TECHNICAL DATA
42
Hydraulics
The loader has two hydraulic systems supplied by a hy-
draulic uid reservoir:
- hydrostatic drive
- steering and working hydraulics
The hydrostatic drive consists of an axial piston variable
displacement pump, which drives an axial piston motor. The
axial piston variable displacement pump is rigid coupled
directly to the diesel engine, while the axial piston motor is
directly coupled to the transfer case.
Displacement is automatic and continuous, but depends on
speed and load. The travel speed depends on the engine
speed and the machine load. Operating speed is set by
the accelerator pedal position, engine speed and torque
demand of the loading operation. Depending on load, the
variable displacement pump automatically adjusts pump
displacement to balance torque and speed requirements
within the power capability of the diesel engine. Since the
input power is limited to the diesel engine output, increased
demands from traversing a grade or loading the bucket will
result in speed reduction which increases the torque to meet
the performance demand. This adjustment control allows
the entire range of performance to be utilized optimally.
Actuating the inching pedal is an override control that can
reduce wheel loader speed as operation demands. Depress-
ing the pedal to the full range will stop the travel motion
of the wheel loader. The inching pedal permits an innite
number of control positions. The inching pedal provides the
service brake function by destroking the pump until no uid
is transmitted between the pump and motor.
A gear hydraulic pump supplies the steering and working
hydraulics with oil. The gear pump is rigid coupled to the
drive‘s variable displacement pump. Pump ow output is
directly proportional to the diesel engine speed.
The hydraulic system is equipped with relief valves, lters
and oil coolers.
To Next Page
Loading...
Need help?
General
