2.1. Troubleshooting in the starting
system
А. Too low starting rotational speed of
the starter МЗ:
a) Eliminate the possible loosening of the
fastening or oxidization of the power
system circuit:
• on the storage batteries;
• on the battery disconnect switch;
• of the battery connection jumper between
the cab and the tractor body;
• on the starter terminals and fasteners.
b) Check the degree of charging of the
storage batteries.
If the rotational speed of the starter has not
changed after performing the said
operations, perform the maintenance or
repair of the starter.
B. The solenoid starter switch operates
(the sound of its operation is heard),
but the engine is not cranked:
a) if at that time the pilot lamps on the
tractor’s instrumentation dashboard
function normally:
• check and clean, if necessary, the
contacts of the solenoid starter switch,
adjust the drive mechanism;
• check the condition of the brush and
commutator assembly of the starter;
• repair the starter;
b) if at that time the pilot lamps on the
tractor’s instrumentation dashboard
become considerably dimmer:
• perform the operations specified above in
the item “A.a”.
c) if at that time the solenoid starter switch
operates cyclically:
Fig.5. Checking the integrity of the windings of
the solenoid starter switch “М3”.
1 – Starter;
2 – Pilot lamp:
“A”– of the hold-in winding;
“B” – of the pull-in and hold-in windings.
• check the integrity of the hold-in winding
of the solenoid starter switch and integrity
of the termination of its leads:
1) disconnect the following wires from the
terminals of the solenoid starter switch:
• wire “Ф” from the terminal “М5”;
• bus “+” from the power terminal to the
starter motor.
2) set the ground switch and connect the
test lamp to the terminals of the solenoid
starter switch as shown in Fig. 5. If the
windings are intact, the lamp shall be lit
dimly.
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