3.3. Fault signalling
The tractors are provided with emergency
light signalling which makes it possible to
switch on the front and rear turn indicators
simultaneously in blinking mode in case of
emergency.
The emergency fault signalling is switched
on by the switch (SB1) located on the
instrumentation dashboard, which is
connected into the circuit of the flasher of
the turn indicators (KH2). Depending on the
position of the switch (SB1) the voltage is
applied to the flasher of the turn indicators
and pilot lamp from one of two fuses over
independent circuits:
1) The fault signalling switch (SB1) is set to
the OFF position – the switch pushbutton
is sunk:
• from the fuse (12) to the terminal "2" of
the switch and further through its contacts
to the terminal "4", which is connected with
the terminal "49" of the flasher (KH2). The
flasher and signalling lamp (СЛ) operate in
the mode of the turn indicators as
described above (see item 9).
2) The fault signalling switch (SB1) is set to
the ON position – the switch pushbutton is
released, the lamp embedded in the button
is blinking:
• the voltage supplied from the fuse (3)
provides the operation of the fault signalling
when the starter and instrumentation switch
(SA6) is set to the OFF position. The
contacts of the switch (SB1) (terminals 1,3,7)
bridge the circuits of the signalling lamps of
the turn indicators of the left and right side
and the terminal "49а" of the flasher that
ensures the synchronous blinking of all the
signalling lamps of the turn indicators.
3.4. Signalling of braking the tractor
The stop light is switched on by the switch
(SB2) located on the bracket to the right
under the cab floor. The switch rod is
actuated by the arm of the right brake
pedal through a swinging bracket.
The voltage is permanently applied to the
switch (SB2) (wire Р) from the fuse (1).
When stepping on the brake pedal, the
pedal lever ceases to act on the bracket
and through the latter on the switch rod.
The rod returns to the initial position under
the action of the spring, the contacts of the
switch (SB2) are closed and the voltage is
applied (through wire 3) to the stop light
lamps of the rear light signalling units
(EL19) and (EL20) and to the terminals "6"
of the receptacle for connecting the
agricultural implements (ХА9.1).
The beginning of switching on the stop
light is adjusted by bending the shelf of the
bracket coupled with the brake pedal arm
and acting upon the switch rod by its back
side.
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