E. Check the integrity of the circuits
and units of the starter interlock
system with the gearbox engaged as
well as of the automatic disconnection
of the starter after starting the engine:
a) check the integrity of the circuit from
the interlock relay (K6) to the switch SA11
on the gearbox casing. To do this,
connect the test lamp between the
terminal “+” of the storage battery and the
terminal “88” of the relay (wire Кч), (Fig.
11). When it will be done,
• the lamp shall be lit when the gearbox
lever is set to the neutral position and
intact circuit being checked;
• the lamp shall not be lit when moving
the gearbox lever to the OFF position or,
if there is a fault in the circuit being
checked.
b) Check the integrity of the connection to
the body at the terminal "86" (wire Г) of
the interlock relay.
NOTE! The permanent “ground” jumper
between the relay bracket and the
dashboard casing.
c) Check the integrity of the circuit from
the starter interlock relay (K6) to the
alternator terminals "Д", (Fig. 12) when
the engine is not running and battery
disconnect switch is set to the ON
position:
• connect one wire of the test lamp to the
relay terminals "85" (wire Р) and another
– to the tractor body;
• bridge shortly the terminals "+" and "Д"
on the alternator.
The test lamp shall be lit.
If the lamp is not lit, the circuit is broken.
ATTENTION! After checking remove
the jumper.
Fig. 11. Checking the integrity of the interlock
circuits to the switch on the gearbox casing:
1 – interlock switch SA11;
2 – starter interlock relay K6;
“А” – neutral position of the gearbox control.
Note! Energize the test lamp (3) from the
central fuse or from the starter.
Fig. 12. Checking the integrity of the circuit
from the interlock relay K6 to the terminals “Д”
of the alternator “G1”:
1. Alternator;
2. Interlock relay;
3. Test lamp.
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