Harbor Freight Tools Impact Driver 91715 User Manual

1/2” IMPACT WRENCH  
(MAGNESIUM, 2 HAMMER)  
Model 91715  
ASSEMBLY AND OPERATING  
INSTRUCTIONS  
®
3491 Mission Oaks Blvd., Camarillo, CA 93011  
TO PREVENT SERIOUS INJURY,  
READ AND UNDERSTAND ALL WARNINGS  
AND INSTRUCTIONS BEFORE USE.  
©
®
Copyright 2004 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.  
REV 09/04  
 
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 is released when not in use and  
before plugging in. Do not carry any tool with your finger on the trigger, whether it is  
plugged in 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 any switch does not turn On and Off 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 if taking prescription medicine to determine if your judgement or reflexes are  
impaired while taking drugs. If there is any doubt, do not operate the Wrench.  
18. Use proper size and type extension cord. If an extension cord is required, it must be  
of the proper size and type to supply the correct current to the compressor without  
heating up. Otherwise, the extension cord could melt and catch fire, or cause electrical  
damage to the compressor. Check your air 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 gas as a power source.  
21. This Impact Wrench should only be used with impact sockets and extensions.  
Using any other accessories can cause the accessories to break, causing permanent  
damage to the unit and severe injury to the operator.  
SKU 91715  
For technical questions, please call 1-800-444-3353  
Page 3  
 
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 perfor-  
mance.  
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 8 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  
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
1.  
You will need to prepare a / ” air connector (not included) to connect to the Air Inlet  
4
1
(408) on the Impact Wrench. First, wrap the / ” air connector with pipe thread seal  
tape before threading it into the Air Inlet (408). Connect the / ” ID Air Source Hose to  
4
3
8
a quick connect coupler (not included), and then to 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.  
2.  
3.  
Set the air pressure on the regulator to 90 PSI. Do not exceed the recommended air  
pressure of 90 PSI.  
Check the air connection for leaks. Disconnect from the air source.  
SKU 91715  
For technical questions, please call 1-800-444-3353  
Page 4  
 
Operation (continued)  
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.  
Refer to FIGURES 1 through 3 on page 6, and the Assembly Drawing on page 8.  
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.  
4.  
5.  
6.  
Select the appropriate size 1/2” drive socket for your needs.  
Push and snap the socket (not included) onto the Anvil (105).  
To operate the Forward/Reverse Lever (205) follow the directions in FIGURE 2 on page  
6.  
Note: Set the Forward/Reverse Lever (205) so that the anvil turns clockwise (forward).  
7.  
8.  
9.  
Tighten the nut as tight as you can by hand.  
Place the socket (not included) over the nut you wish to tighten.  
Grip the Impact Wrench firmly with two hands and gently squeeze the Trigger (409).  
Note: If the Impact Wrench cannot tighten the nut to your satisfaction, do not raise the air  
pressure on the compressor over 90 PSI. Pressures above 90 PSI will strip the work-  
piece and damage the tool, potentially causing the tool to fail, causing serious injury.  
Use other appropriate methods and tools to tighten the nut.  
10.  
When the nut is tightened, release the Trigger (409). Turn off the air compressor and  
disconnect the hose.  
11.  
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: Set the Forward/Reverse Lever (205) so that the anvil turns counterclockwise (reverse).  
12.  
13.  
Place the socket (not included) over the nut you wish to loosen.  
Grip the Impact Wrench firmly with two hands and gently squeeze the Trigger (409).  
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.  
14.  
When the nut is loosened, release the Trigger (409). Turn off the air compressor and  
disconnect the hose.  
15.  
If needed, remove the nut from the socket.  
SKU 91715  
For technical questions, please call 1-800-444-3353  
Page 5  
 
Maintenance  
1.  
Make sure your Impact Wrench is disconnected from the air hose before attempting  
any maintenance.  
2.  
3.  
Wipe the Impact Wrench down with a lint free cloth after each use.  
Make sure the Anvil (105) is clear of dirt or debris. If possible, spray it with compressed  
air before each use.  
4.  
5.  
Annually, or more often if used on a daily basis, use a grease gun (not included), to  
inject grease into the Grease Fitting (410). See FIGURE 3 on page 6.  
If you do not use an inline oiler/filter system, lubricate the tool daily by holding it so that  
the Air Inlet (408) is facing up.Squeeze theTrigger (409), and place one or two drops of  
oil into the Air Inlet (408). Squeezing the Trigger (409) allows the oil to circulate in the  
motor.  
FIGURE 1  
Forward/Reverse  
Lever (205)  
Anvil (105)  
Air Inlet (408)  
Trigger (409)  
FIGURE 2  
FIGURE 3  
Reverse  
Forward  
Grease  
Fitting  
(410)  
Turn the Forward/Reverse Lever (205) all the way  
clockwise for high speed forward.  
Turn it so that it points straight up and down for  
low speed forward (shown above).  
Turn it all the way counterclockwise for reverse.  
REV 03/05  
SKU 91715  
For technical questions, please call 1-800-444-3353  
Page 6  
 
Parts List  
Part  
101  
102  
103  
104  
105  
106  
107  
108  
109  
201  
202  
203  
204  
205  
206  
207  
208  
209  
210  
301  
Description  
Hammer Frame  
Hammer Frame Pin  
Hammer  
Q'ty  
Part  
Description  
Front Bearing Plate  
Cylinder  
Q'ty  
1
1
2
2
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
4
1
302  
303  
304  
305  
306  
307  
308  
401  
402  
403  
404  
405  
406  
407  
408  
409  
410  
411  
412  
1
Rotor  
1
Washer  
Blades  
6
Anvil  
Rear Bearing Plate  
Bearing  
1
O - Ring  
1
Socket Retainer  
Steel Ring  
Pin  
1
Insert Bushing  
O - Ring  
1
Hammer Case Bushing  
Housing  
1
Seal  
1
Handle Grip  
Housing Gasket  
Back Housing  
Forward/Reverse Lever  
O - Ring  
Bushing  
1
Tip Valve  
1
Valve Spring  
Exhaust Deflector  
Air Inlet  
1
1
1
Retaining Ring  
Spring  
Trigger  
1
Grease Fitting  
Spring Pin  
Muffler  
1
Steel Ball  
1
Hex. Bolt  
1
Bearing  
PLEASE READ THE FOLLOWING CAREFULLY  
THE MANUFACTURER AND/OR DISTRIBUTOR HAS PROVIDED THE PARTS DIAGRAM INTHIS  
MANUAL AS A REFERENCE TOOL ONLY. NEITHER THE MANUFACTURER NOR DISTRIBU-  
TOR 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 REPLACE-  
MENTS 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 REPAIRSTO THE ORIGINAL PRODUCT OR REPLACEMENT PARTSTHERETO, OR ARIS-  
ING 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.  
REV 03/05  
SKU 91715  
For technical questions, please call 1-800-444-3353  
Page 7  
 
Assembly Drawing  
REV 03/05  
SKU 91715  
For technical questions, please call 1-800-444-3353  
Page 8  
 

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