Central Pneumatic 93566 Quick reference guide

ASSEMBLY & OPERATING INSTRUCTIONS
3491 Mission Oaks Blvd., Camarillo, CA 93011
Visit our Web Site at www.harborfreight.com
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 Freight Tools.
For technical questions and replacement parts please call 1-800-444-3353.
Manual Revised 11h
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Due to continuing improvements, actual product may differ slightly from the product described herein.
1/2” IMPACT WRENCH
WITH 2” EXTENDED ANVIL
TO PREVENT SERIOUS INJURY,
READ AND UNDERSTAND ALL WARNINGS
AND INSTRUCTIONS BEFORE USE.
93566

SKU 93566 For technical questions please call 1-800-444-3353. Page 2
THANK YOU for choosing a HARBOR FREIGHT TOOLS product. For future reference, please
complete the owner’s record below:
Model______________ Serial No._____________ Purchase Date_______________
SAVE THE RECEIPT, WARRANTY AND THESE INSTRUCTIONS. It is important that you read the
entire manual to become familiar with the unit BEFORE you begin assembly.
Technical Specications
Material: Cast aluminum housing
Extended Anvil: 2”
Drive Size: 1/2” Square drive
Maximum Torque: 250 Ft. Lbs.
Air Inlet Size: 1/4”-18 NPT
Recommended Air Pressure: 90 PSI
Impact Mechanism: Rocking Dog
Hose I.D.: 3/8”
RPM: 7000
Blows Per Minute: 700
Regulator Settings: (4) Forward; (1) Reverse
Air Consumption: 4 SCFM
Safety Warnings and Precautions
WARNING: When using product, basic safety precautions should always be followed to
reduce the risk of personal injury and damage to equipment.
Read all instructions before using this product!
1. Keep work area clean. Cluttered areas invite injuries.
2. Observe work area conditions. Do not use machines or power tools in damp or wet
locations. Don’t expose to rain. Keep work area well lighted. Do not use electrically powered
compressors in the presence of ammable gases or liquids.
3. Keep children away. Children must never be allowed in the work area. Do not let them
handle machines, tools, extension cords, or air hoses.
4. Store idle equipment. When not in use, tools must be stored in a dry location to inhibit rust.
Always lock up tools and keep out of reach of children.
5. Use the right tool for the job. Do not attempt to force a small tool or attachment to do
the work of a larger industrial tool. There are certain applications for which this tool was
designed. It will do the job better and more safely at the rate for which it was intended. Do
not modify this tool and do not use this tool for a purpose for which it was not intended.
6. Dress properly. Do not wear loose clothing or jewelry as they can be caught in moving parts.
Protective, electrically nonconductive clothes and nonskid footwear are recommended when
working. Wear restrictive hair covering to contain long hair.

SKU 93566 For technical questions please call 1-800-444-3353. Page 3
7. Use eye and ear protection. Always wear ANSI approved impact safety goggles
and hearing protection. Wear a full face shield if you are producing metal lings 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 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 nger 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 xtures; and
any other condition that may affect proper operation. Any part that is damaged should be
properly repaired or replaced by a qualied 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 inuence of alcohol or drugs. Read warning labels if
taking prescription medicine to determine if your judgement or reexes 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 re, 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 qualied
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, property or bystanders.

SKU 93566 For technical questions please call 1-800-444-3353. Page 4
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: Some dust created by power sanding, sawing, grinding, drilling, and other
construction activities, contain chemicals known [to the State of California] to cause cancer,
birth defects or other reproductive harm. Some examples of these chemicals are:
• Lead from lead-based paints
• Crystalline silica from bricks and cement or other masonry products
• Arsenic and chromium from chemically treated lumber
Your risk from these exposures varies, depending on how often you do this type of work.
To reduce your exposure to these chemicals: work in a well ventilated area, and work with
approved safety equipment, such as those dust masks that are specially designed to lter
out microscopic particles. (California Health & Safety Code 25249.5, et seq. )
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.
Unpacking
When unpacking, check to make sure the parts listed on page 7 are included. If any parts are missing
or broken, please call HARBOR FREIGHT TOOLS at 1-800-444-3353.
Impact Wrench
with Extended
Anvil
Operation
For best service you should incorporate an oiler, regulator, and inline lter, as shown in the diagram
above. Hoses, couplers, oilers, regulators, and lters are all available at Harbor Freight Tools.
1. You will need to prepare a 1/4” air connector (not included) to connect to the Air Inlet (10) on the
Impact Wrench. First, wrap the 1/4” air connector with pipe thread seal tape before threading
it into the Air Inlet (10). Connect the 1/2” ID Air Source Hose to 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. Set the air pressure on the regulator to 90 PSI. Do not exceed the recommended air pres-
sure of 90 PSI.
3. Check the air connection for leaks. Disconnect from the air source.

SKU 93566 For technical questions please call 1-800-444-3353. Page 5
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 3on 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. Select the appropriate size 1/2” drive socket (not included) for your needs.
5. Push and snap the socket onto the Anvil (18).
6. To operate the Air Regulator (12), follow the directions in FIGURE 2 on page 6.
Note: Set the Forward/Reverse Valve (3) so that the Anvil (18) turns clockwise (forward)
- see FIGURE 3 on page 6.
7. Tighten the nut as tight as you can by hand.
8. Place the socket over the nut you wish to tighten.
9. Grip the Impact Wrench rmly with two hands and gently squeeze the Trigger (4).
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 dam-
age 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 (4). Turn off the air compressor and disconnect
the hose.
11. If available, check the recommended torque specication 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 Valve (3) so that the anvil turns counterclockwise (reverse)- see
Figure 3.
12. Place the socket (not included) over the nut you wish to loosen.
13. Grip the Impact Wrench rmly with two hands and gently squeeze the Trigger (4).
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 (4). Turn off the air compressor and disconnect
the hose.
15. 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. Wipe the Impact Wrench down with a lint free cloth after each use.
3. Make sure the Anvil (18) is clear of dirt or debris. If possible, spray it with compressed air
before each use.

SKU 93566 For technical questions please call 1-800-444-3353. Page 6
Maintenance (Cont’d)
4. Weekly, or more often if used on a daily basis, use a grease gun (not included), to inject
grease into the Grease Fitting. Put in only a drop or two. See FIGURE 3.
5. If you do not use an inline oiler/lter system, lubricate the tool daily by holding it so that
the Air Inlet (10) is facing up. Squeeze the Trigger (4), and place one or two drops
of oil into the Air Inlet (10). Squeezing the Trigger (4) allows the oil to circulate in the
motor.
Air Regulator (12)
Air Inlet (10)
Trigger (4)
Anvil (18)
Figure 1
Figure 2
The Air Regulator (12) has an index from 1 to 4.
Push and turn the Air Regulator (12) to a higher
number, 3 or 4, for more air ow and more power.
Push and turn it to a lower number, 2 or 1, for less
power.
4
3
2Forward Reverse
Grease Fitting
Figure 3
1
F
R

SKU 93566 For technical questions please call 1-800-444-3353. Page 7
Parts List
Part # Description Quantity Part # Description Quantity
1 Housing 1 24 Cylinder 1
2 Valve Sleeve 1 25 Rotor 1
3 Forward/Reverse Valve 1 26 Rotor Blade 6
4 Trigger 1 27 Front End Plate 1
5 Pin 1 28 Ball Bearing 1
6 Bushing 1 29 Rear End Plate 1
7 Valve Stem 1 30 Pin 1
8 Ball Bearing 1 31 Spring 1
9 Spring 1 32 Pin 1
10 Air Inlet 1 33 Rear Gasket 1
11 Screen 1 34 Rear Cover 1
12 Air Regulator 1 35 Washer 4
13 O Ring 1 36 Screw 4
14 Spring 1 37 Rubber Sleeve 1
15 Oil Seat 1 38 Exhaust Deector 1
16 Screw 1 38-1 Brass Silencer 1
17 Anvil Bushing 1 39 Screw 1
18 Anvil (1/2”) 1 40 Screw 2
19 Hammer Cage 1 41 Anvil Collar 1
20 Hammer Pin 1 42 O Ring 1
21 Hammer Dog 1 43 Rubber 1
22 Drive Cam 1 44 Screw 1
23 Pin Cylinder 1
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 STATES THAT 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 93566 For technical questions please call 1-800-444-3353. Page 8
Parts/Assembly Diagram
90 Day Warranty
Harbor Freight Tools 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 90 days 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, criminal activity, improper installation,
normal wear and tear, 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 veries 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 specic legal rights and you
may also have other rights which vary from state to
state.