How To Repair and Rebuild a Hydraulic Cylinder

Hydraulic cylinder

Hydraulic equipment is widely used in construction, manufacturing and agriculture. Some heavy equipment that uses hydraulics and needs hydraulic repair and rebuilding are bulldozers, tractors, cranes, loaders, and elevators.

To ensure that a hydraulic system produces the power with the right versatility and precise control, every hydraulic system depends on the proper functioning of the hydraulic cylinder. Whoever handles a hydraulic system must have the essential skills to repair and rebuild a hydraulic cylinder to save on loss and delays in operations. The right skills and knowledge are needed to at least handle major problems in repairing and rebuilding hydraulic cylinders, including hydraulic motors, hydraulic rams, and hydraulic valves.

Before dealing with any repair, first make sure you have a clear understanding and knowledge of the components of a hydraulic system and the functions of its parts. Carefully read the instruction manuals provided by the manufacturers.

Below are some common problems you can initially troubleshoot and the steps to follow:

The hydraulic cylinder shaft seal is broken.

  1. Order from the manufacturing company that supplied your hydraulic cylinder the standard repair kit with spare seals, spare cylinders, and other spare parts matching the type and number of cylinders in your hydraulic machine.
  2. You will need to replace the broken seal by opening the cylinder assembly. Use the diagram provided as your guide.
  3. Locate the position of the broken seal that is usually found on one end around the shaft.
  4. Access the shaft entry by unscrewing the lid.
  5. Release hydraulic pressure in the chambers by loosening the pipes that inject the hydraulic fluid into the chambers.
  6. Remove the shaft, handling it carefully and taking care not to scratch it.
  7. Detach the piston from the cylinder shaft.
  8. Replace the shaft seal with a spare provided in the purchased repair kit.
  9. Properly align the seal.
  10. Make sure to oil all the parts after fitting.
  11. Reassemble all the parts in reverse order using the diagram as a guide.

The cylinder piston rings show damage.

  1. Determine the kind of cylinder arrangement your machine has using the manual provided.
  2. If your machine has a multiple cylinder arrangement, seek consultation from a qualified technician.
  3. If you have a simple cylinder arrangement, the damaged piston rings can be replaced.
  4. Follow the disassembling procedure indicated in your manual.
  5. Carefully remove and replace the damaged cylinder piston rings.
  6. Oil the cylinder assembly and rings before reassembling the cylinder.

The hydraulic cylinder piston rod is bent or there is a crack on the cylinder barrel.

  1. Check all the parts of your hydraulic cylinder to determine the extent of the problem.
  2. Repair cannot be done for bent piston rods or cracked hydraulic cylinders.
  3. Do not attempt to straighten a bent piston rod. Replace it.
  4. Automatically replace a cracked cylinder barrel.
  5. Follow the provided instructions in the manual to replace a piston rod or cracked cylinder.

Enhancing skills in hydraulic repair and rebuilding is advantageous for anyone interested in hydraulic equipment and machines, hydraulic motors, hydraulic rams, and hydraulic valves. It helps to study the machines causative framework, assembly, and components, making use of the diagrams provided, before doing any repair. Make the appropriate calculations in cost of repair compared to replacements to best solve any mechanical problem.


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