Hydraulic cylinder seals fail for a number of reasons, from just being worn out to bad specs and misuse. Regular leakage can be caused by a range of issues, the most common of which on new cylinders is incorrect fitting of the hydraulic seals.
An unfortunately common mistake when ordering hydraulic seal kits for replacing seals is using measurements from the old seals. There are a number of reasons why this is not the way to go.
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