Central Pneumatic Air Compressor 65903 User Manual
240 VOLT COMPRESSOR
4 HP PEAK – 29 GALLON
65903
SET UP AND OPERATING INSTRUCTIONS
Distributed exclusively by Harbor Freight Tools®.
3491 Mission Oaks Blvd., Camarillo, CA 93011
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 10g
PRODUCT SPECIFICATIONS
Motor
Overload Reset Button 15 A
Power Cord
Air Tank Capacity 29 Gallons
SCFM Airow
Compressor Pump Type Dual V-Head Cylinder / Belt Driven
Safety Valve Setting 120 PSI
Air Pressure Gauge Indicators 0-200 PSI in 5 PSI Increments
Automatic Shut Off Capability Shut Off at 115 PSI / Starts at 80 PSI
Required Air Quick Connector (Not Included) 1/4”-18 NPT Quick Connector
V-Belt Size A1118 Li
Base Mounting Holes Qty. 4 @ 1/2” Diameter
240 V~ / 60 Hz / 9 A (Load) / Single Phase / 4 HP Peak /
3 HP Working / 3,400 RPM / Two Capacitor (Run & Start)
12 Gauge, 3-Wire (Stripped), 10 Ft. Long
240 Volt Power Cord Plug Not Included.
8.74 @ 40 PSI / 7.7 @ 70 PSI /
7.47 @ 90 PSI / 6.67 @ 115 PSI
UNPACKING
When unpacking, check to make sure all the parts shown on the Parts List at the
end of the manual are included. If any parts are missing or broken, please call Harbor
Freight Tools at the number shown on the cover of this manual as soon as possible.
SAVE THIS MANUAL
You will need this manual for the safety warnings and precautions, assembly,
operating, inspection, maintenance and cleaning procedures, parts list and assembly
diagram. Keep your invoice with this manual. Write the invoice number on the inside
of the front cover. Keep this manual and invoice in a safe and dry place for future reference.
GENERAL SAFETY RULES
WARNING!
READ AND UNDERSTAND ALL INSTRUCTIONS
Failure to follow all instructions listed below may
result in electric shock, re, and/or serious injury.
SAVE THESE INSTRUCTIONS
WORK AREA
Keep your work area clean and well lit.1. Cluttered benches and dark areas invite
accidents.
SKU 65903 For technical questions, please call 1-800-444-3353. Page 2
Do not operate compressors in explosive atmospheres, such as in the pres-2.
ence of ammable liquids, gases, or dust. Compressors create sparks which
may ignite the dust or fumes.
Keep bystanders, children, and visitors away while operating a compressor. 3.
Provide barriers or shields as needed.
ELECTRICAL SAFETY
Grounded compressors must be plugged into an outlet properly installed 1.
and grounded in accordance with all codes and ordinances. Never remove
the grounding prong or modify the plug in any way. Do not use any adapter
plugs. Check with a qualied electrician if you are in doubt as to whether the
outlet is properly grounded. If the compressors should electrically malfunction
or break down, grounding provides a low resistance path to carry electricity away
from the user.
Do not expose compressors to rain or wet conditions. 2. Water entering an elec-
tric motor will increase the risk of electric shock.
Do not abuse the Power Cord.3. Never use the Power Cord to pull the Plug
from an outlet. Keep the Power Cord away from heat, oil, sharp edges, or
moving parts. Replace damaged Power Cords immediately. Damaged Power
Cords increase the risk of electric shock.
AN EXTENSION CORD MUST 4. NEVER BE USED WITH THIS ITEM. Connecting
this item to an outlet through an extension cord MAY CAUSE ELECTRICAL
DAMAGE TO THE MOTOR and could present a FIRE HAZARD.
PERSONAL SAFETY
Stay alert. Watch what you are doing, and use common sense during use. 1.
Do not use while tired or under the inuence of drugs, alcohol, or medica-
tion. A moment of inattention while operating may result in serious personal injury.
Dress properly. Do not wear loose clothing or jewelry. Contain long hair. 2.
Keep your hair, clothing, and gloves away from moving parts. Loose clothes,
jewelry, or long hair can be caught in moving parts.
Avoid accidental starting.3. Be sure the Power Switch Lever is turned off
before plugging in. Plugging in compressors with the Power Switch Lever on,
invites accidents.
Remove adjusting keys or wrenches before turning the compressor on. 4. A
wrench or a key that is left attached to a rotating part of the compressor may result
in personal injury.
Do not overreach. Keep proper footing and balance at all times.5.
SKU 65903 For technical questions, please call 1-800-444-3353. Page 3
Use safety equipment. Always wear eye protection. 6. Make sure you are wear-
ing your protective clothing, safety glasses with side shields and dust mask or air
respirator, if appropriate.
TOOL USE AND CARE
Do not force the compressor. Use the correct compressor for your applica-1.
tion. The correct compressor will do the job better and safer at the rate for which it
is designed. Never attempt to force the compressor to provide more pressure than
it was designed for.
Do not use the compressor if the Power Switch Lever does not turn it on or 2.
turn it off. Any compressor that cannot be controlled with the Power Switch Lever
is dangerous and must be repaired or replaced.
Disconnect the Power Cord Plug from the power source before making any 3.
adjustments, changing accessories, or storing the compressor. Such preven-
tive safety measures reduce the risk of starting the compressor accidentally.
Keep idle compressors out of reach of children and other untrained persons. 4.
Compressors are dangerous in the hands of untrained users.
Maintain compressors with care. Keep all components of this product clean 5.
and dry. Do not use a damaged compressor. Tag damaged compressors “Do not
use” until repaired.
Check for misalignment or binding of moving parts, breakage of parts, and 6.
any other condition that may affect the compressor’s operation. If damaged,
have the compressor serviced before using. Many accidents are caused by
poorly maintained compressors.
Use only accessories that are recommended by the manufacturer for your 7.
model. Accessories that may be suitable for one compressor may become haz-
ardous when used on another compressor.
SERVICE
Compressor service must be performed only by qualied repair personnel. 1.
Service or maintenance performed by unqualied personnel could result in a risk of
injury.
When servicing a compressor, use only identical replacement parts. Follow 2.
instructions in the “Inspection, Maintenance, And Cleaning” section of this
manual. Use of unauthorized parts or failure to follow maintenance instructions
may create a risk of electric shock or injury.
SKU 65903 For technical questions, please call 1-800-444-3353. Page 4
SPECIFIC SAFETY RULES
CAUTION! Prior to its 1. rst use, and thereafter prior to each subsequent use,
make sure to ll the Air Compressor with a premium quality, 30 weight, non-
detergent oil to the specied level. Running the Air Compressor with no oil or
with low oil will cause damage to the equipment and void its warranty. Refer to the
“Operating Instructions” section for details on lling the Air Compressor with oil.
When lling the Air Compressor with oil, make sure to 2. unscrew (do not pull)
the Oil Fill Cap to remove.
Use eye and ear protection. 3. Always wear ANSI-approved safety impact eye
goggles, and ear plugs when using the Air Compressor.
Make sure all tools and equipment used with the Air Compressor are rated to 4.
the appropriate air pressure capacity of the Air Compressor. Do not use any
tool or equipment that does not operate from 0-115 PSI. If necessary, check the
owner’s manual of the tool or equipment for its air pressure rating.
Always disconnect the Air Compressor from its electrical outlet, release any 5.
remaining air pressure from the unit, and disconnect all pneumatic tools and
equipment from the unit, before performing any services or maintenance.
Avoid injury. Never direct the air jet at people or animals.6.
Inspect safety valve daily7. . If the safety valve is not working properly, tank pres-
sure can build up to dangerous levels. The tank could explode. For this reason,
pull the ring on the safety valve before each use and verify that it operates freely.
Replace safety valve if it does not operate freely.
Never remove or alter the factory sealed Safety Release Valve.
Do not attempt to readjust the automatic start and shutoff valves. 8. Any
change to the automatic ON/OFF pressure levels will cause additional stress on
the motor, which may result in shortened motor life.
Drain the Air Compressor’s air tank every day. 9. Do not allow moisture to build
up inside the Air Tank.
Do not unscrew the tank drain valve so that 10. more than four threads are
showing.
Avoid risk of tank explosion11. .
Avoid weakening of tank by draining condensation after each use.a.
Never modify tank by drilling holes, welding to it, or modifying it’s parts.b.
The tank is designed, and factory set, to operate within a specic pressure range. c.
For that reason, never make adjustments to, or substitute parts, to the compressor.
Avoid bodily injury from moving parts12. . The compressor cycles on automatically,
without notice. For this reason, always keep hands and arms away from compres-
SKU 65903 For technical questions, please call 1-800-444-3353. Page 5
sor parts when the unit is connected to electrical power. Always have compressor
safety guards in place before turning compressor on.
Use approved air hose13. . Never use plastic or PVC pipe (unless specied for Air
Compressors) to carry air under pressure. Regardless of its pressure rating, it can
burst under pressure. Use only metal pipe.
Never plug the power cord of this product into an electrical outlet while 14.
standing on a wet or damp surface.
THIS AIR COMPRESSOR MAY REQUIRE A DEDICATED ELECTRICAL CIR-15.
CUIT AS THE AMPERAGE DRAW UNDER FULL LOAD, COMBINED WITH USE
OF ANY OTHER ITEM, MAY OVERLOAD YOUR CIRCUIT.
Always turn off the Air Compressor in the event of a power failure.16.
Performance of this Air Compressor may vary depending on variations in lo-17.
cal line voltage.
Maintain labels and nameplates on the Air Compressor.18. These carry important
information. If unreadable or missing, contact Harbor Freight Tools for a replace-
ment.
19. WARNING! People with pacemakers should consult their physician(s) before
using this product. Electromagnetic elds in close proximity to a heart pacemaker
could cause interference to or failure of the pacemaker.
20. 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.)
21. WARNING! The warnings, precautions, and instructions discussed in this
instruction manual cannot cover all possible conditions and situations that may
occur. It must be understood by the operator that common sense and caution are
factors which cannot be built into this product, but must be supplied by the opera-
tor.
SAVE THESE INSTRUCTIONS
GROUNDING
1. WARNING! The Power Cord (31) requires the attachment of a 240 volt,
grounded, 3-Prong Plug (not included). For safety purposes, only a qualied,
certied, electrician should attach a Plug to the Power Cord. Never modify the
Plug in any way. To comply with the National Electric Code, and to provide addi-
tional protection from the risk of electrical shock, this product should only be con-
nected to a 240 volt electrical outlet that is properly grounded.
Do not use the tool if the Power Cord or Plug is damaged. 2. If damaged, have it
repaired by a qualied service facility before use.
SKU 65903 For technical questions, please call 1-800-444-3353. Page 6
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