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Symptom
Low power and/or low free
speed.
Air leakage through the Speed
Control and/or Valve Stem.
Vibration/rough operation.
Note: All sections referred to under "Solution" are located at the end of the manual in "Service Instructions"
DOC A2301
Troubleshooting Guide
Possible Cause
Insufficient air pressure.
Clogged Muffler)s(.
Plugged Inlet Screen.
One or more worn or broken Vanes.
Internal air leakage in the Motor Housing
indicated by higher than normal air con-
sumption and lower than normal speed.
Motor parts worn.
Worn or broken Spindle Bearings.
Dirty, broken or bent Valve Spring, Valve
or Valve Seat.
Incorrect Pad
Addition of interface pad or other material.
Improper lubrication or buildup of foreign
debris.
Worn or broken rear or front Motor
Bearing(s).
Check air line pressure at the inlet of the Polisher
while the tool is running at free speed. It must be
6.2 Bar (90 psig/620 kPa).
See the "Housing Disassembly" section for Muffler
removal. The item 51 Muffler can be back-flushed
with a clean, suitable cleaning solution until all con-
taminants and obstructions have been removed.
If the Muffler cannot be properly cleaned then
replace it. )See the "Housing Assembly" Section(.
Clean the Inlet Screen with a clean, suitable
cleaning solution. If the Screen cannot be cleaned,
replace it.
Install a complete set of new Vanes (all vanes must
be replaced for proper operation). Coat all vanes
with quality pneumatic tool oil. See "Motor Disas-
sembly" and "Motor Assembly".
Check for proper Motor alignment and Lock Ring
engagement. Check for damaged O-Ring in Lock
Ring groove. Remove Motor Assembly and rein-
stall the Motor Assembly. See "Motor Disassembly"
and "Motor Assembly".
Overhaul Motor. Contact authorized Mirka Service
Center.
Replace the worn or broken Bearings. See "Shaft
Balancer and Spindle Disassembly" and "Spindle
Bearings, AirSHIELD™ and Shaft Balancer As-
sembly".
Disassemble, inspect and replace worn or dam-
aged parts. See steps 2 and 3 in "Housing Disas-
sembly" and steps 2 and 3 in "Housing Assembly".
Only use Pad sizes and weights designed for the
machine.
Only use abrasives and/or interfaces designed for
the machine. Do not attach anything to the Polisher
Pad face that was not specifically designed to be
used with the Pad and Polisher.
Disassemble the Polisher and clean in a suitable
cleaning solution. Reassemble the Polisher. (See
"Service Manual".(
Replace the worn or broken Bearings. See "Motor
Disassembly" and "Motor Assembly".
31
Solution
Rev 02/26/16
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