2-92 Published 08-25-09, Control # 077-04
HYDRAULIC SYSTEM RT9130E SERVICE MANUAL
PARK BRAKE CYLINDER
Description
The park brake cylinder, mounted on the front axle, releases
and applies the park brake. The park brake cylinder consists
of a hydraulic cylinder and a lever. When the operator
positions the PARK BRAKE switch to ON, the park brake
solenoid valve de-energizes and closes the valve, removing
hydraulic force from the cylinder’s piston. This allows the
cylinder’s spring to extend, retracting the cylinder lever, and
applying the park brake to hold the crane in place. When the
operator positions the PARK BRAKE switch to OFF, the park
brake solenoid valve energizes and opens the valve to apply
hydraulic force to the cylinder’s piston. This allows the piston
to compress the spring, extend the cylinder lever, and
release the park brake.
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