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Diagnosing Common Indirect Hydraulic Cylinder Issues

Hydraulic systems can experience performance degradation over time. Learn how to troubleshoot common, indirect issues related to the hydraulic cylinder.

Olivia Yates
March 31st, 2026
(Modified: April 20, 2026)
Cylinders

Modern hydraulic cylinders are engineered with longevity in mind, but indirect hydraulic cylinder issues can still occur over time. As with all mechanical devices, parts slowly deteriorate until they eventually need to be replaced. In many cases, there will be obvious signs that a cylinder needs immediate repair, but issues can also develop slowly, making them easier to overlook.

Many people who work with or are close to hydraulic cylinders can often sense when the system isn’t working as it used to, but may struggle to explain what has actually changed. In such cases, the best thing you can do is carry out a thorough evaluation of your system.

There are a few common issues that occur in the lifetime of a hydraulic cylinder that can cause system-wide performance degradation.

In this article, we’ll highlight common (indirect) hydraulic cylinder issues, how to troubleshoot each one, and when it’s necessary to call a professional.

Relief Valve Cycling Frequently

If the pressure relief valve is cycling frequently, there is either a fault in the valve itself or a problem developing in the cylinder.

If it’s a fault in the valve itself, it’s usually due to an incorrect setting, wear, or contamination in the hydraulic fluid. If it’s the cylinder, it may be temporarily exceeding the expected pressure during operation, or there may be an internal leak allowing fluid to bypass the piston seals.

Troubleshooting

Start by verifying the actual pressure in the system and comparing it with the design limits and valve settings.
If the pressure is correct, look at when, in the cycle, the relief valve operates. If it’s occurring at the end of each stroke, it’s likely the cylinder is experiencing a form of shock loading. If it’s happening throughout the cycle, this can indicate leaks or air in the system, or a sticking valve.

When to Seek a Professional

If fluid pressures are good, there are no unexpected obstructions to rod movement, the valve is set correctly, and the fluid is clean, the problem is probably in the cylinder. In this case, request an evaluation from an expert.

Blistering on the Cylinder Barrel

Blistering is more commonly seen on hydraulic hoses but can also occur on the barrel itself, usually indicating overheating. If the cylinder is located near a heat source, such as a furnace or exhaust, move it or, if that’s not possible, install a thermal barrier.

If the cylinder isn’t near a heat source, the issue could be:

Internal bypass (worn piston seals)
Cavitation collapse inside the cylinder
Operating above the cylinder’s maximum temperature

Troubleshooting

Use a thermal camera to determine whether the entire system is running hot or if it’s just the cylinder.
If the cylinder is the only component running hot, listen for a rattling or grinding sound, which indicates cavitation. If present, that suggests too little fluid is being supplied.
If there’s no cavitation, internal leaks around the piston are a likely cause.

When to Seek a Professional

If the cylinder is hot enough to blister paint, a serious problem is developing. After eliminating cavitation as a possible cause, bring in a cylinder specialist to dig deeper.

Fluctuating Pressure

Erratic rod movement and difficulty holding position indicate pressure fluctuations inside the cylinder. Common causes for this are:

Internal cylinder bypass
Gas or air in fluid
Chattering relief valve
Cold startups

Troubleshooting

Identify when in the cycle the problem becomes apparent. Jerky motion is probably air in the fluid, while an inability to hold position is due to internal leakage. Stick-slip friction is another possibility.
Cold startups can be a problem because the fluid is more viscous. If the problem goes away as the temperature rises, check whether the correct fluid is being used. All fluids are viscous at cold temperatures, but the viscosity index of the fluid should be appropriate for the operating environment.
If foam or bubbles are present in the reservoir, the fluid should be changed.

Internal leaks can be difficult to diagnose without specialist expertise. Relief valve problems should be investigated as discussed previously.

When to Seek a Professional

Air contamination and viscosity-related problems can be difficult to solve. A cylinder expert will almost certainly get to a solution faster than a less experienced technician.

Internal leaks are also difficult to diagnose and may require partial or complete disassembly. Again, an experienced professional will get the work done faster.

Longer Cycle Times

People working with or close to a hydraulic cylinder are often the first to notice that it isn’t moving as quickly as it used to. Possible causes include:

The cylinder is laboring through the stroke instead of moving freely
Fluid viscosity is too high
Internal bypass is diverting flow past the piston
Contaminated fluid or scored components

Troubleshooting

Check the system pressure to eliminate the pump as the problem.
Check for load alignment because directional forces can increase internal friction and cause wear.

The other possible causes will benefit from expert attention.

When to Seek a Professional

A hydraulic systems expert can test fluids and identify viscosity and contamination problems. They can also identify any internal bypass or related issues that are slowing fluid delivery and reducing pressure.

Scoring may appear on the rod, but cannot be detected in the bore without disassembly. An experienced technician can do this faster and more precisely than someone unfamiliar with cylinders.

Frequent Need to Re-Adjust or Re-Position Loads

When a cylinder is properly sized and installed, you shouldn’t need to make frequent adjustments. If attention is needed even just a few times a month, that’s a clear sign that something is wrong.

Common reasons for making adjustments include:

Improperly sized cylinder
Flexing or bending cylinder rod
Drifting
External leaks
Worn or damaged valves

Troubleshooting

Start by assessing if the cylinder is correct for the application. If not, contact a specialist like Yates Cylinders to determine better options.
If the cylinder is application-appropriate, look to see whether the rod is bowing. Bowing can occur if the load is not properly aligned, especially on longer extensions. If the load is imbalanced or unevenly applied, make changes to resolve the problem.
If a cylinder is drifting, determine if the problem is in the cylinder or elsewhere. Apply pressure, then shut off the cylinder (using valves), and see if it still drifts. If it does, the problem might be a worn piston seal or a scored bore.
External leaks, as from a worn rod seal, can usually be spotted during inspection. Thorough cleaning might be needed before operating the system.

Valve problems can be very difficult to diagnose and require professional attention.

When to Seek a Professional

Drift and frequent readjustment problems usually require extensive cylinder knowledge and familiarity with repair techniques. Reaching out to a cylinder repair specialist will almost always ensure a faster, more durable solution.

Schedule a Professional Evaluation

If your in-house technicians don’t have experience troubleshooting hydraulic cylinder issues, ask for professional assistance. Calling in an expert is almost certainly less expensive than the downtime, equipment damage, and possible injuries resulting from system failure.

Founded in 1972, Yates Cylinders is a world-class hydraulic cylinder manufacturer that not only engineers durable, heavy-duty solutions but also offers standard and emergency repairs for tie rod, welded, mill-duty, hydraulic, and pneumatic cylinders.

If you have hydraulic cylinders that aren’t performing correctly or as they once did, and you’ve done all the troubleshooting you can, contact us today to get started with an evaluation.