
31
Symptom
Possible Cause
Solution
Low power and/or low free
speed.
Insufficient air pressure.
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).
Clogged Muffler)s(.
The Muffler can be back-flushed with a clean, suit
-
able cleaning solution until all contaminants and
obstructions have been removed. If the Muffler can
not be properly cleaned then replace it. Replace
Muffler Insert.
Plugged Inlet Screen.
Clean the Inlet Screen with a clean, suitable
cleaning solution. If the Screen cannot be cleaned,
replace it.
One or more worn or broken vanes.
Install a complete set of new Vanes (all vanes must
be replaced for proper operation). Coat all vanes
with quality pneumatic tool oil.
Internal air leakage in the Motor Housing
indicated by higher than normal air con-
sumption and lower than normal speed.
Check for proper Motor alignment and Shield
engagement. Check for damaged O-Ring in Front
End Plate. Remove Motor Assembly and re-install
the Motor Assembly.
Motor parts worn.
Overhaul Motor. Contact authorized Mirka Service
Center.
Worn or broken Gear Bearings.
Replace the worn or broken Gears and/or Bear-
ings.
Air leakage through the Air
Regulator and/or Valve Stem.
Dirty, broken or bent Valve Spring, Valve
or O-Ring.
Disassemble, inspect and replace worn or dam-
aged parts.
Vibration/rough operation.
Incorrect Pad.
Only use Pad sizes and weights designed for the
machine.
Addition of interface pad or other material.
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.
Improper lubrication or buildup of foreign
debris.
Disassemble the Tool and clean in a suitable
cleaning solution. Reassemble the Tool.
Worn or broken Rear or Front Motor
Bearing(s).
Replace the worn or broken Bearings.
Troubleshooting Guide
AP
300NV
Rev
02/06/17
Содержание AP 300NV
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