SHANDONG CARTER HEAVY INDUSTRY MACHINERY CO., LTD.
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6.4 Troubleshooting of electrical control system
Fault codes of electrical control system of excavator
⑴ The engine fails to start
⑵ The engine flames out during operation
⑶ The engine fails to flame out
⑷ Automatic slow-down does not work
⑸ Slewing and traveling of all working devices
Principle diagram
1.
The engine fails to start
Fault description
The engine fails to start
The fuel pump system does not
supply fuel or supply less fuel
Low engine rpm Adjust to regular rpm
Pump fault Change
Less fuel in the tank Add fuel
Fuel tube breaks, tube connector is loose
and O ring is damaged
Change
Possible causes Standard value in regular condition and reference value offaultdiagnosis
1)
Low battery
Battery voltage Color of charge state densimeter
Above 12V Green (if it is white, change the
battery)
2) Fuse F1 and F11 fail
In case the fuse is burnt, the GND fail may happen.
If he monitoring indicator on the monitor panel is not illuminated, inspectthe
circuit between battery and specified fuse.
3)
Engine ignition
switch fault
★ Turn the start switch of engine to OFF as preparation and keep it at OFF
during diagnosis.
Ignition switch Position Resistance
Between30and17
OFF 1MΩ
Start Below 1Ω
4)
Starter relay K3 fault
★Turn the start switch of engine to OFF as preparation and keep it at OFF
during
diagnosis.
Pin Resistance
85-86 200-400Ω
87-30 Above 1MΩ
87a-30 Below 1Ω
5)
Security lock switch
fault (open circuit
inside)
★Turn the start switch of engine to OFF as preparation and keep it at OFF
during
diagnosis.
Lock rod Resistance
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