10.4.8.2 Checking belt tension
Check belt tensions only when they are warm, not hot, to avoid length differences due to temperature
differences.
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.
Fig. 63 Manual checking of the belt tension
A
Permissible intrusion depth of the belt
*
Approximate pressure exerted: 10 kg
Permissible movement: 10 – 15 mm
Checking belt tension with tension measuring de‐
vice.
Belt tension checking by hand
1. Check belt tension with the tension measur‐
ing device.
2. Increase the tension on a loose belt.
Press the belts in with the thumb at the mid-point
between pulleys.
1. Check belt tension by hand (see Fig. 63).
2. Increase the tension on a loose belt.
Putting in operation:
1. Replace the belt guard.
2. Activate the «battery isolating switch».
3. Close the doors.
10.4.8.3 Changing/tensioning the drive belt
The drive belt is pre-tensioned by the spring force in the jockey wheel. By turning the jockey wheel
you can adjust the belt tension.
10 Maintenance
10.4 Engine
120
Service Manual Screw Compressor
M170 SIGMA CONTROL MOBIL
No.: 9_9425 01 E
