Operator`s manual

RD 27 Operation
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4.14 Braking System
See Graphic: wc_gr002310
The machine’s hydraulic system is the main source of movement and
braking. Moving the forward-reverse lever to either the forward or
reverse position causes hydraulic oil to flow through the drive motors.
Hydraulic oil flow causes the motors to turn and thus the machine to
move. When no hydraulic oil flow is delivered to the drive motors, the
machine does not move.
To aid in holding the machine in a stopped position (parked), there is
a mechanical parking brake on each drum drive motor. The
mechanical parking brakes are spring-activated and hydraulically
released (SAHR) type brakes. The brakes are applied when: the diesel
engine is switched off, the operator leaves the seat, or there is a fault
in the hydraulic system.
The mechanical parking brakes may also be activated by a push
button (h) on the control console.
Pushing the button downward sets the brakes.
The “Brakes On” warning light illuminates when the button is
pressed.
Pulling the button upward re-enables the brake release function.
Note: The forward-reverse lever must be in the neutral position in
order for the push button to allow the release of the brakes. If the
forward-reverse lever is not in the neutral position when the parking
brake push button is pulled out, the brakes will not be released.
CAUTION: Under normal operating conditions, do not use the parking
brakes when the machine is moving. The parking brakes should only
be used when the machine is moving in cases of emergency, e.g.,
following failure of the main hydraulic braking system (moving the
forward-reverse lever to the neutral position) or in a runaway condition
traveling down a slope. Using the parking brake while the machine is
moving may cause damage to the drive motors.
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