RickB
Super Star Member
- Joined
- Sep 18, 2000
- Messages
- 15,143
- Location
- Up the road from Dollar General WNC
- Tractor
- Just a Scag
Does anyone know, are the big 3 brands designed the same way? The loopback hose is one solution. Are there others that can be designed in? Like may a valve that returns to neutral when dead head is sensed? Do they make a relief valve that can be put across the remotes?
I was told to watch for this and not to do it when my tractor was delivered. But, I can see how it would b easy to forget, or to accidentally engage it. It does make a pretty distinct whine when it dead heads. I'm always listening for unusual noises.
Open center hydraulic systems can and do damage pumps when pump flow is forced over relief at system pressure for extended periods. It makes no difference what color paint is on the tractor, or what the decals say. That is why many remote valves have no detents except for float. And also why pressure adjustable detents should only be set at or above relief pressure in special circumstances, and set "normally" when those circumstances end.
I have no idea what happened in this case and will not speculate. If there were no relief valve in the system at all, the damage would have been immediate and probably more catastrophic. Something along the lines of a split pump housing or blown connection.