1/4" Air Die Grinder
USER’S MANUAL
WARNING: Read carefully and understand all ASSEMBLY AND OPERATION
INSTRUCTIONS before operating. Failure to follow the safety rules and other basic safety
precautions may result in serious personal injury.
ITEM# 157791
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WORK AREA / PERSONAL SAFETY / TOOL CARE
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.
3. Keep bystanders, pets and 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 non-conductive clothes and non-skid footwear are
recommended when working. Wear restrictive hair covering to contain long hair. Always
wear steel toe shoes when operating the Air Die Grinder.
7. Use eye and ear protection. Always wear ANSI-approved impact safety goggles and ear
protection.
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 handle
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. Avoid unintentional starting. Be sure the trigger is not depressed when carrying the Air
Die Grinder.
12. Stay alert. Watch what you are doing, use common sense. Do not operate any tool when
you are tired.
13. 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
Air Die Grinder if the trigger does not turn on and off properly.
14. Guard against electric shock. Prevent body contact with grounded surfaces such as
pipes, radiators, ranges, and refrigerator enclosures.
15. 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.
16. Use proper size and type extension cord. If an extension cord is required for the air
compressor, it must be of the proper size and type to supply the correct current to the tool
without heating up. Otherwise, the extension cord could melt and catch fire, or cause
electrical damage to the tool. Check your compressor’s manual for the appropriate size
cord.
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17. For your safety, maintenance should be performed regularly by a qualified
technician.
18. Use compressed air only — Never use combustible gases as a power source.
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.
Additional Safety Warnings
1. Repetitive motions or exposure to vibration may be harmful to your hands and arms.
2. When wearing gloves to operate the Air Die Grinder, make sure that the gloves do not
interfere with operating the trigger. Test your gloves with the trigger before attaching the
unit to an air source.
3. Never start the tool unless you have a firm grip with both hands and you are positioned at
your workpiece or area.
4. Before using the Air Die Grinder, know what is directly underneath the work area or
workpiece.
5. The Air Die Grinder can quickly penetrate material. If working directly on the ground, make
sure you are not directly above shallow cables, lines, or pipes.
6. Never point the tool or the air hose (not included) at anyone.
7. Keep your finger away from the trigger until you are ready to work.
Operation
Set Up
Fig. 1
1. You will need to prepare a 1/4" air connector (sold separately) to connect to the Air Inlet.
First, wrap the 1/4" air connector (not included) with pipe thread seal tape before
connecting to a Air Source Hose (not included).
2. Attach air hose to the Air Inlet on the Air Die Grinder. 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.
3. Set the air pressure on your compressor to 90 PSI. Do not exceed the recommended air
pressure of 90 PSI.
4. Check the air connection for leaks.
5. Turn off the compressor and disconnect the air source hose in preparation to load bits into
the Air Die Grinder.
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Diagram for the Air Die Grinder
Parts List for the Air Die Grinder
Part#
Description
Qty.
Part#
Description
Qty.
1
2
3
Housing
Valve Bushing
Trigger
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
20
21
22
23
24
25
26
27
28
29
30
31
32
End Plate
Pin
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
Rotor
4
5
Lever
Spring
Rotor Blade
Cylinder
6
7
Pin
O-Ring
Washer
Rotor Bush
Front Plate
Pin
8
9
Pin
O-Ring
10
11
12
13
14
15
16
17
18
O-Ring
Air Valve
Spring
Bearing
Collet Holder
Retainer
Air Regulator
O-Ring
Housing Cap
1/4" Collet
1/8" Collet
Collet Cap
Wrench (14mm)
33
O-Ring
Valve Plug
Muffle Cover
Air Inlet
34
35
36
Wrench (19mm)
Rubber
19
Bearing
1
37
1
Wrapper
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WARNING
Some dust created by power sanding, sawing, grinding, drilling, and other construction activities
contains 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 and other masonry products, and
• 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 filter out microscopic particles.
Northern Tool + Equipment Co.,
2800 Southcross Drive West
P.O. Box 1499 Burnsville, MN 5337-0499
Made in China
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