Harbor Freight Tools Central Pneumatic 66399 Installation manual

HIGH-VOLUME 12VDC
AIR COMPRESSOR
Model 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 10e

Page 2 For technical questions, please call 1-800-444-3353. SKU 66399
SAVE THIS MANUAL
Keep this manual for the safety warnings
and precautions, assembly, operating, inspec-
tion, 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.
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.
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.
IMPORTANT SAFETY
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 precau-
tions should always be followed, includ-
ing the following:
General
a. To reduce the risks of electric shock,
re, and injury to persons, read all the
instructions before using the tool.
Work area
a. Keep the work area clean and well
lighted.
b. Do not operate the tool in explosive
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.
c. Keep bystanders, children, and visi-
tors away while operating the tool.
Distractions are able to result in the loss
of control of the tool.
Personal safety
a. Stay alert. Watch what you are doing
and use common sense when operat-

Page 3For technical questions, please call 1-800-444-3353.SKU 66399
ing 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 in-
creases the risk of injury to persons.
b. Avoid unintentional starting. Be 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.
c. Do not overreach. Keep proper foot-
ing and balance at all times. Proper
footing and balance enables better con-
trol of the tool in unexpected situations.
d. Always wear eye protection.
Wear ANSI-approved safety
goggles.
e. Always wear hearing pro-
tection when using the tool.
Prolonged exposure to high
intensity noise is able to
cause hearing loss.
Tool use and care
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. 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.
c. Disconnect the tool from the air
source before making any adjust-
ments, changing accessories, or stor-
ing the tool. Turn the switch to its off
position and disconnect from the battery.
d. Store the tool when it is idle out of
reach of children and other untrained
persons. A tool is dangerous in the
hands of untrained users.
e. Maintain the tool with care.
f. Check for misalignment or binding
of moving parts, breakage of parts,
air leaks, frayed wires, and any other
condition that affects the tool’s op-
eration. If damaged, have the tool ser-
viced before using. Many accidents
are caused by poorly maintained tools.
There is a risk of bursting if the tool is
damaged.
g. Use only accessories that are identi-
ed by the manufacturer for the spe-
ci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
a. Tool service must be performed only
by qualied repair personnel.
b. When servicing a tool, use only identi-
cal replacement parts. Use only au-
thorized parts.
c. Use only the lubricants supplied with
the tool or specied by the manufac-
turer.
SAVE THESE
INSTRUCTIONS.

Page 4 For technical questions, please call 1-800-444-3353. SKU 66399
SYMBOLS AND SPECIFIC
SAFETY INSTRUCTIONS
Symbol Denitions
Symbol Property or statement
noNo-load speed
.../min Revolutions or reciprocation per
minute
PSI Pounds per square inch of pressure
ft-lb Foot-pounds of torque
BPM Blows per minute
CFM Cubic Feet per Minute ow
SCFM Cubic Feet per Minute ow at
standard conditions
NPT National pipe thread, tapered
NPS 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 NIOSH-
approved dust mask/respirator.
WARNING marking concerning Risk
of Explosion.
Specic Safety Instructions
1. THE METAL PARTS OF THE
COMPRESSOR AND HOSES WILL
BECOME HOT DURING USE.
2. Do not use cigarette lighter adaptor
to power this unit. If powered with the
battery of a vehicle, start and run engine
during ination period.
3. The warnings and precautions discussed
in this manual cannot cover all possible
conditions and situations that may oc-
cur. It must be understood by the opera-
tor that common sense and caution are
factors which cannot be built into this
product, but must be supplied by the
operator.
4. WARNING: Some dust created by
power sanding, sawing, grinding, drilling,
and other construction activities, con-
tains chemicals known [to the State of
California] to cause cancer, birth defects
or other reproductive harm. Some ex-
amples of these chemicals are:
• Lead from lead-based paints
• Crystalline silica from bricks and ce-
ment 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 ventilat-
ed 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 chemi-
cal known to the State of California to
cause birth defects (or other reproductive
harm). (California Health & Safety code
§ 25249.5, et seq.)
5. Only use with accessories rated to
handle the forces exerted by this tool
during operation. Other accessories not
designed for the forces generated may
break and forcefully launch pieces.
6. Attach all accessories properly to the tool
before connecting the air supply. A loose
accessory may detach or break during
operation.

Page 5For technical questions, please call 1-800-444-3353.SKU 66399
Vibration Precautions
This tool vibrates during use. Repeated
or long-term exposure to vibration may cause
temporary or permanent physical injury, par-
ticularly to the hands, arms and shoulders. To
reduce the risk of vibration-related injury:
Anyone using vibrating tools regularly
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 cir-
culation to the hand, past hand injuries,
nervous 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 possible.
SAVE THESE
INSTRUCTIONS.
SPECIFICATIONS
Maximum Air Pressure 115 PSI
Speed Fills Car Tire in Approx.
3 Minutes
Air Flow 1.3 SCFM @ 40 PSI
0.9 SCFM @ 90 PSI
Rated Air Pressure 0-115
Maximum Power 12VDC, 30 AMPS
Permanently Lubricated 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.
Note: Air ow, and therefore tool perfor-
mance, can be hindered by undersized
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.

Page 6 For technical questions, please call 1-800-444-3353. SKU 66399
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
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.
2. Route the air hose along a safe route 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
1. Set tool on a dry, at, level surface.
2. To prevent accidents, turn the On/Off
Switch (25) to the “OFF” position.
3. Attach the quick coupler of coiled Air
Hose (59) to male connector at the end
of Rubber Hose (53).
4.
Fig. 1
Air House (59)
Coupler Collar
Male
Connector
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.
5. Attach the clamps on the Power Cord
(27) onto the 12V automotive battery (not
included) power source.
a. Connect RED clamp of the Compressor
to the positive (+) terminal of the battery.
b. Connect BLACK terminal of the Com-
pressor 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 ex-
ceed 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.
REV 10a

Page 7For technical questions, please call 1-800-444-3353.SKU 66399
8.
Fig. 2
On/Off Switch (25)
Fuse (26)
Flip the On/Off Switch (25) to the “ON”
position. (See Fig. 2.)
Note: Turn unit on before connecting to
tire valve to prevent blowing the fuse.
9. Holding the Air Nozzle Grip (56), thread
the Air Nozzle (55) onto the valve stem
of the item to be inated, or attach an
alternate Inator Nozzle (61,62,63).
10. NOTE: When inating, nger-tighten Air
Nozzle only. Do not over-tighten.
11.
Fig. 3
Monitor the Pressure Gauge carefully to
avoid over-inating the item. (See Fig. 3,
above.)
12. Continue inating until the recommended
pressure is reached.
13. Stop the compressor by clicking the On/
Off Switch to its “OFF” position.
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 orice.
NOTE: After disconnecting the Compres-
sor, it is advisable to verify tire pressure
with a tire pressure gauge (not included).
NOTE: Remember to replace the valve
cap, where applicable.
15. If the tire pressure is low, repeat the
steps beginning with Step 7.
16. Remove the clamps from the power
source.
WARNING! THE METAL PARTS OF THE
COMPRESSOR AND HOSES WILL
BECOME HOT DURING USE.
17.
Fig. 4
Allow this compressor to cool, then wipe
down and replace into the storage bag
supplied with this unit. (See
Fig. 4.) Note: There is also a small
REV 09f, 09h; 10a; 10d, 10e

Page 8 For technical questions, please call 1-800-444-3353. SKU 66399
storage bag for inator nozzles that is
attached to the Rubber Hose.
18. Store in a dry location.
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.
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 operation
of the Air Compressor.
1. Wipe down the compressor with a clean
dry cloth.
2. Check the hoses to be sure there are no
cracks or worn areas.
3. Rotate Filter counterclockwise and
remove from the compressor. Gently
pry the cover from the threaded end.
Remove the lter, wash in warm water
REV 10a

Page 9For technical questions, please call 1-800-444-3353.SKU 66399
and liquid soap (no harsh powder soap),
rinse thoroughly, and let dry
4. Insert back into the lter holder. Align
the three indexing ribs on lter housing
with the three recessed grooves in the l-
ter 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.
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 Dia-
gram.)
b. Put a drop or two of machine oil on the
Shaft (30) and Piston Ring (31). Note:
Turn the Compressor upside down to
allow the oil to penetrate onto the piston
rings.
c. Slide the Front Cover back on and se-
cure in place with the four screws.
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 inator
nozzle bag, and slide Fuse holder back
into slot. Fasten back into place with
screws.
Troubleshooting
Problem Possible Causes Likely Solutions
Decreased output. 1. Not enough air pressure and/
or air ow.
2. Blocked air inlet Filter (3).
3. Air leaking from loose housing
or connections.
4. Mechanism contaminated.
1. Check for loose connections.
2. Clean air inlet screen of buildup.
3. Make sure housing and connections are
properly assembled and tight.
4. Have qualied technician clean and where
possible, lubricate mechanism.
Severe air
leakage.
(Slight air leakage
is normal,
especially on older
tools.)
1. Cross-threaded housing
components.
2. Loose housing.
3. Damaged valve or housing.
4. Dirty, worn or damaged valve.
1. Check for incorrect alignment and uneven
gaps. If cross-threaded, disassemble and
replace damaged parts before use.
2. Tighten housing assembly. If housing cannot
be tightened properly, internal parts may be
misaligned.
3. Replace damaged components.
4. Clean or replace valve assembly.
No output 1. Poor clamp connection.
2. Power Switch in Off (O)
position.
3. Run-down battery.
4. Blown Fuse.
1. Clean clamps and reconnect properly.
2. Turn Power Switch to On (I) position.
3. Recharge battery.
4. Replace Fuse.
Follow all safety precautions whenever diagnosing or servicing the
tool. Disconnect from inated item before service.
REV 10d

Page 10 For technical questions, please call 1-800-444-3353. SKU 66399
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
Part Description Qty.
36 Seal Ring 1
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
PARTS LIST

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

Page 12 For technical questions, please call 1-800-444-3353. SKU 66399
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.
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.
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 this product is free from
defects in materials and workmanship for the period of 90 days from the date of purchase. This
warranty does not apply to damage due directly or indirectly, to misuse, abuse, negligence or
accidents, repairs or alterations outside our facilities, criminal activity, improper installation,
normal wear and tear, or to lack of maintenance. We shall in no event be liable for death,
injuries to persons or property, or for incidental, contingent, special or consequential damages
arising from the use of our product. Some states do not allow the exclusion or limitation of
incidental or consequential damages, so the above limitation of exclusion may not apply to
you. THIS WARRANTY IS EXPRESSLY IN LIEU OF ALL OTHER WARRANTIES, EXPRESS
OR IMPLIED, INCLUDING THE WARRANTIES OF MERCHANTABILITY AND FITNESS.
To take advantage of this warranty, the product or part must be returned to us with
transportation charges prepaid. Proof of purchase date and an explanation of the complaint
must accompany the merchandise. If our inspection 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]