GTG25 F120-13 EN Troubleshooting
© Atlas Copco Industrial Technique AB - 9839 0065 01
23
Troubleshooting
Troubleshooting
The table below shows the most common troubleshooting procedures. Note that some actions 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 acti-
vated
*
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 sup-
ply 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 *
* This service must only be carried out by authorized workshop or qualified service technician.
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