Belarus 1523, Руководство по эксплуатации

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BELARUS-1523/1523 В /1523.3 /1523В.3 Construction and Operation
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shaft when harvesting, a special enclo- sure is provided.
FDA Drive Control System
The system includes a panel (1), sensor
of angle of the steerable wheel turn (11)
(if installed) located on the gearbox on
the left-hand side, two service brake ap-
plication sensors (13), sensor (7) of the
FDA drive automatic engagement, elec-
trohydraulic distributor (8) located on the
gearbox cover on the right, electric ca-
bles (9), connector socket (4) and termi-
nal blocks (12).
The system is energized in a manner
similar to the above described system of
the rear axle differential interlock.
The automatic engagement sensor (7)
consists of a pusher (13) (see Figure
“FDA drive”), guide and switch (14).
The key-switch (15) (see Figure below)
for controlling the FDA drive and warning
lamp (14) of the engaged state of the
drive are located on the panel (1).
The switch (15) has three positions:
• “Automatic FDA Control” (top fixed
position);
• “FDA Force Engaged” (lower fixed
position);
• “FDA Disengaged” (middle fixed posi-
tion).
With the switch (15) set to the “FDA Dis-
engaged” position, the electrohydraulic
distributor (8) is de-energized, the FDA
drive clutch communicates with the drain
line, and the FDA drive is disengaged.
Rear axle differential lock (DL) and the front driving axle (FDA) drive control system:
1 – control panel; 2 – safety fuse block; 3 – engagement relay block; 4 – cable connector assembly; 5 –
reverse sensor; 6 – DL control hydraulic distributor, 7 – FDA drive automatic engagement sensor; 8 –
FDA drive control hydraulic distributor; 9 – connecting cables; 10, 11 – driving wheels angle-of-turn sen-
sors; +13 degrees and +25 degrees, respectively; 12 – terminal blocks; 13 – service brake application
sensors; 14, 16, 20 – warning lights; 15 – FDA drive control selector switch; 17 – DL control selector
switch; 18 – FPTO switch (if installed); 19 – horn switch (1523В)
With the switch (15) in the “FDA Auto-
matic Control” position, the FDA drive
operates automatically, when the tractor
runs forward, due to the sensor (7)
whose engagement signal is fed to the
solenoid of the electrohydraulic distribu-
tor (8) depending on wheel slipping. The
latter directs oil flow under pressure to