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JOHN DEERE 520 FRONT END LOADER HYDRAULIC CYLINDER REPLACEMENTS

6.6K views 6 replies 4 participants last post by  rwmeyer  
Looking at partscatalog, these cylinders are rebuildable for about $65 per cylinder. Do you have physical damage, like a bent rod or ??, or simply leaking? Bob
 
Only 2 things can go wrong with the rod: bent, and you'll see that quickly, or severely worn. Extend rod fully and visually inspect for worn areas or nicks, scratches, dents. These will destroy a new seal quickly! Another possibility is that whoever rebuilt cylinder installed wrong seal or installed seal backwards. That pretty much covers external leaks. Problems with internal are similar but cylinder needs to be dismantled to inspect.

If you truly do NOT want to use the cylinder as is, I'd remove and inspect. You may have to replace $10 worth of seals or the entire cylinder, but until you inspect, you don't know which. Bob
 
Another thought! Is this an external leak or an internal leak? If internal, bucket will drift down in a certain amount of time. If it drifts 2 or 3 inches in 5 minutes, that's an issue! If it drifts 2 or 3 inches in a week, that's kinda normal.

If no external oil is visible near rod seal(s), check lines & fittings back to tractor for signs of external oil. If possible, disconnect lines from loader to tractor and swap so what was lift/lower is now curl/dump and bucket lever now controls raise/lower. If problem "moves" to now raise/lower lever, problem is in valve, or possibly piping from valve to loader. Bob