electronics of the ISM engine control an 87a relay located in the rear run box
marked Hyd. Fans. When intake manifold operating temperatures are normal,
the electronic engine energizes the coil of the relay. This energizes the coil of
the override valve and the hydraulic fluid signal flows through the override
valve to the thermovalve. If the ISM engine detects an over temperature con-
dition of the intake manifold, the coil of the 87a relay is deactivated. Power
to the override valve is removed, hydraulic fluid flow signal is stopped and
internal spool of the switching valve moves to full open position. The high
pressure fluid is directed to fan motors cooling the radiator.
The fan motors are driven by hydraulic fluid pressure from the switching
valve. The fan motors work on the same mechanical principal as a hydraulic
pump, only the mechanical principal when applied to the fan motors is
reversed. Instead of creating hydraulic pressure by meshing gears together in
a close tolerance housing, the fan motors receive hydraulic pressure. The
hydraulic fluid drives the fan motor’s internal gear assembly, spinning the
fan motors and the attached fan blades. The switching valve is mounted to
one fan motor. The fluid is directed to the input of that motor first. The out-
put of the first motor is hooked to the input of the second motor. The
hydraulic fluid is then cooled and filtered before returning to the reservoir.
The hydraulic reservoir is located in the engine com-
partment. It is made from aluminum so the tank will not be
affected by any moisture which may condense. The oil
level in the reservoir should be checked when the hydraulic
fluid is at operating temperature. This should be done
every 6000 miles or three months. The oil dipstick/oil fill
is located on top of the reservoir. The oil level should be
kept between the full and add marks on the dipstick. When
performing fluid level checks, inspect fittings and hoses for
signs of leakage. Look underneath the motorhome for any
signs of fluid leakage. Avoid untimely and costly failures
by having leaks repaired. Change the hydraulic oil filter
every 15,500 miles or once a year. Total system capacity is
approximately 46 quarts.
Chassis Information
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S I G N A T U R E
1 0 • 3 0 3
Fan Motor
Hydraulic Reservoir
Hydraulic Fluid Reservoir.
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