®
1/2” AIR IMPACT
WRENCH
Model 02623
ASSEMBLY and OPERATING
INSTRUCTIONS
®
3491 Mission Oaks Blvd., Camarillo, CA 93011
Copyrightc 2002 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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8. Do not overreach. Keep proper footing and balance at all times. Do not reach over or
across running machines or air hoses.
9. Maintain tools with care. Keep tools clean for better and safer performance. Follow
instructions for lubricating and changing accessories. Inspect tool cords and air hoses
periodically 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 air supply. Disconnect air hose when not in use.
11. Remove adjusting keys and wrenches. Check that keys and adjusting wrenches
are removed from the tool or machine work surface before plugging it in.
12. Avoid unintentional starting. Be sure the Trigger (#8) is not depressed when not in
use and before attaching to the air hose. Do not carry the Impact Wrench with the
Trigger (#8) depressed.
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 Trigger (#8) does not engage and disengage
properly.
15. Guard against electric shock. Prevent body contact with grounded surfaces such as
pipes, radiators, ranges, and refrigerator enclosures.
16. Replacement parts and accessories. When servicing, use only identical
replacement parts. Use of any other parts will void the warranty. Only use accessories
intended for use with this tool. Approved accessories are available from Harbor
Freight Tools.
17. Do not operate tool if under the influence of alcohol or drugs. Read warning
labels on prescriptions to determine if your judgment or reflexes are impaired while
taking drugs. If there is any doubt, do not operate the tool.
18. Use proper size and type extension cord. If an extension cord is required for the air
compressor, it must be of the proper size and type to supply the correct current to the
tool without heating up. Otherwise, the extension cord could melt and catch fire, or
cause electrical damage to the tool. Check your compressor’s manual for the
appropriate size cord.
19. Maintenance. For your safety, maintenance should be performed regularly by a
qualified technician.
20. Compressed air only. Never use combustible gases as a power source.
21. Continual exposure to sound levels above 85 decibles could cause hearing damage.
Hearing protection is advised with this tool.
Note: Performance of the compressor (if powered by line voltage) may vary depending on
variations in local line voltage. Extension cord usage may also affect tool
performance.
Page 3
SKU 02623
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Warning:The warnings, cautions, and instructions discussed in this instruction manual
cannot cover all possible conditions and situations that may occur. It must be under-
stood by the operator that common sense and caution are factors which cannot be
built into this product, but must be supplied by the operator.
Unpacking
When unpacking, check to make sure the parts listed on page 6 are included. If any parts
are missing or broken, please call Harbor Freight Tools at the number on the cover of this
manual as soon as possible.
Operation
1/4” - 18 NPT
Impact
Wrench
For best service you should incorporate an oiler, regulator, and inline filter, as shown in the
diagram above. Hoses, couplers, oilers, regulators, and filters are all available at Harbor
Freight Tools.
1. You will need to prepare a 1/4” air connector (sold separately) to connect to the Air
Inlet (#1). First, wrap the 1/4” air connector (not included) with pipe thread seal tape before
connecting to a Air Source Hose (not included).
2. Attach air hose to the Air Inlet (#1) on the Impact Wrench.
Note: If you are not using an automatic oiler system, before operation, add a few drops of
Pneumatic Tool Oil to the airline connection. Add a few drops more after each hour of
continual use.
3. Set the air pressure on your compressor to 90 PSI. Do not exceed the maximum air
pressure of 90 PSI.
4. Check the air connection for leaks.
Warning!! This Impact Wrench supplies powerful torque and is designed to be operated with
two hands. Failure to operate the Impact Wrench with two hands may result in serious injury.
Page 4
SKU 02623
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Operation (continued)
Note: Turn off your air compressor and disconnect the air hose when you are changing
sockets. After you attach the socket, attach the air hose and turn the air compressor on.
5. Select the appropriate size 1/2” socket for your needs.
6. Push and snap the socket (not included) onto the Anvil (#43).
Tightening
Note: Push Forward/Reverse Valve #9 to the left for clockwise rotation, push to the right for
counterclockwise rotation. This is a sliding valve that is combined with Air Regulator lever
(#13).
8. Tighten the nut as tight as you can by hand.
9. Place the socket (not included) over the nut you wish to tighten.
10. Grip the Impact Wrench firmly with two hands and gently squeeze the Trigger (#8).
Note: Fine tune the air flow with the Air Regulator (#13) knob by adjusting it from positions
1 through 6. One allows the lowest amount of air flow, and six the highest.
Note: If the Impact Wrench cannot tighten the nut to your satisfaction, do not raise the air
pressure on the compressor over 90 PSI. Air pressure above 90 PSI will strip the workpiece
and damage the tool. Use other appropriate methods and tools to tighten the nut.
11. When the nut is tightened, release the Trigger (#8). Turn off the air compressor and
disconnect the hose.
12. If available, check the recommended torque specification for the nut. Use a torque
wrench to tighten the nut to the proper setting after using the Impact Wrench.
Loosening
Note: Push Forward/Reverse Valve (#9) to the right for counterclockwise rotation.
13. Place the socket (not included) over the nut you wish to loosen.
14. Grip the Impact Wrench firmly with two hands and gently squeeze the Trigger (#8).
Note: If the Impact Wrench cannot loosen the nut, do not raise the air pressure on the
compressor over 90 PSI. Do not attempt to loosen the nut with the Impact Wrench. Use other
appropriate methods and tools to loosen the nut.
15. When the nut is loosened, release the Trigger (#8). Turn off the air compressor and
disconnect the hose.
16. If needed, remove the nut from the socket.
Maintenance
1. Make sure your Impact Wrench is disconnected from the air hose before attempting any
maintenance.
2. If you are not using an automatic oiler system, put a few drops of pneumatic tool oil through
the air line before and after each use. During use, add a few drops every hour.
3. Apply a few drops of oil to the Throttle Valve Pin (#6) before each use.
4. Wipe the Impact Wrench down with a lint free cloth after each use.
5. Make sure the Anvil (#43) is clear of dirt or debris. If possible, spray it with compressed air
before each use.
Page 5
SKU 02623
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Parts List
Part No.
1
2
4a
5a
6
7
8
9
11
12
13
14
15
16
17
20a
22
23
24
25
26
Description
Air Inlet
Qty. Part No.
Description
Cylinder Dowel
Rotor Blade
Front End Plate
Rear End Plate
End Plate Gasket
Motor Clamp Washer
Hammer Frame
Hammer Pin
Qty.
1
6
1
1
1
2
1
2
2
1
1
1
1
4
1
1
1
1
1
1
1
1
1
27
29
30
31
32
33
34
35
37
38
38a
39
40
41
43
44
45
48
49
Throttle Valve Spring
Throttle Valve Assy.
Throttle Valve Seat
Throttle Valve Pin
Exhaust Deflector
Trigger
Forward/Reverse Valve 1
0-ring
2
1
1
1
1
1
1
1
1
1
1
1
1
Hammer
Motor Housing Assy.
Air Regulator
Air Regulator Screw
Steel Ball
Steel Ball Spring
Grease Fitting
0-ring
Hammer Case
Hammer Case Pilot
Hammer Case Gasket
Hammer Case Bushing
Hammer Case Cap Screw
Anvil
Socket Retainer
Retainer 0-ring
Cap
Rotor
1
1
1
Rear Rotor Bearing
Front Rotor Bearing
R. Rotor Bearing Ret.
Cylinder
Screw
PLEASE READTHE FOLLOWING CAREFULLY
THE MANUFACTURER AND/OR DISTRIBUTOR HAS PROVIDEDTHE PARTS DIAGRAM INTHIS
MANUAL AS A REFERENCE TOOL ONLY. NEITHER THE MANUFACTURER NOR DISTRIBU-
TOR MAKES ANY REPRESENTATION ORWARRANTY OF ANY KINDTO THE BUYERTHAT 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 STATESTHAT 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 PARTS THERETO, OR ARISING
OUT OF HIS OR HER INSTALLATION OF REPLACEMENT PARTS THERETO.
NOTE: Some parts are listed and shown for illustration purposes only and are not available
individually as replacement parts.
Page 6
REV 08/03
SKU 02623
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Assembly Drawing
Page 7
SKU 02623
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