Hyundai R290LC-9 FC, Manual

Page: 25 / 40

R290LC-9 FC
25
5. Types and Causes of Ordinary Troubles
Failure Type Cause of Failure
Poor hydraulic
performance
Temperature of operating oil fails to reach normal level.
RPM of the engine is too low.
Flow of operating oil is low.
There is an obstacle on the hydraulic line.
The cooling system, pump control system or pilot line is damaged.
Oil is leaking internally (control block, valve, power unit, etc.).
The hydraulic hose is entangled or twisted.
The spool of the control valve is not opened maximally.
The relief valve is damaged or cannot be adjusted.
Internal oil leak occurs due to aging of the cylinder.
The hydraulic pump is damaged.
Poor equipment
power
The cylinder rod is bent.
The piston is jammed.
The cylinder tube has partially increased inner diameter or flaw.
Air exists in the hydraulic line.
Temperature of operating oil is too low.
The valve spool is jammed or the spring is broken.
The pump or engine control system is damaged.
The power control valve is damaged.
Engine oil is insufficient or improper lubricant is used.
Generation of
abnormal noise
The bearing is damaged.
The gear tooth of the turning reducer is worn and broken.
The gear tooth of the driving reducer is worn and broken.