How To Repair Hydraulic Cylinder Rod | Which is Stuck and Bend Due to the Hitting of Heavy Stone

How To Repair Hydraulic Cylinder Rod which is Stuck and Bent Due to the Hitting of Heavy Stone

Hydraulic cylinder bent rods caused by side load and hitting to Heavy large size objects can be a big problem when equipment starts to fail. Side loads occur when unequal pressure isn’t centered on the piston rod. They are the most common cause of failure of hydraulic cylinders that would typically last for years. The strain they cause can lead to many problems, including bent tubes, seal failure, piston rod wear, and in extreme cases bending of the rod. Side loads can also damage the rod bearings, put excessive wear on the push rod washer as well as on one side of the cylinder bore.
As these problems worsen, they lead to inefficient operation and eventual failure of the hydraulic cylinders. Luckily, there are ways to prevent hydraulic cylinder bent rods caused by side loading and one of them you'll see in our video!
Checking rod straightness is an essential task when repairing any hydraulic cylinder. Because if a bent rod gets put back in, the life of the rod seal is compromised.
Rod straightness should always be checked when a hydraulic cylinder is being re-sealed or repaired. This is done by placing the rod on rollers and measuring the run-out with a dial gauge . Position the rod so that the distance between the rollers (L) is as large as possible and measure the run-out at the mid-point between the rollers (L/2).
The rod should be as straight as possible, but a run-out of 0.5 millimeters per linear meter of rod is generally considered acceptable. To calculate maximum, permissible run-out (measured at L/2) use the formula:
Run-out max. (mm) = 0.5xL/1000
Where: L equals distance between rollers in millimeters.
For example, if the distance between the rollers was 1.2 meters, then the maximum, allowable run-out measured at L/2 would be given by 0.5 x 1200 / 1000 = 0.6mm.
In most cases, bent rods can be straightened in a press. It is sometimes possible to straighten hydraulic cylinder rods without damaging the hard-chrome plating, however if the chrome is damaged, the rod must be either re-chromed or replaced.
If a rod is bent, then it is wise to check actual rod loading against permissible rod loading based on the cylinder's mounting arrangement and the tensile strength of the rod material. of Industrial. If actual road load exceeds permissible load then a new rod should be manufactured from higher tensile material and/or the rod diameter increased to prevent the rod from bending in service.
In this video you will see a complete process of repairing a bent hydraulic rod by pakistani artisans,
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