2.5 HP, 21 GALLON, 125 PSI
CAST IRON VERTICAL
AIR COMPRESSOR
Model
67847
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.
CONTENTS
IMPORTANT SAFETY
INFORMATION ............................ 3
GENERAL COMPRESSOR
SAFETY WARNINGS.......................3
DRAINING MOISTURE FROM THE
TANK .............................................. 15
AIR FILTER MAINTENANCE ...........15
TROUBLESHOOTING ......................16
PARTS LIST ................................. 18
AIR COMPRESSOR SAFETY
WARNINGS ......................................5
GROUNDING ................................. 6
110-120 V~ GROUNDED
COMPRESSORS:
COMPRESSORS WITH THREE
PRONG PLUGS ...............................7
SYMBOLOGY ..................................... 7
SPECIFICATIONS .......................... 8
UNPACKING .................................. 8
INSTRUCTIONS FOR PUTTING
INTO USE .................................... 8
FUNCTIONS ....................................... 8
WORK PIECE AND WORK AREA
SET UP ............................................9
ASSEMBLY/MOUNTING .................... 9
ASSEMBLY DIAGRAM ................ 19
LIMITED 1 YEAR / 90 DAY
WARRANTY .............................. 20
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 ........... 14
OIL MAINTENANCE .........................14
Page 2 For technical questions, please call 1-800-444-3353. SKU 67847
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
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
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
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.
Work area safety1.
Keep work area clean and well a.
lit. Cluttered or dark areas invite
accidents.
Do not operate the Compressor in b.
explosive atmospheres, such as in
the presence of ammable liquids,
gases or dust. Compressor motors
produce sparks which may ignite the
dust or fumes.
Keep children and bystanders c.
away from an operating
compressor.
Electrical safety2.
Compressor plugs must match a.
the outlet. Never modify the
plug in any way. Do not use any
adapter plugs with a grounded
compressor. Standard plugs and
Page 3For technical questions, please call 1-800-444-3353.SKU 67847
matching outlets will reduce risk of
electric shock.
NIOSH-approved for the specic
hazards in the work area.
Do not expose the compressor b.
to rain or wet conditions. Water
entering a compressor will increase
the risk of electric shock.
Do not abuse the cord. Never use c.
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.
Personal safety3.
Stay alert, watch what you are a.
doing and use common sense
when operating this compressor.
Do not use this compressor while
you are tired or under the inuence
of drugs, alcohol or medication. A
moment of inattention while operating
a compressor may result in serious
personal injury.
Use personal protective b.
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.
Prevent unintentional starting. c.
Ensure the switch is in the offposition before connecting to
power source or moving the
compressor.
Only use safety equipment d.
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
Compressor use and care4.
Do not use the compressor if the a.
switch does not turn it on and
off. Any compressor that cannot
be controlled with the switch is
dangerous and must be repaired.
Disconnect the plug from the b.
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.
Store an idle compressor out of c.
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.
Maintain the compressor. Keep d.
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.
Use the compressor in accordance e.
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 4 For technical questions, please call 1-800-444-3353. SKU 67847
Service5.
Have your compressor serviced a.
by a qualied repair person using
only identical replacement parts.
This will ensure that the safety of the
compressor is maintained.
Air Compressor Safety Warnings
overlled 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.
Do not remove the Pressure Switch 10.
(54) cover or adjust the internal
components.
Risk of re or explosion - Do not 1.
spray ammable liquid in a conned
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.
Risk of bursting - Do not adjust 2.
regulator higher than maximum
stated pressure of attachment.
Risk of injury - Do not direct air 3.
stream at people or animals.
To reduce the risk of electric shock, 4.
do not expose to rain. Store indoors.
Wear ANSI-approved safety goggles 5.
during use.
Do not use to supply breathing air. 6.
Do not use the air hose to move the 7.
compressor.
Drain Tank daily and after use. 8.
Internal rust causes tank failure and
explosion.
Add correct amount of compressor 9.
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
Do not use the air hose to move the 11.
compressor.
Compressor head gets hot during 12.
operation. Do not touch it or allow
children nearby during or immediately
following operation.
Release the pressure in the storage 13.
tank before moving.
The use of accessories or 14.
attachments not recommended by
the manufacturer may result in a risk
of injury to persons.
All air line components, including 15.
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.
USE OF AN EXTENSION CORD 16.
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)
0 – 6 18 16 16 14
6.1 – 10 18 16 14 12
EXTENSION CORD
LENGTH
25’ 50’ 100’ 150’
TABLE A
Page 5For technical questions, please call 1-800-444-3353.SKU 67847
RECOMMENDED MINIMUM WIRE
GAUGE FOR EXTENSION CORDS
(120 VOLT)
NAMEPLATE
AMPERES
(at full load)
10.1 – 12 16 16 14 12
12.1 – 16 14 12 Do not use.
TABLE A
EXTENSION CORD
LENGTH
25’ 50’ 100’ 150’
cause pacemaker interference or
pacemaker failure.
WARNING: The brass components 22.
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.)
Make sure your extension cord is in a.
good condition.
Be sure to use an extension cord b.
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.
Industrial applications must follow 17.
OSHA guidelines.
Maintain labels and nameplates 18.
on the compressor. These carry
important safety information. If
unreadable or missing, contact
Harbor Freight Tools for a
replacement.
This product is not a toy. Keep it out 19.
of reach of children.
Operate unit on level surface. Check 20.
oil level daily and ll to marked level if
needed.
People with pacemakers should 21.
consult their physician(s) before
use. Electromagnetic elds in close
proximity to heart pacemaker could
The warnings, precautions, 23.
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 qualied
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
Page 6 For technical questions, please call 1-800-444-3353. SKU 67847
t the outlet, have a proper
outlet installed by a qualied
electrician.
110-120 V~ Grounded
Compressors: Compressors with
Three Prong Plugs
In the event of a malfunction or 1.
breakdown, grounding provides a
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.
Do not modify the plug provided – 2.
if it will not t the outlet, have the
proper outlet installed by a qualied
electrician.
Improper connection of the 3.
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.
Use only 3-wire extension cords that 5.
have 3-prong grounding plugs and
3-pole receptacles that accept the
compressor’s plug.
Repair or replace damaged or worn 6.
cord immediately.
Grounding
Pin
120 V~ 3-Prong Plug and Outlet
(for up to 120 V~ and up to 15.5 A)
This compressor is intended for use 7.
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.
The outlet must be properly installed 8.
and grounded in accordance with all
codes and ordinances.
Do not use an adapter to connect this 9.
compressor to a different outlet.
Symbology
Canadian Standards Association
Check with a qualied electrician or 4.
service personnel if the grounding
instructions are not completely
understood, or if in doubt as to
whether the compressor is properly
grounded.
V~
A
n0 xxxx/min.
Volts Alternating Current
Amperes
No Load Revolutions per Minute
(RPM)
Page 7For technical questions, please call 1-800-444-3353.SKU 67847
SPECIFICATIONS
Electrical
Requirements
Amperage
Motor Speed 3400 RPM
Phase Single
Air Outlet Size 1/4”-18 NPT
Air Pressure
Air Tank Capacity 21 Gallons
Air Flow Capacity
Oil Capacity 5.6 oz. (165ml)
Oil Type
Decibel Level 90 dB @ 1m
120 V~ / 60 Hz / 2.5 HP
14A (Dedicated circuit
recommended)
Auto Shut-Off @ 125 PSI
Restart @ 95 PSI
4.7 SCFM @ 90 PSI
5.8 SCFM @ 40 PSI
SAE 30W non-detergent
Air Compressor Oil
(Sold separately)
(SKU 95048)
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
ON/OFF Power Lever
(On Pressure Switch (54))
Oil Sight
Glass
(33)
Pressure
Regulator
(74)
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.
Safety
Valve
( 7 3 )
Tank Pressure
Drain Valve (66)
(Controls)
Pressure
Switch (54)
Safety
Valve
(73)
Figure 1
Gauge (53)
Output
Pressure
Gauge (77)
ON/OFF
OFF
Power
Lever
ON
Tank Pressure
Gauge (53)
Output Pressure
Gauge (77)
Pressure
Regulator
(74)
Quick
Coupler
(76)
Quick
Coupler
(76) - For
attaching
in-line
shutoff
valve, air
hose and
tool
Page 8 For technical questions, please call 1-800-444-3353. SKU 67847
Work Piece and Work Area Set Up
Designate a work area that is clean 1.
and well-lit. The work area must not
allow access by children or pets to
prevent injury.
Locate the Compressor on a at 2.
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.
Route the power cord from the 3.
compressor to the grounded wall
outlet, along a safe path without
creating a tripping hazard or exposing
the power cord to possible damage.
Assembly/Mounting
Handle (72)
Bolts (71)
Tank (70)
Figure 3
2. Slide the Handle (72) into the two
slots on the top of the Tank (70) and
secure in place with four Bolts (71).
Tank (70)
Nut (24)
Foot Pad (67)
Washer (68)
Screw (69)
Figure 2
Hex Nut (65)
Wheel (63)
Sleeve (64a)
Washer (64b)
Bolt (64)
1. Attach the Wheels (63) to the Tank
(70), using the Bolts (64), Washers
(64b), Sleeves (64a), and Hex Nuts
(65). Attach the Foot Pads (67) to
the bottom of the Tank (70) using the
Screws (69) and Washers (68).
Cylinder Head (7)
Air Filter
(6)
Figure 4
3. Thread the Air Filter (6) onto the side
of the Cylinder Head (7).
Break in the new Air Compressor as 4.
follows:
Make sure the Power Lever is OFF a.
and the unit is unplugged. Insert a
male coupler (sold separately) into
the female Quick Coupler (76) and
fully open all regulators and valves.
Plug in the Power Cord.b.
Page 9For technical questions, please call 1-800-444-3353.SKU 67847
Turn the Power Lever ON.c.
Let the unit run for 30 minutes. Air d.
will expel freely through the Coupler.
Turn the Power Lever OFF.e.
Unplug the Power Cord and remove f.
the male coupler.
Tool
Shut
Off
Valve
Quick
Coupler
Coupler
Plug
Quick
Coupler
FilterOiler
Regulator with
Pressure Gauge
Coupler
Plug
Air Hose
on Reel
Air
Compressor
Sample Air Line Setup
5. Connect a regulator valve, an in-line
shut off valve and a 1/4” NPT air hose
(all sold separately) to the Quick
Coupler (76). 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.
Checking the Oil
Check the oil level before operation. 1.
Fill the Pump Crankcase (39) with
premium quality SAE 30-weight, nondetergent 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 overlled 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.
Oil Sight Glass (33)Crankcase Cover (31)
OIL LEVEL
OVERFILL
FULL
LOW
Figure 5
2. The oil level should be at the center
of the “full” level on the oil level sight
glass, as shown in Figure 5. 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 overll the oil so that it is
above the center dot (OVERFILL as
shown above) on the sight glass.
Tank (70)
Depending on the tool which you will 6.
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
To add oil:3.
Remove the Oil Plug (37).a.
Using a funnel to avoid spills, pour b.
enough oil into the Pump Crankcase
(39) to reach the “full” level in the Oil
Sight Glass (33).
needed accessories.
Page 10 For technical questions, please call 1-800-444-3353. SKU 67847
Replace the Oil Plug.c.
Cold Weather Operation
Premium quality 30-weight, nondetergent 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 SAE 10W Nondetergent Air Compressor Oil in the
pump crankcase instead whenever
the compressor’s temperature will
fall below 40°. Do not use multiviscosity oil (such as 10W-30), they
leave carbon deposits on pump
components and lead to accelerated
failure. Heavy operation may require
heavier viscosity oil.
Close the Drain Valve (66) by turning 1.
it clockwise.
Make sure all nuts and bolts are tight.2.
Check for oil leaks and check the oil 3.
level (See Checking the Oil).
Close the in-line Shutoff Valve 4.
between the compressor and the air
hose.
Make sure the air tool’s throttle or 5.
switch is in the off position.
Connect the air tool to the air hose. 6.
Plug the Air Compressor Power Cord 7.
into a grounded 120 V electrical
outlet.
Open the in-line Shutoff Valve.8.
Turn the Power Lever ON. 9.
If uncertain which oil to use for this 4.
compressor, please call Harbor
Freight Tools customer service at
1-800-444-3353 for assistance.
Change the compressor oil after 5.
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.
Allow the Air Compressor to build up 10.
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 (53),
Page 11For technical questions, please call 1-800-444-3353.SKU 67847
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
change to the automatic pressure
levels may cause excess pressure
to accumulate, causing a hazardous
situation.
Adjust the Air Compressor’s Pressure 11.
Regulator (74) 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.
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 (73) to
quickly release stored air pressure.
Automatic Shut off System
Reset
Button
Use the air tool as needed.12.
After the job is complete, turn the 13.
Power Lever OFF.
Unplug the Air Compressor.14.
Close the in-line Shutoff Valve.15.
Bleed air from the tool then 16.
disconnect the tool.
Turn the Drain Valve (66), at the 17.
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.
Clean, then store the Air Compressor 18.
indoors.
Figure 6
1. If the Compressor automatically
shuts off, or hums then shuts off:
Shut off all tools.a.
Wait until the Compressor cools b.
down (about 10 minutes);
If the unit does not start up again c.
on it’s own, press the Reset
Button to start the compressor;
Resume operation.d.
Possible causes of repeated 2.
automatic shut off of the compressor
are:
Using an extension cord that is too a.
long or narrow;
Page 12 For technical questions, please call 1-800-444-3353. SKU 67847
An air leak or open hose causing the b.
compressor to cycle too often and
build up heat.
MAINTENANCE AND
SERVICING
Correct any issues before further use 3.
to avoid damage to the compressor.
Procedures not specically
explained in this manual
must be performed only by a
qualied 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
BEFORE EACH USE,1. 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
Page 13For technical questions, please call 1-800-444-3353.SKU 67847
any other condition that may affect its
safe operation.
AFTER USE,2. 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 qualied
service technician.
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 can affect how
often you will need to check the
Air Compressor components and
perform maintenance procedures.
Monthly:
Inspect Safety Valve (73).
Every 6 months or 100 Operation
Hours:
Replace Pump oil.
***
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.
Daily:
Check oil level.a.
Check for oil leaks.b.
Make sure all nuts and bolts are c.
tight.
Drain moisture from air tank.d.
Check for abnormal noise or e.
vibration.
Check for air leaks.f.
*
Wipe off any oil or dirt from the g.
compressor.
**
Weekly:
Inspect Air Filter (6).a.
Inspect Oil Plug (37).b.
* 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.
To drain the oil from the Pump
Crankcase (39):
Place a container under the Drain a.
Plug (35).
Remove the Oil Plug (37) to allow air b.
ow into the Pump.
Remove the Drain Plug, allowing the c.
oil to drain into the container.
When the oil is completely drained d.
from the Pump, replace the Drain
Plug.
Fill the Pump with new compressor e.
oil to the FULL level on the Oil Sight
Glass (33).
Replace and tighten the Oil Plug.f.
Discard the old oil according to local, g.
state and federal regulations.
*** Use Air Compressor Oil only (sold
separately - SKU 95048).
Page 14 For technical questions, please call 1-800-444-3353. SKU 67847
Draining Moisture from the Tank
Air Filter Maintenance
The Drain Valve (66) is located under
the Tank (70). 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:
Make sure the Power Lever of the a.
compressor is off.
Place a collection pan under the b.
Drain Valve.
Open the Drain Valve.c.
When all the pressure is released, d.
close the Drain Valve.
Counterclockwise
Drain Valve Open
Inside Compressor
Clockwise
Drain Valve Closed
Check the Air Filter 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:
Remove the Cover (1).a.
Remove the Air Filter (6).b.
Replace with a new Air Filter.c.
Replace the Cover.d.
Compressor Wall
Knob
Figure 7
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 67847
Troubleshooting
Problem Possible Causes Likely Solutions
Compressor does
not start or restart
Compressor shuts
off automatically
before reaching full
pressure (Circuit
breaker trips)
Compressor
hums, then shuts
off automatically
before reaching full
pressure (Circuit
breaker trips)
Compressor builds
pressure too slowly
Compressor not
building enough air
pressure
Incorrect power supply.1.
No power at outlet. 2.
Power cord not plugged in 3.
properly.
Thermal overload switch 4.
tripped or Compressor circuit
breaker tripped.
Building power supply circuit 5.
tripped or blown fuse.
Tank already pressurized.6.
Cord wire size is too small or 7.
cord is too long to properly
power compressor.
Compressor needs service.8.
Cold weather 1.
Extension cord usage.2.
Cold weather. 1.
Extension cord usage. 2.
Engine too hot.3.
Incorrect power supply.1.
Crankcase overlled with oil or 2.
oil too thick.
Working environment too cold. 3.
Safety valve needs service. 4.
Loose ttings.5.
Filters need cleaning/replacing. 1.
Crankcase oil too thick. 2.
Check Valve needs service.3.
Compressor not large enough 4.
for job.
Loose ttings. 5.
Hose or hose connections not 6.
adequate.
High altitude reducing air 7.
output.
Check that circuit matches compressor requirements.1.
Reset circuit breaker, or have outlet serviced by a 2.
qualied technician.
Check that cord is plugged in securely. 3.
Turn off tool. Turn off Compressor and wait for it to cool 4.
down. Press Reset Button. Resume operation.
Reset circuit or replace fuse. Check for low voltage 5.
conditions. It may be necessary to disconnect other
electrical appliances from the circuit or move the
compressor to its own circuit.
Fully bleed tank of air.6.
Use larger diameter or shorter extension cord or 7.
eliminate extension cord. See Recommended Wire
Gauge for Extension Cords in Safety section.
Have unit inspected by a qualied technician.8.
Turn off tool. Press the Reset Button. Start 1.
Compressor in a heated area if temperatures drop
below 32ºF, or use SAE 10W non-detergent air
compressor oil instead of 30W.
Turn off tool. Press the Reset Button. Use without 2.
extension cord.
Press the Reset Button, then, start Compressor in a 1.
heated area if temperatures drop below 32ºF, or use
SAE 10W non-detergent air compressor oil instead of
30W.
Press the Reset Button. Use without extension cord. 2.
Wait for engine to cool and unit will start automatically.3.
Check that circuit matches compressor requirements.1.
Drain oil and rell to proper level with recommended 2.
oil.
Move unit to a warmer location. Check that 3.
recommended oil is in crankcase.
Listen for air leaking from valve. If leaking replace with 4.
identical valve with same rating.
Reduce air pressure, then check all ttings with a soap 5.
solution for air leaks and tighten as needed. Do not
overtighten.
Check inlet and outlet lters. Clean and/or replace as 1.
needed.
Drain oil and rell to proper level with recommended 2.
oil.
Clean or replace, as needed.3.
Check if accessory SCFM is met by Compressor. If 4.
Compressor cannot supply enough air ow (SCFM),
you need a larger Compressor.
Reduce air pressure, then check all ttings with a soap 5.
solution for air leaks and tighten as needed. Do not
overtighten.
Replace with larger hose and/or hose connections. 6.
You may need a larger compressor if you are situated 7.
in a high altitude location.
Page 16 For technical questions, please call 1-800-444-3353. SKU 67847
Problem Possible Causes Likely Solutions
High Oil
Consumption
Overheating Filters need cleaning/replacing. 1.
Crankcase oil too thin. 1.
Unit not on level surface.2.
Crancase vents clogged.3.
Crankcase oil too thin or 2.
incorrect type.
Crankcase oil level too low. 3.
Drain oil and rell to proper level with recommended 1.
oil.
Reposition unit on a level surface.2.
Clean Crankcase vents.3.
Check inlet and outlet lters. Clean and/or replace as 1.
needed.
Drain oil and rell to proper level with recommended 2.
oil.
Add oil to proper level, check for leaks. 3.
Unusually dusty environment. 4.
Cord is too small of a gauge or 5.
too long to handle compressor.
Unit not on level surface.6.
Compressor
starts and stops
excessively
Excessive noise Crankcase overlled with oil 1.
Moisture in
discharge air
Oil in discharge air Crankcase oil too thin or 1.
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
Air leaks from tank Defective or rusted tank. Have tank replaced by a qualied technician.
Compressor not large enough 1.
for job.
Loose ttings.2.
or oil is incorrect thickness or
type.
Crankcase oil level too low.2.
Loose or damaged belt guard.3.
Loose ttings. 4.
Unit not on level surface.5.
Too much moisture in air. Install inline air lter/dryer, and/or relocate to less humid
crankcase overlled with oil.
Crankcase vents clogged.2.
Loose ttings. Reduce air pressure, then check all ttings with a soap
Clean and/or replace lters more often or move unit to 4.
cleaner environment.
Increase cord size or use shorter length extension 5.
cord, or eliminate extension cord. See Recommended
Wire Gauge for Extension Cords in Safety section.
Reposition unit on a level surface.6.
Check if accessory SCFM is met by Compressor. If 1.
Compressor doesn’t reach accessory SCFM, you need
a larger Compressor.
Reduce air pressure, then check all ttings with a soap 2.
solution for air leaks and tighten as needed. Do not
overtighten.
Drain oil and rell to proper level with recommended 1.
oil.
Add oil to proper level, check for leaks.2.
Replace belt guard.3.
Reduce air pressure, then check all ttings with a soap 4.
solution for air leaks and tighten as needed. Do not
overtighten.
Reposition unit on a level surface.5.
environment.
Drain oil and rell to proper level with recommended 1.
oil.
Clean Crankcase vents.2.
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.
Page 17For technical questions, please call 1-800-444-3353.SKU 67847
PARTS LIST
Part Description Qty
1 Cover 1
2 Elbow 1
3 Start Valve 1
4 Spring Washer M6 8
5 Screw M6 x 50 4
6 Air Filter 1
7 Cylinder Head 1
8 Head Gasket 1
9 Valve Plate 2
10 Metal Gasket 1
11 Valve 2
12 Valve Plate Gasket 1
13 Cylinder 1
14 Bolt M8 x 30 2
15 Spring Washer M8 3
16 Cylinder Gasket 1
17 Pin Ø 13 x 44 1
18 Compression Ring 2
19 Oil Ring 1
20 Wrist Pin Retainer 2
21 Piston 1
22 Connecting Rod 1
23 Screw M6 x 20 5
24 Hex Nut M6 3
25 Crank Shaft 1
26 O-Ring 2
26a Zip Tie 1
27 Capacitor 1
28 Screw M8 x 20 1
29 Capacitor Bracket 1
30 Hex Nut M8 1
31 Crank Case Cover 1
32 O-Ring 1
33 Oil Sight Glass 1
34 O-Ring 1
35 Drain Plug M5 x 10 1
36 O-Ring 1
37 Oil Plug 1
38 Crankcase Cover Gasket 1
39 Pump Crankcase 1
40 Washer M5 10
41 Screw M5 x 16 10
Part Description Qty
42 Manual Overload Protector 1
43 Oil Seal 1
44 Bearing 1
45 Rotator 1
46 Bearing 1
47 Stator 1
48 Automatic Thermal Protector 1
49 End Cover 1
50 Fan 1
51 Circlip 1
51a Plain Washer 5 4
51b Spring Washer 5 4
51c Bolt M5 x 130 4
52 Connector 1
53 Tank Pressure Gauge 1
54 Pressure Switch 1
55 Unloader Tube 1
56 Nut 1
57 Ferrule 1
58 Check Valve 1
59 Ferrule 2
60 Nut 2
61 Exhaust Tube 1
62 Cooling Fin 1
63 Wheel 2
64 Bolt M12 x 55 2
64a Sleeve 2
64b Washer 12 2
65 Hex Nut M12 2
66 Drain Valve 1
67 Foot Pad 2
68 Washer 2
69 Screw M6 x 25 2
70 Tank 1
71 Bolt M6 x 10 4
72 Handle 1
73 Safety Valve 1
74 Pressure Regulator 1
75 Motor Cord 1
76 Quick Coupler 1
77 Output Pressure Gauge 1
78 Plug 1
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 18 For technical questions, please call 1-800-444-3353. SKU 67847
ASSEMBLY DIAGRAM
a
a
b
b
Page 19For technical questions, please call 1-800-444-3353.SKU 67847
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 veries 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 specic 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
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 20 For technical questions, please call 1-800-444-3353. SKU 67847
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