Possible Failures In The Electrical Equipment And Instructions - Belarus 922.6 Operator's Manual

6.11 Possible failures in the electrical equipment and instructions for their
troubleshooting
6.11.1 General information
Tractor "BELARUS-922.6" electrical equipment includes electrical elements (switch-
es, relays, electrical engines, tools and instruments, lamps, headlights, fuses, relay inter-
rupters, sensors, etc.) as well as wires and electrical connections which serve for coupling
the element with power supply and the body weight. To facilitate the task and troubleshoot-
ing in the electrical equipment an electric circuit diagram of the electrical equipment is at-
tached to this manual (Annex C).
Before starting operation on troubleshooting of any of electrical circuits, it is required
to study carefully the electrical diagram to familiarize yourself with the functional specifica-
tions of this device. Search for a failure can be limited by gradual detection and exclusion of
properly functioning elements of the same loop. In case several electrical elements fail to
operate properly at the same time, the most probable reason for a failure can be burning-out
of the corresponding fuse or the absence of "load" (different electrical elements in many
cases can lock at one fuse or at the same terminal of the "load").
Electrical equipment failures can be explained by simple reasons like terminals cor-
rosion, faulty fuses, burning of the insert or a switching relay defect. Check visually the
condition of all fuses, wires and electrical connections of the circuit before starting the spe-
cific check of the elements failures.
In case of using test instruments for detecting a failure, plan carefully in accordance
with the applied electrical diagram the succession of the instrument connection to the circuit
to detect the failure most effectively. The main test instruments include a tester (multimeter)
of electrical circuits, a voltmeter (a 12volt-pilot lamp can be applied with a set of connection
cables), an indicator of the circuit segment conductivity (a tester) which includes a lamp,
electrical power supply and a set of connection cables.
Electrical circuit troubleshooting cannot be regarded as a complicated task if taking
into consideration the fact that current is supplied to all electrical elements (lamp, electrical
engine, etc.) from AB by wires through switches, relays, fuses, inserts, and then goes back
to AB through tractor "weight". Any problems related to the electrical equipment failure can
be caused only by electrical current supply termination from AB or by electrical current re-
turn to AB.
Note – The information provided in subsection 6.11 "Possible failures in the electrical
equipment and instructions for their troubleshooting" shall be used for eliminating ECS fail-
ures of rear axle differential lock, RPTO shaft and partially for eliminating failures in the en-
gine electronic control system.
6.11.2 Check of voltage supply
Check of voltage supply shall be carried out in case of circuit malfunctioning. Connect
one of the tester wires either to the negative battery terminal or to the tractor safe "weight".
The other tester wire shall be connected to the terminal of the circuit electrical connection,
preferably the one located nearer to the AB or the fuse. If the pilot lamp on the tester lights
up, there is voltage on this circuit segment which proves circuit operability between this ter-
minal and AB. Acting analogically, inspect the rest part of the circuit. Detecting absence of
voltage supply indicates the failure between this circuit point and the last of the checked be-
fore (where voltage supply was detected). In most case, the reason for malfunctioning is
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