Harbor Freight Tools 66399 User Manual

HIGH-VOLUME 12VDC

AIR COMPRESSOR

66399

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© 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

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.

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.

IMPORTANT SAFETY

Safety Alert Symbol and Signal

Words

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.

INSTRUCTIONS

INSTRUCTIONS PERTAINING

TO A RISK OF FIRE,

ELECTRIC SHOCK, OR

INJURY TO PERSONS

WARNING! THE METAL PARTS OF THE

COMPRESSOR AND HOSES WILL
BECOME HOT DURING USE.

WARNING – When using tools, basic pre-

cautions should always be followed,
including the following:

General

To reduce the risks of electric a.

shock, re, and injury to persons,

read all the instructions before us­ing the tool.

Work area

Keep the work area clean and well a.
lighted.

CAUTION, used

with the safety
alert symbol, indicates a
hazardous situation which, if
not avoided, could result in
minor or moderate injury.

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Do not operate the tool in explo-b.
sive atmospheres, such as in the

presence of ammable liquids,

gases, or dust. The tool is able to
create sparks resulting in the ignition
of the dust or fumes.

Keep bystanders, children, and c.
visitors away while operating the
tool. Distractions are able to result in

the loss of control of the tool.

Personal safety

Stay alert. Watch what you are do-a.
ing and use common sense when
operating the tool. Do not use the
tool while tired or under the inu­ence of drugs, alcohol, or medica­tion. A moment of inattention while

operating the tool increases the risk
of injury to persons.

Avoid unintentional starting. Be b.
sure the switch is off before con­necting to the air supply. Do not

carry the tool with your nger on the

switch or connect the tool to the air
supply with the switch on.

Do not overreach. Keep proper c.
footing and balance at all times.

Proper footing and balance enables
better control of the tool in unexpect­ed situations.

Do not use the tool if the switch b.
does not turn the tool on or off.

Any tool that cannot be controlled
with the switch is dangerous and
must be repaired.

Disconnect the tool from the air c.
source before making any adjust­ments, changing accessories, or
storing the tool. Turn the switch to

its off position and disconnect from
the battery.

Store the tool when it is idle out of d.
reach of children and other un­trained persons. A tool is dangerous

in the hands of untrained users.

Maintain the tool with care. e.

Check for misalignment or bind-f.
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 main­tained tools. There is a risk of burst­ing if the tool is damaged.

d. Always wear eye protec-

tion. Wear ANSI-ap­proved safety goggles.

e. Always wear hearing

protection when using
the tool. Prolonged expo-

sure to high intensity noise

is able to cause hearing loss.

Tool use and care

Do not force the tool. a. 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.

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Use only accessories that are g.

identied by the manufacturer for
the specic tool model. Use of an

accessory not intended for use with

the specic tool model, increases the

risk of injury to persons.

Service

Tool service must be performed a.

only by qualied repair personnel.

When servicing a tool, use only b.
identical replacement parts. Use
only authorized parts.

Use only the lubricants supplied c.

with the tool or specied by the

manufacturer.

SAVE THESE

INSTRUCTIONS.

SYMBOLS AND

SPECIFIC SAFETY

INSTRUCTIONS

Symbol Denitions

Specic Safety Instructions

Do not use cigarette lighter adap-1.
tor to power this unit. If powered

with the battery of a vehicle, start and

run engine during ination period.

The warnings and precautions dis-2.
cussed in this 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.

Symbol Property or statement

n

o

.../min

PSI

ft-lb

BPM

CFM

SCFM

NPT

NPS

No-load speed

Revolutions or reciprocation per
minute

Pounds per square inch of pressure

Foot-pounds of torque

Blows per minute

Cubic Feet per Minute ow

Cubic Feet per Minute ow at

standard conditions

National pipe thread, tapered

National pipe thread, straight

WARNING marking concerning Risk
of Eye Injury. Wear ANSI-approved
eye protection.

WARNING marking concerning Risk
of Hearing Loss. Wear hearing
protection.

WARNING marking concerning Risk
of Respiratory Injury. Wear NIOSH­approved dust mask/respirator.

WARNING marking concerning Risk
of Explosion.

WARNING: Some dust created by 3.
power sanding, sawing, grinding, drill­ing, 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:

• Lead from lead-based paints

• Crystalline silica from bricks and

cement or other masonry products

• Arsenic and chromium from chemi­cally treated lumber
Your risk from these exposures var­ies, 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 lter out microscopic

particles. (California Health & Safety
Code § 25249.5, et seq.)
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.)

SKU 66399 For technical questions, please call 1-800-444-3353. Page 4

Only use with accessories rated to 4.
handle the forces exerted by this tool
during operation. Other accessories
not designed for the forces gener­ated may break and forcefully launch
pieces.

Attach all accessories properly to the 5.
tool before connecting the air sup­ply. A loose accessory may detach or
break during operation.

Vibration Precautions

This tool vibrates during use. Re­peated or long-term exposure to vibra­tion may cause temporary or permanent
physical injury, particularly to the hands,
arms and shoulders. To reduce the risk of
vibration-related injury:

Anyone using vibrating tools regu-

larly or for an extended period should

rst 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 ngers),

seek medical advice as soon as pos-

sible.

WARNING! THE METAL PARTS OF

THE COMPRESSOR AND HOSES

WILL BECOME HOT DURING USE.

FUNCTIONAL DESCRIPTION

Specications

Maximum Air Pressure 115 PSI

Speed

Air Flow

Rated Air Pressure 0-115

Maximum Power 12VDC, 30 AMPS

Permanently Lubricated

Fills Car Tire in Approx.
3 Minutes

1.3 SCFM @ 40 PSI

0.9 SCFM @ 90 PSI

Do not add oil or any
other lubricant

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.

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 pos­sible.

This air tool may be shipped with a •
protective plug covering the air inlet.
Remove this plug before set up.

SAVE THESE

INSTRUCTIONS.

SKU 66399 For technical questions, please call 1-800-444-3353. Page 5

Note: Air ow, and therefore tool perfor-

mance, can be hindered by under-

sized air supply components.

1. 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.

Route the air hose along a safe route 2.
to reach the work area without creat­ing 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.

General Assembly and Operating

Instructions

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.

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

TO PREVENT

SERIOUS INJURY:
Do not adjust or tamper with
any control or component in a

way not specically explained

within this manual. Improper
adjustment can result in tool
failure or other serious
hazards.

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 distraction and injury.

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Set tool on a dry, at, level surface. 1.

To prevent accidents, turn the On/Off 2.
Switch (25) to the “OFF” position.

Attach the quick coupler of coiled Air 3.
Hose (59) to male connector at the
end of Rubber Hose (53).

NOTE: 4. Be sure to pull back on collar

of Air Hose’s coupler. Then rmly

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.

Attach the clamps on the Power Cord 5.
(27) onto the 12V automotive battery
(not included) power source.

Connect RED clamp of the Com-a.
pressor to the positive (+) terminal of
the battery.

Air House (59)
Coupler Collar

Male

Connector

Fig. 1

REV 10a

Connect BLACK terminal of the b.
Compressor to a good ground
source on the engine block.

WARNING! Do NOT connect it to
the other battery terminal.

Note: c. The power source must not

exceed 12V.

WARNING! Failure to follow the fol-6.
lowing steps can lead to a blown
fuse.

Be sure the valve stem is clean and 7.
free of dirt.

Fig. 3

Flip the On/Off Switch (25) to the 8.
“ON” position. (See Fig. 2.)

Continue inating until the recom-12.
mended pressure is reached.

On/Off Switch (25)

Stop the compressor by clicking the 13.
On/Off Switch to its “OFF” position.

Fuse (26)

Fig. 2

Remove the Air Nozzle by 14.
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 orice.

NOTE: After disconnecting the Com­pressor, it is advisable to verify tire
pressure with a tire pressure gauge

(not included).
Holding the Air Nozzle Grip (56), 9.
thread the Air Nozzle (55) onto the

valve stem of the item to be inated,

NOTE: Remember to replace the

valve cap, where applicable.

or attach an alternate Inator Nozzle

(61,62,63).

If the tire pressure is low, repeat the 15.

steps beginning with Step 7.
NOTE: 10. When inating, nger-tighten
Air Nozzle only. Do not over-tighten.

Remove the clamps from the power 16.

source.
Monitor the Pressure Gauge carefully 11.

to avoid over-inating 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

Fig. 3

17. Allow this compressor to cool, then
wipe down and replace into the stor­age bag supplied with this unit. (See
Fig. 3.) Note: There is also a small

storage bag for inator nozzles that is

attached to the Rubber Hose.

Store in a dry location. 18.

USER-MAINTENANCE

INSTRUCTIONS

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 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.

Note: These procedures are in addition to

the regular checks and maintenance
explained as part of the regular op­eration of the Air Compressor.

Wipe down the compressor with a 1.
clean dry cloth.

Check the hoses to be sure there are 2.
no cracks or worn areas.

Rotate Filter counterclockwise and 3.
remove from the compressor. Gently
pry the cover from the threaded end.
Remove the lter, wash in warm wa­ter and liquid soap (no harsh powder
soap), rinse thoroughly, and let dry

Insert back into the lter holder. Align 4.
the three indexing ribs on lter hous-

ing with the three recessed grooves

in the lter cover and push the cover,

snapping it onto the housing. Thread
the assembly back into the front cov­er, being careful not to cross thread it.

Lubricate the Shaft (30) and Piston 5.
Ring (31) after using 20 times.

Remove four Screws (4) holding the a.
Front Cover (5) in place and slide
the Front Cover off. (See Assembly
Diagram.)

Put a drop or two of machine oil on b.
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.

inator nozzle bag, and slide Fuse

holder back into slot. Fasten back
into place with screws.

Slide the Front Cover back on and c.
secure in place with the four screws.

If the Fuse (26) needs to be replaced, 6.

When the tool needs servicing, it 8.

should only be serviced by a qualied

technician.

snap off Fuse cover and then remove
and replace Fuse.

Slide out Fuse holder, replace old 7.
Fuse with new Fuse included in the

Troubleshooting

Problem Possible Causes Likely Solutions

Decreased output. Not enough air pressure and/1.

Severe air
leakage.
(Slight air leakage
is normal,
especially on older
tools.)

No output Poor clamp connection.1.

or air ow.

Blocked air inlet Filter (3).2.

Air leaking from loose housing 3.
or connections.

Mechanism contaminated. 4.

Cross-threaded housing 1.
components.

Loose housing. 2.

Damaged valve or housing.3.

Dirty, worn or damaged valve. 4.

Power Switch in Off (O) 2.
position.

Run-down battery.3.

Blown Fuse.4.

Check for loose connections1. .

Clean air inlet screen of buildup.2.

Make sure housing and connections are 3.
properly assembled and tight.

Have qualied technician clean and where 4.
possible, lubricate mechanism.
Check for incorrect alignment and uneven 1.
gaps. If cross-threaded, disassemble and
replace damaged parts before use.

Tighten housing assembly. If housing cannot 2.
be tightened properly, internal parts may be
misaligned.

Replace damaged components.3.

Clean or replace valve assembly.4.
Clean clamps and reconnect properly.1.

Turn Power Switch to On (I) position. 2.

Recharge battery.3.

Replace Fuse. 4.

Follow all safety precautions whenever diagnosing or servicing the

tool. Disconnect from inated item before service.

REV 10d

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PARTS LIST

PARTS LIST

Part Description Qty.

1 Base Board 1
2 Pad 4
3 Filter 1
4 Screw 4x8 4
5 Front Cover 1
6 Screw 5x14 4
7 Ring 1
8 Offset Wheel 1
9 Front End Cover 1

10 Decorative Ring 1
11 Nut 4
12 Bearing 6201z 1
13 Armature 1
14 Bearing 608z 1
15 Motor Cover 1
16 Brush Bracket 1
17 Motor Cover Board 1
18 Temperature Controler 1
19 Spring Washer 2
20 Screw 5x150 2
21 Nut 4
22 Decorative Ring 1
23 Rear Cover 1
24 Screw 5x14 4
25 Switch 1
26 Fuse Holder 1
27 Power Cord 1
28 Clamp 2
29 Bearing 6201z 1
30 Shaft 1
31 Piston Ring 1
32 Pressing Ring 1
33 Air Inlet Valve Slice 1
34 Rivet 1
35 Cylinder Liner 1
36 Seal Ring 1

Part Description Qty.

37 Air Storage Cap 1
38 Seal Ring 2
39 Air Exhaust 2
40 Rivet 2
41 Seal Ring 1
42 Radiation Cover 1
43 Cylinder Cover 1 1
44 Spring Washer 4
45 Screw 5x50 4
46 Cylinder Cover 2 1
47 Screw 4x12 1
48 Triangle Bracket 1 1
49 Air Hose 1
50 Handle 1
51 Triangle Bracket 2 1
52 Air Hose Connector 1
53 Rubber Hose 1
54 Air Hose Connector 1
55 Air Nozzle 1
56 Air Nozzle Gripe 1
57 Rubber Hose 1
58 Pressure Gauge 1
59 Air Hose 1
60 Quick Connector 1
61 Inator Nozzle 1 1
62 Inator Nozzle 2 1
63 Needle Nozzle 1

ACCESSORY LIST

Part Description Function

61 Inator Nozzle 1 Medium size ll orice

62 Inator Nozzle 2 Small size ll orice

63 Needle Nozzle Inate balls

26A Fuse, Blade Type Overload Protection

REV 10a

SKU 66399 For technical questions, please call 1-800-444-3353. Page 10

ASSEMBLY DIAGRAM

SKU 66399 For technical questions, please call 1-800-444-3353. Page 11

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 equip­ment). 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 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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