LiuGong CLG835H, Service Manual

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January 24, 2017 Structure Function Principle
CLG835H Steering hydraulic system
Structure and working principle of components
The priority valve is installed on the inner side of left web plate of rear frame and close to hinge position.
Hydraulic oil from the plunger pump enters into metering pump via priority valve and then flows into
steering cylinder to realize left-right turning. The priority valve realizes the steering priority function.
Working principle: during single steering, P port of metering pump communicates with L (or R) port, the
channel from LS to T is closed and the channel from LS to L (or R) is open. LS oil pressure acts on left
side of priority valve spool so that the spool moves rightwards, the opening of CF channel increases and
the opening of EF channel decreases. This is steering priority.
Schematic of priority valve
Outline diagram of priority valve
P18H00032
P18H00033