Doosan DA40 - Vibration, no driven components engaged

SHOP MANUAL
Engine
Ch 1 page 236
Eect Cause Trouble shooting Action
Wrong injection timing
Broken delivery valve
spring
Disconnect one delivery pipe at a time and listen
for changes in the engine sound.
WARNING!
!
Be careful when disconnecting the delivery
pipes as the pressure is extremely high and
could cause injury
Individual injectors not
operating
Fan imbalance
Flywheel has come
loose
Crankshaft hub loosened
Abnormally worn main
bearings
Vibration or unusual
noise at
1500 - 1700 r/min
Defective vibration
damper
Drive belts run o
pulleys
Only when com-
pressed air compres-
sor is charging, worst
at about 1000 r/min,
see Compressed air sys.
Compressor operates
with excessive counter-
pressure (e.g. clogged
piping/air dryer) or
excessively high safety
valve opening pressure
Alignment fault Check engine alignment
Unsuitable rubber sus-
pension and location of
same
- Change to rubber ele-
ments of dierent
hardness
Weak engine bed
Movement at engine
attachment points
- Reinforce the engine
bed
Vibration, no driven components engaged