Harbor Freight Tools Impact Driver 93821 User Manual

1/4” MINI RATCHET WRENCH  
model 93821  
SET UP AND OPERATING INSTRUCTIONS  
Diagrams within this manual may not be drawn proportionally.  
Due to continuing improvements, actual product may differ slightly from the product described herein.  
Distributed exclusively by harbor Freight tools®.  
3491 Mission Oaks Blvd., Camarillo, CA 93011  
Read this material before using this product.  
Failure to do so can result in serious injury.  
Save thiS manual.  
Copyright© 2007 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 or replacement parts, please call 1-800-444-3353.  
Rev 07k  
 
WORK AREA  
1.  
2.  
Keep your work area clean and well lit. Cluttered benches and dark areas  
invite accidents.  
Do not operate pneumatic tools in explosive atmospheres, such as in the  
presence of flammable liquids, gases, or dust. Pneumatic tools create sparks  
which may ignite flammables.  
3.  
Keep bystanders, children, and visitors away while operating a pneumatic  
tool. Distractions can cause you to lose control. Protect others in the work area  
from debris such as chips and sparks. Provide barriers or shields as needed.  
PERSONAL SAFETY  
1.  
Stay alert. Watch what you are doing, and use common sense when  
operating a pneumatic tool. Do not use a pneumatic tool while tired or  
under the influence of drugs, alcohol, or medication. A moment of  
inattention while operating pneumatic tools may result in serious personal injury.  
2.  
3.  
Dress properly. Do not wear loose clothing or jewelry. Contain long hair.  
Keep your hair, clothing, and gloves away from moving parts. Loose  
clothes, jewelry, or long hair can be caught in moving parts.  
Avoid accidental starting. Be sure the Throttle Lever (11) is off before  
connecting to the air supply. Carrying pneumatic tools with your finger on the  
Throttle Lever, or connecting pneumatic tools to the air supply with the Throttle  
Lever on, invites accidents.  
4.  
Remove adjusting keys or wrenches before turning on the tool. A wrench  
or a key that is left attached to a rotating part of the tool may result in personal  
injury.  
5.  
6.  
Do not overreach. Keep proper footing and balance at all times. Proper  
footing and balance enables better control of the tool in unexpected situations.  
Use safety equipment. Always wear ANSI approved safety impact eye  
goggles, hearing protection, and heavy duty work gloves.  
TOOL USE AND CARE  
1.  
Use clamps or other practical ways to secure and support the workpiece to  
a stable platform. Holding the work by hand is unstable and may lead to loss of  
control. Only work on a workpiece that is properly secured.  
SKU 93821  
For technical questions, please call 1-800-444-3353  
PAGE 3  
 
2.  
3.  
Do not force the tool. Use the correct tool for your application. The correct  
tool will do the job better and safer at the rate for which it is designed.  
Do not use the power tool if the Throttle Lever does not turn it on or off.  
Any tool that cannot be controlled with the Throttle Lever is dangerous and must  
be replaced.  
4.  
Disconnect the air hose from the tool before making any adjustments,  
changing accessories, or storing the tool. Such preventive safety measures  
reduce the risk of starting the tool accidentally.  
5.  
6.  
Store idle tools out of reach of children and other untrained persons. Tools  
are dangerous in the hands of untrained users.  
Maintain tools with care. Do not use a damaged tool. Tag damaged tools “Do  
not use” until  
repaired.  
7.  
8.  
Check for misalignment or binding of moving parts, breakage of parts,  
and any other condition that may affect the tool’s operation. If damaged,  
have the tool serviced before using. Many accidents are caused by poorly  
maintained tools.  
Use only accessories that are recommended by the manufacturer for your  
model. Accessories that may be suitable for one tool may become hazardous  
when used on another tool.  
SERVICE  
1.  
2.  
Tool service must be performed only by qualified repair personnel. Service  
or maintenance performed by unqualified personnel could result in a risk of injury.  
When servicing a tool, use only identical replacement parts. Follow  
instructions in the “Inspection, Maintenance, And Cleaning” section of this  
manual. Use of unauthorized parts or failure to follow maintenance instructions  
may create a risk of injury.  
SPECIFIC SAFETY RULES  
1.  
2.  
Maintain labels and nameplates on the Ratchet Wrench. These carry  
important information. If unreadable or missing, contact Harbor Freight Tools for  
a replacement.  
CAUTION! To avoid injury, grip the Ratchet Wrench firmly with both hands.  
SKU 93821  
For technical questions, please call 1-800-444-3353  
PAGE 4  
 
3.  
4.  
5.  
Use clean, dry, regulated, compressed air at 90 PSI. Do not exceed the  
recommended 90 PSI. Never use oxygen, carbon dioxide, combustible gases, or  
any other bottled gas as a power source for this tool.  
When connecting to the air supply: Prior to each use, if an automatic oiler is  
not used, add two drops of air tool oil (not included) into the Air Inlet (10) fitting of  
the Ratchet Wrench.  
Always disconnect the Ratchet Wrench from its compressed air supply  
source, and squeeze the Throttle Lever (11) to release all compressed air in  
the tool before performing any maintenance or services.  
6.  
7.  
Industrial applications must follow OSHA requirements.  
WARNING! The brass components of this product contain lead, a  
chemical known to the State of California to cause birth defects (or other  
reproductive harm). (California Health & Safety code 25249.5, et seq.)  
8.  
WARNING! The warnings, precautions, and instructions discussed in this  
manual cannot cover all possible conditions and situations that may occur. The  
operator must understand that common sense and caution are factors which can-  
not be built into this product, but must be supplied by the operator.  
ASSEMBLY AND OPERATING INSTRUCTIONS  
NOTE:  
For additional references to the parts listed in the  
following pages, refer to the Assembly Diagram on page 9.  
To Attach A Quick Connector:  
1.  
Prior to use, the Ratchet Wrench requires the attachment of a Quick Connector  
(not included) into its Air Inlet (10). To do so, wrap approximately 3” of pipe  
thread sealer tape (not included) around the male threads of a Quick Connector.  
Then, firmly tighten the Quick Connector into the Air Inlet. (See Figure A.)  
SKU 93821  
For technical questions, please call 1-800-444-3353  
PAGE 5  
 
Recommended Compressed Air System Set-Up:  
1.  
For best service, you should incorporate an oiler, regulator, and inline filter when  
using an air compressor (not included) to operate the Ratchet Wrench.  
(See Figure B.)  
RECOMMENDED COMPRESSED AIR SYSTEM SET-UP  
ATTACH  
QUICK CONNECTOR  
TO RATCHET WRENCH  
FIGURE B  
To Operate The Ratchet Wrench:  
1.  
The Ratchet Wrench is designed to work with all 1/4” drive sockets (not included).  
Before installing a socket, make sure your hand is away from the Throttle Lever  
(11). When installing a socket onto the Drive Head of the Ratchet Wrench,  
always make sure the socket is firmly secured in the Drive Head.  
(See Figure C, next page.)  
2.  
3.  
After installing a socket onto the Drive Head of the Ratchet Wrench, set the  
Forward/Reverse Knob (33) to the direction in which you wish the Ratchet to  
turn (Forward = clockwise rotation / Reverse = counterclockwise rotation).  
(See Figure C.)  
Connect the air supply hose to the Ratchet Wrench. Turn on the air compressor,  
and set its regulator to the recommended 90 PSI for the Ratchet Wrench.  
4.  
5.  
Insert the socket onto the bolt or nut that is to be loosened/tightened.  
Make sure to hold the Ratchet Wrench firmly with both hands, as torque will  
cause the tool to twist. Then gently squeeze the Throttle Lever (11) to tighten  
or loosen the bolt/nut. Apply additional pressure on the Throttle Lever (11) as  
needed. (See Figure C.)  
SKU 93821  
For technical questions, please call 1-800-444-3353  
PAGE 6  
 
6.  
7.  
If necessary, use a torque wrench (not included) to verify the desired torque of  
a bolt/nut. If a bolt/nut requires a higher torque level than that produced by the  
Ratchet Wrench at 90 PSI, an alternate means (other than the Ratchet Wrench)  
of achieving the desired torque should be used.  
When finished, release the Throttle Lever (11) to stop the Ratchet Wrench.  
(See Figure C.)  
8.  
9.  
Turn off the air compressor. Disconnect the Ratchet Wrench from its air supply  
hose, and remove the socket from the tool.  
Make sure to store the Ratchet Wrench in a dry, clean, location out of reach of  
children and other unauthorized users.  
INSPECTION, MAINTENANCE, AND CLEANING  
1.  
2.  
WARNING! Always make sure the Throttle Lever (11) is in its “OFF”  
position, and disconnect the Ratchet Wrench from its compressed air supply  
before performing any inspection, adjustments, maintenance, or cleaning.  
Before each use, inspect the general condition of the Ratchet Wrench. Check  
for loose screws, misalignment or binding of moving parts, cracked or broken  
parts, damaged air hoses, and any other condition that may affect its safe  
operation. If abnormal noise or vibration occurs, have the problem corrected  
before further use. Do not use damaged equipment.  
SKU 93821  
For technical questions, please call 1-800-444-3353  
PAGE 7  
 
3.  
4.  
Daily: With a soft brush, cloth, or vacuum, remove all dust and debris from  
the Ratchet Wrench. Then, use a premium quality, lightweight machine oil to  
lubricate all external moving parts.  
CAUTION! All maintenance, service, or repairs not listed in this manual are  
only to be attempted by a qualified service technician.  
PLEASE READ THE FOLLOWING CAREFULLY  
THE MANUFACTURER AND/OR DISTRIBUTOR HAS PROVIDED THE PARTS LIST AND ASSEMBLY DIAGRAM IN  
THIS MANUAL AS A REFERENCE TOOL ONLY. NEITHER THE MANUFACTURER OR 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.  
PARTS LIST  
Part #  
1
2
3
4
5
6
7
8
Description  
Motor Housing  
Valve Bushing  
O Ring  
O Ring  
Throttle Valve  
Spring  
Part #  
22  
23  
24  
25  
26  
27  
28  
29  
30  
31  
33  
34  
35  
36  
37  
38  
39  
40  
41  
42  
43  
Description  
Planet Gear  
Planet Pin  
Gear Cage  
Internal Gear  
Clamp Nut  
Ratchet Housing  
Needle Bearing  
Drive Bushing  
Ratchet Yoke  
Washer  
Forward/Reverse Knob  
Reverse Spring  
Reverse Pin  
¼” Ratchet Anvil  
Ratchet Pawl  
Pin  
O Ring  
Air Valve Cap  
Exhaust Sleeve  
Air Inlet  
Throttle Lever  
Bearing  
Rear End Plate  
Pin  
Pin  
Cylinder  
Rotor  
Rotor Blade  
Front End Plate  
Roll Pin  
9
10  
11  
12  
13  
14  
15  
16  
17  
18  
19  
20  
21  
Spring  
Ball  
Thrust Washer  
Retaining Ring  
Grip  
Bearing  
SKU 93821  
For technical questions, please call 1-800-444-3353  
PAGE 8  
 
ASSEMBLY DIAGRAM  
NOTE:  
Some parts are listed and shown for illustration purposes only,  
and are not available individually as replacement parts.  
SKU 93821  
For technical questions, please call 1-800-444-3353  
PAGE 9  
 
limiteD 1 YeaR 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 one year 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, 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 com-  
plaint 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 93821  
For technical questions, please call 1-800-444-3353  
PAGE 10  
 

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