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Hennepin, IL | Got a new Trimble valve and manifold on a 9R that isn't ATR that's giving me fits. Valve p/n is 67040S, it's a newer # and a different manufacturer than the other valves I've seen (Altos, Atos, something like that instead of Parker). Manifold appears the same, but forgot to double check the p/n. I've done about all I can think of on the controller side short of swapping a different Nav which I'll probably do in the morning just to say I did. I've done numerous P gain cals, dead band cals, and eventually just fiddled with the p gain manually. Best I could do is setting the p gain to 11 which is what the profile has set (also reset and loaded the profile multiple times), do the dead band cal, then set aggressiveness nearly all the way up. Even doing that it still wants to what I would call wander, but its not lazy. I'm not real sure how to describe it. Never gets more than about an inch offline and just constantly steers back and forth. I can mess with aggressiveness and get it acceptable until I change speed then it's bad again.
Here's where I need a hydraulic expert. I teed a pressure gauge into the pressure line at the valve and ran the gauge up to where I could watch it. Standby pressure is right about 500 and will run up between 1000 and 2000 depending how fast it steers. Steering wheel and valve make it respond nearly identical. Steering on a line it usually stays around 1000 but as soon as the valve "relaxes" it instantly goes back to 500. That's where it seemed like I had the best luck was setting it aggressive and making it make small, fast adjustments to what I'll call "keep the pump spooled" (it's actually a priority valve, hence the quotes). As soon as it gets straight enough on the line for pressure to drop to standby, that's when it'll start steering more erratic. I'll attach a pic of the dead band cal summary with the p gain set to 11. The servo delay small signal is way high which goes right along with my theory about spooling the pump and no matter how high I ran the gain, I couldn't get that number down very far and my overshoot went up dramatically. I'm wondering if I've got an issue with the priority valve, I just don't know where to start. Should the standby be 500 or should it be higher like 7-800? Because it seems like that would make a huge difference. My other thought is its letting the load sense bleed off too fast for whatever reason. I also did check the pump and it appears fine. Stuck a gauge on a remote, deadheaded it, and it pegged the 3000 psi gauge. Deadheading said remote doesn't affect the gauge at the valve at all.
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 20241115_193836 (full).jpg (230KB - 2 downloads)
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Any steering valve experts? Trimble or otherwise
