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NO
5-17
YES
YES
YES
YES
NO
NO
NO
Is travel lever
operate
normal?
Is filter in pilot
piping between
gear pump and
control valve not
clogged?
Is select valve
normal?
MACHINE MAKES A CURVED TRAVEL OR DOES NOT TRAVEL AT ALL WHEN TRAVEL
AND ATTACHMENT OPERATIONS ARE EXECUTED AT THE SAME TIME
7)
NO
Select valve is
faulty.
Pilot relief valve is
defective.
Gear pump is
broken.
Normal.
Repair or
replace.
Remove dirt on
pilot line filter.
Disassemble
and repair or
replace.
Disassemble
and repair.
Is gear pump
delivering oil?
Is pilot relief
valve normal?
Cause
Remedy