Belarus 1523, Operating Manual

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BELARUS-1523/1523 В /1523.3 /1523В.3 Construction and Operation
91
GEARBOX REDUCTION GEAR CONTROL SYSTEM
The Electrohydraulic System incorpo-
rates a control panel (1) located in the
tractor cab to the right of the operator,
lever (3) for shifting gears and selecting
the reduction gear stages, GB neutral
position sensor (5), transducers (7) and
(8) installed on the reduction gearshift
hydraulic cylinder, electrohydraulic dis-
tributor (6) mounted on top of the GB
cover and connecting cables (4) with
terminal blocks (9). The system is ener-
gized from the on-board electric circuit
through a safety fuse box (2). The elec-
trical power is supplied to the system
before starting the engine (after turning
the starter and instrumentation switch to
the “Instrumentation Supply” position).
The buttons (10, 11) and annunciators
(LEDs) (13, 12) for engaging the lower
and higher stages of the reduction gear
are fitted on the handle of the lever (3),
respectively.
The warning lights (15 and 14) of en-
gagement of the lower and higher
stages of the reduction gear and the re-
duction gear control relay are located on
the panel (1).
ATTENTION! This system allows the
reduction-gear stages to be selected
only provided the lever (3) is in neutral
position (i.e. the sensor (5) contacts of
the GB neutral are closed). The reduc-
tion gear stages shall be switched over
on the stopped tractor.
The signals are sent to the annunciators
(13, 12) and warning lights (15, 14) from
the respective pressure transducers (8
and 7).
After starting the engine, the reduction
gear lower stage is initially engaged.
When it will be done, the annunciator (13)
and the warning light (15) shall light up.
Upshifting to the reduction gear higher
stage is achieved by pressing the button
(11). At the same time, the lights (13 and
15) shall go out and the annunciator (12)
and the warning light (14) shall light up.
Downshifting from the higher to lower
stage is done by pressing button (10).
The electric diagram of the GB reduction
gear, differential interlock and FDA con-
trols is shown in the Section “Appendix”.
1 – control panel; 2 – safety fuse box; 3 – lever for shifting gears and selecting the reduction gear stages;
4 – connecting cables; 5 – GB neutral sensor; 6 – electrohydraulic distributor of the reduction gear; 7 –
higher stage pressure transducer; 8 – lower stage pressure transducer; 9 – terminal blocks; 10 – lower
stage selection button; 11 – higher stage selection button; 12 – light-emitting diode (LED) of the higher
stage; 13 - light-emitting diode (LED) of the lower stage; 14, 15 – warning lamps.