As a key execution element in the hydraulic system, hydraulic cylinders are widely used in various mechanical equipment. However, due to the complexity of the working environment, load changes, and long-term use, hydraulic cylinders may experience a variety of failures. The following are some common failure analyses and solutions.
Hydraulic Cylinders Cannot Act
Failure Causes
Hydraulic cylinders cannot move may be due to the following reasons:
- Hydraulic system pressure is insufficient
- Hydraulic cylinder internal leakage
- Hydraulic cylinder piston rod stuck
- Control valve failure
Solution
- Check the hydraulic system pressure to ensure that the pressure reaches the set value.
- Check hydraulic cylinder seals and replace damaged seals.
- Check whether the piston rod is bent or jammed, repair or replace if necessary.
- Check whether the control valve works properly, if necessary, replace the control valve.
Hydraulic Cylinders Move Slowly
Causes
Slow movement of the hydraulic cylinder may be due to the following reasons:
- Hydraulic oil viscosity is too high
- Hydraulic cylinder internal leakage
- Hydraulic system flow is insufficient
- Hydraulic cylinder load is too large
Solution
- Check the viscosity of the hydraulic oil, if necessary, replace the appropriate hydraulic oil.
- Check hydraulic cylinder seals and replace damaged seals.
- Check the flow rate of the hydraulic system to ensure that the flow rate reaches the set value.
- Check the hydraulic cylinder load, ensure that the load is within a reasonable range.
Hydraulic Cylinders Crawling Phenomenon
Fault Cause
Hydraulic cylinder crawling phenomenon may be due to the following reasons:
- Air in the hydraulic cylinder
- Hydraulic cylinder piston rod bent
- Improper installation of hydraulic cylinders
- Hydraulic oil contamination
Solution
- Remove the air in the hydraulic cylinder and make sure the hydraulic system is free of air.
- Check whether the piston rod is bent, repair or replace if necessary.
- Check the installation of the hydraulic cylinder to ensure that the installation is correct.
- Replace the contaminated hydraulic oil and clean the hydraulic system.
Hydraulic Cylinders Leakage
Cause of Failure
Hydraulic cylinder leakage may be due to the following reasons:
- Deteriorated or damaged seals
- Worn hydraulic cylinder block or piston rod
- Loose hydraulic cylinder connections
Solution
- Replace deteriorated or damaged seals.
- Check cylinder and piston rod for wear and repair or replace as necessary.
- Check hydraulic cylinder connections to ensure that they are tight.
Hydraulic Cylinders Noise
Causes
Rattling of the hydraulic cylinder may be due to the following reasons:
- Foreign matter in the hydraulic cylinder
- Hydraulic cylinder piston rod and guide sleeve clearance is too large
- Hydraulic cylinder load instability
Solution
- Remove the foreign matter in the hydraulic cylinder.
- Check the clearance between piston rod and guide sleeve, adjust or replace if necessary.
- Check the load of the hydraulic cylinder to ensure that the load is stable.