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Mirka® PROS • 150 mm (6") • 125 mm (5")
Mirka® PROS • 150 mm (6") • 125 mm (5")
55
en
Troubleshooting guide
Symptom
Possible cause
Solution
Low power and/ or low free speed.
Speed control set to low speed .
Turn the speed control to desired speed .
Low air pressure .
Check air supply (according to operating
instructions) .
Clogged muffler .
Clean or replace the muffler .
Plugged air inlet screen .
Clean or replace the screen .
Internal air leakage in the motor housing .
Check motor assembly and alignment .
Check air inlet O-ring alignment on motor
assembly .
Worn or broken vanes .
Install a complete set of new vanes and
rotor (Kit F) .
Housing cracked or damaged .
Contact Mirka authorized service centre .
Worn or broken spindle bearing .
Replace the worn or broken bearing
(Kit A) .
Air leakage at the speed control.
Dirty, broken or bent valve spring, valve
or valve seat .
Disassemble, inspect and replace worn or
damaged parts .
Incorrect assembly of air valve .
Remove air inlet connection and
reassemble the air valve (207), with the
valve stem (202) in its upper position .
Vibration / rough operation.
Incorrect backing pad .
Only use Mirka backing pad 125 mm (5"),
150 mm (6") .
Addition of interface or other material .
Only use abrasive and/or interface
designed for the machine .
Damaged backing pad .
Replace the pad . Only use Mirka backing
pad 125 mm (5"), 150 mm (6") .
Worn or broken motor bearing(s) .
Replace the worn or broken bearings .
Too much vacuum on a flat surface can
increase vibrations .
Lower the vacuum of your dust extraction
unit .
Low motor speed .
Increase motor speed with flow regulator,
max 6 .2 bar .
