Fiat Kobelco EX355 Tier2, Техническое руководство

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T5-4-40 EX355
TROUBLESHOOTING B
F-3 Some Cylinders Do Not Move or Speeds
are Slow.
Related Fault Code: None
Checking Instructions
•
Discriminate whether the cause of the trouble is in
the pilot system or in the main circuit system.
•
If other functions (travel, swing) are normal, the
pilot pump is considered to be normal.
•
If bucket single operation speed is slow, refer to
F-6 as well.
•
If arm roll-in single operation speed is slow, refer to
F-7 as well.
•
If boom lower single operation speed is slow, refer
to F-8 as well.
Check if the pilot
valve delivery
pressure is
normal by
monitoring or
measuring.
NO
YES
•
Pilot valve delivery
pressure: Refer to
Operational
Performance Test
section.
•
Monitor Item:
Arm Roll-In Pilot
Pressure
•
When measuring the
pilot valve delivery
pressure for boom
raise or lower, bucket
roll-in or roll-out, or
arm roll-out, install a
pressure gauge to the
control valve pilot oil
port.
•
Monitor item:
Pump 1 and
Pump 2 Control
Pressure
Check if the pilot
valve delivery
pressure is
correct at the inlet
port of the
shockless valve.
Monitor pump
control pressure
by slowly
operating the
control lever.
Check if the
control pressure
changes
smoothly.
•
Only when
rolling out the arm.
Check if overload
relief pressure is
normal.
NO
YES
NO
YES
NO
YES
Faulty cylinder
(Seal kits are
faulty.)
Faulty overload
relief valve
Control valve
spool is sticking.
Faulty pilot valve
Seizure of
shockless valve
spool.
1 - From swing left pilot valve
2 - From swing right pilot valve
3 - From bucket roll-out pilot valve
4 - From bucket roll-in pilot valve
5 - From boom raise pilot valve
6 - From boom lower pilot valve
7 - From arm roll-out pilot valve
8 - From arm roll-in pilot valve
Shockless Valve
SM0634
8
7
6
5
4
3
2 1