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Valtra is introducing a new generation of front linkage. Valtra’s innovative
LHLINK front linkage attaches to the tractor’s frame by a vertical pivot,
allowing the linkage to turn in the desired amount with the front wheels or
even independently of the front wheels. In addition, the levelling of the
lifting arms in relationship to each other can be adjusted vertically. The
lifting capacity of the Valtra LHLINK front linkage is 3.5 tons.
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Valtra LHLINK front linkage received the silver Innovation Award at the
Agritechnica exhibition in Hanover, Germany in 2007. |
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Four control modes are available for adjusting how
the front linkage turns:
1. The front linkage turns fully independently of the front wheels.
2. The front linkage turns in relation to the front wheels, and the ratio
between the turning angle of the front linkage and the steering angle of the
wheels can be adjusted infinitely. The response in the middle of the
adjustment range is 50%, so at a 35-degree steering angle the front linkage
turns 17.5 degrees. At a response of 1:1 the turning angle of the front
linkage is the same as that of the front wheels all the way up to 35
degrees, which is the maximum turning angle of the front linkage in either
direction.
3. The front linkage operates as above, but the central position of
the front linkage can be varied in either direction.
4. The fourth mode is designed especially for operating front and
rear mower combinations, allowing a higher turning angle for the front
linkage than for the wheels.
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The position of the lifting arms in relation to each
other can be adjusted hydraulically, after which the position is locked
hydraulically. There is no mechanical torsion bar between the lifting arms,
which saves space. The cylinders are equipped with linear transmitting the
position to the electronic control unit. |
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