The operations of the brakes and the front
differential lock (fig. 24) are controlled by
directional valves. The cylinder in the diffe-
rential lock is dual-functioning and when
disengaged, the pressure is on the side
of the cylinder shaft. When engaged, the
pressure is directed to the side of the cylin-
der piston. The brake cylinders get disenga-
ged when the pressure is directed to the side
of the cylinder shaft. The piston sides are
connected to the tank line. The brakes and
the front lock derive their driving force from
the pump in working hydraulics by means of
a pressure reducing valve.
A directional valves
B cylinders
The frame lock is equipped with a dual-function cylinder. The cylinder derives its load from the
return flow. When the frame lock is engaged, the directional valve closes the flow routes and
the cylinder becomes locked in its place.
The basic harvester is equipped with a separate cooler for the hydraulic oil. The cooler inclu-
des a pump and condenser. The pump receives oil from the tank as well as from leaks in the
working hydraulics pump and the harvester head, and its pumped through the condenser and
the return filter back to the tank.
When dealing with hydraulics, uncompromising cleanliness is of utmost importance. The oils
used shall comply with the Manufacturer´s instructions. Refill shall always be done through
the return filter.
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General