10.3.6 Checking the drive belts
The life of the drive belts is influenced by belt tension.
■
Slack belts can slip and become damaged.
■ Over-tight belts stretch and wear quicker. Over-tight belts also place unnecessary stress on
bearings and shorten their life.
Material V-belt tension measuring device
Spares
Precondition The machine is shut down.
The machine is fully vented, the pressure gauge reads 0 psig.
Machine cooled down.
All compressed air consumers are disconnected and the air outlet valves are open.
The negative cable to the battery is disconnected.
Beware of rotating pulleys and moving belts.
There is danger of serious injury from pinching.
➤ Never check the drive belts unless the engine is at standstill.
➤ Never run the machine without a belt guard.
➤ Heed the safety instructions in chapter 3.5.
10.3.6.1 Visual check
1. Remove the belt guard.
2. Check the belts thoroughly for cracks, fraying or stretching.
Replace damaged belts.
3. Replace the belt guard.
4. Reconnect the negative battery terminal.
10.3.6.2 Checking belt tension
Check belt tension when they are warm, not hot, to avoid length variations through temperature.
The engine manufacturer recommends a tension measuring device for belts. For operation see the
engine service manual.
The belt tension may also be checked by hand if no tension measuring device is available.
10 Maintenance
10.3 Engine
84
SERVICE MANUAL Screw Compressor
M26 No.: 9_9446 01 USE
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