“4069RT” Service and Parts Manual March 2014
Page 1-3
HYDRAULIC SYSTEM – GENERAL
H
YDRAULIC
S
YSTEM
– G
ENERAL
The hydraulic integrated circuit, generally known as the valve-type manifold system is
designed to control all or part of machine functions by integrating various hydraulic
cartridge valves into a manifold to provide directional, pressure, flow, and load control.
The hydraulic system is a feedback, load-sensing type. Generally in this type of system,
hydraulic fluid is provided by a variable displacement, pressure compensated, axial
piston type pump which is directly coupled to the engine. As the engine turns, the
hydraulic pump drains fluid from the reservoir and pumps this fluid to the Functions
Manifold.
If no function is in use, the pump remains on standby and no fluid is pumped to the
manifold. Each function has a maximum pressure control limit set by pressure relief
valve.
Figure 1-1: Hydraulic System
ART_4481
Upper Lift
Cylinder
Steer
Cylinder
Front Wheel
Motor/ Brake
Hydraulic
Pump
Functions
Manifold
Rear Wheel
Motor/Brake
Lower Lift
Cylinder
Outrigger
Cylinder x4
Hydraulic
Reservoir
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