MTZ 952 - Page 267

Appendix
MTZ series 900
267
4.1. Diagnostics and troubleshooting
In case of failure in the operation of the electric part of the heating and ventilation
system, the search of the faults shall be performed in the following sequence:
Fuse (16) (25А) (Box F3, fuse “1”)
Interlock relay of switching on the
fan (K3) in the dashboard
The voltage on the wire С3 to the
switch (SA4)
Relays K9 and K10
• Start the engine;
• Check the voltage at the terminal Д of
the alternator (shall be at least 8В) and
terminal “85” of the relay (K3) (wire Р);
• Check the connection to the tractor
body at the terminal “86” of the relay (K3)
(wire Г);
• Check the presence of the voltage at
the terminal “30” of the relay (K3) (wire
С3).
• Check the voltage at the terminal “85”
of the relay (K2) (wire K) and voltage at
the terminal “86” of the relay (K1) (wire 3)
in the positions І and ІІ (SA4) for the
motor with the power of 120 W.
Switch (SA4)
• Check the presence of the voltage at
the terminals “30” of the relay К9 and К10
(wire Кч);
• Check the operation of the relay K9 and
K10 (the voltage at the terminals “87”
(wires K and З) for the motor with the
power of 120 W.
Motor М1 or М7