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Symptom
Low power and/or low free
speed.
Air leakage through the Air
Regulator and/or Valve Stem.
Vibration/rough operation.
AOS130NV
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 O-Ring.
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 tool while
the tool is running at free speed. It must be 6.2 bar
(90 psig/620 kPa).
The Muffler can be back-flushed with a clean, suit-
able cleaning solution until all contaminates and
obstructions have been removed. If the Muffler can
not be properly cleaned then replace it. Replace
Muffler Insert.
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.
Check for proper Motor alignment and O-Ring
engagement. Check for damaged O-Ring in Front
End Plate. Remove Motor Assembly and re-install
the Motor Assembly.
Overhaul Motor. Contact authorized Mirka Service
Center.
Replace the worn or broken Bearings.
Disassemble, inspect and replace worn or dam-
aged parts.
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 Tool's
Pad face that was not specifically designed to be
used with the Pad and Tool.
Disassemble the Tool and clean in a suitable
cleaning solution. Reassemble the Tool.
Replace the worn or broken Bearings.
31
Solution
Rev 01/05/17
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