Harbor Freight Tools Impact Driver 92849 User Manual

1/4” Air Ratchet Wrench  
92849  
ASSEMBLY AND OPERATING INSTRUCTIONS  
3491 Mission Oaks Blvd., Camarillo, CA 93011  
Copyright © 2005 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 FreightTools.  
For technical questions and replacement parts, please call 1-800-444-3353  
 
6. Dress properly while working. Do not wear loose clothing or jewelry as  
they can be caught in moving parts. Protective, electrically non-conductive  
clothes and non-skid footwear are recommended when working. Wear  
restrictive hair covering to contain long hair.  
7. Use eye and ear protection. Always wear ANSI approved impact safety  
goggles. 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.  
8. Do not overreach. Keep proper footing and balance at all times. Do not  
reach over or across running machines.  
9. Maintain tools with care. Keep tools clean and in good condition for better  
and safer performance. Follow instructions for lubricating and changing  
accessories. Inspect tool fittings and 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 power. Disconnect from air pressure source 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  
connecting it.  
12. Avoid unintentional starting. Be sure the switch is in the Off position when  
not in use and before attaching to pressure source. Do not carry any tool with  
your finger on the trigger, 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 any switch does not turn On and Off properly.  
15. Guard against electric shock when working on electrical equipment.  
Prevent body contact with grounded surfaces such as pipes, radiators,  
ranges, and refrigerator enclosures.  
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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 FreightTools.  
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 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  
regularly by a qualified technician.  
20. You should maintain a proper regulator and moisture trap in your air  
line at all times.  
21. Use compressed air only. Never use combustible gas as a power source.  
Note:Performance of this tool may vary depending on variations in local air pressure.  
Warning:The warnings, cautions, and instructions discussed in this instruction  
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.  
Air Pressure Supply  
We recommend that you use both a filter and an in-line oiler in your air supply  
system as illustrated in the diagram below.These components are not included  
with this tool, abut are available from Harbor FreightTools.  
We recommend that you install a quick-release nipple (not included) into the Inlet  
Connector (15). Quick release connectors at all points that a hose attaches to your  
compressor set up and your tools make working with air powered tools easier and  
more convenient.  
Air Impact  
Wrench  
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Operation  
1. Install a standard 1/4” Air Connector (not included) to the Air Inlet (15). First  
wrap the threaded portion of the 1/4” air connector with pipe thread seal tape  
before threading it into the Air Inlet (15).Tighten securely.  
2. Attach a standard quick connector (not included) to your 3/8” i.d. air pressure  
source hose. Then attach the air hose to the Air Ratchet Wrench.  
NOTE:If you are not using an automatic in-line oiler, add a few drops of pneumatic  
oil to the Air Inlet (15) before attaching the air hose. Add a few more drops of oil  
after every hour of continual use.  
2.  
Set the air pressure regulator of your air compressor at 90 psi.  
WARNING: Do not exceed the recommended pressure of 90 psi.Damage to your  
tool, and possible personal injury may result.  
3. Check the air line and its connections for air leaks. Make note of these, and  
repair them before using this tool.  
NOTE: Turn off your air compressor and disconnect the air pressure hose before  
changing sockets or making any adjustments to this tool. Severe injury or property  
damage may otherwise result.  
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  
be delivered to the work piece.  
4. Select the appropriate size 1/4” square drive impact socket (not included) for  
your needs. Push and snap the socket onto the Ratchet Anvil (42). Caution:  
Use only impact sockets. Standard sockets are not strong enough.  
5. Set the direction of the Air Impact Wrench to “F” (forward) or “R” (reverse).  
Please see photo. By rotating the Reverse Button (38) to the right, you are  
setting the tool to operate FORWARD.  
NOTE: In this booklet, “FORWARD” refers to  
clockwise rotation, and “REVERSE” refers to  
counterclockwise rotation. Always be aware  
of the direction of the threading of the  
fastener you are working on. While most  
fasteners install with clockwise rotation,  
some threads are intentionally the opposite  
of this standard.  
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6. Adjust the Air Regulator (13) to the  
desired torque setting. NOTE: The  
actual torque delivered at each of the  
several torque 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 on a test piece using each  
setting, then observing the resultant  
torque by using a mechanical torque wrench (not supplied).  
Note: Never over-  
tighten the nut or bolt;  
damage may result  
from over-tightening.  
7. If installing a nut or bolt, set it as tight as possible by hand.  
8. Place the impact socket (not included) over the fastener. Grip the Air Ratchet  
Wrench tightly with both hands, and squeeze the trigger (8). The tool will  
operate and tighten the fastener.  
9. When the fastener is tightened, release the Trigger (8), and remove the tool  
from the fastener.  
10. If possible, check the actual torque applied to the fastener with a mechanical  
torque wrench (not supplied). If additional torque is required beyond what is  
delivered by using air pressure, the fastener may be further tightened using  
this tool in the manner of a standard ratchet wrench.  
11. If removing a fastener, rotate the Reverse Button (38) counterclockwise,  
assuming that the fastener is a standard right-hand thread. 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, turn the Reverse Button (38) to  
the right for removal.  
12. Place an appropriate impact socket (not included) over the fastener.Holding  
the Air Ratchet Wrench with both hands, squeeze the Trigger (8). The fastener  
should come off.  
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  
fastener will not come off, DO NOT INCREASE THE AIR PRESSURE to the  
tool beyond 90 psi. This may damage the tool. You may have to use pen-  
etrating 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 Ratchet Wrench away in its proper storage place.  
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Maintenance  
1. Your Air Ratchet Wrench should be kept clean, dry and lightly oiled.  
2. When not in use, store your tool in a suitable place where it will not be  
exposed to water, corrosive materials, or undue banging around.  
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 after every hour of continuous use.  
4. If your tool loses power, or you notice air leaks, take it to a certified technician  
for service.  
Parts List  
Part # Description  
Qty.  
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
2
1
1
4
1
Part # Description  
Qty.  
1
1
1
3
3
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
2
2
1
1
1
2
Housing  
Valve Bushing  
Valve Stem  
O-ring  
25  
26  
27  
28  
29  
30  
31  
32  
33  
34  
35  
36  
37  
38  
39  
40  
41  
42  
43  
44  
45  
46  
47  
48  
Pin  
Ring  
3
Bearing  
4
Pin  
5
Spring  
Gear  
6
O-ring  
Gear Plate  
Thread Ring Gear  
Cap  
7
Valve Plug  
Trigger  
8
9
Trigger Pin  
Handle Cover  
Muffler Cover  
O-ring  
Needle Bearing  
Crankshaft  
Drive Bushing  
Ratchet Housing  
Ratchet Yoke  
Reverse Button  
Spring  
10  
11  
12  
13  
14  
15  
16  
17  
18  
19  
20  
21  
22  
23  
24  
Air Regulator  
O-ring  
Air Inlet  
Set Pin  
Set Pin  
Spring  
Washer  
Bearing  
Ratchet Anvil  
Pin  
End Plate  
Pin  
Ratchet Pawl  
Spring  
Cylinder  
Rotor  
Steel Ball  
Washer  
Rotor Blade  
Front Plate  
Retainer Ring  
NOTE: Some parts are listed and shown for illustration purposes only and are not  
available individually as replacement parts.  
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Assembly Drawing  
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  
STATESTHAT ALL REPAIRS AND PARTS REPLACEMENTS SHOULD BE UNDERTAKEN BY  
CERTIFIED AND LICENSED TECHNICIANS AND NOT BY THE BUYER. THE BUYER AS-  
SUMES ALL RISK AND LIABILITY ARISING OUT OF HIS OR HER REPAIRSTOTHE ORIGI-  
NAL PRODUCT OR REPLACEMENT PARTSTHERETO, OR ARISING OUT OF HIS OR HER  
INSTALLATION OF REPLACEMENT PARTSTHERETO.  
SKU 92849  
Page 8  
 

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