PIECE AND WORK AREA
SET UP ............................................9
ASSEMBLY.........................................9
SET UP ...............................................9
CHECKING THE OIL........................10
GENERAL OPERATING
INSTRUCTIONS ........................ 11
EMERGENCY
DEPRESSURIZATION................... 12
AUTOMATIC SHUT OFF SYSTEM ..12
MAINTENANCE AND
SERVICING ............................... 13
CLEANING, MAINTENANCE, AND
LUBRICATION ............................... 13
MAINTENANCE SCHEDULE...........13
OIL MAINTENANCE.........................14
DRAINING MOISTURE FROM THE
TANK..............................................14
AIR FILTER MAINTENANCE ...........15
TROUBLESHOOTING......................16
PARTS LIST................................. 18
ASSEMBLY DIAGRAM................ 19
LIMITED 1 YEAR / 90 DAY
WARRANTY .............................. 20

Page 3For technical questions, please call 1-800-444-3353.SKU 68064
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.
IMPORTANT SAFETY
INFORMATION
In this manual, on the labeling,
and all other information
provided with this product:
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.
DANGER indicates
a hazardous
situation which, if not
avoided, will result in death or
serious injury.
WARNING
indicates a
hazardous situation which, if
not avoided, could result in
death or serious injury.
CAUTION, used
with the safety
alert symbol, indicates a
hazardous situation which, if
not avoided, could result in
minor or moderate injury.
NOTICE is used to
address practices
not 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, re and/or serious injury.
Save all warnings and
instructions for future reference.
1. Work area safety
a.Keep work area clean and well
lit. Cluttered or dark areas invite
accidents.
b.Do not operate the Compressor in
explosive atmospheres, such as in
the presence of ammable liquids,
gases or dust. Compressor motors
produce sparks which may ignite the
dust or fumes.
c. Keep children and bystanders
away from an operating
compressor.
2. Electrical safety
a.Compressor plugs must match
the outlet. Never modify the
plug in any way. Do not use any
adapter plugs with a grounded
compressor. Standard plugs and

Page 4 For technical questions, please call 1-800-444-3353. SKU 68064
matching outlets will reduce risk of
electric shock.
b.Do not expose the compressor
to rain or wet conditions. Water
entering a compressor will increase
the risk of electric shock.
c. Do not abuse the cord. Never use
the cord for pulling or unplugging
the compressor. Keep cord
away from heat, oil, sharp edges
or moving parts. Damaged or
entangled cords increase the risk of
electric shock.
3. Personal safety
a.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 inuence
of drugs, alcohol or medication. A
moment of inattention while operating
a compressor may result in serious
personal injury.
b.Use personal protective
equipment. Always wear eye
protection. Safety equipment such
as a dust mask, non-skid safety
shoes, hard hat, or hearing protection
used for appropriate conditions will
reduce personal injuries.
c. Prevent unintentional starting.
Ensure the switch is in the off-
position before connecting to
power source or moving the
compressor.
d.Only use safety equipment
that has been approved by an
appropriate standards agency.
Unapproved safety equipment may
not provide adequate protection. Eye
protection must be ANSI-approved
and breathing protection must be
NIOSH-approved for the specic
hazards in the work area.
4. Compressor use and care
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.Disconnect the plug from the
power source of the compressor
before making any adjustments,
changing accessories, or storing
it. Such preventive safety measures
reduce the risk of starting the
compressor accidentally.
c. 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.
d.Maintain the compressor. Keep
the compressor clean for better
and safer performance. Following
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.
e.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.

Page 5For technical questions, please call 1-800-444-3353.SKU 68064
5. Service
a.Have your compressor serviced
by a qualied repair person using
only identical replacement parts.
This will ensure that the safety of the
compressor is maintained.
Air Compressor Safety Warnings
1. Risk of re or explosion - Do not
spray ammable liquid in a conned
area or towards a hot surface. Spray
area must be well-ventilated. Do not
smoke while spraying or spray where
spark or ame 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 maximum
stated pressure of attachment.
3. Risk of injury - Do not direct air
stream at people or animals.
4. To reduce the risk of electric shock,
do not expose to rain. Store indoors.
5. Wear ANSI-approved safety goggles
during use.
6. Do not use to supply breathing air.
7. Do not use the air hose to move the
compressor.
8. Drain Tank daily and after use.
Internal rust causes tank failure and
explosion.
9. Add correct amount of compressor
oil before rst use and every
use. Operating with the incorrect
amount of oil causes permanent
damage and voids warranty. To
prevent damage, do not use with
overlled or low oil. Slowly ll to
full line, wait 2 minutes and ll
back up to full line. Compressor
has small passages that will ll
slowly.
10. Do not remove the Pressure Switch
(63) cover or adjust the internal
components.
11. Compressor head gets hot during
operation. Do not touch it or allow
children nearby during or immediately
following operation.
12. Release the pressure in the storage
tank before moving.
13. The use of accessories or
attachments not recommended by
the manufacturer may result in a risk
of injury to persons.
14. All air line components, including
hoses, pipe, connectors, lters, etc.,
must be rated for a minimum working
pressure of 125 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:
RECOMMENDED MINIMUM WIRE
GAUGE FOR EXTENSION CORDS
(120 VOLT)
NAMEPLATE
AMPERES
(at full load)
EXTENSION CORD
LENGTH
25’ 50’ 100’ 150’
0 – 6 18 16 16 14
6.1 – 10 18 16 14 12
10.1 – 12 16 16 14 12
12.1 – 16 14 12 Do not use.
TABLE A

Page 6 For technical questions, please call 1-800-444-3353. SKU 68064
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 overheating. Table A shows
the correct 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.
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.
18. This product is not a toy. Keep it out
of reach of children.
19. Operate unit on level surface. Check
oil level daily and ll to marked level if
needed.
20. People with pacemakers should
consult their physician(s) before
use. Electromagnetic elds 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. 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.
SAVE THESE
INSTRUCTIONS.
GROUNDING
TO PREVENT
ELECTRIC SHOCK
AND DEATH FROM
INCORRECT GROUNDING
WIRE CONNECTION:
Check with a qualied
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
t the outlet, have a proper
outlet installed by a qualied
electrician.
110-120 V~ Grounded
Compressors: Compressors with
Three Prong Plugs
1. In the event of a malfunction or
breakdown, grounding provides a

Page 7For technical questions, please call 1-800-444-3353.SKU 68064
path of least resistance for electric
current to reduce the risk of electric
shock. This compressor is equipped
with an electric cord having an
equipment-grounding conductor and
a grounding plug. The plug must be
plugged into a matching outlet that
is properly installed and grounded in
accordance with all local codes and
ordinances.
2. Do not modify the plug provided –
if it will not t the outlet, have the
proper outlet installed by a qualied
electrician.
3. Improper connection of the
equipment-grounding conductor can
result in a risk of electric shock. The
conductor with insulation having
an outer surface that is green with
or without yellow stripes is the
equipment-grounding conductor. If
repair or replacement of the electric
cord or plug is necessary, do not
connect the equipment-grounding
conductor to a live terminal.
4. Check with a qualied electrician or
service personnel if the grounding
instructions are not completely
understood, or if in doubt as to
whether the compressor is properly
grounded.
5. Use only 3-wire extension cords that
have 3-prong grounding plugs and
3-pole receptacles that accept the
compressor’s plug.
6. Repair or replace damaged or worn
cord immediately.
120 V~ 3-Prong Plug and Outlet
(for up to 120 V~ and up to 15.5 A)
Grounding
Pin
7. This compressor is intended for use
on a circuit that has an outlet that
looks like the one illustrated above
in 120 V~ 3-Prong Plug and Outlet.
The compressor has a grounding
plug that looks like the plug illustrated
above in 120 V~ 3-Prong Plug and
Outlet.
8. The outlet must be properly installed
and grounded in accordance with all
codes and ordinances.
9. Do not use an adapter to connect this
compressor to a different outlet.
Symbology
Canadian Standards Association
V~ Volts Alternating Current
AAmperes
n0xxxx/min. No Load Revolutions per Minute
(RPM)

Page 8 For technical questions, please call 1-800-444-3353. SKU 68064
SPECIFICATIONS
Electrical
Requirements 120 V~ / 60 Hz / 2 HP
Amperage 14A
Motor Speed 3450 RPM
Phase Single
Air Outlet Size 1/4”-18 NPT
Air Pressure Auto Shut-Off @ 125 PSI
Restart @ 95 PSI
Measured Air Tank
Capacity 4 Gallons
Stated Air Flow
Capacity
3.7 SCFM @ 90 PSI
5 SCFM @ 40 PSI
Oil Capacity 5.6 oz. (165ml)
Oil Type
SAE 30W non-detergent
Air Compressor Oil
(Sold separately)
(SKU 95048)
Decibel Level 90 dB @ 1m
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.
INSTRUCTIONS FOR
PUTTING INTO USE
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:
Turn the Power Lever “OFF”
and unplug the Air
Compressor from its electrical
outlet before assembling or
making any adjustments to
the compressor.
Note: For additional information regarding
the parts listed in the following pages,
refer to the Assembly Diagram near
the end of this manual.
Functions
Figure 1
Oil Sight
Glass
(35)
Pressure
Regulator
(85)
Tank Pressure
Gauge (83)
Output Pressure
Gauge (86)
Quick Coupler (84) -
For attaching in-line
shutoff valve, air
hose and tool
Drain Valve (71),
under bottom Tank
Tank Pressure
Gauge (83)
Output Pressure
Gauge (86)
Pressure
Regulator (85)
Quick Coupler
(84)
Control Panel
ON
OFF
ON/OFF
Power Lever Safety
Valve
(64)
Controls on side of unit

Page 9For technical questions, please call 1-800-444-3353.SKU 68064
Work Piece and Work Area Set Up
1. Designate a work area that is clean
and well-lit. The work area must not
allow access by children or pets to
prevent injury.
2. Locate the Compressor on a at
level surface to ensure proper pump
lubrication and to prevent damage to
the unit. Keep at least 12” of space
around the unit to allow air circulation.
3. Route the power cord from the
compressor to the grounded wall
outlet, along a safe path without
creating a tripping hazard or exposing
the power cord to possible damage.
Assembly
1.
Figure 2
Bolt (74)
Washer (75)
Wheel (73)
Tank (59)
Bushing (76)
Frame
Nut (77)
To attach the Wheels (73) to the
frame:
a. Slide the Washer (75), Wheel (73)
and Bushing (76) onto the Bolt (74).
b. Slide the Bolt through the frame hole
and secure in place with the Nut
(77).
c. Repeat steps 2 and 3 for the other
Wheel.
Set Up
1. Break in the new Air Compressor as
follows:
a. Check the oil level before operation.
Fill the Pump Crankcase (41) with
approximately 5.6 oz. of premium
quality SAE 30-weight, non-
detergent air compressor oil.
b. Make sure the Power Lever is OFF
and the unit is unplugged. Insert a
male coupler (sold separately) into
the Female Quick Coupler (84) and
fully open all regulators and valves.
c. Plug in the Power Cord.
d. Turn the Power Lever ON.
e. Let the unit run for 30 minutes. Air
will expel freely through the Coupler.
f. Turn the Power Lever OFF.
g. Unplug the Power Cord and remove
the male coupler.

Page 10 For technical questions, please call 1-800-444-3353. SKU 68064
2.
Quick
Coupler
Sample Air Line Setup
Regulator with
Pressure Gauge
Quick
Coupler Air Hose
on Reel
Shut
Off
Valve
FilterOiler
Coupler
Plug
Tool
Air
Compressor
Coupler
Plug
Connect a regulator valve, an in-line
shut off valve and a 1/4” NPT air hose
(all sold separately) to the Quick
Coupler (84). 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.
3. Depending on the tool which you will
be using with this compressor, you
may need to incorporate additional
components, such as an in-line oiler,
a lter, or a dryer (all sold separately).
Consult your air tool’s manual for
needed accessories.
Checking the Oil
1. Check the oil level before operation.
Fill the Pump Crankcase (41) with
approximately 5.6 oz. of premium
quality SAE 30-weight, non-detergent
air compressor oil.
IMPORTANT: Running the Air
Compressor with the incorrect
amount of oil will cause damage
to the equipment and void the
warranty. To prevent damage,
do not use with overlled or low
oil. Slowly ll to full line, wait 2
minutes and ll back up to full line.
Compressor has small passages
that will ll slowly.
2.
Oil Sight Glass (35)Crankcase Cover (33)
Wheel (73)
Figure 3
OVERFILL
LOW
FULL
OIL LEVEL
The oil level should be at the center
of the “full” level on the oil level sight
glass, as shown in Figure 3. 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 overll the oil so that it is
above the center dot (OVERFILL as
shown above) on the sight glass.
3. To add oil:
a. Remove the Oil Plug (39).
b. Using a funnel to avoid spills, pour
enough oil into the Pump Crankcase
(41) to reach the “full” level in the Oil
Sight Glass (35).
c. Replace the Oil Plug.
Cold Weather Operation
Premium quality 30-weight, non-
detergent air compressor oil (sold
separately) is recommended for

Page 11For technical questions, please call 1-800-444-3353.SKU 68064
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 SAE 10W 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.
4. If uncertain which oil to use for this
compressor, please call Harbor
Freight Tools customer service at
1-800-444-3353 for assistance.
5. Change the compressor oil after
the rst hour of use to remove any
debris.
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.
GENERAL 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.
1. Close the Drain Valve (71) by turning
it clockwise.
2. Make sure all nuts and bolts are tight.
3. Check for oil leaks and check the oil
level (See Checking the Oil).
4. Close the in-line Shutoff Valve
between the compressor and the air
hose.
5. Make sure the air tool’s throttle or
switch is in the off position.
6. Connect the air tool to the air hose.
7. Plug the Air Compressor Power Cord
into a grounded 120 V electrical
outlet.
8. Open the in-line Shutoff Valve.
9. Turn the Power Lever ON.
10. Allow the Air Compressor to build up
pressure until it cycles off.
Note: At the beginning of the day’s rst
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.
Note: As long as the Power Lever is ON,
the operation of the Air Compressor
is automatic, controlled by an internal
pressure switch. The Compressor will
turn on automatically when the air
pressure drops to 95 PSI as indicated
on the Tank Pressure Gauge (83),
and will turn off automatically when
the air pressure reaches 125 PSI
as indicated. IMPORTANT: The
internal pressure switch is not user
adjustable, do not make changes
to the air pressure settings of the
internal pressure switch. Any

Page 12 For technical questions, please call 1-800-444-3353. SKU 68064
change to the automatic pressure
levels may cause excess pressure
to accumulate, causing a hazardous
situation.
11. Adjust the Air Compressor’s Pressure
Regulator (85) 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 counter-
clockwise to decrease pressure.
Adjust the pressure gradually, while
checking the air output gauge to set
the pressure.
12. Use the air tool as needed.
13. After the job is complete, turn the
Power Lever OFF.
14. Unplug the Air Compressor.
15. Close the in-line Shutoff Valve.
16. Bleed air from the tool then
disconnect the tool.
17. Turn the Drain Valve (71), at the
bottom of the Tank, counterclockwise
to release any built-up moisture and
the internal tank pressure. Close the
valve after moisture has drained out.
Do not remove the Drain Valve.
18. Clean, then store the Air Compressor
indoors.
Emergency Depressurization
If it is necessary to quickly
depressurize the Compressor, turn
the Power Lever OFF. Then, pull on
the ring on the Safety Valve (64) to
quickly release stored air pressure.
Automatic Shut off System
1.
Reset
Button
Figure 4
If the Compressor automatically
shuts off, or hums then shuts off:
a. Shut off all tools.
b. Wait until the Compressor cools
down (about 10 minutes);
c. If the unit does not start up again
on it’s own, press the Reset
Button to start the compressor;
d. Resume operation.
2. Possible causes of repeated
automatic shut off of the compressor
are:
a. Using an extension cord that is too
long or narrow;
b. An air leak or open hose causing the
compressor to cycle too often and
build up heat.
c. Incorrect oil type for the ambient
working conditions.
3. Correct any issues before further use
to avoid damage to the compressor.

Page 13For technical questions, please call 1-800-444-3353.SKU 68064
MAINTENANCE AND
SERVICING
Procedures not specically
explained in this manual
must be performed only by a
qualied technician.
TO PREVENT
SERIOUS INJURY
FROM ACCIDENTAL
OPERATION:
Turn the Power Lever “OFF”
and unplug the Compressor
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 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 tool with a clean cloth.
3. WARNING! If the supply cord of
this power tool is damaged, it must
be replaced only by a qualied
service technician.
Maintenance Schedule
Following are general guidelines for
Air Compressor maintenance checks.
Note: The operating environment of the
compressor, and the frequency of use
can affect how often you will need
to check components and perform
maintenance procedures.
Daily:
a. Check oil level.
b. Check for oil leaks.
c. Make sure all nuts and bolts are
tight.
d. Drain moisture from air tank.
e. Check for abnormal noise or
vibration.
f. Check for air leaks.*
g. Wipe off any oil or dirt from the
compressor.**
Weekly:
a. Inspect Air Filter (2).
b. Inspect Oil Plug (39).
Monthly:
Inspect Safety Valve (64).
Every 6 months or 100 Operation
Hours:
Replace Pump oil.***
* 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.
*** Use Air Compressor Oil only (sold
separately - SKU 95048).

Page 14 For technical questions, please call 1-800-444-3353. SKU 68064
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 rst. In harsh environments
such as high heat or high humidity,
you will need to replace the oil more
frequently.
WARNING: Risk of personal injury hazard.
Allow Air Compressor to cool before
changing the oil.
To drain the oil from the Pump
Crankcase (41):
a. Place a container under the Drain
Plug (37).
b. Remove the Oil Plug (39) to allow air
ow into the Pump.
c. Remove the Drain Plug, allowing the
oil to drain into the container.
d. When the oil is completely drained
from the Pump, replace the Drain
Plug.
e. Fill the Pump with new compressor
oil to the FULL level on the Oil Sight
Glass (35).
f. Replace and tighten the Oil Plug.
g. Discard the old oil according to local,
state and federal regulations.
Draining Moisture from the Tank
The Drain Valve (71) is located under
the Tank (59). It must be accessed
daily to release all trapped air and
moisture from the Tank. This will
eliminate condensation which can
cause tank corrosion.
To empty the air and condensation:
a. Make sure the Power Lever of the
compressor is off.
b. Place a collection pan under the
Drain Valve.
c. Open the Drain Valve.
d. When all the pressure is released,
close the Drain Valve.
Counterclockwise
Drain Valve Open
Clockwise
Drain Valve Closed
Figure 7
Inside Compressor
Compressor Wall
Knob
To open the Drain Valve, turn
the knob on the bottom of the
Compressor counterclockwise.
To close the Drain Valve, turn
the knob on the bottom of the
compressor clockwise until you feel
tension and the knob is down as far
as it can go.

Page 15For technical questions, please call 1-800-444-3353.SKU 68064
Air Filter Maintenance
Figure 8
Air Filter (2)
Cylinder Head (8)
Check the Air Filter (2) weekly to see
if it needs replacement. If working in
dirty environments, you may need
to replace the lter more often. To
replace the Air Filter, unthread it from
the Cylinder Head (8) and replace it
with a new Air Filter.

Page 16 For technical questions, please call 1-800-444-3353. SKU 68064
Troubleshooting
Problem Possible Causes Likely Solutions
Compressor does
not start or restart
1. Incorrect power supply.
2. No power at outlet.
3. Power cord not plugged in
properly.
4. Thermal overload switch
tripped or Compressor circuit
breaker tripped.
5. Building power supply circuit
tripped or blown fuse.
6. Tank already pressurized.
7. Cord wire size is too small or
cord is too long to properly
power compressor.
8. Compressor needs service.
1. Check that circuit matches compressor requirements.
2. Reset circuit breaker, or have outlet serviced by a
qualied technician.
3. Check that cord is plugged in securely.
4. Turn off tool. Turn off Compressor and wait for it to cool
down. Press Reset Button. Resume operation.
5. Reset circuit or replace fuse. Check for low voltage
conditions. It may be necessary to disconnect other
electrical appliances from the circuit or move the
compressor to its own circuit.
6. Fully bleed tank of air.
7. Use larger diameter or shorter extension cord or
eliminate extension cord. See Recommended Wire
Gauge for Extension Cords in Safety section.
8. Have unit inspected by a qualied technician.
Compressor shuts
off automatically
before reaching full
pressure (Circuit
breaker trips)
1. Cold weather
2. Extension cord usage.
1. Turn off tool. Press the Reset Button. Start
Compressor in a heated area if temperatures drop
below 32ºF, or use SAE 10W non-detergent air
compressor oil instead of 30W.
2. Turn off tool. Press the Reset Button. Use without
extension cord.
Compressor
hums, then shuts
off automatically
before reaching full
pressure (Circuit
breaker trips)
1. Cold weather.
2. Extension cord usage.
3. Engine too hot.
1. Press the Reset Button, then, start Compressor in a
heated area if temperatures drop below 32ºF, or use
SAE 10W non-detergent air compressor oil instead of
30W.
2. Press the Reset Button. Use without extension cord.
3. Wait for engine to cool and unit will start automatically.
Compressor builds
pressure too slowly
1. Incorrect power supply.
2. Crankcase overlled with oil or
oil too thick.
3. Working environment too cold.
4. Safety valve needs service.
5. Loose ttings.
1. Check that circuit matches compressor requirements.
2. Drain oil and rell to proper level with recommended
oil.
3. Move unit to a warmer location. Check that
recommended oil is in crankcase.
4. Listen for air leaking from valve. If leaking replace with
identical valve with same rating.
5. Reduce air pressure, then check all ttings 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.
2. Crankcase oil too thick.
3. Check Valve needs service.
4. Compressor not large enough
for job.
5. Loose ttings.
6. Hose or hose connections not
adequate.
7. High altitude reducing air
output.
1. Check inlet and outlet lters. Clean and/or replace as
needed.
2. Drain oil and rell to proper level with recommended
oil.
3. Clean or replace, as needed.
4. Check if accessory SCFM is met by Compressor. If
Compressor cannot supply enough air ow (SCFM),
you need a larger Compressor.
5. Reduce air pressure, then check all ttings with a soap
solution for air leaks and tighten as needed. Do not
overtighten.
6. Replace with larger hose and/or hose connections.
7. You may need a larger compressor if you are situated
in a high altitude location.

Page 17For technical questions, please call 1-800-444-3353.SKU 68064
Problem Possible Causes Likely Solutions
High Oil
Consumption
1. Crankcase oil too thin.
2. Unit not on level surface.
3. Crankcase vents clogged.
1. Drain oil and rell to proper level with recommended
oil.
2. Reposition unit on a level surface.
3. Clean Crankcase vents.
Overheating 1. Filters need cleaning/replacing.
2. Crankcase oil too thin or
incorrect type.
3. Crankcase oil level too low.
4. Unusually dusty environment.
5. Cord is too small of a gauge or
too long to handle compressor.
6. Unit not on level surface.
1. Check inlet and outlet lters. Clean and/or replace as
needed.
2. Drain oil and rell to proper level with recommended
oil.
3. Add oil to proper level, check for leaks.
4. Clean and/or replace lters more often or move unit to
cleaner environment.
5. Increase cord size or use shorter length extension
cord, or eliminate extension cord. See Recommended
Wire Gauge for Extension Cords in Safety section.
6. Reposition unit on a level surface.
Compressor
starts and stops
excessively
1. Compressor not large enough
for job.
2. Loose ttings.
1. Check if accessory SCFM is met by Compressor. If
Compressor doesn’t reach accessory SCFM, you need
a larger Compressor.
2. Reduce air pressure, then check all ttings with a soap
solution for air leaks and tighten as needed. Do not
overtighten.
Excessive noise 1. Crankcase overlled with oil
or oil is incorrect thickness or
type.
2. Crankcase oil level too low.
3. Loose or damaged belt guard.
4. Loose ttings.
5. Unit not on level surface.
1. Drain oil and rell to proper level with recommended
oil.
2. Add oil to proper level, check for leaks.
3. Replace belt guard.
4. Reduce air pressure, then check all ttings with a soap
solution for air leaks and tighten as needed. Do not
overtighten.
5. Reposition unit on a level surface.
Moisture in
discharge air
Too much moisture in air. Install inline air lter/dryer, and/or relocate to less humid
environment.
Oil in discharge air 1. Crankcase oil too thin or
crankcase overlled with oil.
2. Crankcase vents clogged.
1. Drain oil and rell to proper level with recommended
oil.
2. Clean Crankcase vents.
Safety Valve “pops” Safety valve needs service. Pull on test ring of safety valve. If it still pops, replace.
Air leaks from pump
or ttings
Loose ttings. Reduce air pressure, then check all ttings with a soap
solution for air leaks and tighten as needed. Do not
overtighten.
Air leaks from tank Defective or rusted tank. Have tank replaced by a qualied technician.
Follow all safety precautions whenever diagnosing or servicing the
compressor. Disconnect power supply before service.
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.

Page 18 For technical questions, please call 1-800-444-3353. SKU 68064
Part Description Qty
1 Shroud 1
2 Air Filter 1
3 Valve 1
4 Washer 6 4
5 Spring Washer 6 12
6 Screw M6 x 50 4
7 Elbow Fitting 1
8 Cylinder Head 1
9 Head Gasket 1
10 Valve Plate 2
11 Metal Gasket 1
12 Valve 2
13 Valve Plate Gasket 1
14 Cylinder 1
15 Cylinder Screw M8 x 30 2
16 Spring Washer 3
17 Cylinder Gasket 1
18 Wrist Pin 1
19 Compression Ring 2
20 Oil Ring 1
21 Wrist Pin Retainer 2
22 Piston 1
23 Connecting Rod 1
24 Screw M6 x 20 7
25 Hex Nut M6 5
26 Crank Shaft 1
27 Tie 1
28 O-Ring 2
29 Capacitor 1
30 Bolt M8 x 16 1
31 Capacitor Bracket 1
32 Hex Nut M8 1
33 Crankcase Cover 1
34 O-Ring 1
35 Oil Sight Glass 1
36 O-Ring 1
37 Drain Plug 1
38 O-Ring 1
39 Oil Plug 1
40 Crankcase Cover Gasket 1
41 Crankcase 1
42 Washer 14
43 Bolt M5 x 16 10
44 Manual Overload Protector 1
45 Oil Seal 1
46 Bearing 1
47 Rotator 1
48 Bearing 1
49 Stator 1
50 Automatic Thermal Protector 1
Part Description Qty
51 Rear Bell 1
52 Fan 1
53 Circlip 1
54 Washer 4
55 Spring Washer 4
56 Bolt 4
57 Screw 4
58 Tray 1
59 Tank 1
60 Jacket 2
61 Grip 1
62 Handlegrip 1
63 Pressure Switch 1
64 Safety Valve 1
65 Coupler 1
66 Lining 6
67 Ferrule 6
68 Nut 6
69 Nylon Tube 1
70 Foot Pad 2
71 Drain Valve 1
72 Washer 10
73 Wheel 2
74 Bolt M10 x 50 2
75 Washer 2
76 Bushing 2
77 Nut M10 2
78 Screw M6 x 16 4
79 Rubber Cushion 4
80 Supporting Plate 1
81 Exhaust Tube 1
82 Check Valve 1
83 Tank Pressure Gauge 1
84 Quick Coupler 1
85 Pressure Regulator 1
86 Output Pressure Gauge 1
87 Elbow 3
88 Nylon Tube 1
89 Gauge Cover 2
90 Ferrule 1
91 Nut 1
92 Unloader Tube 1
93 Washer 4
94 Panel 1
95 Bolt M5 x 12 4
96 Nut M8 2
97 Bolt m6 x 35 4
98 Motor Cord 1
99 Plug 1
PARTS LIST

Page 19For technical questions, please call 1-800-444-3353.SKU 68064
ASSEMBLY DIAGRAM

Page 20 For technical questions, please call 1-800-444-3353. SKU 68064
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 workmanship
(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 directly
or indirectly to misuse, abuse, negligence or accidents, repairs or alterations outside
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 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 veries 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 specic 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 • [phone]
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.