General Maintenance
147
Model MMV Rev. 10/11
The closed cab has two air filters. These filters require periodic
maintenance.
Recirculation Air Filter
Periodically remove and inspect the recirculation air filter (1) located directly
behind the seat. Remove the two thumb screws (2) holding the vent cover
and filter (1) to the heater assembly housing (3). Gently hand wash with
water. A mild detergent may also be used if the filter is saturated with dirt.
Fresh Air Intake Filter
The fresh air intake filter (4) cleans outside air when pressurizing the cab.
Check the condition of the filter by removing the recirculation filter to gain
access to the fresh air filter. Pull the fresh air filter out of the pocket in the
heater assembly housing.
When operating in normal conditions, inspect the filter weekly. When
operating in extreme conditions, inspect the filter daily. Clean the filter by
removing the filter and shaking it. Be sure the filter is seated all the way into
the pocket in the heater assembly housing. Reassemble the recirculation
filter to the heater assembly housing.
The filter should be replaced at 250 hour intervals under normal operating
conditions and at 50 hour intervals under extreme operating conditions.
NOTE: Correctly position the filter so the air flow is directed into the cab.
3. Closed Cab Air Filters
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