Are you engaging the MMM at full PTO speed? If not it will kill the engine. Are you trying to engage a rear implement at full PTO speed that will kill the engine or shear the shear pin or both.
Hey Old Paint,
Shoot me a link to the diagram, or scan it and send it. I'll be happy to have a look and mark it up for you. That's why we use this forum, isn't it?
@TECH101 posted a photo of a page from the WSM that confirms what I figured. The OPC module is basically a relay with several inputs that solves all the logic for engine start/run permissive. I can't quite see all of the diagram that shows all the inputs, though. That's a pretty good description of the OPC's function, but it really doesn't describe all the logic built inside that little smart relay. I would think, though that if the clutch was released and the seat switch were bad, even without the PTO engaged it would kill the tractor, if the problem was just the seat switch and the OPC logic is what I think it should be. I need to know the logic of the OPC, or at least see the full diagram, and perhaps the operator's manual section that describes PTO operation. If this ONLY kills the engine with the PTO shift lever engaged, it's activating (or not) some other logic in the OPC.
