BELARUS-1221.2/1221
В
.2/1221.3 Description and operation
117
Electro-hydraulic FDA Drive Control System
Fig. E-28. Rear axle differential lock-up (DL) and FDA drive control system:
1 – control panel; 2 – steering wheels turning angle sensor; 3, 10 – control electro-hydraulic distributors for
the DL and the FDA drive, respectively; 4 – terminal blocks; 5 – connecting cable; 6 – DL control key; 7, 12 –
indicator lamps; 8 – loop; 9 – automatic FDA drive control sensor; 11 – FDA drive control key.
The electro-hydraulic control system of
the rear axle (Fig. E-28) consists of the
panel (1), automatic control sensor (9)
FDA reduction gear, FDA drive clutch
control electro-hydraulic distributor (10)
located on the right-hand GB cover and
connecting cables (5) with terminal blocks
(4). The system is supplied with power
from the on-board power system via a
safety fuse in the fuse box installed in the
dashboard. The system is powered after
starting the engine. The key (11) of the
FDA drive control and the FDA drive en-
gagement indicator lamp (12) are in-
stalled on the panel (1) face. The latter is
located over the tractor right-hand side
control panel.
Note:
A braking relay is provided in the
FDA drive control electric circuit. It en-
sures the automatic engagement of the
drive when stepping on the interlocked
service-brake pedals.
How To Use the Front Driving Axle
Control Key (11)
1. When performing jobs with great extent
of slippage of front wheels, press the
upper part of the key (11) having acti-
vated the automatic FDA drive control
mode. When it will be done, the auto-
matic control is exercised depending
on tractor slippage, which is sensed by
sensor (9) of automatic control. When
rear wheels are slipping, the sensor (9)
closes contacts and energizes the
electromagnet of the control electro-
hydraulic distributor (10). When slip-
ping intensity drops, the sensor (9)
beaks contacts to de-energizing the
electromagnet and disengage the FDA
drive, respectively.
2. If the job requires operation with for-
ward and reverse moves, with the FDA
engaged all the way through, depress
the lower part of the key (11). To dis-
engage the FDA drive, press the key
(11) to its middle position.
Summary of Contents for 1221.2
Page 1: ...BELARUS 1221 2 1221В 2 1221 3 1221 0000010РЭ OPERATORS MANUAL 2009 ...
Page 290: ...BELARUS 1221 2 1221В 2 1221 3 Supplement 293 Electrical scheme of tractor connections ...
Page 291: ...BELARUS 1221 2 1221В 2 1221 3 Supplement 294 Variants of tractor connections ...
Page 293: ...BELARUS 1221 2 1221В 2 1221 3 Supplement 290 826 3805010 instrument board scheme ...