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What Causes the Hydraulic Cylinder to Lower Automatically?

2 Answers

MacGiselle

07/25/25 12:17am

Hydraulic cylinder automatic lowering may occur due to the following reasons: 1. Aging or wear of sealing rings: Timely redesign of the sealing structure or replacement of sealing rings is required. 2. Hydraulic valve leakage: Prompt replacement with a new hydraulic valve is necessary. 3. Oil seal damage: Gradual lowering of the hydraulic cylinder may also result from damage to the oil seal beneath the piston. When replacing, ensure to purchase only the original model; substitution with other models is not permissible. During assembly, cleanliness is crucial. All components of the hydraulic cylinder must not be cleaned with diesel, as this may accelerate damage or cause oil leakage. Instead, use gasoline for cleaning. After cleaning, wait until the gasoline has completely evaporated before assembly. Use hydraulic oil to lubricate the oil seal during assembly.

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VonAlexa

08/10/25 3:40pm

Seeing this question reminds me of the hydraulic equipment I've repaired. Hydraulic cylinder auto-descending is usually caused by sealing issues. When seals age or wear out over time, hydraulic fluid leaks through gaps, failing to maintain pressure, causing the cylinder to gradually sink. This is particularly common in excavators or forklifts - those old machines with poor sealing materials deteriorate even faster when combined with contaminated oil. Another major culprit is hydraulic circuit leaks, such as loose fittings or damaged hoses. If all the hydraulic oil leaks out, obviously it can't provide support. I've also encountered cases with scratched pistons or cracked cylinder barrels, which are much more troublesome to repair. Develop good habits: regularly check oil levels and cleanliness, change fluids on schedule, and never use inferior hydraulic oil. If descending is detected, shut down immediately to check for leaks - otherwise accidents may occur. Safety comes first - don't try to save pennies only to lose dollars. A professional technician can definitely fix it with proper inspection.

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