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JET   

 

Setup and Assembly 

Any missing parts or damage should be reported 
immediately to your JET

®

 distributor. Do not use a 

damaged tool. Read this instruction manual 
thoroughly for operation, maintenance and safety 
instructions. 

Box contents: 

1 Micro 

die 

grinder 

Open end wrenches 

1 Quick 

connect 

adaptor 

Operation and parts manual  

1 Warranty 

card 

 

Operation 

 

The die grinder must be 

properly lubricated before operation. See 
“Lubrication” section.

  

 

Figure 1 

1. 

An adaptor for a quick connect is provided. If 
desired, screw it onto the air inlet (Figure 1). 

2. 

If an in-line oiler is not being used, add 4 or 
5 drops of air tool oil (not included) into the 
air inlet. 

3. 

Rotate collet nut (Figure 1) until a wrench 
can be placed in the notch of collet holder. 
Keep wrench stationary on collet holder.  
Place second wrench over collet nut and turn 
to loosen collet.  

4.  Fully insert 1/8-in. shaft of grinding 

attachment (not included) into collet, and 
retighten collet nut securely with wrench. 

5.  Blow out air line to remove any dirt or 

moisture, then connect air supply hose to 
tool. Set air pressure to 90psi. 

6. 

Make sure grinder is off (air regulator turned 
all the way counterclockwise). Turn on air. 

7.  Hold die grinder firmly and rotate air 

regulator clockwise to turn on and adjust 
speed. 

8. 

Wait for grinder to reach operating speed, 
then gently move it into contact with 
workpiece. Do not force. 

9. 

When finished, turn air regulator to off. 

Maintenance 

Lubrication 

The die grinder should be lubricated 

daily

 (or 

before each use) with air tool oil through the air 
inlet. During continual operation, it should be re-
oiled every 1 to 2 hours. This can be done with an 
in-line oiler, or manually. If done manually, 
proceed as follows: 

1. 

Disconnect air hose from tool. 

2. 

Place 4 or 5 drops of air tool oil into air inlet. 

NOTE: Air tool oil not provided; it is available 
at most major hardware and tool stores. SAE 
#10 oil or sewing machine oil may be used 
as a substitute. Do not use detergent oil. 

3.  Re-connect air. Run die grinder at low 

throttle without load for a few seconds to 
distribute the oil throughout tool. 

4.  When finished operating die grinder, 

disconnect air hose. Wipe off housing with a 
dry cloth. Place 4 or 5 drops of air tool oil into 
air inlet; re-connect air and run tool for a few 
seconds to distribute the oil. Disconnect air. 

Storage  

Avoid storing the die grinder in very humid 
locations which promotes rusting of internal 
mechanisms. Always oil the tool and disconnect 
air hose before storage. 

 

Summary of Contents for JAT-400

Page 1: ...Pneumatic Micro Die Grinder 505400 JAT 400 Operation Parts Manual M 505400 Edition 1 02 2015 JET 427 New Sanford Road LaVergne TN 37086 Ph 800 274 6848 www jettools com Copyright 2015 JET...

Page 2: ...eeded JET has Authorized Service Centers located throughout the United States For the name of an Authorized Service Center in your area call 1 800 274 6846 or use the Service Center Locator on the JET...

Page 3: ...romium from chemically treated lumber Your risk of exposure 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 wi...

Page 4: ...proper accessories may be hazardous 31 Maintain tools with care Keep air tool clean and oiled for best and safest performance 32 Do not use combustible gases carbon dioxide oxygen or any bottled gas a...

Page 5: ...in this document The instructions and warnings in this manual may not encompass all possible workplace environments The operator is expected to take appropriate precautions and exercise common sense A...

Page 6: ...lief sleeve Overall Length 5 1 2 in 139 7 mm Housing material Aluminum Net weight 0 54 lb 0 24 kg Shipping weight 0 78 lb 0 35 kg 1 The specified values are emission levels and are not necessarily to...

Page 7: ...ll the way counterclockwise Turn on air 7 Hold die grinder firmly and rotate air regulator clockwise to turn on and adjust speed 8 Wait for grinder to reach operating speed then gently move it into co...

Page 8: ...e job Continued use in either capacity will cause damage to the tool Tool Pressure JET Air Tools operate on 70 to 100 psi pounds per square inch air pressure measured at the tool when the tool is oper...

Page 9: ...JET 9 Figure 2 Recommended arrangement of air piping and air line system...

Page 10: ...to instructions in this manual Bearings worn Disassemble and inspect bearing Grease or replace as needed Loss of power erratic action Low air pressure Verify compressor has proper CFM rating for tool...

Page 11: ...JAT400 13 Cylinder 1 14 JAT400 14 Rotor vane 3 15 JAT400 15 Rotor 1 Index Part No Description Qty 16 JAT400 16 Spacer 1 17 JAT400 17 Lateral disc 1 18 JAT400 18 Ball bearing 695T12ZZ 2 19 JAT400 19 I...

Page 12: ...00 274 6848 Monday through Friday 8 00 a m to 5 00 p m CST Please have the stock number and serial number of your tool available when you call so that we may serve you quickly and accurately 427 New S...

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