I've seen a couple of odd ball things cause seals to blow out- excessive temps- How hot does the oil get in this cyl compared to the other cyl's?, Environment- How is the surface this unit rides on- smooth or moderately bumpy? Tires- same as enviroment. Operator- is he/she constantly "bumping" the hoist cyl up & down rather than smoothly operating the hoist.
This is ONLY to be used to report flooding, spam, advertising and problematic (harassing, abusive or crude) posts.