Fiat Kobelco EX355 Tier2, Техническое руководство

Страница: 311 / 968

T5-4-38 EX355
TROUBLESHOOTING B
FRONT ATTACHMENT CONTROL SYSTEM
TROUBLESHOOTING
F-1 All Front Cylinder Functions are Weak.
Related Fault Code: None
Checking Instructions
•
In case where the speed is normal and power is
weak, main relief valve may be faulty (F-1). In case
where the speed is extremely slow the pump
control system may have malfunction (A-2, or A-
3) and or the pilot system also may be faulty.
NOTE
- 1 kgf/cm 2 =98.07 kPa
320 to 350 kgf/cm 2
Less than 320 kgf/cm 2
Monitor pump 1
and 2 delivery
pressures.
Main Relief Valve
is normal. Trace
the cause of the
trouble by
checking other
symptoms.
Adjust main relief
valve.
•
Monitor item:
Pump 1 and Pump 2
delivery pressure
•
Relieve boom, arm, or
bucket.
•
E mode switch: OFF
•
HP mode switch: OFF
•
Work mode: General
purpose mode.
F-2 Digging Force is Not Increased Even If
Power Boost Switch is Depressed.
Related Fault Code: None
Checking Instruction
•
Refer to the Power Boost Control page in Control
System Group in the SYSTEM Section.
Monitor the
delivery
pressures from
pumps 1 and 2.
Monitor power
boost switch.
Check if the
indication of “Pd”
is displayed or
deleted on Dr.EX
by operating
power boost
switch.
Pressure increases from less than
320 kgf/cm
2
to 350 kgf/cm
2
.
Pressure does
not increase.
•
Monitor items:
Pump 1 and
Pump 2 Delivery
Pressure
•
With power
boost switch
depressed,
check the pump
delivery pressure
change.
•
Monitor items:
Power Boost Switch
Normal
(HP mode
operation might
have been
mistaken for
Power Boost
operation.)
NO
YES
Faulty power
boost switch, or
broken harness
between power
boost switch and
MC.
Measure oil
pressure at the
port of solenoid
valve unit (SG).
•
With power boost
switch depressed,
check pressure
change.
•
Refer to Operational
Performance Test
section