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SECTION 3
Pronar T286
3.2.10 TURNING INTERLOCK HYDRAULIC SYSTEM
The hook trailer is equipped with a passively steered rear steering axle. This solution
facilitates manoeuvring the vehicle, improves stability while driving on turns, reduces
disadvantageous forces in suspension system and chassis which occur while turning.
Consequently, the wear of tyres is reduced and it is easier to drive the tractor with a trailer.
While reversing, the rear axle steering knuckles should be locked. Otherwise, the trailer will
tend to turn in an uncontrolled manner to the left or to the right. The hydraulic system of the
interlock is supplied by the tractor's external hydraulic system through the hydraulic conduits
(2) which are connected to the sockets of a single section of the tractor's hydraulic system by
means of quick couplers (3). The axle is locked by withdrawing or extending the hydraulic
cylinders rods (1). Shock absorber (4) ensures stability of the steering axle and reduces its
excessive vibrations.
FIGURE 3.17
Design and diagram of the hydraulic system of the rear axle turning
interlock
(1) turning interlock cylinder, (2) hydraulic conduit, (3) hydraulic quick coupler, (4) shock
absorber
3.23
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