Double Acting Hydraulic Cylinder Troubleshooting
If you’re having trouble with a double-acting hydraulic cylinder, you’ve come to the right place. We’ll cover what to look for and what to do when the hydraulic cylinder stops working properly. In addition, we’ll discuss ways to troubleshoot the problem.
What is Double Acting Hydraulic Cylinder?
The working fluid in a double-acting hydraulic cylinder alternately acts on the piston’s left and right sides. There is a hole at one end of the cylinder for attaching the piston of the double-acting hydraulic cylinder to the external mechanism. The piston rod is connected to the cylinder through this hole, and a stuffing box is installed with the cylinder to stop working fluid from leaking. Its primary goal is to utilize a double-acting hydraulic cylinder’s piston to produce force in both directions. Ports for the retraction and extraction of the piston are located at both ends of these cylinders. The main benefit of a double-acting hydraulic cylinder is that the piston can move in either direction to retract or extract without the assistance of an external force. Pumping hydraulic fluid to both sides of the plunger is possible with double-acting hydraulic cylinders. The piston rod can travel forward and backward thanks to connection apertures close to both ends. The additional port guarantees that the plunger always returns to its starting location and gives the user more control during retraction.
Double-acting cylinders are a superior option for projects requiring repeatable accuracy due to their quicker and more predictable retractions.
What Separates the Single-Acting Hydraulic Cylinder from the Double-Acting Hydraulic Cylinder
The plunger extends when hydraulic fluid is injected into a single-acting hydraulic cylinder under high pressure. The plunger is either retracted by a return spring, a load, or only gravity to return the cylinder to its reset position. However, in a double-acting hydraulic cylinder, the plunger is forced back to its reset position when hydraulic fluid is delivered at high pressure into the top port of the cylinder. This operation can be carried out swiftly and progressively with excellent precision using the double-acting hydraulic cylinder.
Double-Acting Hydraulic Cylinder Advantages Include the Following:
Despite having a more complicated mechanism than a single-acting hydraulic cylinder, double-acting hydraulic cylinders are favored when a job calls for more precise functioning. Another benefit of using double-acting hydraulic cylinders is their quicker retracting mechanism, which is very helpful in occupations requiring repeating motions like Jack and Crib. In addition, the double-acting hydraulic cylinders are essential for controlled retractions.
Single-Acting Hydraulic Cylinder
Single-acting hydraulic cylinder troubleshoоting entails the diagnosis and correction of common fault conditions. Typical failures include no action of the cylinder or no oil. These symptoms may indicate a malfunctioning hydraulic pump or main hydraulic valve. In addition, the cylinder may be noisy or exhibit jerky movements.
The problem may be due to excessive friction, leaking, or inadequate lubrication. The cylinder may also be overheating. Hydraulic cylinders have a set temperature range, and they shouldn’t exceed this. But it could also be an indicator of a more severe issue. Besides, excessive heat can cause the cylinder to be judder.
A cylinder that won’t retract can result in significant downtime. Knowing what to look for can help you prevent problems and get back to work as quickly as possible. A single-acting hydraulic cylinder has an internal spring that uses the pressure of the hydraulic pump to extend the rod. The weight of the load then pulls the rod back into place. Single-acting cylinders are typically used for lifting applications in one direction.
Bleeding a cylinder is one of the most common single-acting hydraulic cylinder troubleshooting techniques. It involves removing pockets of air built up in the hydraulic cylinder’s chamber. Bleeding a cylinder properly is important to ensure it works in the best possible condition. Using a properly bled hydraulic cylinder can help you keep the machine working as it should, and it can prevent the need for costly repairs down the line.
Hydraulic cylinders can also develop problems relating to the amount of fluid in the cylinder. For example, the cylinder can become locked if there is too little fluid. Similarly, if too much hydraulic fluid is in the cylinder, it will become difficult to retract.
One of the first steps in troubleshooting a single-acting hydraulic cylinder is to check the solenoid valve. It is responsible for regulating the flow of hydraulic oil. This valve is located on the cylinder’s bore and rod end. If this valve is dirty, the hydraulic fluid will not be able to flow through the solenoid, which prevents the cylinder from being able to retract properly.
Once you’ve checked for leaks, the next step is to inspect the cylinder’s piston and rod. These components must be free of rust. You should also check for damage to the cylinder’s seals. If any of them are cracked, replace them. Compared to its double-acting sibling, the single-acting cylinder is easier to use. When there are fewer components, there are fewer potential problems, which is good news for maintenance.
Single-acting cylinders are best for simple tasks, especially where controlled or quick retraction is not required. For pulling purposes, hollow plunger versions with a thread are also available.
Ways to Troubleshoot a Double-Acting Hydraulic Cylinder
If your hydraulic cylinder is leaking, there are a few ways to troubleshoot it:
- You should remove it from the service and strip it completely.
- You should measure and clean the cylinder parts.
- Make sure all the parts are in good condition so you can try to repair the cylinder.
A pressure gauge is a good tool to use for this. You can also check the cylinder’s drift. The drift is caused by unequal pressure across the piston. If the pressure gauge indicates a 0.2-mm difference, the cylinder is not operating properly.
Another way to test a hydraulic cylinder is to bleed using the air. This can be done manually or with an air compressor. However, you should be aware that this may cause a buildup of pressure in the cylinder. The cylinder will take longer to bleed if the air pressure is too high.
When the cylinder’s performance drops, you must make sure that it is lubricated and fitted correctly. This will help minimize the possibility of leaks. Also, it is important to prepare yourself with spare parts. Finally, always read up on how to maintain your hydraulic cylinder.
If you are not sure about the cause of the problem, consult your technician. Most hydraulic cylinders have internal problems that can be repaired or replaced. However, you may need to replace the entire cylinder or rebuild it. In the end, it is important to understand the exact nature of the problem before attempting a repair.
Bleeding the cylinder can also be a simple way to check whether your hydraulic system is working properly. Bleeding the hydraulic system will remove any air pockets. If you don’t do this, you could cause catastrophic damage to your system.
Many common issues affect a hydraulic cylinder, but knowing what to look for will help you avoid them and minimize your downtime. For example, insufficient fluid in the cylinder will result in a hydraulic lockup, which can lead to serious damage. The best way to prevent this is to check the fluid levels in the cylinder regularly.
If you hear a banging or knocking noise coming from the hydraulic cylinder, you may have a cavitation problem. This occurs when air enters the pump’s intake. When the air gets trapped inside the cylinder, it creates air bubbles. This is very dangerous for your cylinder because it can lead to overheating. It also results in the loss of lubrication and seals. In addition, you should check the cylinder for jerky movements. If the movement is irregular, you should replace the intake lines.
How do you bleed air from a double-acting hydraulic cylinder?
To let the air out, open the top bleed valve. Keep it open until the hydraulic fluid flowing freely from the valve. This suggests that all of the air has been expelled. If the fluid is frothy, run it through some gauze or, failing that, add fresh hydraulic fluid to the system.
How do you test a double-acting cylinder?
In a double-acting cylinder, the piston seal is typically tested for integrity by pressurising the cylinder at the conclusion of the stroke and measuring any leakage past the seal. This procedure is known as “the end-of-stroke bypass test.”
What causes a hydraulic cylinder not to move?
Cylinders might get hydraulically stuck and unable to fully retract or extend when your hydraulic system is low on fluid. Worn seals may make it difficult to retract hydraulic cylinders because of misalignment problems between the seal and cylinder rod. It is simple to prevent these problems.
Why does hydraulic cylinder not hold pressure?
As a result of pressure equalisation around the piston, the rod seal leaks, causing the cylinder to become hydraulically locked. Because the cylinder is unable to support a load in the middle of the stroke, this imbalance leads it to drift toward either the extend or retract position.