A hydraulic cylinder may look like a simple component, but some small details can have a significant impact on its operation and service life.
Today, we would like to introduce one of the larger hydraulic cylinders we use for hydraulic lifting equipment: the 110/90 hydraulic cylinder.
In this specification:
110 mm = cylinder barrel inner diameter
90 mm = piston/rod diameter
For large hydraulic cylinders, you will normally find a relatively large breather port on the cylinder. This port is not just an additional hole on the cylinder. It plays an important role in the normal operation and maintenance of the cylinder.
1. Always Open the Breather Port Before Operation
One important point that is sometimes overlooked during installation is the breather port.
Before the hydraulic cylinder is put into operation, the breather port should be properly opened according to the cylinder design.
If the breather port remains closed, the air inside the cylinder cannot move freely as the cylinder operates. This can affect the normal movement of the cylinder and may result in abnormal resistance, pressure buildup or other operating problems.
Therefore, when installing a large hydraulic cylinder, always check the breather port before commissioning.
Do not simply leave the breather port sealed because the cylinder looks complete.
2. Connect a Small Hose to the Breather Port
For lifting equipment, we normally recommend taking one additional step.
After opening the breather port, a small flexible hose can be connected to the port and routed back to the hydraulic oil tank, when the cylinder design allows this arrangement.
Why is this useful?
One reason is to keep the surrounding area cleaner.
If the cylinder seal experiences minor leakage during operation, hydraulic oil may otherwise come out through the breather area and spread around the equipment.
With a properly routed hose, the oil can be guided back toward the hydraulic oil tank instead of being discharged directly around the cylinder.
This provides a cleaner installation and makes the equipment easier to maintain.
Of course, the exact hose connection should always follow the cylinder manufacturer's design and maintenance requirements.
3. What If You Notice a Small Amount of Oil Around the Breather Area?
Another situation that can sometimes occur with a new or newly installed hydraulic cylinder is a small amount of oil appearing around the breather area.
This does not automatically mean that the cylinder has a serious problem.
In some cases, the sealing components inside the cylinder may not yet have ideal lubrication during the initial operating period.
If the cylinder is otherwise operating normally, a small amount of oil or slight seepage may gradually decrease as the sealing components become properly lubricated through operation.
However, if the leakage continues, increases, or becomes significant, the cylinder should be inspected rather than simply continuing to operate it.
Possible causes may include:
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Damaged or improperly installed seals
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Excessive seal friction
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Insufficient lubrication
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Contamination
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Rod surface problems
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Incorrect cylinder assembly
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Excessive side loading or misalignment
4. Lubrication Can Help During Initial Operation
For some cylinder designs, an appropriate lubricating oil may be introduced through the designated breather or lubrication port to improve lubrication of the internal sealing components.
A small oil can or suitable lubrication tool can be used for this purpose.
Important: The lubricant must be compatible with the cylinder seals and the manufacturer's maintenance requirements. Do not introduce an arbitrary oil into the cylinder without checking compatibility first.
Proper lubrication can reduce friction between the sealing components and the moving rod, helping the cylinder achieve smoother operation during the initial running period.
In some cases, minor seepage caused by insufficient initial lubrication may gradually disappear after the cylinder has operated for a period of time.
5. Do Not Ignore Continuous Leakage
It is important to distinguish between minor initial seepage and continuous hydraulic oil leakage.
If the oil leakage:
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Continues after normal running-in
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Becomes progressively worse
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Produces visible oil spray
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Causes hydraulic oil consumption
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Appears together with abnormal cylinder movement
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Is accompanied by unusual noise or vibration
then lubrication alone should not be considered the solution.
The cylinder should be stopped and inspected to determine whether the seals, rod, barrel, connections or hydraulic system have a problem.
For related hardware security best practices, see our article on Why Hydraulic Cylinder Pin Retaining Nuts Are Safer Than Cotter Pins in Lifting Equipment.
6. Small Details Make a Difference
The 110/90 hydraulic cylinder is a relatively large hydraulic actuator, but its reliable operation depends on more than just cylinder diameter and hydraulic pressure.
Small installation details—such as correctly handling the breather port, routing a suitable hose, checking lubrication and monitoring seal condition—can make a significant difference to the cleanliness, reliability and service life of the hydraulic lifting system.
At Beacon Industries, we pay attention not only to the lifting capacity and overall structure of hydraulic equipment, but also to the details of the hydraulic components used in the system.
A well-designed hydraulic system is not simply about making a platform go up and down.
It is about making the equipment operate smoothly, reliably and safely over the long term.
If you are looking for heavy-duty lifting solutions built around reliable hydraulic systems, explore our 5-Ton Double Scissor Lift.
Practical Checklist for a 110/90 Hydraulic Cylinder
Before commissioning, check:
☑ Confirm the cylinder specification: 110 mm barrel / 90 mm rod
☑ Check that the breather port is properly opened
☑ Consider routing a small hose back to the oil tank where appropriate
☑ Check the cylinder for abnormal oil leakage
☑ Confirm suitable lubrication according to the cylinder manufacturer's requirements
☑ Monitor the cylinder during initial operation
☑ Inspect the seals if leakage continues or increases
These simple checks can help prevent small installation issues from becoming larger maintenance problems.
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