Northern Industrial Tools Grinder 157791 User Manual

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  
Page: 1 of 6  
 
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.  
Page: 3 of 6  
 
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.  
Page: 4 of 6  
 
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  
Page: 5 of 6  
 
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  
Page: 6 of 6  
 

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