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.
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.
Page 3
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.
Page 4
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.
Page 5
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.
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
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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