Fig. 25 Engine air filter maintenance
1 Filter housing
2 Air filter element
3 Filter cap
4 Spring retaining flap
5 Dust evacuating valve
6 Maintenance indicator
7 Reset knob for the maintenance indicator
8 Red zone indicator scale
9 Indicating piston of the maintenance indi‐
cator
10 Valve part
11 Drain slit
Checking contamination of the air filter:
Air filter maintenance is necessary when the yellow piston inside the maintenance indicator 6 rea‐
ches the red zone.
➤
Check the air filter maintenance indicator.
If the yellow piston reaches the red zone, clean or replace the filter insert 2
.
Cleaning the air filter:
The dust evacuator valve 5 must be at the bottom. The dust evacuation valve is on the filter
cap 3 .
1.
Press both spring retaining flaps 4
together and remove the filter cap 3 .
2.
Withdraw the filter element 2
.
3.
Clean the filter housing 1
, filter cap 3 and sealing surfaces.
4.
To empty the dust evacuator valve 5
:
■
Pinch the valve part 10
above the drain slit 11 (drain slit opens).
■
Remove any dust clumps.
■ Clean the slit.
10 Maintenance
10.3 Engine
76
Service Manual Screw Compressor
M43 No.: 9_9432 02 E
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