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10 Structure and function
Travel motor
Brake valve
(PC88MR-C4Q0-044-K-00-A)
The brake valve consists of check valves (1a), (1b) and counterbalance valve spool (2) as shown in the
figure below.
Function
When the machine travels downhill, it tends to travel faster than the motor rotation because of its gravity.
If the machine travels downhill with the engine at low speed, the motor runs idle and the machine runs
away. This is very dangerous.
This valve prevents the machine from running away and makes it travel in accordance with the engine
speed (pump discharged volume).
10-124
PC88MR-10
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