Is it the remote?

[fruitcakesa]

I finally mounted the top and tilt cylinders that have been sitting in my shop for years and to my dismay the tilt unit drops down after a few hours. I have used the tilt on my old 6040 and never had a drop down but on the latest tractor it does.
So my question is could the drop be a result of something in the remote valve and if so what could it be and is it fixable?

 

[zzvyb6]

Flip the couplers to see if there is a pressure relief valve in line.

 

[Gordon Gould]

Try this - Raise and lower tilt cylinder several times in case there is air in it. Then set your implement square. And set it on the ground so there is no force on the cylinder. Turn off tractor and operate tilt control to take the pressure out of the lines. Unplug your remote disconnects for the tilt. Start tractor and raise implement. If it stays level your valve is almost certainly the problem.

gg

 

[LouNY]

Many hydraulic valves will give a spec sheet on how much leakage they have. Also valves with built in pilot checks will usually hold better with less leak down.
The easier way would be to plumb a lock valve into the cylinder.
Either a two port;

Or actually you could get by with a single port;

A single plumbed into the cylinder lower port should stop the issue unless the cylinder is bypassing internally.