Hydraulic Cylinder Common Fault Diagnosis And Installation, Use And Maintenance

- Feb 28, 2018 -

Hydraulic cylinder hydraulic system is the hydraulic energy into mechanical energy of the executive components. The failure can be basically summarized as a hydraulic cylinder malfunction, unable to promote the load and the piston slipping or crawling. As the hydraulic cylinder failure caused by the phenomenon of equipment downtime is not uncommon, therefore, should pay attention to the hydraulic cylinder fault diagnosis and use of maintenance work.

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First, the fault diagnosis and treatment

1.hydraulic cylinder malfunction or malfunction


The reasons and solutions are as follows:

(1) The spool is stuck or the valve hole is clogged. When the flow valve or directional valve spool stuck or the valve hole is blocked, the hydraulic cylinder prone to malfunction or malfunction. At this point should check the oil pollution; check dirt or gum sediment stuck valve plug or plug the valve hole; Check the body of the wear and tear.

(2) The piston rod is stuck with the cylinder or the cylinder is clogged. No matter how the manipulation at this time, the hydraulic cylinder is not action or action is minimal. Should check the piston and piston rod seal is too tight, whether to enter the dirt and plastic deposits: the piston rod and cylinder axis alignment, consumables and seals are invalid.

(3) hydraulic system control pressure is too low. Throttling resistance in the control line may be too large, the flow valve is not properly adjusted, the control pressure is not suitable, and the pressure source is disturbed. At this point, check the control pressure source to ensure that the pressure is adjusted to the system's specified value.

(4) into the hydraulic system of air. Mainly because there is a leak in the system. At this point should check the level of the hydraulic tank, hydraulic pump suction side of the seal and pipe joints, oil strainer is too dirty. If so, replenish the hydraulic oil, handle seals and fittings, clean or replace the coarse filter.

(5) hydraulic cylinder initial action is slow. In the case of lower temperature, hydraulic oil viscosity, poor fluidity, resulting in slow cylinder movement. The remedy is to replace the hydraulic oil with better viscosity-temperature performance and to heat the oil at startup by using a heater or by using the machine itself.


2.hydraulic cylinder work can not drive the load

The main performance of the piston rod is not allowed to stop, lack of thrust, the speed drop, unstable work, etc. The reason is that (1) hydraulic cylinder leakage. Cylinder internal leakage including hydraulic cylinder seal, piston rod and seal cover seal and piston seal are caused by excessive wear and tear and other leaks.


The reason why the piston rod and the sealing lid seal leaks is that the sealing ring is wrinkled, crushed, torn, worn, aged, deteriorated, deformed and the like, and new seals should be replaced at this time.


Excessive piston seal wear is mainly due to improper adjustment of the speed control valve, resulting in excessive back pressure and seal improper installation or hydraulic oil contamination. Followed by assembly of foreign bodies into the sealing material quality and poor. The consequences are slow movements, weakness, serious cases can also cause damage to the piston and cylinder, there "pull cylinder" phenomenon. Treatment is to adjust the speed control valve, control instructions should be made to do the necessary improvements and installation; cleaning filter or replace the filter, hydraulic oil.


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