LiuGong CLG835H, Service Manual

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Structure Function Principle
January 24, 2017
Steering hydraulic system CLG835H
Steering pump
Same pump is used for the plunger pump of work
hydraulic system, that is, work hydraulic system
and steering hydraulic system share one pump.
Metering pump
Main technical parameters
Structure and working principle of
components
Metering pump is located above hinge joint and
installed on bottom plate of steering column of
cab.
Working principle:
Metering pump is used to control the steering
cylinder to realize left-right turning.
1) When the steering wheel is not turned,
metering pump is in neutral position, LS port
is connected with T port, and L, R ports are
cut off.
2) When turning steering wheel to right (left),
pressure oil of P port will be connected with
R (L) port to control the action of steering
cylinder to realize right (left) steering.
3) The pressure oil of LS port is fed back to LS
port of variable pump.
Items Parameters Remarks
Rated displace-
ment
739ml/r\739cc/r
Amplification
ratio
1.6
Max pressure of
the system 24.1MPa\3494.5
psi
Max back
pressure
1Mpa\psi
Contamination
degree of
recommended
hydraulic oil
ISO18/13
Operating fluid
Anti-wear
hydraulic oil
HM46/HV46
Schematic of metering pump
P18H00030
Overall structure diagram of metering pump
1. T port
2. P port
3. L port
4. LS port
5. R port
P18H00031
1
2
4
3
5