Why Does Seal Failure Occur in Hydraulic Cylinders? The 7 Most Common Reasons
Why Does Seal Failure Occur in Hydraulic Cylinders? The 7 Most Common Reasons
Why Does Seal Failure Occur in Hydraulic Cylinders? The 7 Most Common Reasons
Most of the malfunctions in hydraulic systems are caused by gasket and seal problems that may seem minor at first glance. Seal failures, especially in hydraulic cylinders operating under high pressure; It can lead to oil leaks, loss of performance, and serious system damage.
So why do hydraulic cylinder seals fail?
In this article, we examine the most common causes of seal failure in the field and how to prevent these problems from a technical perspective.
- Dirty Hydraulic Oil Handling
One of the biggest causes of seal failures is oil contamination.
Entered into the system:
Metal particles, dust, dirt, water and damage to the felt surface.
Conclusion:
Premature wear, surface scratches, oil leaks
This problem is very common, especially in systems where filter maintenance is neglected.
- Overpressure
Exceeding the working pressure of the cylinder puts much more strain on the seal system than usual.
Conclusion:
Deformation of the felt, coming out of its socket, sudden explosion
Pressure control is critical in high-tonnage systems.
- Wrong Seal Selection
Not every hydraulic system uses the same seal.
False:
Material, hardness, temperature resistance, if selected, the life of the felt is seriously reduced.
Example:
In systems operating at high temperatures, standard NBR seals can harden in a short time.
- Shaft Surface Damages
Scratches or surface defects on the piston rod constantly wear down the seal.
Why does it occur?
External impacts, rust, improper grinding operations
Conclusion:
Constant oil leakage, recurring failures in a short time.
- Improper Assembly
Even small mistakes made during felt installation can lead to major problems.
Common mistakes:
Forced installation of the felt, installation in the wrong direction, cutting during assembly.
This may cause leakage in some systems even at the first start-up.
- Extreme Temperature
High oil temperature:
It can cause hardening of the felt, loss of elasticity, cracking.
This problem is especially common in hydraulic power units with insufficient cooling systems.
- Side Load Problems
If the cylinder operates off-axis, an uneven load is placed on the seal.
Conclusion:
One-sided wear, uneven leaks, shaft and bearing damage
This problem is usually caused by improper mechanical alignment.
Real Field Example
A heavy-duty hydraulic press system was experiencing constant seal failure.
In the examination:
Seals were changed regularly, the pressure was at a normal level
However, in the detailed check:
Micro scratches were detected on the piston rod.
After the spindle was ground, the system continued to operate smoothly.
What Should Be Done to Prevent Seal Failures?
Regular oil analysis should be done
Filters should be changed periodically
The right felt should be chosen
Shaft surfaces should be checked
Pressure values should be monitored
Installation should be done professionally
Although seal failures in hydraulic cylinders may seem like a minor problem, they can turn into major system damage if not addressed in time.
With proper maintenance, proper material selection, and proper engineering practices, seal life can be significantly increased.