Doosan DA40 - Vibration when the clutch or reverse gear is engaged; Vibration when alternator is in operation

Engine
SHOP MANUAL
Ch 1 page 237
Vibration when the clutch or reverse gear is engaged
Vibration when alternator is in operation
Eect Cause Trouble shooting Action
Imbalance in driven unit - Balance the unit
Imbalance in clutch
Inadequate alignment
between engine and
driven unit
Check alignment
- Carry out alignment
more accurately
Unsuitable suspension
of engine or driven unit
Weak engine bed
Movement at attachment
points
- Reinforce the engine
bed
Defective exible
coupling between
clutch/reverse gear and
driven unit
- Change rubber ele-
ment in exible cou-
pling (consumption
item)
Unsuitably mounted
propeller shaft, e.g.
excessive deection
angle or excessive devi-
ation in parallelism
between anges
- Reposition the engine
or driven unit so that
the propeller shaft’s
working range is in
accordance with rec-
ommendations
Propeller shaft too long
and weak
Eect Cause Trouble shooting Action
Imbalance in generator
Imbalance in coupling
Dismantle the coupling. Assemble the coupling
halves rotated half a turn relative to each other
Bearing damage in alter-
nator
Defective exible cou-
pling between engine
and alternator
- Change the rubber ele-
ment or type of cou-
pling
Fault in reduction gear