2022.3-0000010 OM
125
3.12 Electronic system for rear-axle differential lock control, front driving axle
drive control, and front power take off shaft control
3.12.1 Rear axle differential lock control
Elements of electronic rear axle DL control system are shown in figure 3.12.1.
1 – control panel; 2 – rear axle DL control switch; 3 – rear axle DL “on” annunciator; 4
– fuse block; 5 – rear axle DL control valve group; 6 – sensor of guide wheels turning angle;
7 – bracket activating/deactivating sensor of guide wheels turning angle; 8 – bracket for at-
taching sensor of guide wheel turning angle.
Figure 3.12.1 – Rear axle DL control
The rear axle DL control system consists of the following elements:
- a button switch 2 (figure 3.12.1) of real axle DL control and a rear axle DL “on” an-
nunciator 3, located on the control panel 1;
- a sensor of guide wheel turning angle 6, mounted on the FDA at its left;
- two sensors of service brakes “on” state, located in the cab over the brake pedals;
- a valve group 5, mounted on the GB cover to its right and hydraulically linked with the
rear axle DL clutch engagement cylinder, connecting cables.
The system is powered from the tractor on-board electrical circuit through the fuse
block 4. The rear axle DL control system gets powered after the engine has been started.
The switch 2 has three positions:
- “Automatic lock” (upper part of the button is pressed – fixed position);
- “Positive lock” (lower part of the button is pressed – non-fixed position);
- “Lock off” (middle position).
In position of the switch 2 “Lock off” the rear axle DL clutch is connected with drain.
In position of the switch 2 “Automatic lock” the valve group 5 turns on, it directs oil
flow under pressure to the clutch working cavity and the rear axle DL is locked. The differ-
ential is unlocked automatically when the front wheels are turned to the angle of more than
13° to any direction from the straightline position or when one or both service brakes are
engaged.
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