9
Symptom
Possible Cause
Solution
Troubleshooting guide
Low power and/
or low free speed.
Turn the speed control to desired speed.
Speed control set to low speed.
Check air supply (according to operating instructions).
Low air pressure.
Clean or replace the muffler.
Clogged muffler.
Clean or replace the screen.
Plugged air inlet screen.
Check motor assembly and alignment.
Check air inlet o-ring alignment on motor assembly.
Internal air leakage in the motor
housing.
Air leakage at the
speed control.
Vibration/rough
operation.
Install a complete set of new vanes and rotor
(Code: MPP9006).
Worn or broken vanes.
Contact Mirka authorized service center.
Housing cracked or damaged.
Replace the worn or broken bearing (Code: MPP9001).
Worn or broken spindle bearing.
Disassemble, inspect and replace worn or damaged
parts.
Dirty, broken or bent valve spring,
valve or valve seat.
Remove air inlet connection and reassemble the air valve
(207), with the valve stem (202) in its upper position.
Incorrect assembly of air valve.
Only use Mirka backing pad (125 mm (5")
Code: 8292502011, 150 mm (6") Code: 8292605011).
Incorrect backing pad.
Only use abrasive and/or interface designed for the
machine.
Addition of interface or other
material.
Replace the pad. Only use Mirka backing pad
(125 mm (5") Code: 8292502011, 150 mm (6")
Code: 8292605011).
Damaged backing pad.
Replace the worn or broken bearings.
Worn or broken motor bearing(s).
Lower the vacuum of your dust extraction unit.
Too much vacuum on a flat surface
can increase vibrations.
Increase motor speed with flow regulator, max 6.2 bar.
Low motor speed.
