72
3.
Generator output current
unsteady
Generator belt loosened
Rotor and stator windings
being nearly short circuited
or broken
Carbon brush spring
weakened and poor contact of
carbon brush
Terminals loosened
4.
Abnormal sound from
generator
Generator wrongly mounted
Generator bearings damaged
Rotor hitting stator or other
parts
Adjust belt tension or replace the belt with
a new one
Repair or replace rotor or stator windings
with new ones
Repair or replace carbon brush spring with
a new one
Check and repair
Remount the generator correctly
Replace generator bearings with new ones
Check and repair
5.3.3
Starter
Troubles & possible causes
Fixing methods
1.
Starter not working
Connecting wire broken or
poor contact of wire
connection and switch
contacts
Fuse blown
Battery nearly exhausted
No contact of carbon brushes
with the commutator
Inner short circuit of starter
2.
Starter running but unable to
start the engine
Shaft bushing excessively
worn out.
Poor contact of carbon
brushes with commutator
Commutator surface burnt
or with oil stain
Welded joint between
armature conductor and
commutator broken
Poor connection of cable &
clamp
Weld or replace with new connecting wire,
clean the oil stain on contacts and tighten
all the nuts on connecting points
Replace with the fuse of specified current
rating
Charge battery
Check carbon brushes and adjust brush
spring force to get good contact
Remove short circuit
Replace with a new shaft bushing
Wash the commutator surface, shave the
brush contacting surface and adjust spring
force
Grind rough the commutator surface,
remove oil stain from commutator surface
Re-weld
Tighten clamping nuts to get good
connection
