Case WX145 Operator's Manual page 43

SECTION 1
UNDERCARRIAGE
The undercarriage of the hydraulic excavator is
used as a stable base and for travelling.
The undercarriage is moreover equipped with com-
ponents permitting stabilization of the machine dur-
ing working operations, such as the levelling blade
and the stabilizers.
The machine is driven hydraulically by oil motors
and travel gearboxes acting on both axles.
Undercarriage and upper structure are connected
by a slewing ring.
UPPER STRUCTURE
The upper structure accommodates the drive
engine and part of the hydraulic and electrical sys-
tems.
The upper structure carries also the working attach-
ment.
HYDRAULIC SYSTEM
All travelling and working movements are executed
hydraulically. The operational controls are activated
by hand and are transmitted via control circuits. The
oil flow between upper structure and undercarriage
is ensured by the rotor. The hydraulic system is pro-
tected against possible overloads by the pressure-
relief valves.
STEERING
The machine is equipped with a hydrostatic power
steering system, that is it can be steered by hand
with increased force when the engine is not running
or when the hydraulic steering pump has failed.
SERVICE BRAKE
The service brake is composed of four multi-plate
brakes integrated in the wheel hubs. The brake is
operated hydraulically.
To ensure the braking function at all times, the brak-
ing system is equipped with hydraulic pressure
accumulators, which are permanently monitored.
PARKING BRAKE
The parking brake can be applied by blocking the
brake plates with spring pressure.
The parking brake is incorporated in the gearbox. In
this way it acts on all the wheels.
FLOATING AXLE
The steered axle is a floating axle. It can be locked
hydraulically during the digging operations with two
cylinders.
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