Fiat Kobelco EX355 Tier2, Technical Manual

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T5-4-54 EX355
TROUBLESHOOTING B
Seal No. Traveling Pivot Turn
1 External oil leakage
←
2
3
4
5
6
7 External oil leakage
←
T-3 One Side Track does not Move or Move
Slowly, or the Machine cannot Travel
Straight (Mistracks).
Related Fault Code: None
Checking Instructions
•
If one side system only does not operate, pilot
valve, control valve, travel motor, or center joint
might be faulty.
•
If a symptom such as bucket or swing function
speed is slow, or arm roll-in or boom raise speed
is slow during a leveling operation is recognized at
the same time, refer to A-2 and A-3.
YES
NO
Check if travel
pilot secondary
pressure is
normal.
Check if the
symptom is
reversed when
right and left
travel line hoses
connected to top
of center joint are
switched with
each other.
YES
NO
Check if travel
relief pressure in
slow speed side
system is normal.
•
Relieve travel
system.
•
Monitor Item:
Pump 1 Delivery
Pressure
Pump 2 Delivery
Pressure
•
Specification: Refer
to Operational
Performance Test
section.
NO
YES
Check if travel
motor oil drain
amount is normal.
Seized control
valve spool
Faulty pilot valve
•
Relation between Faulty Seal Position and
Mistrack Direction
1
6
5
4
3
2
7
Seal Position
Left Travel
(Reverse)
Left Travel
(Forward)
Right Travel
(Reverse)
Right Travel
(Forward)
Switch rear and
front or right and
left travel relief
valves with each
other. Check if
symptom is
reversed.
SM0638
•
Measurement:
Refer Operational
Performance Test
section