Hydraulics
Hydraulics is divided in traction and working
hydraulics. They have a joint oil tank on the
rear frame of the harvester.
Traction hydraulics (fig. 22) includes a suction
filter, drive pump, distributor valve, five direc-
tional valves, a hydraulic motor at the front
and hub motors at the rear.
The drive pump produces pressure corres-
ponding to the drive resistance and a volume
flow corresponding to the drive pedal position.
When using four-wheel drive forward, the oil
flows into the distributor valve. The distributor
valve distributes the volume flow between the
front and the rear. From the distributor valve
the oil flows to the hydraulic motor at the front
and from there onwards to the pump. The oil
flows from the distributor valve to the rear
hub motors through the directional valves.
The flow from the rear motors goes though
the joint return directional valve back to the
drive pump. When using front-wheel drive,
the directional valves close off the connection
to the distributor valve and the drive pump.
At the same time they engage the rear hub
motors in neutral.
A Drive pump
B Front hydraulic motor
C Hub motors
D Distributor valve
E Directional valves
Working hydraulics in the basic harvester (fig.
23) includes a work pump, pressure filter, load
sensing directional valve and return filter.
Crane movements are controlled by a load-
sensing valve. The work pump produces the
right pressure and output in relation to the
load weight and speed. This enables fast and
precise movements in every circumstance.
A Work pump
B Pressure filter
C Directional valve
D Return filter
Individual work pump pressures are set for the harvester head functions from the measuring
device. In addition, depending on the head it is possible to set compression pressures based
on the type of tree being handled for knives and tracks/rolls, for example.
It is forbidden to change the pressure in working and traction hydraulics without
permission from the Manufacturer, as it may damage the harvester and cause risk
of injury to the mechanic and the harvester operator.
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General