MIRKA MR-312TH, Руководство по эксплуатации, Страница: 8 / 108

7
Symptom Possible Cause Solution
Low Power and/or Low Free
Speed
Insufficient Air Pressure 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).
Clogged Muffler(s) See the “Housing Disassembly” section for Muffler
removal. The Muffler can be back flushed with a
clean, suitable cleaning solution until all contami-
nates and obstructions have been removed. If the
Muffler can not be properly cleaned then replace it.
Replace Muffler Insert (See the
“Housing Assembly” Section).
Plugged Inlet Screen Clean the Inlet Screen with a clean, suitable
cleaning solution. If Screen does not come clean
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. See “Motor Disas-
sembly” and “Motor Assembly”.
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 Lock Ring
engagement. Check for damaged O-Ring in Lock
Ring groove. Remove Motor Assembly and Re-In-
stall the Motor Assembly. See “Motor Disassembly”
and “Motor Assembly”.
Motor Parts Worn Overhaul Motor. Contact authorized Mirka Service
Center.
Worn or broken Spindle Bearings Replace the worn or broken Bearings. See “Shaft
Balancer and Spindle Disassembly” and “Spindle
Bearings, AirSHIELD™ and Shaft Balancer As-
sembly”.
Air leakage through the Speed
Control and/or Valve Stem.
Dirty, broken or bent Valve Spring, Valve
or Valve Seat.
Disassemble, inspect and replace wore or dam-
aged parts. See Steps 14 and 15 in “Housing
Disassembly” and Step 13 in “Housing Assembly”.
Vibration/Rough Operation
Incorrect Pad Only use Pad Sizes and Weights designed for the
machine.
Addition of interface pad or other material Only use abrasive and/or interface designed for the
machine. Do not attach anything to the Polishers
Pad face that was not specifically designed to be
used with the Pad and Polisher.
Improper lubrication or buildup of foreign
debris.
Disassemble the Polisher and clean in a suitable
cleaning solution. Assemble the Polisher. (See
“Service Manual”)
Worn or broken Rear or Front Motor
Bearing(s)
Replace the worn or broken Bearings. See “Motor
Disassembly” and “Motor Assembly”.
Troubleshooting Guide
Note: All Sections referred to under “Solution” are located at the end of the manual in “Service Instructions”