Steering axle :
The steering axle follows the vehicle and works from the movement caused by
the curves, it must be locked on the highway (at medium or high speed) and in
reverse.
The self-steering axle is a follower controlled by a cylinder located on the
drawbar of the vehicle, it is a closed hydraulic circuit with accumulators to
maintain pressure. It requires the installation of a clevis on the tractor. Note that
the self-steering Rolland axle can become a follower axle when a tractor is
without a clevis because locking cylinders of the follower axle have been
retained. The advantage of this system is that the driver does not need to
intervene when driving, neither forward nor in reverse.
The running gear with 1 self-steering axle are composed mainly of the following
element :
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