3.5. Signalling of application of the
parking brake
The signalling of application of the parking
brake is ensured by the operation of the
following devices:
a) pilot lamp located in the right block of
pilot lamps (HG1);
b) switch (SB3) located on the bracket on
the right niche of the cab under the
parking brake lever;
c) flasher relay (KH1) located inside the
dashboard on the right. The flasher relay
related to the thermobimetallic type
provides the intermittent operating mode
of the pilot lamp.
The pilot lamp and flasher relay are
supplied from the fuse (11) after setting
the starter and instrumentation switch
(SA6) to the “I” position.
Current path: Box (F1), wire 3-3, wire 3а-
3, SA6, wire 3б-Ж, terminal “85” power
supply relay (K4), terminal “87а”, fuse “2”
of the box (F2), wire 16-С, terminal “–”
relay (KH1), terminal “L”, terminal “1” of
the block (HG1), terminal “+” of the relay
(KH1), wire 16а-3, 16б-3, switch (SB3).
Pay attention to connecting the flasher
relay:
Terminal "–": (wire С) the voltage as
applied from the fuse 2.2;
Terminal “L”: (wire K) to the pilot lamp in
the block (HG1);
Terminal"+" - (wire 3) to the switch (SB3)
and further to the tractor body.
On applying the parking brake, the rod of
the switch (SB3) is released and its
contacts are closed. The terminal "+" of
the relay is connected with the body, the
test lamp lights up, the bimetallic contact
of the relay (KH1) begins warming up and
its periodical opening and, respectively,
flashing of the pilot lamp on the
instrumentation dashboard begins as well.
The fastening holes of the bracket have
oval shape that makes it possible to adjust
the moment of the beginning of setting the
switch to the ON position.
3.6. Connection diagram of the road
train sign lamps and radio equipment
The three lights of the road train sign are
fitted under the windscreen on the cab roof
and mounted in a separate bracket.
The switch of the lights (SA1) is mounted
on the upper panel in the tractor cab. On
setting the switch to the ON position, the
lamps (EL4), (EL5) and (EL6) of the three
orange lights and switch key illumination
light up.
The power supply voltage of 12 V is applied
from the unit (F1) through the wire 1з-Ж,
1е-Ж, to the box (F4), fuse 4.5 (15А) and
wires 45-0, 45а-0 to the switch (SA1). The
power supply voltage of 12 V for radio
equipment (А1, WA1, BA1, BA2) is applied
from the box (F1) to the starter switch
(SA6). When turning the switch key to the
“ІІІ” position is applied to the radio
equipment through the wires 21-Р, 21а-Р
and fuse (FU1) including in the complete
set of the radio recorder.
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