Jet JAT-650 Operations & Parts Manual page 10

Troubleshooting JAT-650/651 Screwdriver
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
Tool will not start.
Excessive or abnormal
vibration.
Loss of power; erratic
action.
Housing becomes hot
during operation.
Severe air leakage.
(Note: Minimal escape of
air is often normal for air
tools.)
10 JAT-650,651 Screwdrivers
Possible cause
Air valve closed or obstructed.
Dirt or gum deposits on
components.
Rotor vanes or other components
are worn.
Trigger inoperable.
Bearing(s) worn.
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.
Insufficient lubrication.
Worn components.
Air valve obstructed or damaged.
Housing loose or damaged.
Remedy
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 trigger mechanism to ensure
free movement. Replace
mechanism if needed.
Disassemble and inspect bearing.
Grease or replace as needed.
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.
Set regulator dial on tool to
maximum setting.
Check for loose connections.
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).
Lubricate with air tool oil.
Replace components as needed.
Clean or replace.
Tighten or replace as needed.