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Central IL | What is it currently doing when you hit the SV1 button? It’s been quite a few years since I worked with these so my recollection may be a little fuzzy.
The tractor stores separate sv1 and sv2 speeds for rabbit and turtle mode so it matters which one you set your previous speeds for. It’s also important to never do any heavy work while in rabbit mode as that is hard on the transmission.
The wheel slip you messed with I believe only affects the tractor if using a 3 point implement. If the wheel slip gets over your threshold it will raise the hitch to get the desired ground speed and then re-lower if it can while maintaining speed below the slip threshold.
The underspeed supervisor essentially is how many RPMs the computer will let the engine drop before slowing the ground speed. So if it’s set too low every time you speed up on a higher load application, the engine pulls down which then causes the tractor to slow the speed to maintain engine rpm’s. I think we used to set that around 13-15%.
The other thing to check is that you can link engine speed a/b and the sv1/sv2 speeds. Unless you are running specific pro work or some hydraulic reasons I would virtually never recommend this. The tractor will prioritize engine rpm’s over ground speed so if they are linked and the tractor can’t achieve the sv1 ground speed at engine rpm’s A, the sv1 won’t actually engage and work.
After looking back at the previous thread your fifth picture shows sv1 is linked to engine speed A where is says “ON”, and the same for sv2/engine speed B. Not know what you are using the tractor for, or how it’s acting I’m guessing this could be your issue.
Hopefully some of this helps.
Edited by jvilleagger 5/12/2026 18:20
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Agco sv1 speed problem continued
