3-4 BA 35203_04 * 3.0 * 35203_04_03_Einleitung.fm
3 Introduction
Hydrostatic drive
The diesel engine permanently drives a gear pump (variable displacement
pump), whose oil flow is sent to a hydraulic motor on the transfer gearbox
(standard - 20 km/h/12.43 mph) or to a high-speed gearbox (option – 30
and 40 km/h/18.64 and 24.85 mph).
The hydraulic motor transmits its power to the rear axle (via the transfer
gearbox) and to the front axle (via the cardan shaft) to create permanent 4
wheel drive. If the machine is equipped with a high-speed gearbox, power
is transmitted to the front and rear axles via the cardan shaft.
Operating hydraulics and 4 wheel steering
The diesel engine also drives the joint gear pump for the operating
hydraulics and the hydrostatic 4 wheel steering. The oil flow of this pump
depends on the diesel engine speed only.
When the machine is in operation, the entire diesel engine output can be
transmitted to the gear pump for the operating hydraulics and steering.
This is made possible by a so-called inching valve that responds as soon
as the brake/inching pedal is used, reducing or cutting off power input of
the drive.
Therefore, engine output is fully available for the operating hydraulics
(loader unit) by pressing the accelerator pedal and the brake-inch pedal at
the same time.
Cooling system
To cool the engine and the hydraulics, a combined water-hydraulic
radiator is located in the engine compartment. The fan motor is
hydraulically operated.
Furthermore, the charge air of the engine is cooled by an intercooler.
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