JET
9
Troubleshooting JAT-128 Impact Wrench
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.)
Trigger inoperable.
Clean trigger mechanism to ensure
free movement. Replace
mechanism if needed.
Bearing(s) worn.
Disassemble and inspect bearing.
Grease or replace as needed.
Excessive or abnormal
vibration.
Bearing(s) worn.
Disassemble and inspect bearing.
Grease or replace as needed.
Abnormal sound.
Loose fasteners.
Check tightness of housing and
external fasteners.
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.
Set regulator dial on tool to
maximum setting.
Check for loose connections.
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).
Impacts sufficiently, but
will not remove fastener.
Worn socket.
Use good condition sockets.
Worn impact mechanism.
Replace components.
Will not impact.
Damaged impact mechanism. Replace
mechanism.
Housing becomes hot
during operation.
Insufficient lubrication.
Lubricate with air tool oil.
Worn components.
Replace components as needed.
