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If the diverter channels hydraulic flow away from the loader, what prevents the bucket from eventually bleeding down and scraping on the ground when the Top 'N Tilt is being used?
 

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I would imagine the hydraulic fluid already present on either side of the cylinder holds its position once the hydraulic circuit is closed off and redirected. Just a guess.
If it does, it would be the first JD SCUT/CUT tractor in history to do so. :)
 

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You have internal leakage around the piston seals, but that's usually pretty minimal unless they're worn or scored from dirty oil. You also have air that gets introduced from cavitation which can lead to sag and sponginess in the mechanism.


Hydraulics are not mechanical holding devices intended to support loads indefinitely. They have internal losses which are compensated for and otherwise simply accepted as part of the beast. I'm actually impressed with how long my rockshaft will support a load when not under power. My loader will leak down much faster.
The rockshaft on my 2720 will stay up for weeks even with a 300+ lb implement attached.

Like you, the loader is another story. Based on my own experience and from reading forum posts it seems the problem is much worse on newer JD SCUT/CUT tractors. Folks with older models (650, 750, etc.) report that their loader will stay in position a long time even after the engine is turned off. Whereas folks with newer tractors find they bleed down pretty fast. JD of course has their little bleed-down spreadsheet which clearly shows that the tolerances in their hydraulic components has gotten worse as the years progress.

When I was running a subsoiler back and forth in a field with the bucket slightly raised I was surprised just how often I need to hit the SCV lever to bump the loader back up into position.
 
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