Forklift maintenance manual: cylinder fault diagnosis and troubleshooting

Oil leakage from forklifts is a common problem that plagues users, whether electric, internal combustion or manual forklifts, they may encounter the problem of oil leakage in the hydraulic system. Don't worry, this article will take you to an in-depth understanding of forklift cylinder failures to help you solve the problem!

First, find the clues of cylinder failure

During the use of forklifts, you need to be alert to cylinder failure if the following situations occur:

Abnormal lifting of forklift: The lifting speed is slow, unstable or accompanied by abnormal noise.

Forklift oil leakage: Hydraulic oil leakage and oil stains.

Forklift fluid abnormality: Foam or bubbles in the hydraulic fluid.

Forklift Component Damage: Significant damage to the cylinder piston rod.

Problems should be dealt with in a timely manner to avoid the expansion of faults.

Second, the cylinder troubleshooting steps

Cylinder check connections: Carefully observe whether there is looseness or oil leakage at the connections of the cylinders.

Cylinder to observe the condition of the oil: Check whether the hydraulic oil is clean and free of impurities or deterioration.

Cylinder inspection piston rod: Check the piston rod surface for damage such as wear, scratches, or corrosion.

Cylinder Measurement System Pressure: Use a pressure gauge to measure whether the pressure of the hydraulic system is within the normal range.

3. Common cylinder failures and maintenance methods

1. Lifting cylinder failure

Fault phenomenon: the piston rod automatically descends, the piston rod of the two lifting cylinders is not synchronized, the hydraulic oil leaks during the piston rod lifting, and the piston rod shakes when lifting.

Cause analysis: The piston seal is not sealed, resulting in a pressure drop; Oil leakage due to damage to the seal or wiper ring; There is air in the line or there is not enough hydraulic oil causing jitter.

Solution: Replace the sealing ring and dust ring; Exhaust the air at the front of the piston; Add enough hydraulic fluid.

2. Tilt cylinder failure

Cylinder failure phenomenon: The piston rod automatically stretches out (the mast automatically tilts forward), the hydraulic oil leaks when the piston rod is extended, and the piston rod shakes when it leans back.

Cause analysis: the piston seal ring is not sealed or the hydraulic oil is insufficient; The sealing ring and dust ring in the guide sleeve are not sealed.

Solution: Replace the sealing ring and dust ring; Add enough hydraulic fluid.

Fourth, maintenance precautions

When replacing the sealing ring, pay attention to choosing the appropriate model and material, and use special tools for installation.

When discharging air, pay attention to safety to avoid scalding caused by high-temperature hydraulic oil splashing.

When adding hydraulic oil, pay attention to the type and cleanliness of the oil to avoid contaminating the hydraulic system.

5. Prevention is better than maintenance

Regularly inspect and maintain the hydraulic system of forklifts, and replace aging or damaged oil seals, sealing rings and other components in a timely manner.

Use hydraulic fluids that meet standards and change them regularly.

Operate the forklift correctly to avoid overloading or improper operation causing impact on the hydraulic system.

Through the above steps and methods, I believe you have a deeper understanding of the diagnosis and troubleshooting of forklift cylinder faults.