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PN49999–459
MAINTENANCE SECTION
TROUBLESHOOTING GUIDE
Trouble Probable Cause Solution
Rough operation Worn or broken Rear End Plate
Assembly or Front Rotor Bearing
Examine each bearing. Replace the Rear End Plate
Assembly if worn or damaged or replace the Front
Rotor Bearing.
Rear End Plate Assembly is a matched set. See
disassembly and assembly instructions.
Worn or broken Bevel Gear or
Pinion
Check for worn or broken teeth. If a replacement
is necessary, install both the Bevel Gear and
Pinion. They are a matched set and must not be
mismatched.
Bent Arbor Mount the Arbor on centers. Check bearing
diameter runout with an indicator. Replace the
Arbor if runout exceeds 0.002” (0.051 mm) Total
Indicator Reading.
Scoring Improper assembly Make certain that all motor parts are properly
aligned prior to installing the Handle Assembly
into the Arbor Housing.
Air leaks Worn Valve Seat or Valve Seat
Washer
Replace worn parts.
Worn Throttle Valve Seals Replace both Seals.
Oil Chamber Plug worn or not
tight
Tighten the Plug. If the problem persists, replace
the Plug.
High free speed Worn Rear End Plate Assembly
and/or Controller Seal
Replace the Rear End Plate Assembly if the large
inside diameter of the Rear End Plate is worn to
1.156” (38.506 mm) or larger.
Grinder will not run Coupling Nut too tight Loosen Coupling Nut and retighten to 47.5 to
52.5 ft–lb (64.5 to 71.5 Nm) torque.
Do not exceed 52.5 ft–lb (71.5 Nm) torque.
SAVE THESE INSTRUCTIONS. DO NOT DESTROY.