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Trouble
Low power or low free speed
Excessive runout
Scoring of End Plate
MAINTENANCE SECTION
TROUBLESHOOTING GUIDE
Probable Cause
Insufficient air pressure
Clogged muffler elements
Plugged Inlet Screen
Worn or broken Vanes
Loose Clamp Nut or Arbor
Housing
Worn or broken Motor Housing
Internal air leakage in the Motor
Housing indicated by high air
consumption/low speed or air
leaking out the front and rear
exhaust simultaneously.
Grit buildup under the Throttle
Lever restricting full Throttle
Valve Plunger movement.
Bent stem on Throttle Valve
Front Seal Cup Assembly
dragging against the shield of
the Front Rotor Bearing
Bent rotor hub
Loose Collet Nut
Worn or damaged Collet or
Collet Nut
Worn or damaged Front Rotor
Bearing
Bent, worn or broken Extension
Arbor on HX or HXD models
Worn or damaged Front Arbor
Bearing on HX or HXD models
Worn Front End Plate Spacer or
Front End Plate
Worn Front Rotor Bearing
Solution
Check air line pressure at the Inlet of the Tool.
It must be 90 psig (6.2 bar/620 kPa).
Disassemble the Tool and agitate bare Motor
Housing and Flange in clean, suitable, cleaning
solution. If elements cannot be cleaned, replace
the Motor Housing and/or the Flange.
Clean the Inlet Screen in clean, suitable, cleaning
solution or replace the Screen.
Install a complete set of new Vanes.
Tighten the Nut or Housing to 20 to 25 ft–lb (27 to
34 Nm) torque.
Replace the Motor Housing.
Replace the Motor Housing.
Remove the Throttle Lever and clean the groove
in the Motor Housing.
Replace the Throttle Valve.
Reposition the Front Seal Cup Assembly.
Replace the Rotor.
Tighten the Collet Nut until snug.
Replace the damaged component and retest.
Replace the Front Rotor Bearing.
Replace the Extension Arbor if, when mounted
between centers, the runout on the arbor body
exceeds 0.002" T.I.R. or 0.0005" T.I.R. on the
bearing mounting diameters.
Replace the Front Arbor Bearing.
Install a new Front End Plate Spacer and Front
End Plate.
Install a new Front Rotor Bearing.
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