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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 2548
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).
For central vacuum machines it is possible
to have too much vacuum while sanding
on a flat surface causing the pad to stick
to the sanding surface.
Solution
Check air line pressure at the inlet of the Sander
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. Replace item 48, Muffler Insert (see the
"Housing Assembly" section).
Clean the Inlet Screen with a clean, suitable clean-
ing solution. IIf 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
re-install the Motor Assembly. See "Motor Disas-
sembly" 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 abrasive and/or interface designed for
the machine. Do not attach anything to the Sander
Pad face that was not specifically designed to be
used with the Pad and Sander.
Disassemble the Sander and clean in a suitable
cleaning solution. Assemble the Sander. (See
"Service Manual").
Replace the worn or broken Bearings. See "Motor
Disassembly" and "Motor Assembly".
For CV machines reduce vacuum through the
vacuum system.
31
REV 11/16/15
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