3pt doesn't stay raised after engine is shut off

[ovrszd]

So, if your cyl seals ever leak, where do you think the fluid will go?

It will dump back into the system sump, which is the rear axle housing.

 

[cormier]

Are you really saying that bypass fluid from a worn piston seal can not leak into the crankcase?

I sure thought that must all 3pt internal cyl's backsides were open to the sump.

If a piston seal is perfect, the only way fluid can get back to the sump is through the descent valve, or a bad valve spool, and yes, it will block the fluid if you want for transport.

It is also used as a variable descent device.

If you close off the descent valve, you close off the 3pt valve as being the problem.

Didn't think before i posted that, you are right about the single acting cylinder. First thing that came came to mind was about double acting but most 3pt have single acting. Good catch haha