ASTRO ONYX 325 User manual

325/325P
6" FINISHING PALM SANDER
- 3/32" STROKE
WARNING
Study, understand and follow all instructions provided with this product.
Read these instructions carefully before installing, operating, servicing or
repairing this tool. Keep these instructions in a safe accessible place.
1 YEAR LIMITED WARRANTY
• Astro Pneumatic Tool Co. warrants our products to the original user against defective material or workmanship for a
period of 1 year from the date of 1st use. Astro reserves the right to determine whether the product failed because of
defective material, workmanship or other causes and to charge back for missing parts. Astro Pneumatic Tool Co., at its
discretion, will repair products covered under this warranty free of charge. The original user is to return the product (with
the exceptions listed below) with the distributor’s name, address, adequate proof of date of purchase or a copy of warran-
ty card, and a short note explaining the problem. Failures caused by accident, alteration, or misuse are not covered
by this warranty.
• Astro Pneumatic Tool Co. or its authorized service representatives must perform all warranty repairs. Any repair to the
product by unauthorized service representatives voids this warranty. The rights under this warranty are limited to the
original user and may not be transferred to subsequent owners.
• This warranty is in lieu of all other warranties, expressed or implied, including warranties of merchantability and fitness for
a particular purpose. Some states do not allow the exclusion of limitations of incidental or consequential damages so the
above limitations may not apply to you.
PLEASE DO NOT RETURN ANY PRODUCT WITHOUT CALLING 1-800-221-9705 FOR INSTRUCTIONS

02
6" Finishing Palm Sander - 3/32" Stroke
325/325P
INTENDED USE OF THE TOOL
This sander is designed for sanding metal, plastic and painted surfaces to strip paint for fine finishes.
Do not use this tool outside of the designed intent. Never modify the tool for any other purpose or use.
BEFORE USE
Before use, check the parts diagram and part number listing on page 5 to make sure all parts are
included. If any parts are missing or damaged, please call your distributor.
SPECIFICATIONS:
Pad Size: 6"
Free Speed: 10,000rpm
Overall Length: 7" (17.78cm)
Net Weight: 1.5lbs. (.68kg)
Spindle Thread Size: 5/16" x 24
PRODUCT INFORMATION
Air Inlet Thread NPT: 1/4" (6mm)
Air Hose I.D. Size: 3/8" (10mm)
Avg. Air Consumption: 5.5cfm
Air Pressure: 90psi
CAUTION: TO HELP PREVENT PERSONAL INJURY.
• Use of this product can expose you to chemicals such as phthalates which are known to the State of
California to cause cancer, and birth defects or othe reproductive harm. For more information go to
www.P65Warnings.ca.gov/product.
Always wear ANSI approved safety equipment, safety glasses and clothing when using this product.
Study, understand, and follow all instructions provided with this product. Failure to read and follow
all warnings and operating instructions may result in damages and serious injury or death.
• Always wear ANSI approved goggles when using this product. (Users and Bystanders).
• Never use this tool for any application other than for which it was designed.
• Only use accessories designed for this tool.
• Never alter or modify this tool in any way.
• Improper operation and/or maintenance of the tool, modification of the tool, or use of the tool with
accessories not designed for it could result in serious injury or death.
• Always select the correct accessories of the correct size and design for the job that you are
attempting to perform.
• Always work in a clean, safe, well-lit, organized and adequately equipped area.
• Do not begin repairs without assurance that vehicle is in secure position, and will not move during repair.
• Users of this tool should review the chemical composition of the work surface and any products used in
conjunction with this tool for any such chemicals prior to engaging in any activity that creates dust
and/or microscopic particles.
• Users should obtain the Material Safety Data Sheets for all identified chemicals, either from the manu-
facturer or their employer, and proceed to study, understand, and follow all instructions and warnings
for exposure to such chemicals.
• Some examples of these chemicals are: lead from lead based paints; crystalline silica from bricks,
cement and other masonry products; and arsenic and chromium from chemically treated lumber. A
listing of the chemicals can be obtained at www.oehha.ca.gov under Propoisition 65.
• In order to reduce their exposure to such chemicals, users should always:
- work in well-ventilated areas.
WARNING
- wear appropriate safety equipment and clothes that are
specifically designed to filter out microscopic particles.
• Sealed Bearings for Extended Life
• 3/32" (2.5mm) stroke finish
• Super lightweight (1.5lbs.) and compact for
minimum operator fatigue
• Built-in speed regulator
• Low noise and vibration design
• Accessories: #4606 - 6" PU Velcro Backing Pad
#4608 - 6" PSA Backing Pad

• The tool shall not be used in potentially explosive atmospheres.
• Disconnect the air hose before changing or adjusting any inserted tools.
• Before using tool, please confirm all couplings and plugs are fixed securely. An air hose that is under
pressure may lash out when disconnected and could lead to serious injuries.
• Prevent loose clothes, long hair or any other personal accessories from coming close to moving
parts to reduce the risk of being caught, trapped or drawn into the rotating spindle.
• Excessive high air pressure that exceeds the maximum pressure may cause injuries to user.
• Exposure to strong vibration for extended time may cause harm to operator.
• Be aware of the rotation direction before starting the tool to reduce hazardous situations due to unex-
pected rotation direction.
• WATCH YOUR STEP! Leaving excess hose unattended near working area or walk path could
result in injury or death.
• Wearing eye/face protection could reduce the danger to person from high speed splinters being emit-
ted from the tool or work surface.
• Wearing correct breathing protection will help avoid inhaling dust or debris from work process that can
be harmful to your health.
• High sound levels can cause permanent hearing loss. Use hearing protection while operating tool.
• Due to the material being processed, there may be a risk of explosion or fire. Be aware of work surface
dangers prior to beginning work.
• There is a risk of being cut due to high speed rotation. Do not touch high speed rotating disc.
• This power tool is not insulated. If contact is made with an electric current, injury may occur.
• Dust created by sanding, sawing, grinding, drilling and other related activities may expose the user to
dust and/or microscopic particles that may contain chemicals known to the State of California to cause
cancer, birth defects or other reproductive harm.
03
325/325P
MAINTENANCE INSTRUCTION
LUBRICATION:
Before connection of the hose, apply 4 to 5 drops
of a good quality air tool oil at the air inlet.
After 3 to 4 hours of operation, oiling may be
necessary again.
TIGHTNESS OF PARTS:
Regularly check whether all connection parts are
fastened securely. Follow this procedure daily
before beginning work.
DISPOSAL:
Follow national legislation of waste disposal.
STORAGE:
Avoid storing the tool in a location subject to high
humidity. If the tool is left unused, the residual
moisture inside the tool can cause rust. Before
storing and after operation, oil the tool at the air
inlet with a good quality air tool oil and run it for a
short period.
ORDERING SERVICE PART:
For further operational and handling information or
for replacement of parts and components, contact
the sales agent from where you purchased the tool,
or the service division of our company, phone
number 800-221-9705.
* When ordering parts and components, give
each part number, name, and quantities.
WARNING
6" Finishing Palm Sander - 3/32" Stroke

Pitch Pipe Back
Toward Air Receiver
Oil and Water Extractor should be at least 25 ft. from the compressor.
Further if possible.
Oil and Water
Extractor
PIPE SIZE, I.D. (Inches)
04
325/325P
SUGGESTED AIR LINE CONNECTION
The oil and water extractor should not be mounted on or near the air compressor.
The temperature of air is greatly increased during compression. As the air cools down to room tempera-
ture, in the air line, on its way to the Air Power Tool, the moisture contained in it condenses. Thus, for
maximum effectiveness, the oil and water extractor should be mounted at some point in the air supply
system where the temperature of the compressed air in the line is likely to be lowest.
Air lines must be properly drained daily. Each low point in an air line acts as a water trap. Such points
should be fitted with an easily accessible drain. See diagram below. Pitch all air lines back towards the
compressor so that condensed moisture will flow back into the air receiver where it can be drained off.
Drain daily.
Install Drain
at Each Low Point
COMPRESSOR UNIT
Drain Daily
Drain Daily
Drain Daily
25 FEET OR MORE
Air Flow
(CFM)
10
20
30
40
50
70
50
1/2"
3/4"
3/4"
1"
1"
1"
100
3/4"
3/4"
3/4"
1"
1"
1"
150
3/4"
3/4"
1"
1"
1"
1-1/4"
200
3/4"
1"
1"
1"
1-1/4"
Length of Pipe (feet)
6" Finishing Palm Sander - 3/32" Stroke

Call 1.800.221.9705 for questions concerning performance of the product or other inquiries.
05
325/325P
PARTS BREAKDOWN
6" Finishing Palm Sander - 3/32" Stroke
Parts List
Index Part No. Description QtyIndex Part No. Description Qty
1
1A
3
3A
4
5
6
7
8
9
10
11
12
13
13A
14
15
16
17
18
19
20
21
22
23
24
25
26
322-01
322-1A
322-3N
322-3AN
322-4N
3022-11
3022-12
3022-13
322-08
3014-10
3022-07A
3022-04
3014-04
3022-08
322-13A
3014-13A
322-15
3022-18
3022-19
3022-21
3022-20
3022S-23
3022S-22
3022S-24
3022-25
3022-26
3022-27
3022-28
Housing
Wrist Rest
Silencer Cover
Muffler
Brass Silencer
Spacer
Controller
Spring
O-Ring
Inlet Bushing
Pin
O-Ring
Regulator
Pin
Pin
Lever (For 325 & 325P)
Cover
Retaining Ring
Ball Bearing
Pin
Rear Plate
Rotor Blade
Plastic Rotor
Cylinder
O-Ring
Front Plate
Ball Bearing
O-Ring
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
5
1
1
1
1
1
1
Index Part No. Description Qty
27
30
31
32
33
34
35
36
37
38
38
42
3022-29
3025S-32
3022-41
3022-44
3022-45
3022S-33
3022-35
3022-36
3022S-37
4606
4608
3022-40
Cover Locker
Rotor Shaft (For 325P & 325)
Key
Screw
Washer
Double-Row Bearing
Washer
Retaining Ring
Drive Spindle
6'' Velcro Pad (For 325)
6'' PSA Pad (For 325P)
Wrench (24mm)
1
1
1
1
1
1
1
1
1
1
1
1