The root cause of the breakdown that occurred in the hydraulic systems is the most serious and troublesome work for a company. Technicians or maintenance team must have a very good knowledge and skills about this matter.
The hydraulic system is a closed circuit so that makes it hard to find any fault.
Approaching troubleshooting..
The system is noisy
- The pump is fault
- The oil level in the tank of the pump is low
- There are air bubbles in the system
Consists of evaporating in the oil.
Safety valve is malfunction
Check the connection assembly pump and electric motor
Spring of the check valve is broken
Excessive number of elbows in the pipe line
The diameter of the suction pipe is small
Suction line filter is clogged
The hydraulic circuit pressure is low
- The hydrolic pump is fault
The setting of the pressure reducing valve is low
There is a leak in the hydraulic circuit
Leaking in the cylinder seal
The hydraulic circuit pressure is high
- The fluid is dirty due to the return line filter contamination
The pressure control valve is defective or not adjusted
There are air bubbles in the system
Abnormal main bearing clearance
Low Flow Circuit
- Pressure setting of the safety valve is too low
Decreased lub oil on moving surfaces
Cylinder or electric motor is faulty
The oil viscosity is high
The fluid level is low
The setting of the flow control valve is insufficient
The whole of the fluid returning to the tank through the safety valve
Reverse the direction of rotation of the electric motor
The hydraulic pump is fault
RPM of the pump is insufficient
High Flow Circuit
- The pressure control valve is defective or pressure setting is too high
The setting of the flow control valve is too high
RPM of the electrical motor of the pump is not suitable
Power of the hydraulic pump is more than enough
Faults in Directional Control Valves
- The contact surface of the valve is worn out
The return spring in the valve is broken
There is deposit or sludge in the valve
The connections to the solenoid of the valve is incorrect
The valve is not set
Fluid The in The Circuit is Overheating Quickly
- There are air bubbles in the fluid
Hydraulic circuit return line may be clogged
There is clearance in the pump
Fluid is contaminated
Excessive pressure drop
The cooling system is out of circuit
Excessive fluid circulation
The fluidity of the fluid is not available
...to be continued
