Hyundai HX140L, Manual

Page: 453 / 819

6-21
YES
YES
YES
YES
YES
YES
YES
YES
NO
NO
NO
NO
NO
NO
Is LH travel
possible?
Is MCV pilot
pressure within
standard level?
Does the
symptom change
when main relief
valves are
exchanged?
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.
MCV spool is
stuck.
Cylinder interior is
broken.
RCV is faulty.
Main relief valve
is faulty.
Hydraulic pump is
broken.
Disassemble
and repair or
replace.
Disassemble
and repair.
Disassemble
and repair.
Disassemble
and repair.
Adjust pressure,
repair or
replace.
Disassemble
and repair.
Does control
valve spool
move?
Does the
symptom change
when hydraulic
pump's discharge
hoses are
exchanged?
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
NO
See Note 7
See Note 4
See Note 5