24
MAINTENANCE SECTION
TROUBLESHOOTING GUIDE
Trouble
Probable Cause
Solution
Leaky Throttle Valve
Dirt accumulation on Throttle
Valve or Valve Seat
Disassemble, inspect and clean parts.
Worn Throttle Valve or Valve Seat Replace the Throttle Valve and/or Throttle Valve
Seat.
Exhausts at wrong location
Incorrect orientation of the Flow
Ring
Reverse the face of the Flow Ring against the Motor
Housing.
Front Rotor Bearing runs hot
Incorrect installation of the Front
Seal Cup
Reposition the Front Seal Cup flush with the face of
the Front End Plate Spacer.
Front End Plate Spacer rubbing the
bore of the Front End Plate
Replace the Front End Plate and Front End Plate
Spacer combination.
Incorrect Front Rotor Bearing
installation orientation
If a black stain or black hashmarks are not visible on
the face of the Bearing when it is assembled with the
End Plate and Rotor, the Bearing is backwards.
If possible, remove the Bearing and install it correctly
or replace the Bearing.
Slow tool idle
Bent or leaky Throttle Valve
Replace the Throttle Valve.
Air leakage around Flow Ring
Damaged, mutilated or missing
Flange Clamp
Replace the Flange Clamp.
Damaged Flow Ring
Replace the Flow Ring
Rough operation/vibration
Improper lubrication or dirt build-
up
Disassemble the tool and clean in a clean, suitable,
cleaning solution. Assemble the tool and inject 3 cc
of the recommended oil into the Inlet and run the
Sander long enough to coat the internal parts with the
oil.
Worn or broken Rear Rotor
Bearing or Front Rotor Bearing
Replace the worn or broken Bearings. Examine the
Front End Plate, Front End Plate Spacer, Front Seal
Cup and Rear Rotor Bearing Spacers and replace any
damaged parts. If the rear end plate is damaged,
replace the Rotor.
Worn or broken Upper Arbor
Bearing or Lower Arbor Bearing
Replace the worn or broken Bearing.
Worn or broken Bevel Gear or
Bevel Pinion
Examine the Bevel Gear and Bevel Pinion. If either
is worn or damaged, replace both the Gear and Pinion
because they are a matched set and must not be used
separately.
SAVE THESE INSTRUCTIONS. DO NOT DESTROY.
