Troubleshooting

The table below shows the most common troubleshooting procedures. Note that some actions must only be done by authorized workshops or qualified service technicians.

Problem	Reason	Action
Tool does not start	No air flow to the tool	Do a check of air connection and compressor
	Rotor in dead position	Disconnect air supply and then turn spindle quickly
	Air filter in tool air inlet blocked	Clean air filter carefully
Inconsistent idling speed	Unstable air pressure	Do a check of air pressure regulator
	Resonance from exhaust	Start tool rapidly and slowly until noise disappear
Low power	Low air pressure	Do a check of air pressure
	Too long length or too small inner diameter of air supply hoses and pipes	Do a check of air hoses and air pipes
	Too small inner diameter of air connections	Do a check of air connections
	Blocked air supply filters	Clean or replace filters
	Air filter in tool air inlet blocked	Clean air filter carefully
	Too humid air (high dew point)	Do a check of the compressor
	Worn throttle valve	*
	Worn vanes	*
Vanes wear fast	High friction in motor	Add oil into inlet air to increase life length of vanes
	Dirty air might wear vanes	Do a check of filters in tool air inlet and in air supply
Tool starts unexpectedly	Valve pin jammed in start position	Replace pin and bushing
	Damaged security mechanism	Replace lever
Vibrations	Worn or damaged grinding wheel	Replace wheel
	Damaged spindle	*
	Worn or damaged flange washers	Replace flange washers
Too high idle speed	Too high air pressure	Do a check of air pressure
Abnormal or high sound	Resonance from exhaust	Restart tool rapidly and slowly until noise disappear
	Exhaust hose is missing	Assemble exhaust hose
	Damaged gear	*
	Damaged spindle	*
	Worn bearings	*

* This service must only be done by authorized workshop or qualified service technician.