- Most hydraulic cylinder malfunctions occur when seals start to exhibit internal leakage. This is completely repairable in most cylinders; the cylinder most be taken apart and every seal replaced. A hydraulic cylinder rebuild kit contains all the seals and other expendable parts that need to be changed during an overhaul.
- Hydraulic seals come in several sizes and types---as do hydraulic cylinders---and a hydraulic cylinder will contain several different types and sizes of seals. As a result, it would be a huge task to try to repair a cylinder by matching individual seals in the cylinder to individual seals stocked in a tool room or supplied by an outside distributor.
- A cylinder rebuild kit won't fix all hydraulic cylinder problems. Bent rods, damaged cylinder barrels, gouged piston rods and corrosion are just some of the things that can cause a hydraulic cylinder to malfunction that cannot be rectified without repairing or replacing parts.
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