Harbor Freight Tools 94734 User Manual

3 HP TWIN TANK

AIR COMPRESSOR

94734

ASSEMBLY AND OPERATING INSTRUCTIONS

Due to continuing improvements, actual product
may differ slightly from the product described herein.

3491 Mission Oaks Blvd., Camarillo, CA 93011

Visit our Web site at http://www.harborfreight.com

Copyright© 2006 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.

For technical questions and replacement parts, please call 1-800-444-3353

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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, fire, and/or serious injury.

SAVE THESE INSTRUCTIONS

WORK AREA

1. Keep your work area clean and well lit. Cluttered benches and dark areas invite
accidents.

2. Do not operate compressors in explosive atmospheres, such as in the presence
of flammable liquids, gases, or dust. Compressors create sparks which may ignite
the dust or fumes.

3. Keep bystanders, children, and visitors away while operating a compressor.
Provide barriers or shields as needed.

REV 02/07

SKU 94734 For technical questions, please call 1-800-444-3353. Page 2

ELECTRICAL SAFETY

1. Grounded compressors must be plugged into an outlet properly installed 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 qualified 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.

2. Do not expose compressors to rain or wet conditions. Water entering an electric
motor will increase the risk of electric shock.

3. Do not abuse the Power Cord. 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.

4. AN EXTENSION CORD MUST 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.

5. Always unplug the air compressor, and release the air pressure when not in use.

PERSONAL SAFETY

1. Stay alert. Watch what you are doing, and use common sense during use. Do not
use while tired or under the influence of drugs, alcohol, or medication. A moment

of inattention while operating may result in serious personal injury.

2. Dress properly. Do not wear loose clothing or jewelry. Contain long hair. Keep
your hair, clothing, and gloves away from moving parts. Loose clothes, jewelry, or
long hair can be caught in moving parts.

3. Avoid accidental starting. Be sure the Power Switch is turned off before plugging
in. Plugging in compressors with the Power Switch on, invites accidents.

4. Remove adjusting keys or wrenches before turning the compressor on. A wrench
or a key that is left attached to a rotating part of the compressor may result in personal
injury.

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

6. Use safety equipment. Always wear eye protection. Make sure you are wearing
your protective clothing, safety glasses with side shields and dust mask or air respirator,
if appropriate.

SKU 94734 For technical questions, please call 1-800-444-3353. Page 3

TOOL USE AND CARE

1. Do not force the compressor. Use the correct compressor for your application.
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.

2. Do not use the compressor if the Power Switch does not turn it on or turn it off.
Any compressor that cannot be controlled with the Power Switch is dangerous and
must be repaired or replaced.

3. Disconnect the Power Cord Plug from the power source before making any
adjustments, changing accessories, or storing the compressor. Such preventive
safety measures reduce the risk of starting the compressor accidentally.

4. Keep idle compressors out of reach of children and other untrained persons.
Compressors are dangerous in the hands of untrained users.

5. Maintain compressors with care. Keep all components of this product clean and
dry. Do not use a damaged compressor. Tag damaged compressors “Do not use” until
repaired.

6. 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 serviced before using. Many accidents are caused by poorly maintained

compressors.

7. Use only accessories that are recommended by the manufacturer for your model.
Accessories that may be suitable for one compressor may become hazardous when
used on another compressor.

SERVICE

1. Compressor service must be performed only by qualified repair personnel. Service
or maintenance performed by unqualified personnel could result in a risk of injury.

2. When servicing a compressor, use only identical replacement parts. Follow

instructions in the

Use of unauthorized parts or failure to follow maintenance instructions may create a
risk of electric shock or injury.

“Inspection, Maintenance, And Cleaning”

section of this manual.

SPECIFIC SAFETY RULES

1. CAUTION! Prior to its

sure to fill the Air Compressor with a premium quality, 30 weight, non-detergent
compressor oil to the specified 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 “Setup”
instructions on page 7 for details on filling the Air Compressor with oil.

first

use, and thereafter prior to each

subsequent

use, make

2. When filling the Air Compressor with oil, make sure to
Oil Fill Cap to remove.

SKU 94734 For technical questions, please call 1-800-444-3353. Page 4

unscrew

(do not pull) the

3. Use eye and ear protection. Always wear ANSI-approved safety impact eye goggles,
and ear plugs when using the Air Compressor.

4. Make sure all tools and equipment used with the Air Compressor are rated to the
appropriate air pressure capacity of the Air Compressor. Do not use any tool or
equipment that does not operate from 0-120 PSI. If necessary, check the owner’s manual
of the tool or equipment for its air pressure rating.

5. Always disconnect the Air Compressor from its electrical outlet, release any

remaining air pressure from the unit, and disconnect all pneumatic tools and
equipment from the unit, before performing any services or maintenance, or when
not in use.

6. Avoid injury. Never direct the air jet at people or animals.

7. Inspect safety valve daily. If the safety valve is not working properly, tank pressure 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.

8. Do not attempt to readjust the automatic start and shutoff valves. Any change to
the automatic ON/OFF pressure levels will cause additional stress on the motor, which
may result in shortened motor life.

9. Drain the Air Compressor’s air tank every day. Do not allow moisture to build up
inside the Air Tank.

10. Do not unscrew the tank drain valve so that

more than

four threads are showing.

11. Avoid risk of tank explosion.
a) Avoid weakening of tank by draining condensation after each use.
b) Never modify tank by drilling holes, welding to it, or modifying it’s parts.
c) The tank is designed, and factory set, to operate within a specific pressure range.

For that reason, never make adjustments to, or substitute parts, to the compressor.

12. Avoid bodily injury from moving parts. The compressor cycles on automatically,
without notice. For this reason, always keep hands and arms away from compressor
parts when the unit is connected to electrical power. Always have compressor safety
guards in place before turning compressor on.

13. Use approved air hose. Never use plastic or PVC pipe (unless specified for Air
Compressors) to carry air under pressure. Regardless of its pressure rating, it can burst
under pressure.

14. Never plug the power cord of this product into an electrical outlet while standing

on a wet or damp surface.

15. THIS AIR COMPRESSOR MAY REQUIRE A DEDICATED ELECTRICAL CIRCUIT

AS THE AMPERAGE DRAW UNDER FULL LOAD, COMBINED WITH USE OF ANY
OTHER ITEM, MAY OVERLOAD YOUR CIRCUIT.

16. Always turn off the Air Compressor in the event of a power failure.

REV 02/07

SKU 94734 For technical questions, please call 1-800-444-3353. Page 5