background image

www.jettools.com   

 

Troubleshooting JAT-420 Mini Die Grinders

 

Any disassembly of the tool should be done by qualified service personnel. For problems not addressed 
below, contact JET technical service at 800-274-6846. 

Problem 

Possible cause 

Remedy 

Tool will not start. 

Air valve closed or obstructed. 

Open valve; clear any obstructions. 

Dirt or gum deposits on 
components. 

Flush tool with gum solvent. 
If problem persists, disassemble, 
clean and lubricate internal parts. 

Rotor vanes or other components 
are worn. 

Replace worn components. 
(Replace vanes as an entire set.) 

Throttle lever malfunction. 

Clean throttle lever mechanism to 
ensure free movement. Replace 
mechanism if needed. 

Bearing(s) worn. 

Disassemble and inspect bearing. 
Grease or replace as needed. 

Starts immediately as soon 
as air is connected without 
lever being pressed. 

Throttle valve malfunction. 

Inspect and repair throttle valve. 

Excessive or abnormal 
vibration. 

Improper lubrication. 

Lubricate properly according 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. 
Check compressor regulator 
setting; set air pressure to 90 psi.   
Check for loose connections at air 
inlet, o-rings, etc.  

Moisture or obstruction in air 
hose. 

Air supply must be clean and dry. 
Clean out air hose(s) and remove 
any kinks or bends. 

Improper size of air transmission 
lines, hoses, fittings, or 
couplings. 

Use appropriate-sized air 
lines/hoses. 
Verify proper fittings/couplings. 

Dirt or gum deposits on 
components. 

Flush tool with gum solvent. 
Check and clean air filter on 
compressor.  
Clean external areas of tool. If 
problem persists, disassemble, 
clean and lubricate internal parts. 

Rotor vanes are worn. 

Replace vanes (entire set). 

Severe air leakage. 
(Note: Minimal escape of 
air is often normal for air 
tools.) 

Air valve obstructed or damaged. 

Clean or replace. 

Housing loose or damaged. 

Tighten or replace as needed. 

Excessive heat develops 
in tool. 

Improper lubrication. 

Lubricate properly according to 
instructions in this manual. 

Содержание JAT-420

Страница 1: ...eumatic Mini Die Grinders 505420 JAT 420 Combo Pack Operation Maintenance Manual M 505420 Edition 2 11 2018 JET 427 New Sanford Road LaVergne TN 37086 Ph 800 274 6848 www jettools com Copyright 2018 J...

Страница 2: ...hile tired or under the influence of drugs alcohol or any medication 12 Adopt a comfortable posture with proper balance and maintain secure footing at all times Non slip footwear or anti skid floor st...

Страница 3: ...rely inserted into collet and collet nut is tight 36 Make sure workpiece is secure and will not shift while operating die grinder Do not hold workpieces with your hand 37 Use only attachments designed...

Страница 4: ...anual may not encompass all possible workplace environments The operator is expected to take appropriate precautions and exercise common sense As with any tool operation safety of operator and bystand...

Страница 5: ...e Inline Overall Length 4 92 in 125 mm 4 92 in 125 mm Housing material Aluminum Aluminum Net weight 0 7 lb 0 32 kg 1 lb 0 45 kg Shipping weight 1 95 lbs 0 88 kg 1 The specified values are emission lev...

Страница 6: ...o fail Instead add a leader hose and install any quick change couplings farther down the line 5 Adjust speed by turning regulator screw beneath housing with a flat blade screwdriver 6 Grip tool with b...

Страница 7: ...air wrench is too small or the air compressor CFM is not powerful enough for the job Continued use in either capacity will cause damage to the tool Tool Pressure JET Air Tools operate on 70 to 100 psi...

Страница 8: ...8 505420 JAT 420 Mini Die Grinder Combo Pack Figure 2 Recommended arrangement of air piping and air line system...

Страница 9: ...ate properly according 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 prop...

Страница 10: ...products For complete up to date product information check with your local distributor or visit the JET website How State Law Applies This warranty gives you specific legal rights subject to applicabl...

Страница 11: ...JET 11...

Страница 12: ...12 505420 JAT 420 Mini Die Grinder Combo Pack 427 New Sanford Road LaVergne Tennessee 37086 Phone 800 274 6848 www jettools com...

Отзывы: