SEN03849-00
WA250, 250PZ-6 40-500 25
500 Troubleshooting of hydraulic and mechanical system (H-mode)
H-25 When the control lever is switched from “HOLD” to “TILT,” the bucket falls temporarily
H-25 When the control lever is switched from “HOLD” to “TILT,” the
bucket falls temporarily
1
Check of Phenomenon
q When the control lever is switched from “HOLD” to “TILT” gradually at low idle of the engine, the bucket
falls temporarily due to its own weight. When the control lever is completely set to “TILT,” the bucket
returns to normal.
Cause
q Improper adhesion of bucket spool check valve of the work equipment valve
H-26 The control levers of the lift arm and bucket do not move smoothly
and heavy
1
Check of Abnormality
q Refer to the criterion value table and check if the lever operating efforts are large practically.
Cause
PPC
valve
a
Defective operation of spool
No.
Remedy
Diagnosis
C
E
1 Becomes heavy in some places during operation regardless of oil pressure and oil temperature
Q
2 Becomes heavy overall during operation regardless of oil pressure and oil temperature
Q
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