Central Pneumatic 94734 Installation manual

3 HP TWIN TANK AIR

COMPRESSOR

Model

94734

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.

tained 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

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

SPECIFICATIONS

Motor Power 13/4HP (working), 3 HP (Peak), 1720 RPM;

120 V~, 60 Hz, 1 Phase, 11 A

Air Tank Size 5 gallons

Pump Single stage

Air Outlet Fitting Size 1/4inch NPT barbed

Air Delivery 3.8 CFM at 90 PSI; 4.5 CFM at 70 PSI; and

5 CFM at 40 PSI

Pressure Switch On at 80 PSI; Off at 115 PSI

Safety Valve Releases pressure at 120 PSI

Features Pressure gauge, Overload reset button,

Auto shutoff

SAVE THIS MANUAL

You will need this manual for the safety warnings and precautions, assembly, oper-

ating, 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.

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.

#233060

REV 07b

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

ELECTRICAL SAFETY

Grounded compressors must be plugged into an outlet properly installed and1.

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 qualied 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 MUST4. 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.

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

PERSONAL SAFETY

Stay alert. Watch what you are doing, and use common sense during use. Do1.

not use while tired or under the inuence of drugs, alcohol, or medication. 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 is turned off before plug-

ging in. Plugging in compressors with the Power Switch 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.

Use safety equipment. Always wear eye protection.6. Make sure you are wearing

your protective clothing, safety glasses with side shields and dust mask or air respi-

rator, 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

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

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 does not turn it on or turn it2.

off. Any compressor that cannot be controlled with the Power Switch is dangerous

and must be repaired or replaced.

Disconnect the Power Cord Plug from the power source before making any ad-3.

justments, changing accessories, or storing the compressor. Such preventive

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 clean5.

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 any6.

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 your7.

model. Accessories that may be suitable for one compressor may become hazard-

ous when used on another compressor.

SERVICE

Compressor service must be performed only by qualied repair personnel. 1.

Service or maintenance performed by unqualied personnel could result in a risk of

injury.

When servicing a compressor, use only identical replacement parts. Follow2.

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.

SPECIFIC SAFETY RULES

CAUTION! Prior to its1. rst use, and thereafter prior to each subsequent use,

make sure to ll the Air Compressor with a premium quality, 30 weight, non-

detergent compressor oil to the specied 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 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.

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

Use eye and ear protection.3. Always wear ANSI-approved safety impact eye gog-

gles, and ear plugs when using the Air Compressor.

Make sure all tools and equipment used with the Air Compressor are rated to4.

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.

Always disconnect the Air Compressor from its electrical outlet, release any5.

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.

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 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.

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 that10. more than four threads are show-

ing.

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 specic pressure range. c.

For that reason, never make adjustments to, or substitute parts, to the compres-

sor.

Avoid bodily injury from moving parts12. . 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.

Use approved air hose13. . Never use plastic or PVC pipe (unless specied for Air

Compressors) to carry air under pressure. Regardless of its pressure rating, it can

burst under pressure.

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

ing on a wet or damp surface.

REV 07b

SKU 94734 For technical questions, please call 1-800-444-3353. Page 6

THIS AIR COMPRESSOR MAY REQUIRE A DEDICATED ELECTRICAL CIRCUIT15.

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 local17.

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 in-

struction 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.

SAVE THESE INSTRUCTIONS

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.

IMPORTANT! This compressor is shipped with the oil ll plug removed and without oil.

The oil ll plug is attached to the power cord as a reminder to add oil to the crank-

case. Add oil to the proper level as explained on the next page and secure the oil ll

plug before use.

REV 07i

SKU 94734 For technical questions, please call 1-800-444-3353. Page 7

SETUP

Dipstick

Warning: Fill compressor with oil before using; running with NO OIL or with LOW

OIL will void the warranty. The optimal capacity of the oil reservoir is 7.8 ounces of

oil.

The Dipstick is used to determine if oil is needed. Never operate the compressor with-

out sufcient oil. Use a 30 weight, non-detergent compressor oil. To check the oil:

1. Unscrew the Dipstick.

2. Check the level of the oil. There are two lines on the bottom of the Dipstick. The oil

level should be somewhere between the two lines, as high as possible.

3. Add oil through the Dipstick’s hole as necessary, but do not overll. Always use a high

grade oil specially designed for air compressors. Never mix oils of different types.

Never use a low quality oil which may not afford adequate lubrication.

4. Replace the Dipstick.

Install an Air Intake Filter and Hose (not included)

The lter and oiler (not supplied) are recommended but not mandatory for operation.

1. Remove and discard the plastic cap which covers the threaded hole at the top of the

Cylinder Case (B-6).

2. Screw the threaded part of the air lter assembly into the Cylinder Case until it is rmly

seated.

3. Connect the air tool, air hoses, lter, and oiler to the Compressor Air Output as

illustrated on the next page.

If the lter and oiler are not used, connect the air hose directly to the 1/4 inch NPT

barbed connector located at the Air Flow Valve (A-8). For easy connection or removal,

a quick coupler should be installed on the end of the air output.

Note: Use pipe thread seal tape on all threaded connections.

SKU 94734 For technical questions, please call 1-800-444-3353. Page 8

REV 07b

OPERATION

CAUTION! Prior to use, inspect the compressor for any damaged parts or unsafe con-

ditions. Make any necessary repairs before using again.

Turning Compressor On

1. Verify Tank Drain Valve (A-7) is closed.

2. Verify oil level is correct.

3. Verify that the Safety Valve (A-4) is operational.

4. Turn the Air Flow Valve (A-8) to the OFF position.

5. Plug the power cord into an electrical grounded 115 Volt AC electrical receptacle.

6. Rotate the Power Switch (A-5) to the Vertical position to turn the air compressor on.

Rotate that same switch to the horizontal position to turn it off. See page 10.

Note: Allow the pressure to build up to at least 80 PSI before using air.

Note: Motor will not start if tank pressure is already between 80-115 PSI. Pressure MUST

be below 80 PSI for motor to restart and build up pressure to the 115 PSI cut off

pressure.

7. Open the Air Flow Valve (A-8) and check for air leaks.

The operation of the compressor is automatic, as controlled by the internal pressure

switch. When the pressure drops below its operating range the compressor turns on.

When the pressure is above 115 PSI, the compressor shuts off.

Warning; The compressor will become very hot during operation. Do not touch the

cylinder area of the compressor, or allow ammable materials to come in contact with

the cylinder area.

Adjusting Pressure Gauge and Pressure Adjustment Screw

Caution: The Pressure Switch is adjustable but changes to the pressure levels are not

recommended; any change to the automatic ON/OFF pressure levels will cause addi-

tional stress on the motor which may shorten motor life.

Adjusting Air Output

1. When the Air Flow Valve (A-8) is to the right or left, the valve is closed. When it is in

the middle, it is open.

2. Turn the Air Flow Valve to the appropriate pressure.

SKU 94734 For technical questions, please call 1-800-444-3353. Page 9

MAINTENANCE

WARNING! Do not make any repairs, adjustments, or maintenance on the air compressor

unless it is disconnected from the electrical power and the tank pressure is released.

Maintenance should always be performed by a qualied technician.

1. Check the oil level before each use. If the oil is low, add some. If it is high, drain some

by removing the Drain Plug. Replace the oil once a year.

2. Check and clean the Air Filter (B-5) every 50 hours, or sooner if used in a dusty

environment.

3. Drain the air tanks after each use by opening the drain petcock or the Tank Drain

Valve (A-7). Leave open until the next use.

4. After the compressor has cooled down, clean it with a damp rag containing mild

detergent and water. Do not use ammable liquids or solvents.

PARTS LIST “A”

Item Description Qty

A-1 Compressor Assembly 1

A-2 Pressure Gauge 1

A-3 Rubber Grip 1

A-4 Safety Valve 1

A-5 ON/OFF Switch 1

A-6 Air Tank 2

A-7 Tank Drain Valve 1

A-8 Air Flow Valve 1

A-9 One Way Valve 1

A-10 Air Tube 1

A-11 Base 1

A-12 Rubber Foot 1

A-13 Bolt and Nut 1 ea.

A-14 Air Unloader Tube 1

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 DIAGRAM IN THIS MANUAL

AS A REFERENCE TOOL ONLY. NEITHER THE MANUFACTURER NOR 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

TECHNICIANSAND NOT BY THE BUYER. THE BUYER ASSUMES ALL RISKAND LIABILITYARISING 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.

REV 10d

SKU 94734 For technical questions, please call 1-800-444-3353. Page 10

Note: The Air Compressor is equipped with an external overload device. Should the Air

Compressor experience a short or excessive load, the overload device will trip and

the machine will automatically shut down. If this happens, turn Off the Power Switch

(A5), wait 10 minutes and check for any obvious problems. Reset the Overload

Protection Button (41) then, turn On the Power Switch to restart the Air Compressor.

See Drawing “A” below.

ASSEMBLY DRAWING “A”

A11

A13

A14

A12

A7 (under the tank)

(41) Overload

Protection

Button

REV 07b; 10d

A10

A14

A10

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