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5-21
YES
YES
YES
YES
YES
NO
NO
NO
NO
NO
Is MCV pilot
pressure within
standard level?
Does the
symptom change
when port relief
valve is replaced
with other valve?
ONLY BUCKET OPERATION IS TOTALLY IMPOSSIBLE
5)
Port relief valve is
defective.
Cylinder interior is
broken.
Control valve
spool is stuck.
Pilot valve is
faulty.
Disassemble
and repair or
replace.
Disassemble
and repair.
Disassemble
and repair.
Disassemble
and repair.
Does control
valve spool
move smoothly
by hand?
BOOM, ARM OR BUCKET POWER IS WEAK
4)
Is relief pressure
in main relief
valve within
standard level?
Is cylinder
internal leakage
within standard
level?
Is relief pressure
in port relief
valve within
standard level?
Cylinder is faulty.
Port relief valve is
faulty.
Main relief valve
is defective.
Check according
to the procedure
in Item "Speed is
low".
Disassemble
and repair.
Adjust pressure,
repair or replace.
Adjust pressure,
repair or replace.
Cause
Remedy
Cause
Remedy
YES
NO