H-27 The Ecss Does Not Operate And Machine Pitches And Bounces - Komatsu WA250-6 Shop Manual

SEN03849-00

H-27 The ECSS does not operate and machine pitches and bounces

Check the following points with the operator.
Did the machine starts pitching and bouncing sud-
q
denly?
o Breakage of related device
Did abnormal sound come out when the machine
started pitching and bouncing? From what part did
the abnormal sound come out?
Did the machine starts pitching and bouncing gradu-
q
ally?
o Wear of related device or defective seal
Check before troubleshooting
Check that the hydraulic tank is filled with oil of a
q
proper type up to a proper level.
Check that the ECSS switch is set properly.
q
No.
Troubleshooting
Travel speed to start operation of ECSS (6 km/h) changes
1
largely
ECSS does not work while machine is loaded
2
ECSS does not work while machine is empty
3
Lift arm lowers more than 30 cm at maximum when ECSS
4
operated while machine is loaded
5 ECSS does not work at all
26
40-500
500 Troubleshooting of hydraulic and mechanical system (H-mode)
H-27 The ECSS does not operate and machine pitches and bounces
Solenoid
valve
a
Remedy
X
Q
Cause
Accumulator Controller
b c
X X
Q
Q Q
Q Q
Q
Q Q
WA250, 250PZ-6
1
Sensor
d
X
Q
Q