JET Tools JAT-402 User Manual - Page 10

Troubleshooting JAT-401/402 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. Starts immediately as soon as air is connected without lever being pressed. Excessive or abnormal vibration. Loss of power; erratic action. Severe air leakage. (Note: Minimal escape of air is often normal for air tools.) Excessive heat develops in tool. Air valve closed or obstructed. Dirt or gum deposits on components. Rotor vanes or other components are worn. Throttle lever malfunction. Bearing(s) worn. Throttle valve malfunction. Improper lubrication. Bearings worn. Low air pressure. Moisture or obstruction in air hose. Improper size of air transmission lines, hoses, fittings, or couplings. Dirt or gum deposits on components. Rotor vanes are worn. Air valve obstructed or damaged. Housing loose or damaged. Improper lubrication. Open valve; clear any obstructions. Flush tool with gum solvent. If problem persists, disassemble, clean and lubricate internal parts. Replace worn components. (Replace vanes as an entire set.) Clean throttle lever mechanism to ensure free movement. Replace mechanism if needed. Disassemble and inspect bearing. Grease or replace as needed. Inspect and repair throttle valve. Lubricate properly according to instructions in this manual. Disassemble and inspect bearing. Grease or replace as needed. 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. Air supply must be clean and dry. Clean out air hose(s) and remove any kinks or bends. Use appropriate-sized air lines/hoses. Verify proper fittings/couplings. 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. Replace vanes (entire set). Clean or replace. Tighten or replace as needed. Lubricate properly according to instructions in this manual. 10 JAT-401,402 Die Grinders