Page 18
45-J Desel - Servce & Parts Manual
January 2022
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.
PLATFORM ROTATOR
JIB CYLINDER
PLATFORM LEVEL CYLINDER
BOOM EXTEND CYLINDER
BOOM LIFT CYLINDER
HYDRAULIC RESIVOIR
BRAKE / AXLE / 2 SPEED MANIFOLD
MAIN MANIFOLD
FUNCTIONS PUMP
Art_5567
DRIVE PUMP
AUXILLARY POWER UNIT
STEER CYLINDER (2)
WHEEL MOTOR (4)
TURNTABLE MOTOR
ROTARY MANIFOLD
AXLE CYLINDER (2)
PLATFORM FUNCTIONS MANIFOLD
Hydraulic System – General
Secton 10 - Hydraulc System
