Presentation
8 General
VOE 2134355130
Main control valve
The control valve consists of two 5-spool blocks and an intermedi-
ate 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 ser-
vo hydraulic system.
Track motor and gearbox
The track motor is a variable axial piston motor that consists of a
housing, a rotary group and a port plate. The housing contains the
swash angle control screw. The rotary group consists of the cylin-
ders and the pistons. The port plate consists of the counterbalance
valve, the check valves, the relief valves and the displacement
changeover valve.
The gearbox has a three-stage planetary mechanism has three
sets of sun gears, planetary gears and pinion gears, driven by the
splined output shaft of the track motor mounted directly to the
gearbox. The gearbox also houses the spring applied, hydraulical-
ly released parking brake assembly.
Swing motor and g earbox
The swing motor is a fixed axial piston motor. The rotary group
consists of a cylinder block and nine pistons located in the cylinder.
The cover section has relief valves, an anti-cavitation valves and
anti-rebound valves. The housing has a delay valve and a disk
type brake.
The gearbox is composed of the sun gear, the planetary gear, the
pinion gear and the housing. The power supplied to the output
shaft of the swing motor reduces motor speed through the sun
gear and the planetary gear, developing high torque that is trans-
mitted to the pinion gear.
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