Central Pneumatic 37730 User manual

3/8”3/8”

3/8” ButterflyButterfly

ButterflyButterfly

Butterfly

Air Impact WrenchAir Impact Wrench

Air Impact Wrench

ASSEMBLY AND OPERATING INSTRUCTIONS

3491 Mission Oaks Blvd., Camarillo, CA 93011

Visit ourWeb site at http://www.harborfreight.com

manual or any artwork contained herein may be reproduced in any shape or form

without the express written consent of Harbor FreightTools.

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

37730

SKU37730 Page 2

Specifications

This compact Impact Wrench allows you to get at fasteners in much tighter spots

thanconventional“pistol”designedairimpactwrenches.Itdeliversapowerful50ft/

lbs of torque at 90 PSI, at up to 1580 impacts per minute. It uses standard 1/4” npt

air connections, and a convenient 3/8”drive.The Butterfly switch on top of the tool

allows you to quickly and easily change impact direction. The built in regulator

allows you to instantly change air pressure and torque among 8 settings. Sturdily

built with a polished aluminum body and machined steel components, it is a

versatile tool you will be proud to have in your tool box.

Save This Manual

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

instructions, operating and maintenance procedures, parts list and diagram. Keep

your invoice with this manual. Write the invoice number on the inside of the front

cover. Keep the manual and invoice in a safe and dry place for future reference.

Safety Warnings and Precautions

WARNING: When using tool, basic safety precautions should always be fol-

lowed to reduce the risk of personal injury and damage to equipment.

Read all instructions before using this tool!

1. Keep work area clean. Cluttered areas invite injuries.

2. Observe work area conditions. Do not use machines or power tools in

damp or wet locations. Don’t expose to rain. Keep work area well lit. Do not

use electrically powered tools in the presence of flammable gases or liquids.

3. Keep children away. Children must never be allowed in the work area. Do

not let them handle machines, tools, or extension cords.

4. Store idle equipment. When not in use, tools must be stored in a dry

location to inhibit rust. Always lock up tools and keep out of reach of children.

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SKU37730 Page 3

5. Use the right tool for the job.Do not attempt to force a small tool or

attachment to do the work of a larger industrial tool. There are certain

applications for which this tool was designed. It will do the job better

and more safely at the rate for which it was intended. Do not modify this

tool and do not use this tool for a purpose for which it was not intended.

6. Dress properly while working. Do not wear loose clothing or jewelry as

theycanbe caught in movingparts. Protective, electrically non-conductive

clothesandnon-skidfootweararerecommendedwhenworking. Wear

restrictivehair covering to contain longhair.

7. Use eye, face and ear protection. Alwayswear ANSI approved impact

safety goggles.Wear a full face shield if you are producing metal filings or

woodchips.WearanANSIapproveddust mask or respiratorwhenworking

around metal, wood, and chemical dusts and mists. Wear ANSI approved ear

plugs.

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

reachoveroracrossrunningmachines.

9. Maintain tools with care. Keep tools clean and in good condition for better

andsaferperformance.Followinstructionsforlubricatingandchanging

accessories.Inspect tool fittings and hosesperiodically and, if damaged,have

them repaired by an authorized technician. The handles must be kept clean,

dry, and free from oil and grease at all times.

10. Disconnect power.Disconnect from air pressuresource when not in use.

11. Remove adjusting keys and wrenches. Check that keys and adjusting

wrenchesareremovedfromthe tool or machine work surfacebefore

connecting it.

12. Avoid unintentional starting. Be sure the ButterflyThrottle Switch is in the

neutral, OFF position when not in use and before attaching to pressure

source.Do not carry any tool with your finger on the ButterflyThrottle Switch,

whether it is attached or not.

13. Stay alert. Watch what you are doing, use common sense.Do not operate

any tool when you are tired.

14. Check for damaged parts. Before using any tool, any part that appears

damaged should be carefully checked to determine that it will operate

properly and perform its intended function.Check for alignment and binding

of moving parts;any broken parts or mounting fixtures;and any other

condition that may affect proper operation.Any part that is damaged should

be properly repaired or replaced by a qualified technician.Do not use the tool

if the ButterflyThrottle Switch does not function properly.

SKU37730 Page 4

15. Guard against electric shock when working on electrical equipment,

such as your air compressor. Prevent body contact with grounded surfaces

suchaspipes, radiators, ranges, and refrigeratorenclosures.

16. Replacement parts and accessories. When servicing,useonlyidentical

replacement parts.Use of any other parts will void the warranty.Only use

accessoriesintended for use with this tool. Approved accessories are

availablefromHarborFreightTools.

17. Do not operate tool if under the influence of alcohol or drugs. Read

warninglabelsonprescriptions to determine if yourjudgmentor reflexes are

impaired while taking drugs. If there is any doubt, do not operate the tool.

18. Use proper size and type air pressure line and fittings. The recommended

air line for this tool is 3/8” delivering no more than 90 psi. Recommended air

inlet size is 1/4” - 18 npt.

19. Maintenance. For your safety, service and maintenance should be performed

regularlybyaqualified technician.

20. You should maintain a proper regulator and moisture trap in your air

line at all times.

Note:Performanceofthistoolmay vary dependingonvariationsinlocalairpressure.

Warning: The warnings, cautions, and instructions discussed in this instruc-

tion manual cannot cover all possible conditions and situations that may oc-

cur. 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.

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.

)

Unpacking

When unpacking, Examine the conditiojn of your impact wrench. If any parts are

missing or broken, please call Harbor FreightTools at the number on the cover of

this manual.

Air Impact

Wrench

SKU37730 Page 5

Operation

1. Install a standard 1/4” Air Connector (not included) to the Air Inlet (36). First

wrapthethreaded portion of the1/4”air connector with pipethreadseal tape

before threading it into the Air Inlet (36).Tighten securely.

2. Attach a standard quick connector (not included) to your 3/8” air pressure

source hose. Then attach the air hose to the Air Impact Wrench.

NOTE:If you are not using an automatic in-line oiler, add a few drops of pneumatic

oil to the Air Inlet (36) before attaching the air hose. Add a few more drops of oil

aftereveryhourofcontinualuse.

3. Set the air pressure regulator on your air compressor at 90 psi.

WARNING: Donot exceedthe recommended pressure of90 psi.Damage to your

tool,and possiblepersonal injury and/or property damage mayresult.

4. Check the air line and its connections for air leaks. Make note of these, and

repairthembefore using this tool.

NOTE: Turnoffyouraircompressoranddisconnecttheairpressurehosebefore

changing sockets or making any adjustments to this tool. Severe injury or property

damagemayotherwiseresult.

WARNING:This tool generates considerable torque when in use.Always hold the

tool with both hands when using, and brace yourself to resist the torque which will

bedeliveredtothework piece.

5. Select the appropriate size 3/8” square drive impact socket (not included) for

your needs. Push and snap the socket onto the Anvil (9).

6. Set the direction of the Air Impact

Wrenchto“FORWARD”or

“REVERSE”. Please see photo. By

movingthe ThrottleLever“Butterfly”

(5) to the right, you are setting the

tool to operate FORWARD.You may

control the amount of torque to be

appliedbyrotatingtheRegulator(38)

(Seephotonextpage).

Thereare

settings from 1 through 8, indicating

increasingtorque.RocktheThrottle

Lever “Butterfly” (5) to the left to REVERSE the direction of the tool.

NOTE:In this booklet, “FORWARD”refers to clockwise rotation,and “REVERSE”

refersto counterclockwise rotation ofthe Anvil (9). Always be aware of the direction

of the threading of the fastener you are working on. While most fasteners install

withclockwiserotation, some threads areintentionally the reverse.

FORWARD

REVERSE

ThrottleLever“Butterfly”(5)

SKU37730 Page 6

NOTE:Theactual torque deliveredateach of the eight

settings will depend on the air pressure supplied to the

tool.We suggest that you test the actual torque by

tightening a nut or bolt at each setting, then observing

the resultant torque by using a mechanical torque

wrench(notsupplied).

7. If installing a nut or bolt, set it as tight as possible by

handbeforetighteningwiththeAirImpactWrench.

8. Place the socket (not included) over the fastener.

9. Grip the Air ImpactWrench tightly with both hands,

and rock theThrottle Lever“Butterfly”(5) to the

right.The toolwill operate and tightenthefastener.

10. When the fastener is tightened, release theThrottle Lever “Butterfly”(5) , and

remove the tool from the fastener.

11. If possible, check the actual torque applied to the fastener with a mechanical

torquewrench(notsupplied).

12. If removing a fastener, grip the Air Impact Wrench tightly with both hands, and

rock theThrottle Lever“Butterfly”(5) to the left.The tool will operate and

loosen the fastener (assuming that the fastener is a standard right-hand

thread).NOTE: Always check to be sure of the thread direction of any

fastener before attempting to install or remove it. If the fastener is a left-hand

thread, rock theThrottle Lever “Butterfly”(5) to the right for removal.

WARNING:If the fastener will not come off,first check to be sure of the

direction of the thread. If you have the thread direction correct and the fas-

tener will not come off,DO NOT INCREASETHE AIR PRESSURE to the tool

beyond 90 psi.This may damage the tool.You may have to use penetrating

oil,heat,or a mechanical wrench to remove the fastener.

13. When you are done using this tool, turn off the air compressor, and disconnect

the air hose.Put the Air Impact Wrench away in its proper storage place.

Regulator(38)

Maintenance

1. Your Air Impact Wrench should be kept clean and dry.

2. When not in use, store your tool in a suitable place where it will not be

exposedtowater,corrosivematerials,orunduebangingaround.

3. If you are not using an in-line oiler, you should inject a few drops of pneumatic

oil into the air inlet of the tool and the Oiler Screw (3) port after every hour of

continuoususe.

4. If your tool loses power, or you notice air leaks, take it to a certified technician for service.

5. All repairs to this tool should be performed by a qualified service technician.

SKU37730 Page 7

Parts List

NOTE: Some parts are listed and shown for illustration purposes only and are not

available individually as replacement parts.

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PLEASE READ THE FOLLOWING CAREFULLY

THE MANUFACTURER AND/OR DISTRIBUTOR HAS PROVIDED THE PARTS DIAGRAM

IN THIS MANUAL AS A REFERENCETOOL ONLY. NEITHER THE MANUFACTURER NOR

DISTRIBUTOR MAKES ANY REPRESENTATION OR WARRANTY OF ANY KIND TO THE

BUYER THAT HE OR SHE IS QUALIFIEDTO MAKE ANY REPAIRS TOTHE PRODUCT OR

THAT HE OR SHE IS QUALIFIED TO REPLACE ANY PARTS OFTHE 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 PARTSTHERETO, OR ARISING OUT OF HIS OR HER INSTALLATION

OF REPLACEMENT PARTS THERETO.

SKU37730 Page 8

Assembly Drawing

Table of contents

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