Recurring Hydraulic Leak on Front End Loader

[Bladerunner6]

I have a 2013 John Deere 5065E with a John Deere 553 Front End loader. My question has to do with a recurring hydraulic leak in the "blue" line of my 553 front end loader. The first time a leak occurred was while using the loader to compress mud in my farm road after heavy rains. I was using it to put downward pressure while dragging the bucket over the mud moving backwards with the tractor.

The cause of the leak was an "O" ring in the hydraulic line. When I pulled the line off and took the fitting apart, the O ring was crumpled and allowing a stream of hydraulic fluid to spurt from the line. I installed a new O ring and was using the tractor in the same manner compressing the mud/dirt and the leak recurred.

Does what I was doing with the bucket (compressing the mud) cause pressure buildup in the line to crumple the O ring? I thought that what I was doing was within the operating capability of the tractor/loader, but maybe I am just totally screwing up here in my thinking.

Is there another possibility that the O ring is failing? I may be installing the O ring wrong, but how can you screw that up? You just set the ring in the fitting and make sure its seated well.

 

[Zebrafive]

My only advice is to lube the O-Ring when you install it. I use Vaseline.
I once had a hose to metal line loosen. I think it was the up & down of the loader caused the hose to twist and it loosened the line. I do not tighten the fittings overly tight, might have been I did not get them tight enough?

 

[wolfpack2]

Is it possible you have a damaged or bad fitting? I would try swapping the male end with another circuit. If the problem follows the male end, replace it and repair the female side. If not replace the female connector.