■ Fuel prefilter
■ Fuel micro-filter
Ensure that no foreign particles can enter the filter housings!
Do not wipe out the filter housings.
Water must be prevented from entering.
Fig. 51 Maintain the engine fuel filter
A
Fuel prefilter
B
Fuel micro-filter
1
Screw cap
2
Filter element
3
Sealing ring
4
Filter housing
➤ Open both left-hand doors.
Fuel pre-filter maintenance:
See Fig. 51; Detail: A.
1. Place a receptacle beneath the fuel pre-filter housing.
2. Use a wrench to loosen the screw cap of the fuel pre-filter.
3. Pull the screw cap with filter element somewhat out off the filter casing. Drain any fuel in the
filter housing.
4. Remove the screw cap with filter element.
5. Remove the filter insert from the screw top
6. Clean the screw cap and filter element.
7. Check the sealing ring and filter element for wear.
When clearly worn: replace components.
8. Moisten the sealing ring with some fuel.
9. Insert the clean filter element into the screw cap.
10. Screw the screw cap with filter element and tighten to 25 Nm.
10 Maintenance
10.4 Engine maintenance
126
Operator Manual Screw Compressor
M250 SIGMA CONTROL MOBIL
No.: 9_9570 07 USE