46
/
167
4.2.2.6
Check the Motion of Pallelogram Mechanism
When the parallelogram is adjusted properly, tighten the fastening screws at both ends
of cardan joint connecting rod. Start the engine, continuously turn the guide wheel to
the left and right side to the maximum extent and observe the parallelogram
mechanism. Make sure that the parallelogram mechanism do not interfere with or
impact on the oil tubing mechanism of the vehicle during the rotation, and
∠
ABC
will not be straightened or get close to 180°, nor will the parallelogram be overturned.
4.3
Check the Motion of Pallelogram Mechanism
The steering system for precision agriculture machines mainly includes two types,
named as open center system and closed center system. Taking John Deere 904 tractor,
Dongfanghong 904 tractor and Case 210 tractor as example, this manual describes the
installation process of hydraulic valve group of open center and closed center
systems.
4.3.1
Install Hydraulic Valve Group of Open Center System
The hydraulic valve group of open center system has such mechanical connections to
the agriculture machine as shown in the figure below.
Figure 68 Connection diagram of open center hydraulic system
Steering wheel
Tractor steering gear
Navigation valve group
Steering actuator
Oil
tank
Oil
pump
