5-12
YES
YES
YES
YES
NO
NO
NO
NO
NO
YES
Is return spring
of swing control
valve normal?
Is brake spring
normal?
Is swing shuttle
valve normal?
Is drain rate of
swing motor
within standard
value?
THE SWING UNIT DRIFTS WHEN THE MACHINE IS AT REST ON A SLOPE
5)
ͽ
Is swing relief
pressure within
standard level?
ͽ
Shuttle valve is
faulty.
Brake spring is
faulty.
Return spring of
swing control
valve is faulty.
Swing relief valve
is faulty.
Swing motor is
broken.
Disassemble
and replace.
Disassemble
and replace.
Disassemble
and replace.
Disassemble
and repair or
replace.
Disassemble
and repair.
Adjust swing
relief valve
pressure or
replace swing
relief valve.
Cause
Remedy