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3/4" HEAVY DUTY AIR IMPACT
WRENCH
ASSEMBLY and OPERATING INSTRUCTIONS
®
3491 Mission Oaks Blvd. / Camarillo, CA 93011
Copyright © 1997 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.
SKU 32871 Page 1
For technical questions, please call 1-800-444-3353.
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SPECIFICATIONS Free Speed 4500 RPM Air Inlet ¼” NPT PSI 90 CFM 7 Torque *500 maximum ft-lbs. SAVE THIS MANUAL You will need the manual for the safety warnings and cautions, assembly instructions, operating procedures, maintenance procedures, trouble shooting, parts list, and diagram. Keep your invoice with this manual. Write the invoice number on the inside of the front cover. Keep both this manual and your invoice in a safe, dry place for future reference. SAFETY WARNING & CAUTIONS WARNING: Whe
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Wear a full face shield if you are producing metal filings or wood chips. Wear an ANSI approved dust mask or respirator when working around metal, wood, and chemical dusts and mists. 9. DO NOT ABUSE THE POWER CORD. Do not yank compressor’s cord to disconnect it from the receptacle. Do not carry tools by the cord. 10. DO NOT OVERREACH. Keep proper footing and balance at all times. Do not reach over or across running machines. 11. MAINTAIN TOOLS WITH CARE. Keep tools sharp and clean for better and
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UNPACKING Your Impact Wrench comes completely assembled. If any parts are missing or broken, please call Harbor Freight Tools at the number on the cover of this manual. GENERAL This Impact Wrench develops a maximum of 535 ft/lbs. of torque. The amount of torque can be increased or decreased using the AIR REGULATOR (#46). When the Air Regulator is completely screwed in it is at it’s lowest setting. Air pressure increases as you loosen the Air Regulator. SKU 32871 Page 4 For technical questions
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OPERATION Setup Frequent, but not excessive, lubrication is required for best performance. Oil added through the airline connection will lubricate internal parts. An automatic airline oiler is recommended but oil may be added manually before every operation or after about 1 hour of continuous use. Only 4 to 5 drops of oil at a time are necessary. Too much oil will collect inside the tool and be blown out during the exhaust cycle. ONLY USE PNEUMATIC TOOL OIL. Do not use detergent oil or add
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Use Step 1: Set the compressor’s pressure regulator to a maximum of 90 PSI. 90 PSI is satisfactory without harming this tool. Step 2: You will need to purchase a union fitting (sold separately) before you can connect the Impact Wrench to your air compressor. You may also wish to purchase an Air Coupler as this allows quick-coupling action when using multiple tools with one compressor. Step 3: Determine the socket size necessary for the job you need to do. Attach the appropriate 3/4" drive soc
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Step 5: Select the power setting for Loosening by adjusting the AIR REGULATOR (#46) located on the bottom of the Impact Wrench as shown CAUTION in Figure 3. When the Air Regulator is Use the Setting Appropriate for the completely screwed in it is at it’s lowest setting. Job. Do Not Set the Power Setting Air pressure increases as you loosen Higher Than Needed. Damage to the Air Regulator. Parts Could Result. Air Regulator (#46) Figure 3 — Adjusting the Reverse Power Setting Step 6: Sele
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Step 7: Press the TRIGGER (#38) to test the Impact Wrench. The Impact Wrench should spin freely as shown if Figure 5 Trigger (#38) Figure 5 — Pressing Trigger Loosening Step 1: Verify that the power level is correct for your needs and that the REVERSE VALVE (#48) has been shifted (pressed) completely to the right. If not, refer to Steps 5 through 9 under Use before proceeding. Step 2: Place your work in as clear a location as possible. Make sure the air hose will reach as far as needed with
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Tightening Step 1: Verify that the power level is correct for your needs and that the REVERSE VALVE (#48) has been shifted (pressed) completely to the left. If not, refer to Steps 5 through 9 under Use before proceeding. Step 2: Place your work in as clear a location as possible. Make sure the air hose will reach as far as needed without stressing any connections. Step 3: Thread the nut or bolt on as far as possible by hand. This is to prevent cross-threading. Step 4: If you have torque specs
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PARTS LIST Item# Description Parts# Item# Description Parts# 1 Housing HY161-01 25 Spring Washer HY160-36 2 Set Screw HY160-45 26 Cylinder Screw HY161-19 3 Anvil Bushing HY161-02 27 Spring Washer HY161-25 4 Washer HY161-03 28 Cap Screw HY161-26 5 Anvil Collar HY161-04 29 Rubber HY161-27 6 O-Ring HY161-05 30 Protector, Rubber HY161-44 7 Anvil HY161-06 31 Oil Seal HY161-43 8 Hammer Cage HY161-07 32 Tapping Screw HY161-16 9 Bearing HY161-11 33 Exhaust Deflector HY161-32 10 Oil Seal HY161-12 34 Pin
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ASSEMBLY DIAGRAM SKU 32871 Page 11 For technical questions, please call 1-800-444-3353.
