Presentation
8
General
Hydraulic pump
The hydraulic pump assembly consists of two pumps connected
by a splined coupling. The two pumps are driven simultaneously
as the engine rotation is transmitted to the front drive shaft.
The pump consists of rotary group, swash plate group and valve
block group.
The displacement of the pump is controlled by the regulator, and
engine output power is effectively utilized by the proportional sole-
noid valve.
Main control valve
The control valve consists of a four spool block, a three spool block
connected by screws. They contain six main spools for digging
units, three spools for conflux and straight travel, a spool for the
option unit, a main relief valve, port relief valves, holding valves
and check valves. These are remotely controlled by the servo hy-
draulic system.
Track motor and gearbox
The track motor is a variable swash, axial piston design that in-
cludes the brake valve assembly and parking brake. The rear
flange contains the counterbalance valve, check valves, crossover
relief valves and displacement changeover valve.
The gearbox composed of sun gear, planetary gear, pinion gear
and housing.
Swing motor and gearbox
The rotary group consists of cylinder block and nine pistons as-
sembles located in the cylinder. Piston assemblies are guided by
return plate and spring so they slide smoothly on the swash plate.
The cover section has a relief valve for cushioning and an anti-cav-
itation valve to prevent cavitation.
Gearbox is composed of sun gear, planetary gear, pinion gear and
housing. Power supplied to the output shaft of the swing motor re-
duces the motor speed through the sun gear and planetary gear
and the high torque is transmitted to the pinion gear.
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