Harbor Freight Tools Cordless Sander 93742 User Manual

6” Random Orbit  
Palm Sander  
93742  
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  
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.  
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and nonskid 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 tool must be kept clean, dry,  
and free from oil and grease at all times.  
10. Disconnect Air Hose before maintenance. Never service the Sander, clear  
jams, or disassemble with the air hose attached. Disconnect the Sander 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 valve lever is in the Off position  
when not in use and before attaching to pressure source.  
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 the trigger does not  
operate properly.  
15. 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.  
16. Compressed air only. Never use combustible gas as a power source.  
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.  
SKU 93742 For technical questions, please call 1-800-444-3353.  
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18. Use proper size and type air pressure line and fittings. The recommended  
air line for this tool is 3/8” ID delivering no more than 90 PSI.  
19. Maintenance. For your safety, service and maintenance should be performed  
regularly by a qualified technician.  
20. Disconnect air supply before adjusting Sander or replacing Sanding Pad.  
Before making any adjustments to the Sander make sure that the compressed  
air is disconnected.  
21. Use Sander on an appropriate work surface only. Test sander on a test  
scrap of material before sanding the workpiece. Always wear ANSI approved  
safety goggles during use and maintenance.  
22. 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  
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.)  
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 following parts are included.  
Palm Random Orbital Sander  
6” Backing Pad  
22 mm Chrome Plated Flat Wrench  
If any parts are missing or broken, please call Harbor Freight Tools at the number  
on the cover of this manual.  
SKU 93742 For technical questions, please call 1-800-444-3353.  
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Air Pressure Supply  
This tool is designed to operate with a maximum air pressure of 90 PSI.You must  
use an air regulator, set at 90 PSI or below.  
In use, this tool will use, on average, 7 Cubic Feet per Minute of compressed air  
at 90 PSI. For satisfactory performance, you must use an air compressor capable  
of delivering this volume of air at the stated pressure.  
We recommend that you use both a filter and an inline oiler in your air supply  
system as illustrated in the diagram below. These components are not included  
with this tool, but are available from Harbor Freight Tools.  
If you do not use a filter and inline oiler, put a few drops of water displacement oil  
into the air line before each use. After each use, the Palm Sander should be  
carefully drained of collected moisture and sprayed with a water displacement oil.  
We recommend that you install a quick-release nipple (not included) into the  
Regulator. Quick release connectors at all points in an air pressure system make  
your work easier.  
Air  
Sander  
Operation  
Installing the Sanding Pad  
1. Disconnect the air hose from the tool.  
2. Select the appropriate sanding pad (not included), and press it onto the  
Backing Pad (31). NOTE:You should always start with a sanding pad coarse  
enough to remove saw marks and do preliminary shaping of the workpiece.  
Then sand the workpiece with progressively finer grit sanding pads until the  
desired surface is achieved. Do not move directly from a coarse grit sanding  
pad to a much finer grit sanding pad. Doing so wastes time and causes  
additional wear on you and the tool.  
SKU 93742 For technical questions, please call 1-800-444-3353.  
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3. Press sanding pad onto a piece of scrap material, and operate tool briefly.This will  
seat sanding pad firmly on Backing Pad (31).Failure to seat sanding pad may  
cause sanding pad to come loose, possibly causing personal injury or property  
damage.  
Using the tool  
CAUTION:Whenever using this tool wear ANSI approved safety goggles.  
4. Turn the air compressor (not included) on and allow the air tank to come up  
to pressure. Set the compressor output regulator to no more than 90 PSI.  
5. Attach the air supply hose (not included) to the tool.  
6. Grip the base of the tool in one hand.The Valve Lever (1) will be under your  
palm. Squeeze the tool to depress the Valve Lever (1) and the tool will operate.  
7. Place the tool on the work surface to begin sanding.  
8. To stop sanding, lift the tool from the work surface, and relax your grip to  
allow the Valve Lever (1) to lift into the closed position.  
9. When you are done work, disconnect the air pressure hose from the tool,  
and turn off the air compressor.  
Removing Sanding pad  
1. Disconnect air pressure hose from tool.  
2. Hold tool with sanding pad upward. Peel sanding pad from Backing Pad (31).  
NOTE: Do not store tool with sanding pad in place. Heat generated during  
sanding may cause pad to bond to Backing Pad, making subsequent removal  
difficult.  
Skirt (30)  
Removing Backing Pad (31)  
1. Disconnect tool from air supply.Slide  
Wrench (36) under Skirt (30) as  
shown in photo at right. Engage  
Wrench with Pad Retainer (38).  
2. HoldingWrench firmly, rotate Backing  
Pad (31) counterclockwise to remove.  
Backing Pad (31)  
Wrench (36)  
Page 6  
SKU 93742 For technical questions, please call 1-800-444-3353.  
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Replacing Backing Pad (31)  
1. Disconnect air pressure hose from tool  
2. Place Wrench (36) onto Pad Retainer (38) and hold firmly.  
3. Place Backing Pad (31) on Pad Retainer (38) and turn clockwise to attach.  
Hand tighten firmly.  
Maintenance  
1. Place a few drops of light weight air tool oil (not included) into the Regulator  
each time before using the tool.  
2. After each use, drain any accumulated moisture from the tool, and spray a  
small amount of water displacing oil into and on the tool. Wipe clean.  
3. Store tool in a safe location out of reach of children and unauthorized  
persons.  
Troubleshooting  
Tool will not operate.  
1. Possible cause: Low or no air pressure.  
Solution: Check air compressor to be sure it is operating properly. Check Air  
Regulator. Check air lines for leaking or blockage.  
2. Possible cause: Corroded Rotor (39).  
Solution: Spray light weight penetrating oil into the Regulator. If tool still  
won’t operate, take it to a qualified service technician for repair.  
3. Possible Cause: Damaged Seals or O rings.  
Solution: Take it to a qualified service technician for repair.  
PLEASE READTHE 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 ORWARRANTY OF ANY KINDTOTHE BUYER  
THAT HE OR SHE IS QUALIFIEDTO MAKE ANY REPAIRSTOTHE PRODUCT ORTHAT 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 93742 For technical questions, please call 1-800-444-3353.  
Page 7  
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Parts List  
Part  
1
Description  
Valve Lever  
QTY.  
1
Part  
Description  
QTY.  
1
Part  
Description  
QTY.  
1
16 Upper Bearing Case  
17-1 Cylinder  
27 Base Ring  
2
Spring Pin Ø3x25mm  
Body Cover  
1
1
28 Cap Screw (M4x12)  
29 Screw (M4x12)  
30 Skirt  
4
3
1
17-2 Spring Pin Ø3x5mm  
17-3 O-Ring P7  
1
1
4
Body  
1
1
1
5
Valve Pin Sleeve  
Wave Washer 12mm  
O-Ring P8  
1
17-4 Spring Pin Ø3x5mm  
17-5 Spring Pin Ø3x5mm  
18 Lower Bearing Case  
19 Bearing (6000ZE)  
20 Shaft w/Head (A)  
21 H/R Key (3x13)  
22 Bearing (60012RS)  
23 Felt Ring (Ø18)  
24 Dust Seal  
1
31 6" Backing Pad  
32 Silencer Set  
33 Upper Side Plate  
34 Lower Side Plate  
35 Screw (M5x10)  
36 Flat Wrench  
37 Ball Bearing (688ZE)  
38 Pad Retainer  
39 Rotor  
1
6
1
1
1
7
2
1
1
8
O-Ring P4 x Ø7mm  
Valve  
1
1
1
9
1
1
1
10 Valve Spring  
11 Pin Ø3x22mm  
12 Inlet  
1
1
1
1
1
1
1
1
1
13 Screw m5x10  
14 Conical Washer m5  
15 (Bearing 6000ZE)  
1
1
1
1
25 Snap Ring (NR28)  
26 Body Gasket  
1
40 Vane  
5
1
1
Assembly Drawing  
SKU 93742 For technical questions, please call 1-800-444-3353.  
Page 8  
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