How to Identify and Fix Common Gardening Problems ?
We provide a variety of viewpoints on how to identify and fix common gardening problems. Our sources include academic articles, blog posts, and personal essays from experienced gardeners :
Worn or Damaged Piston Seals
Having insufficient hydraulic fluid in your system causes cylinders to become hydraulically locked and unable to fully retract or extend. Worn seals can also cause misalignment issues between the seal and cylinder rod, which may cause trouble when retracting hydraulic cylinders.
The cylinder becomes hydraulically locked when the rod seal leaks due to pressure around the piston equalizing. It`s this imbalance that causes the cylinder to drift towards either the extend or retract position, unable to hold a load at mid-stroke position.
But the most common type of single-acting cylinder uses a return spring. In this version, pressurized fluid enters the cap end of the cylinder to extend the piston rod. When fluid is allowed to flow out of the cap end, the return spring exerts force on the piston rod to retract it.
To retract the piston, a single acting hydraulic cylinder must rely on an external force to expunge the fluid inside. This can be left to gravity if there is no immediate need to retract the piston, but a second piston can also be used to forcefully push the piston back into the cylinder.
Therefore, they won`t fly down like they fly up without a load and can even get stuck so they won`t move down at all. Try this: Spray the top of the cylinders with a good penetrating oil, and let it soak a few hours. Work the cylinder up and down. The penetrating oil will usually do the trick.
If it is sticking, gritty, or stuck, spray the internal components of the valve with WD40 and/or compressed air to dislodge the debris. Clean the valve, then lubricate with fresh hydraulic oil. Reinstall the solenoid onto the valve and energize to confirm functionality.
When air is present in a hydraulic system, the desired instant system reaction is slowed and results in a slower actuator response or a “spongy feel.” This is due to the compressible nature of the trapped air. The air contained in a system is alternately compressed and decompressed as the actuator is cycled.
Air and water contamination are the leading causes of hydraulic failure, accounting for 80 to 90% of hydraulic failures. Faulty pumps, system breaches or temperature issues often cause both types of contamination.
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