Fiat Kobelco EX355 Tier2, Техническое руководство

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T5-4-50 EX355
TROUBLESHOOTING B
SWING SYSTEM TROUBLESHOOTING
S-1 Swing Speed is Slow or Swing Function
Does not Operate.
Related Fault Code: None
Checking Instructions
•••••
Check whether the pilot system is malfunctioning
or the main hydraulic system is malfunctioning.
•••••
If other functions (front attachment or travel) ope-
rate normally, the pilot pump is considered to be
normal. If the pilot system is malfunctioning, the
cause of the trouble may exist in the pilot system
after the pilot valve.
•••••
When the left travel speed is also slow, refer to
A-2.
NO
YES
Check if the pilot
secondary
pressure is
normal.
NO
YES
Check if swing
relief pressure is
normal.
NO
YES
Faulty pilot valve
Monitor the pump
control pressure.
While slowly
operating the
control lever,
check if the pump
control pressure
changes
smoothly.
Seized control
valve spool
•
Specification: Refer
to Operational
Performance Test
section.
•
Measurement:
Refer to Operation ol
Performance Test
Section
•
Monitor item:
Pump 2 Control Pressure
•
Swing relief pressure
•
Monitor item: Pump 2
Delivery Pressure
•
Specification: Refer to
Operational
Performance Test
section.
•
Measurement:
Refer to
Operational
Performance Test
section.
Check if swing
motor oil drain
amount is
normal.
Faulty swing
relief valve