Doosan LIGHTSOURCE V9, Operation And Maintenance Manual

Page: 42 / 66

FAULT FINDING
38
LIGHTSOURCE V9
FAULT CAUSE REMEDY
The mast does not raise.
Pump does not operate. Battery is not connected/charged.
Key switch is not in “ON” position.
Emergency stop button is pushed in.
Pump operates but mast does not
raise
Hydraulic oil level is too low.
raise.
The hydraulic hose is defective or leaking.
Lowering valve has failed in open position.
Suction tube in the tank is defective.
Mast raises but not completely. A pulley mounting pin is defective or missing.
Cable assembly is damaged.
Hydraulic oil level is too low.
The mast lowers on its own. The mast has lowered when the
operator returns to the machine.
The hydraulic hose is defective or leaking.
The mast does not lower.
Hydraulic cylinder does not lower. Key switch is not in “ON” position.
Emergency stop button is pushed in.
The hydraulic hose is defective.
Mast is jammed or damaged in raised position.
The mast is raised while machine not levelled properly.
The hose burst valve in cylinder is damaged or blocked.
Damaged sliding pads stop the mast from coming down.
Mast falls down. Mast falls down suddenly and very
fast
Cable failed.
fast.
Pulley failed.