English-57
DESIGN AND FUNCTION
Two-wheel drive
Two-wheel drive involves driving in high gear. The entire hydraulic pump’s flow is distributed to the front cir-
cuit, as a result of which the wheel motors operate at higher speed.
A flow goes from the hydraulic pump for the drive system to the valve block for the transmission and out to
the front axle and its wheel motors. The flow distributor does not fulfil any function here; the flow just
passes by the sensor. The valve (2), controlling the flow to the rear wheels is closed to supply flow but
open for the oil to circulate in the rear wheel circuit. The flow on the rear axle is looped and mixed with the
return oil coming from the front wheel motors. What happens with the rear wheel motors is that some oil is
replaced with the oil coming from the front wheel pairs. In this oil, a certain amount has previously been
replaced with new cold oil. In this way, the oil in the rear wheel circuit is cooled.
8043-233
Circuit diagram Two-wheel drive
F=Front axle
R=Rear axle
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