7 - 2
Drive Motor Brake Operation
Each drive motor A incorporates a multiple disc brake pack
B. The brakes are held 'on' by spring force and released by
hydraulic pressure. They normally serve as holding brakes
but can also be used as emergency brakes.
The diagram below shows a brake in its 'off' condition, with
oil from auxiliary pump P being applied to the brake pack via
shuttle valve E (which is part of the pressure reducing valve)
and port C on the motor casing.
When the brake is selected to the 'on' condition the shuttle
valve dumps the brake circuit pressure to tank. Pressure
trapped in the brake pack bleeds quickly to tank via port D,
allowing spring pressure to apply the brake.
Section E
Hydraulics
9803/8500
Section E
7 - 2
Issue 1
Descriptions
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