Section 10 --- Chassis Information
The Executive 2005
506
Fan Motor
The fan motors are driven by hydraulic fluid pressure from the switching valve. Fan motors work
on the same mechanical principle as a hydraulic pump, only in reverse. Instead of creating hydraulic
pressure by meshing gears together in a close tolerance housing, the fan motor(s) receive hydraulic pres-
sure. The hydraulic fluid drives the fan motor's internal gear assembly, spinning the fan motor and
attached fan blades.
The switching valve is mounted to one fan motor. Fluid is directed to the input of that motor first.
The output of the first motor is hooked to the input of the second motor (ISM only). The hydraulic fluid
is then cooled and filtered before returning to the reservoir.
NOTE:
Detroit Series 60 and Cummins ISX engines use one fan motor, ISM engines use
two.
Hydraulic Filter
The hydraulic system filter, located in the engine compartment, has special features to protect
the precision tolerance hydraulic components. The filter head assembly has a built in sight gauge that
indicates fluid flow through the filter. A specially designed media filter absorbs harmful contaminants
such as moisture and dirt. When the engine is running, use the sight gauge to check the filtering
process.
090393
Change the filter if the indicator is in
the red zone with the engine running.
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