JD 9500 Separator Not Disengaging!!
First off, I usually work on light to medium duty cars and trucks. This is a little out of the usual for me. I'm trying to help a friend fix his JD 9500. I think it's a 1991.
The problem he is having is the whole back of the machine (seperator, auger, threshing drum) won't disengage when the switch in the cab is flipped off. The only things not spinning are the header and spreader on the back. It puts a giant strain on the engine during startup, and when its shut down, it shakes violently from the main drive belt jumping on the pulley. I'm guessing the engine stopping so suddenly, and all the momentum from everything still turning in the back makes it do that. Shouldn't there be some kind of safety interlock that prevents the processing part of the machine from running during startup/shutdown?
How is the seperator drive belt controlled? The header has an electromagnetic clutch. Is there somehting similar? There's a large pulley with a hydrauic line coming out of it that goes to a valve on the opposite side. Is this some type of hydraulic clutch or am I looking at the wrong part?
I did notice that the relay in the circuit breaker box does click when the switch is flipped, so I know the controls are good.