Page 18
34-J Desel - Servce & Parts Manual
December 2021
Hydraulic System – General
The hydraulic system is designed to control all or part of machine functions by integrating various
hydraulic cartridge valves into three manifolds to provide directional, pressure, flow, and load control.
The hydraulic system is a feedback, load-sensing type. Hydraulic fluid is provided by a variable
displacement, axial piston-type Drive Pump coupled to the engine and a fixed displacement gear-type
Functions Pump mounted to the back of the piston pump. As the engine turns, the hydraulic pumps
draw fluid from the reservoir and pump this fluid to the wheel motors and valve manifolds.
Each function has a maximum pressure control limit set by pressure relief valves.
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Lift Cylinder
Boom Extend
Cylinder
Platform Level
Cylinder
Jib Cylinder
Platform Rotator
Platform Manifold
Main Manifold
Charge Filter
Assembly
Functions Pump
Drive Pump
Axle Cylinder (2)
Steer Cylinder (2)
Hydraulic Tank
Fuel Tank
Hydraulic System – General
Secton 10 - Hydraulc System
