# Troubleshooting the tool

The table below shows the most common troubleshooting procedures.

The actions marked with asterisk * must only be carried out by authorized workshops or qualified service technicians.

Problem | Reason | Action
--- | --- | ---
Tool does not start | No air flow to the tool | Check air connection
| Overspeed protection device activated | *
| Motor jammed | *
Inconsistent idling speed | Unstable air pressure | Check air pressure regulator
| Worn governor | *
Low power | Low air pressure | Check air pressure
| Wrong length or dimension of supply hose | Check air connection
| Blocked filters | Clean or change the corse & fine filter
| Too humid air (high dew point) | Check the compressor
| Too much oil in gear box | Check oil level
| Worn throttle valve | *
| Worn turbine | *
| Worn governor | *
Oil in exhaust air | Lubricated air | Oil in the air is not recommended
| Leak from turbine seal | *
| Leak from O-ring on diffuser | *
| Leak from overspeed pin | *
Oil leakage at spindle | Loose screws or oil plug | Tighten screws
| Worn oil seal | *
| Damaged O-ring on plate | *
| Damaged spindle bearing | *
| Missing seal on oil plug or screws | Replace seal
Tool starts unexpectedly | Damaged throttle valve | *
| Valve pin jammed in start position | Change pin & guide
| Damaged safety lock mechanism | Change mechanism
Vibrations | Worn or damage grinding wheel | Change wheel
| Autobalancer not working properly | Change autobalancer
Too high idle speed | Governor | *
Motor housing too hot | Too much oil in gear box | Check oil level
Abnormal sound | Too little oil in gear housing | Check oil
| Damaged gear | *
| Incorrect gear play | *
| Worn motor bearings | *