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5-6
ENGINE STARTS BUT MACHINE DOES NOT OPERATE AT ALL
2)
Hydraulic pump is
broken.
ͽ
Pilot valve is
faulty.
Pilot relief valve is
faulty.
Gear pump is
broken.
Replenish
specified oil to
the standard
level.
Disassemble
and repair.
See item 1).
at page 5-5
Clean pilot
piping interior or
repair piping.
Disassemble
and repair.
Repair or
replace.
Disassemble
and repair.
YES
YES
YES
YES
YES
YES
YES
NO
NO
NO
NO
Is oil level in
hydraulic oil
tank within
standard level?
Do not hydraulic
pump and pump
connections
make abnormal
noise?
Abnormal noise
comes out of
pump
connection
Is primary pilot
pressure within
standard level?
Is not pilot piping
clogged or is not
oil leakage present
on pilot piping?
Is gear pump
delivering oil?
Abnormal noise
comes out of
hydraulic pump
ͽ
NO
YES
Cause
Remedy