4 DISPLAY AND CONTROL ELEMENTS
4.72 MHL380 D
4.11.7.1 Operating principle of the filter
system
When air enters the filter system, the pre-
screener (110/1) removes large dust particles
directly. In circuits, other coarse dust accumu-
lates around the subsequent casing cyclone
filter (110/3) and can be discharged using the
squeeze valve (110/4). The blower in the
housing (110/5) draws the air through the cas-
ing cyclone filter and pushes it through the
exhaust particle filter (also in the housing).
Depending on the site of operation, the ex-
haust particle filter may also contain charcoal.
The cleaned air flows through the rear wall of
the cab (110/6) in the heating and air condi-
tioning system.
j
Danger of poisoning
• Wear personal safety gear when
performing maintenance work.
• The filter may only be changed by
specialists trained by the filter
manufacturer.
• Do not clean the casing cyclone
filter and exhaust particle filter.
Dispose of them as contaminated
material.
In an emergency: Seek treatment
from a doctor
Thanks to the blower and quality of the cab's
seal integrity, a positive pressure of approx.
150 to 250 Pa builds up, which prevents
harmful substances from entering the cab. To
achieve the required positive pressure, the
windows and cab door must be closed com-
pletely.
The control on the monitoring and control unit
(111/1) monitors the positive pressure and
filter status.
If the cab pressure sinks below the limit value
of 100 Pa, the acoustic warning buzzer
sounds, the color of the LED (110/1) changes
to red and the green signal lamp (110/2) goes
out.
h Manufacturer's operating instructions
Fig. 110 Filter system
Fig. 111 Monitoring and control unit
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