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TRANSMISSION HYDRAULIC SYSTEM:
A pump in the transmission provides hydraulic power for operating the clutches and the
parking brake and provides flow for the torque converter and for lubrication. The hydraulic
schematic is shown below.
There is a pressure intensifier on the right-hand frame rail near the transmission. This
device multiplies the transmission pump pressure by five times and supplies the higher
pressure to the parking brake release cylinder. Whenever the engine is running, this
pressure is available through a solenoid valve to release the brake. If the engine stops or
there is an electric or hydraulic malfunction that stops the pressure, a spring will apply the
parking brake.
Another solenoid valve connected to the transmission pump operates the shift cylinder for
two-wheel drive. If pressure is lost at this control due to electric or hydraulic malfunctions,
a spring will shift the cylinder to four-wheel drive.
There is a small reservoir located at the front of the engine compartment that supplies oil to
the pressure intensifier. This should be checked weekly and maintained at the full mark
with the same hydraulic oil used in the transmission.
Courtesy of Crane.Market
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