Hydraulic Motor

WARRIORWELDING said:
I had a hydraulic circuit in a trash compactor give an entire team fits. All three shifts had opinions tried options and all of us were failing.
What we knew was the cylinder catastrophically failed and sent the welded cap to the ceiling. What we knew was after rebuild and installing we had a multitude of symptoms ranging from cavitation, surging, no flow, perfect flow and anything else you could think up. We had dang near replaced disassembled and adjusted everything except the cylinder.
I got slated for tear down. Taking one off the hoses I happened to glance into the fitting. Just inside the crimp was a larger piece of rubber. Curiosity and a crap ton of tugging with the help of a vice yielded a oring sized to fit the ram cylinder. Whole, not cut, not nicked and in a hose that meant it had to have traveld through nearly the entire circuit. It was nearly the diameter of the id of the hose and folded flat.

Put it back together and it was finally fixed.
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flush the damn lines if there is a failure in any part it will trash the lines. 100 micron magnafine filters are also a worthy addition to any auxiliary attachments return line
 
jeepinmatt said:
Sounds like something is going on with that valve and once the pressure gets high enough to open it, it is just bypassing all the flow. Will it allow you to spin the blades in either direction, and is the behavior the same in both directions?
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It only spins with flow in one direction. To spin it the other way, I would have to switch the check valve around.
 
jeepinmatt said:
Can you hook the lines straight to the motor and see what happens, or take out the check valve and plug the lines?
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Will probably have to plug the lines. Don't think I have enough slack to the motor. I'll give it a try when I get it back home.
 
got a schematic?
 
I forgot, I did take a picture that shows the hoses when I was trying it out before taking it to the job. They run straight from the machines quick attach fittings to the hydraulic motor on the cutter, with the check valve plumbed in near the motor.
PXL_20250810_182150404.MP.jpg
PXL_20250810_232049934.jpg
 
Jeff B said:
both. so I can look to see where the oil is going.
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It will take me a bit to get the schematics for the svl. I only have them in hard copies and they are somewhere in on of my storage trailers. I'll post them up as soon as I find them. Thank you
 
If you can spend $8k on a cutter, just spend hundred bucks or whatever on another valve and see if it solves the problem. Sounds like the valve bypassing as the pressure and flow goes up.
 
But I am planning to buy a new check valve. I'm heading up in the AM to work on the septic field and I'll get the model number off the valve then.
 
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