BELARUS-1021/1021.3
Operating manual
126
10 Alternator
10.1 Voltmeter shows no charging after starting engine and then during entire work
The plus terminal broken or short-circuited
to the alternator housing;
Disconnect the rectifier, solder and insulate
the point of failure. Isolate the damaged
insulation point
Broken circuit of the excitation coil
Disassemble the alternator, solder and
insulate the damaged point, if impossible to
correct this fault, replace the excitation coil
Short-circuit of one of the stator phases to
the alternator housing
Replace the stator
Short-circuit of the power rectifier terminals,
or breakdown in forward and reverse diodes
Replace the rectifier unit
Faulty voltage regulator
Replace the voltage regulator
10.2 Alternator does not develop its full capacity
Broken wires leading to the regulator
Solder and insulate the point of failure
Broken one of the stator phases
Replace the stator
Turn-to-turn short circuit of the stator
winding
Replace the stator
Turn-to-turn short circuit of the excitation
coil winding
Replace the excitation coil
Faulty one of the power rectifier diodes
Replace the rectifier unit
10.3 Systematic overcharge of storage battery
Faulty voltage regulator
Replace the voltage regulator
Short-circuit to the housing of terminal “SH”
of the voltage regulator
Isolate the damaged insulation point
10.4 Noise in alternator
Drive belt slip or excessive tension
Adjust the drive belt tension
Excessive wear of bearings
Replace the bearings
11 Start preheater
(only on BELARUS-1021)
Solenoid valve of the engine start preheater does not operate
No contact in the circuit of the SPH solenoid
coil.
Check integrity of the electrical control
circuits of the SPH, tighten the contact of wire
fastening to the EPT.
