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6-19
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
Is speed low only
in composite
operation?
Are other
attachment
speeds within
standard levels?
Does the
symptom change
when port relief
valve is replaced
with other valve?
Is RCV normal?
Are LH/RH travel
speeds within
standard levels?
Is combination
of oil streams
normal at boom
up and at arm
extrusion?
Are both LH/RH
travel speeds
low?
Is MCV pilot
pressure within
standard?
Does spool of flow
summation check
valve move lightly
by hand?
刔
刕
Flow summation
check valve is
stuck.
Hydraulic pump is
faulty.
刖
列
Port relief valve is
faulty.
Cylinder is faulty.
MCV spool is
stuck.
RCV is defective.
Pilot relief valve is
faulty.
Gear pump is
broken.
RCV is faulty.
Normal.
Replace spring
Disassemble
and repair.
Disassemble
and repair.
Disassemble
and repair or
replace.
Disassemble
and repair.
Disassemble
and repair.
Clean pilot
piping interior or
repair piping.
Disassemble
and repair.
Disassemble
and repair or
replace.
Disassemble
and repair.
Adjust engine
revolution.
Clean orifice in
control valve.
Clean pilot
piping interior or
repair piping.
Disassemble
and repair.
刔
刕
刖
列
BOOM, ARM OR BUCKET SPEED IS LOW
2)
Does control
valve spool
move ?
Is not MCV pilot
pressure piping
clogged or is not
there oil
leakage?
Is gear pump
delivering oil?
Is pilot piping
clogged or is oil
leaking from the
piping?
Is MCV pilot
pressure within
standard level?
Is pilot pressure
within standard
level?
AIs engine
revolution within
standard level?
Is not orifice in
main control
valve clogged?
Cause
Remedy
YES
YES
YES
NO
NO
NO
NO
NO
NO
NO
OK
See Note 3, 4
See Note 7
See Note 3, 4
See Note 1
Summary of Contents for HX140L
Page 12: ...SECTION 1 GENERAL SECTION 1 GENERAL Group 1 Safety Hints 1 1 Group 2 Specifications 1 10...
Page 209: ...4 5 MEMORANDUM...
Page 694: ...8 68 125LCR8TM30 Turn casing 1 upside down and remove oil seal 3 using jig 29...
Page 734: ...8 108 Assemble plug 2 Plug NPT1 16 11 EA 17 21078TM68 21078TM69 21078TM70 21078TM71...
Page 756: ...8 130 Remove lock nut 22 and then boot 23 14 36078RL14 2507ARL10...