Harbor Freight Tools Impact Driver 94803 User Manual

1
/ TWIN HAMMER  
2
IMPACT WRENCH  
94803  
ASSEMBLY ANd OPERATING  
INSTRUCTIONS  
Due to continuing improvements, actual product may differ slightly from the product described herein.  
®
3491 Mission Oaks Blvd., Camarillo, CA 93011  
TO PREVENT SERIOUS INjURY,  
REAd ANd UNdERSTANd ALL WARNINGS  
ANd INSTRUCTIONS BEFORE USE.  
Copyright 2006 by Harbor FreightTools . 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 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. Use clean, dry regulated, compressed air at 90 PSI. Never  
use oxygen, carbon dioxide, combustible gases, or any other bottled gas as a power  
source for this tool.  
SKU 94803  
For technical questions, please call 1-800-444-3353  
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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, property, or bystanders.  
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.  
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
(10) on the Impact Wrench. First, wrap the / ” air connector with pipe thread seal tape  
before threading it into the Inlet (10). Connect the / ” ID Air Source Hose to a quick  
4
3
8
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 94803  
For technical questions, please call 1-800-444-3353  
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Operation (continued)  
Refer to FIGURES 1 and 2 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 impact socket for your needs.  
Push and snap the socket (not included) onto the Anvil (33).  
Note: As shown on FIGURE 2 on page 6, there are two Valve Knobs (3), one for For-  
ward and one for Reverse.  
7.  
8.  
Tighten the nut as tight as you can by hand.  
Place the socket (not included) over the nut you wish to tighten.  
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.  
9.  
Grip the Impact Wrench firmly with two hands and gently squeeze the Trigger (11).  
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  
workpiece and damage the tool, potentially causing the tool to fail, causing serious  
injury. Use other appropriate methods and tools to tighten the nut.  
10.  
11.  
When the nut is tightened, release the Trigger (11). Turn off the air compressor and  
disconnect the hose.  
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: Use the Left Valve Knob for Reverse. See Figure 2 on page 6.  
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 (11).  
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.  
15.  
When the nut is loosened, release the Trigger (11). Turn off the air compressor and  
disconnect the hose.  
If needed, remove the nut from the socket.  
SKU 94803  
For technical questions, please call 1-800-444-3353  
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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 (33) is clear of dirt or debris. If possible, spray it with compressed  
air before each use.  
4.  
If you do not use an inline oiler/filter system, lubricate the tool daily by holding it so that  
the Air Inlet (10) is facing up. Squeeze the Trigger (11), and place one or two drops of  
oil into the Air Inlet (10). Squeezing the Trigger (11) allows the oil to circulate in the  
motor.  
FIGURE 1  
Anvil  
(33)  
Trigger (11)  
Valve Knobs  
(3)  
Air Inlet  
(10)  
FIGURE 2  
Left Valve Knob  
out for Reverse  
Right Valve Knob  
out for Forward  
Turn the Valve Knob (3) for more air flow and more power.  
SKU 94803  
For technical questions, please call 1-800-444-3353  
Page 6  
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Parts List  
Item  
1
description  
Qty.  
1
Item  
22  
23  
24  
25  
26  
27  
28  
29  
30  
31  
32  
33  
34  
35  
36  
37  
38  
39  
40  
41  
description  
Rear End Plate  
Qty.  
1
Housing  
2
Screw  
1
Cylinder  
1
3
Valve Knob  
Oil Window  
Plastic Grip  
Valve Seat  
Throttle Valve  
Valve Spring  
1
Rotor  
1
4
1
Rotor Blade  
Front End Plate  
Washer  
6
5
1
1
6
1
2
7
1
Front Rotor Bearing  
Hammer Pin  
Washer  
1
8
1
2
9
Exhaust Deflector  
Air Inlet  
1
1
10  
11  
12  
13  
14  
15  
16  
17  
18  
19  
20  
21  
1
Hammer  
2
Trigger  
1
Hammer Cage  
Standard Anvil  
O-Ring  
1
Trigger Shaft  
O-Ring  
1
1
2
1
Reverse Valve Bushing  
Reverse Valve  
Steel Ball  
1
Socket Retainer  
Hammer Cage Bushing  
Hammer Case Pilot  
Gasket  
1
1
1
1
2
Spring  
1
1
Dowel Pin  
1
Protector Cover  
Fixed Plate  
1
Gasket  
1
1
Retainer Ring  
Rear Rotor Bearing  
1
Cap Screw  
3
1
PLEASE REAd THE FOLLOWING CAREFULLY  
THE MANUFACTURER AND/OR DISTRIBUTOR HAS PROVIDEDTHE PARTS DIAGRAM INTHIS 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  
OFTHE 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.  
SKU 94803  
For technical questions, please call 1-800-444-3353  
Page 7  
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Assembly diagram and Warranty  
Limited 2Year  
warrantY  
Harbor FreightTools Co.makes every effort to assure that its products meet high quality and durability standards,  
and warrants to the original purchaser that this product is free from defects in materials and workmanship for the  
period of 2 years from the date of purchase. This warranty does not apply to damage due directly or indirectly,  
to misuse, abuse, negligence or accidents, repairs or alterations outside our facilities, or to lack of maintenance.  
We shall in no event be liable for death, injuries to persons or property, or for incidental, contingent, special  
or consequential damages arising from the use of our product. Some states do not allow the exclusion or  
limitation of incidental or consequential damages, so the above limitation of exclusion may not apply to you.THiS  
WarranTy iS expreSSly in lieu oF all oTHer WarranTieS, expreSS or implied, inCluding  
THe WarranTieS oF merCHanTabiliTy and FiTneSS.  
To take advantage of this warranty, the product or part must be returned to us with transportation charges prepaid.  
proof of purchase date and an explanation of the complaint must accompany the merchandise. if our inspection  
verifies the defect, we will either repair or replace the product at our election or we may elect to refund the purchase  
price if we cannot readily and quickly provide you with a replacement. We will return repaired products at our  
expense, but if we determine there is no defect, or that the defect resulted from causes not within the scope of  
our warranty, then you must bear the cost of returning the product.  
This warranty gives you specific legal rights and you may also have other rights which vary from state to state.  
3491 Mission Oaks Blvd. • PO Box 6009 • Camarillo, CA 93011 • (800) 444-3353  
SKU 94803  
For technical questions, please call 1-800-444-3353  
Page 8  
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