HIGH-VOLUME 12VDC
AIR COMPRESSOR
66399
SEt UP AnD OPERAtInG InStRUCtIOnS
Read this material before using this product.
Failure to do so can result in serious injury.
SAVE tHIS MAnUAL.
©
®
Copyright 2008 by Harbor Freight Tools . All rights reserved. No portion of this manual or any artwork
contained herein may be reproduced in any shape or form without the express written consent of
Harbor Freight Tools. Diagrams within this manual may not be drawn proportionally. Due to continuing
improvements, actual product may differ slightly from the product described herein. Tools required for
assembly and service may not be included.
For technical questions or replacement parts, please call 1-800-444-3353.
Revised Manual 10d
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c. Keep bystanders, children, and
visitors away while operating the
tool. Distractions are able to result in
the loss of control of the tool.
b. Do not use the tool if the switch
does not turn the tool on or off.
Any tool that cannot be controlled
with the switch is dangerous and
must be repaired.
Personal safety
c. Disconnect the tool from the air
source before making any adjust-
ments, changing accessories, or
storing the tool. Turn the switch to
its off position and disconnect from
the battery.
a. Stay alert. Watch what you are do-
ing and use common sense when
operating the tool. Do not use the
tool while tired or under the influ-
ence of drugs, alcohol, or medica-
tion. A moment of inattention while
operating the tool increases the risk
of injury to persons.
d. Store the tool when it is idle out of
reach of children and other un-
trained persons. A tool is dangerous
in the hands of untrained users.
b. Avoid unintentional starting. be
sure the switch is off before con-
necting to the air supply. Do not
carry the tool with your finger on the
switch or connect the tool to the air
supply with the switch on.
e. Maintain the tool with care.
f.
Check for misalignment or bind-
ing of moving parts, breakage of
parts, air leaks, frayed wires, and
any other condition that affects the
tool’s operation. If damaged, have
the tool serviced before using. Many
accidents are caused by poorly main-
tained tools. There is a risk of burst-
ing if the tool is damaged.
c. Do not overreach. keep proper
footing and balance at all times.
Proper footing and balance enables
better control of the tool in unexpect-
ed situations.
d.
Always wear eye protec-
tion. Wear ANSI-ap-
proved safety goggles.
g. Use only accessories that are
identified by the manufacturer for
the specific tool model. Use of an
accessory not intended for use with
the specific tool model, increases the
risk of injury to persons.
e.
Always wear hearing
protection when using
the tool. Prolonged expo-
sure to high intensity noise
Service
is able to cause hearing loss.
a. Tool service must be performed
tool use and care
only by qualified repair personnel.
a. Do not force the tool. Use the
correct tool for the application. The
correct tool will do the job better and
safer at the rate for which the tool is
designed.
b. When servicing a tool, use only
identical replacement parts. Use
only authorized parts.
SKU 66399
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c. Use only the lubricants supplied
with the tool or specified by the
manufacturer.
Specific Safety Instructions
1. Do not use cigarette lighter adap-
tor to power this unit. If powered
with the battery of a vehicle, start and
run engine during inflation period.
SAVE tHESE
InStRUCtIOnS.
2. The warnings and precautions dis-
cussed in this manual cannot cover
all possible conditions and situations
that may occur. It must be under-
stood by the operator that common
sense and caution are factors which
cannot be built into this product, but
must be supplied by the operator.
SYMbOLS AnD
SPECIFIC SAFEtY
InStRUCtIOnS
Symbol Definitions
3. WARNING: Some dust created by
power sanding, sawing, grinding, drill-
ing, and other construction activities,
contains chemicals known [to the
State of California] to cause cancer,
birth defects or other reproductive
harm. Some examples of these
chemicals are:
Symbol
Property or statement
No-load speed
n
o
Revolutions or reciprocation per
minute
.../min
PSI
Pounds per square inch of pressure
Foot-pounds of torque
ft-lb
• Lead from lead-based paints
• Crystalline silica from bricks and
cement or other masonry products
• Arsenic and chromium from chemi-
cally treated lumber
Your risk from these exposures var-
ies, depending on how often you do
this type of work. To reduce your
exposure to these chemicals: work in
a well ventilated area, and work with
approved safety equipment, such as
those dust masks that are specially
designed to filter out microscopic
particles. (California Health & Safety
Code § 25249.5, et seq.)
Blows per minute
bPM
CFM
SCFM
nPt
Cubic Feet per Minute flow
Cubic Feet per Minute flow at
standard conditions
National pipe thread, tapered
National pipe thread, straight
nPS
WARNING marking concerning Risk
of Eye Injury. Wear ANSI-approved
eye protection.
WARNING marking concerning Risk
of Hearing Loss. Wear hearing
protection.
WARNING: The brass components
of this product contain lead, a chemi-
cal known to the State of California
to cause birth defects (or other repro-
ductive harm). (California Health &
Safety code § 25249.5, et seq.)
WARNING marking concerning Risk
of Respiratory Injury. Wear NIOSH-
approved dust mask/respirator.
WARNING marking concerning Risk
of Explosion.
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4. Only use with accessories rated to
handle the forces exerted by this tool
during operation. Other accessories
not designed for the forces gener-
ated may break and forcefully launch
pieces.
FUnCtIOnAL DESCRIPtIOn
Specifications
Maximum Air Pressure 115 PSI
Fills Car Tire in Approx.
3 Minutes
Speed
5. Attach all accessories properly to the
tool before connecting the air sup-
ply. A loose accessory may detach or
break during operation.
1.3 SCFM @ 40 PSI
Air Flow
0.9 SCFM @ 90 PSI
Rated Air Pressure
Maximum Power
0-115
12VDC, 30 AMPS
Do not add oil or any
other lubricant
Permanently Lubricated
Vibration Precautions
This tool vibrates during use. Re-
peated or long-term exposure to vibra-
tion may cause temporary or permanent
physical injury, particularly to the hands,
arms and shoulders. To reduce the risk of
vibration-related injury:
InItIAL tOOL SEt UP/
ASSEMbLY
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.
Anyone using vibrating tools regu-
larly or for an extended period should
first be examined by a doctor and
then have regular medical check-
ups to ensure medical problems are
not being caused or worsened from
use. Pregnant women or people
who have impaired blood circulation
to the hand, past hand injuries, ner-
vous system disorders, diabetes, or
Raynaud’s Disease should not use
this tool. If you feel any symptoms
related to vibration (such as tingling,
numbness, and white or blue fingers),
seek medical advice as soon as pos-
sible.
note: For additional information regarding
the parts listed in the following pages,
refer to the Assembly Diagram near
the end of this manual.
Unpacking
When unpacking, make sure that
the item is intact and undamaged. If any
parts are missing or broken, please call
Harbor Freight Tools at the number shown
throughout the manual as soon as pos-
sible.
WARnInG! tHE MEtAL PARtS OF
tHE COMPRESSOR AnD HOSES
WILL bECOME HOt DURInG USE.
• This air tool may be shipped with a
protective plug covering the air inlet.
Remove this plug before set up.
note: Air flow, and therefore tool perfor-
mance, can be hindered by under-
sized air supply components.
SAVE tHESE
InStRUCtIOnS.
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1. The air hose must be long enough
to reach the work area with enough
extra length to allow free movement
while working.
2. Route the air hose along a safe route
to reach the work area without creat-
ing a tripping hazard or exposing the
air hose to possible damage. The air
hose must be long enough to reach
the work area with enough extra
length to allow free movement while
working.
2. Turn the tool’s On/Off switch to the
“OFF” position; refer to Operation
section for description of controls.
3. Inspect the air connections for leaks.
Repair any leaks found.
General Assembly and Operating
Instructions
OPERAtInG InStRUCtIOnS
1. Set tool on a dry, flat, level surface.
Read the EntIRE IMPORtAnt
SAFEtY InFORMAtIOn
2. To prevent accidents, turn the On/Off
Switch (25) to the “OFF” position.
section at the beginning of this
manual including all text under
subheadings therein before set
up or use of this product.
3. Attach the quick coupler of coiled Air
Hose (59) to male connector at the
end of Rubber Hose (53).
4. nOtE: Be sure to pull back on collar
of Air Hose’s coupler. Then firmly
insert connector into coupler. (See
Figure 1.) Release collar, which will
snap connector in place. Pull lightly
on both hoses to ensure proper
locking in the coupler.
Inspect tool before use, looking
for damaged, loose, and
missing parts. If any problems
are found, do not use tool until
repaired.
tool Set Up
Air House (59)
Coupler Collar
tO PREVEnt
SERIOUS InjURY:
Do not adjust or tamper with
any control or component in a
way not specifically explained
within this manual. Improper
adjustment can result in tool
failure or other serious
hazards.
Male
Connector
Fig. 1
Work Piece and Work Area Set Up
5. Attach the clamps on the Power Cord
(27) onto the 12V automotive battery
(not included) power source.
1. Designate a work area that is clean
and well-lit. The work area must not
allow access by children or pets to
prevent distraction and injury.
a. Connect RED clamp of the Com-
pressor to the positive (+) terminal of
the battery.
REV 10a
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b. Connect BLACK terminal of the
Compressor to a good ground
source on the engine block.
WARnInG! Do nOt connect it to
the other battery terminal.
c. note: The power source must not
exceed 12V.
6. WARnInG! Failure to follow the fol-
lowing steps can lead to a blown
fuse.
7. Be sure the valve stem is clean and
free of dirt.
Fig. 3
8. Flip the On/Off Switch (25) to the
“ON” position. (See Fig. 2.)
12. Continue inflating until the recom-
mended pressure is reached.
13. Stop the compressor by clicking the
On/Off Switch to its “OFF” position.
On/Off Switch (25)
14. Remove the Air Nozzle by
unthreading it from the valve stem.
nOtE: In the case of a football or
soccer ball, pull the Needle Nozzle
(63), out of the ball valve orifice.
nOtE: After disconnecting the Com-
pressor, it is advisable to verify tire
pressure with a tire pressure gauge
(not included).
Fuse (26)
Fig. 2
9. Holding the Air Nozzle Grip (56),
thread the Air Nozzle (55) onto the
valve stem of the item to be inflated,
or attach an alternate Inflator Nozzle
(61,62,63).
nOtE: Remember to replace the
valve cap, where applicable.
15. If the tire pressure is low, repeat the
steps beginning with Step 7.
10. nOtE: When inflating, finger-tighten
16. Remove the clamps from the power
source.
Air Nozzle only. Do not over-tighten.
11. Monitor the Pressure Gauge carefully
to avoid over-inflating the item. (See
Fig. 3, above.)
WARnInG! tHE MEtAL PARtS OF tHE
COMPRESSOR AnD HOSES WILL
bECOME HOt DURInG USE.
REV 09f, 09h; 10a; 10d
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tO PREVEnt SERIOUS
InjURY FROM tOOL
FAILURE: Do not use
damaged equipment. If
abnormal noise, vibration,
or leaking air occurs, have
the problem corrected before
further use.
Cleaning, Maintenance and
Lubrication
note: These procedures are in addition to
the regular checks and maintenance
explained as part of the regular op-
eration of the Air Compressor.
Fig. 3
17. Allow this compressor to cool, then
wipe down and replace into the stor-
age bag supplied with this unit. (See
Fig. 3.) note: There is also a small
storage bag for inflator nozzles that is
attached to the Rubber Hose.
1. Wipe down the compressor with a
clean dry cloth.
2. Check the hoses to be sure there are
no cracks or worn areas.
18. Store in a dry location.
3. Rotate Filter counterclockwise and
remove from the compressor. Gently
pry the cover from the threaded end.
Remove the filter, wash in warm wa-
ter and liquid soap (no harsh powder
soap), rinse thoroughly, and let dry
USER-MAIntEnAnCE
InStRUCtIOnS
Procedures not specifically
explained in this manual
must be performed only by a
qualified technician.
4. Insert back into the filter holder. Align
the three indexing ribs on filter hous-
ing with the three recessed grooves
in the filter cover and push the cover,
snapping it onto the housing. Thread
the assembly back into the front cov-
er, being careful not to cross thread it.
tO PREVEnt
SERIOUS InjURY
FROM ACCIDEntAL
OPERAtIOn: turn off the tool,
detach the Power supply
clamps, safely discharge any
residual air pressure in the
tool, and release the throttle
and/or turn the switch to its
off position before performing
any inspection, maintenance,
or cleaning procedures.
5. Lubricate the Shaft (30) and Piston
Ring (31) after using 20 times.
a. Remove four Screws (4) holding the
Front Cover (5) in place and slide
the Front Cover off. (See Assembly
Diagram.)
b. Put a drop or two of machine oil on
the Shaft (30) and Piston Ring (31).
REV 10a
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Note: Turn the Compressor upside
down to allow the oil to penetrate
onto the piston rings.
inflator nozzle bag, and slide Fuse
holder back into slot. Fasten back
into place with screws.
c. Slide the Front Cover back on and
secure in place with the four screws.
8. When the tool needs servicing, it
should only be serviced by a qualified
technician.
6. If the Fuse (26) needs to be replaced,
snap off Fuse cover and then remove
and replace Fuse.
7. Slide out Fuse holder, replace old
Fuse with new Fuse included in the
troubleshooting
Problem
Possible Causes
Likely Solutions
Decreased output. 1. Not enough air pressure and/ 1. Check for loose connections.
or air flow.
2. Blocked air inlet Filter (3).
2. Clean air inlet screen of buildup.
3. Air leaking from loose housing 3. Make sure housing and connections are
or connections.
properly assembled and tight.
4. Mechanism contaminated.
4. Have qualified technician clean and where
possible, lubricate mechanism.
Severe air
leakage.
(Slight air leakage
is normal,
especially on older
tools.)
1. Cross-threaded housing
components.
1. Check for incorrect alignment and uneven
gaps. If cross-threaded, disassemble and
replace damaged parts before use.
2. Loose housing.
2. Tighten housing assembly. If housing cannot
be tightened properly, internal parts may be
misaligned.
3. Damaged valve or housing.
3. Replace damaged components.
4. Dirty, worn or damaged valve. 4. Clean or replace valve assembly.
No output
1. Poor clamp connection.
1. Clean clamps and reconnect properly.
2. Power Switch in Off (O)
position.
2. Turn Power Switch to On (I) position.
3. Run-down battery.
4. Blown Fuse.
3. Recharge battery.
4. Replace Fuse.
Follow all safety precautions whenever diagnosing or servicing the
tool. Disconnect from inflated item before service.
REV 10d
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PARtS LISt
PARtS LISt
Part
1
Description
Base Board
Qty.
1
4
1
4
1
4
1
1
1
1
4
1
1
1
1
1
1
1
2
2
4
1
1
4
1
1
1
2
1
1
1
1
1
1
1
1
Part
Description
Qty.
1
2
2
2
1
1
1
4
4
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
37 Air Storage Cap
38 Seal Ring
2
Pad
39 Air Exhaust
3
Filter
40 Rivet
4
Screw 4x8
Front Cover
Screw 5x14
Ring
41 Seal Ring
5
42 Radiation Cover
43 Cylinder Cover 1
44 Spring Washer
45 Screw 5x50
6
7
8
Offset Wheel
Front End Cover
9
46 Cylinder Cover 2
47 Screw 4x12
10 Decorative Ring
11 Nut
48 Triangle Bracket 1
49 Air Hose
12 Bearing 6201z
13 Armature
50 Handle
14 Bearing 608z
15 Motor Cover
16 Brush Bracket
17 Motor Cover Board
18 Temperature Controler
19 Spring Washer
20 Screw 5x150
21 Nut
51 Triangle Bracket 2
52 Air Hose Connector
53 Rubber Hose
54 Air Hose Connector
55 Air Nozzle
56 Air Nozzle Gripe
57 Rubber Hose
58 Pressure Gauge
59 Air Hose
22 Decorative Ring
23 Rear Cover
24 Screw 5x14
25 Switch
60 Quick Connector
61 Inflator Nozzle 1
62 Inflator Nozzle 2
63 Needle Nozzle
26 Fuse Holder
27 Power Cord
28 Clamp
29 Bearing 6201z
30 Shaft
ACCESSORY LISt
Part Description
61 Inflator Nozzle 1 Medium size fill orifice
Function
31 Piston Ring
32 Pressing Ring
33 Air Inlet Valve Slice
34 Rivet
62 Inflator Nozzle 2 Small size fill orifice
63 Needle Nozzle
Inflate balls
26A Fuse, Blade Type Overload Protection
35 Cylinder Liner
36 Seal Ring
REV 10a
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ASSEMbLY DIAGRAM
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LIMItED 1 YEAR WARRAntY
Harbor Freight Tools Co. makes every effort to assure that its products meet high
quality and durability standards, and warrants to the original purchaser that this product
is free from defects in materials and workmanship for the period of one year from the
date of purchase (90 days if used by a professional contractor or if used as rental equip-
ment). 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 ap-
ply to you. THIS WARRANTY IS ExPRESSLY IN LIEU OF ALL OTHER WARRANTIES,
ExPRESS OR IMPLIED, INCLUDING THE WARRANTIES OF MERCHANTABILITY
AND FITNESS.
To take advantage of this warranty, the product or part must be returned to us with
transportation charges prepaid. Proof of purchase date and an explanation of the com-
plaint must accompany the merchandise. If our inspection verifies the defect, we will ei-
ther repair or replace the product at our election or we may elect to refund the purchase
price if we cannot readily and quickly provide you with a replacement. We will return re-
paired products at our expense, but if we determine there is no defect, or that the defect
resulted from causes not within the scope of our warranty, then you must bear the cost
of returning the product.
This warranty gives you specific legal rights and you may also have other rights
which vary from state to state.
3491 Mission Oaks Blvd. • PO Box 6009 • Camarillo, CA 93011 • (800) 444-3353
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 avail-
able individually as replacement parts.
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.
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