Fig. 71 Drive belt maintenance
3
Swing frame adjuster (belt tensioner)
4
Tensioning frame (belt tension lever)
8
Drive belt
➤ Open all doors.
10.7.1 Carry out visual check
1. Check the belt thoroughly for cracks, fraying or stretching.
When damaged or worn: Replace the drive belt immediately.
2. Turn on the «battery isolating switch».
3. Close the doors.
10.7.2 Checking belt tension
The drive belts are automatically tensioned over a certain range by a compression spring in the
tensioning device.
If the drive belts have expanded to the point that the distance between the bottom edge of
the swing frame tensioner
3a
and the washer
3b
is less than the reference dimension, it be‐
comes necessary to re-tighten the belt.
(see illustration 72 for details)
■ Reference and setting dimension
A
= 197 mil
1. Determine the distance between the lower edge of the swing frame tensioner
3a
and the
washer
3b
.
Distance insufficient: Tension the drive belt.
2. Close the doors.
10 Maintenance
10.7 Drive belt maintenance
No.: 9_9570 07 USE
Operator Manual Screw Compressor
M250 SIGMA CONTROL MOBIL
159