WEICHAI WP6GTA - Page 89

Weichai America Corp.
88
d) Unstable charging voltage
Failure4: Unstable charging voltage
Vehicle fault
Fault testing
Troubleshooting
When engine
runs normally,
voltmeter
indicates
charging, with
its needle
wobbling, and
it is impossible
to identify its
reading (or
charging
indicator comes
on and goes out
repeatedly).
a. Alternator and related belt is loose, belt
slippage.
Tension alternator and related belt.
b. The joints of charging circuit get loose
causing bad connection
Inspect all connections of charging circuit.
c. Dirt accumulation at slip ring,
excessive wear of electric brush, or brush
spring is weak or broken
Remove dirt, or replace electric brush and its spring.
d. Regulator damaged.
Replace the regulator.
e) Abnormal noise from alternator
Failure 5: Abnormal noise from alternator
Vehicle fault
Fault testing
Troubleshooting
Alternator
sounds
abnormally
during its
running.
a. Deformed alternator mounting bracket
or getting too close with external engine
body
Improve the mounting bracket strength and adjust
mounting condition.
b. Alternator belt is loose causing
slipping
Replace the alternator belt.
c. Loose alternator pulley
Tighten pulley
d. Alternator bearing oil shortage or
damaged
Replace the alternator bearing
e. Muffled noise from the inside of
alternator
Stator coil is short circuited, and should be replaced.
f. Whistle noise from alternator changing
with speed.
It is a noise produced by vibration of stator core
vibration, and replace stator assembly if necessary.