6 - 19
YES
YES
YES
NO
NO
YES
NO
NO
NO
NO
YES
NO
YES
NO
YES
NO
YES
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 pilot valve
normal?
Are LH/RH travel
speeds within
standard levels?
Is combination of
oil streams normal
at boom hoisting
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?
NO
YES
YES
YES
NO
YES
NO
NO
NO
NO
YES
NO
OK
ڞ
ڟ
Flow summation
check valve spool
is stuck.
Hydraulic pump is
faulty.
ڠ
ڡ
Port relief valve is
faulty.
Cylinder is faulty.
Control valve spool
is stuck.
Pilot valve is
defective.
Pilot relief valve is
faulty.
Gear pump is
broken.
Pilot valve is faulty.
Normal.
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.
ڞ
ڟ
ڠ
ڡ
BOOM, ARM OR BUCKET SPEED IS LOW
2)
Does control valve
spool move lightly
by hand?
Is not MCV pilot
pressure piping
clogged or is not
there oil leakage?
Is gear pump
delivering oil?
Is pilot piping not
clogged or is oil
not leaking from
the piping?
Is MCV pilot
pressure within
standard level?
Is primary pilot
pressure within
standard level?
Is engine
revolution within
standard level?
Is not orifice in
control valve
clogged?
Cause
Remedy
Summary of Contents for R 160 LC-3
Page 9: ......
Page 142: ...4 4...
Page 182: ...4 44 No of pin Receptacle connector Female Plug connector Male 24 12 24 1 13 S815 024000...
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Page 416: ...8 103 Remove lock nut 21 and then boot 26 15...
Page 427: ...8 114 Install cover 3 to hub 1 and tighten bolts 14 Torque 5 5 12 5kgf m 40 90lbf ft 7 14 15 3...
Page 456: ...8 143 1 STRUCTURE GROUP 11 WORKEQUIPMENT SECTION A SECTION B SECTION C C B B A A C...