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Fig. 64 Changing/tensioning the drive belt
1
Drive belt
2
Jockey wheel
3
Locking pin
4
Ratchet
Tensioning the drive belt:
1. Insert the ratchet square in the corresponding hole in the jockey wheel.
2. Using the ratchet, press the jockey wheel opposite the arrow direction. Ensure that the drive belt
is correctly positioned in its guide.
3. Check the belt tension (see Fig. 63).
Belt tension too low: Using the ratchet, further press the jockey wheel opposite the arrow direction.
Belt tension too high: Using the ratchet, slightly press the jockey wheel in arrow direction.
Changing the drive belt:
1. Insert the ratchet square in the corresponding hole in the jockey wheel.
2. Using the ratchet, press the jockey wheel in arrow direction until the locking pin can be fastened
in the mounting hole.
3. Insert locking pin in mounting hole.
The drive belt is free of tension.
4. Pull the drive belt first off the smallest or the jockey wheel.
5. Check the pulleys for dirt and wear.
Dirty pulley: Clean pulley.
Worn pulley: Have the pulley changed.
6. Manually route the new drive belt over the pulleys without using force.
7. Hold up the jockey wheel with the ratchet and remove the locking pin.
The jockey wheel is pushed upwards by spring tension and pre-tensions the drive belt.
8. Tension the drive belt. Ensure that the drive belt is correctly positioned in its guide.
A belt that has been replaced may not be used again.
Check the belt tension after running for approximately 15 minutes.
Old belts should be disposed of in accordance with the latest environmental regulations.
10 Maintenance
10.4 Engine
No.: 9_9425 01 E
Service Manual Screw Compressor
M170 SIGMA CONTROL MOBIL
121