TM 5-2420-230-10
If cab windows are not effectively being defrosted, move
auxiliary defroster fan switch to highest setting. When the
windows have been defrosted, the auxiliary defroster fan
speed can be reduced to a lower setting to maintain clear
vision through the cab glass.
e. Cab Pressurization.
It is possible to provide a positive air pressure in the cab
to minimize dust invasion while operating in dusty
conditions. This is achieved by closing the cab windows
and switching the cab pressurization switch to ON.
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