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6-18
OK
NO
YES
YES
YES
NO
NO
Are LH/RH travel
operations
possible?
Does the
symptom change
when port relief
valve is replaced
with other valve?
Inspect if pilot
piping is clogged
or oil is leaking
from the piping.
Disassemble
main relief valve
and check if it is
not irregular.
Are other
attachments
operatable?
Inspect oil
volume in
hydraulic oil tank.
Is MCV pilot
pressure within
standard level?
Is gear pump
pilot pressure
within standard
level?
Is gear pump
delivering oil?
Particles present
YES
OK
Faulty
Port relief valve is
faulty.
ⓐ
RCV is faulty.
Pilot relief valve is
faulty.
Gear pump is
broken.
Hydraulic pump is
broken.
Main relief valve
is defective.
Coupling at pump
connection is
broken.
Cylinder interior is
broken.
MCV spool is
stuck.
Disassemble
and repair or
replace.
Disassemble
and repair.
Disassemble
and repair or
replace.
Disassemble
and repair.
Disassemble
and repair.
Disassemble
and repair or
replace.
Disassemble
and repair.
Replenish
hydraulic oil.
Disassemble
and repair.
Disassemble
and repair.
ⓐ
Remove dust plug
under engine
flywheel and
check if coupling
element particles
are not present.
6. ATTACHMENT SYSTEM
BOOM OR ARM ACTION IS IMPOSSIBLE AT ALL
1)
Short
Does control
valve spool
move?
Cause
Remedy
YES
YES
YES
NO
NO
OK
NO
NO
See Note 3, 4
See Note 1
See Note 5, 6
Summary of Contents for HX130 LCR
Page 11: ...1 1 SECTION 1 GENERAL Group 1 Safety Hints 1 1 Group 2 Specifications 1 10 ...
Page 174: ...4 5 MEMORANDUM HYUNDAI HEAVY INDUSTRIES CO LTD CONSTRUCTION EQUIPMENT DIV ...
Page 536: ...8 108 125LCR8TM30 Turn casing 1 upside down and remove oil seal 3 using jig 29 ...
Page 566: ...8 138 Remove lock nut 22 and then boot 23 14 36078RL14 2507ARL10 ...