Hi,
Yes, that is different from the units I've had experience with fried solenoids. Other pump models have the solenoid outside the pump body; I suppose for easier replacement when they go bad.
With those, it's a simple matter of unscrewing the solenoid coil, removing the spool, and putting the coil (which plugs the hole back up) back on. You can then start the machine and get it back to the barn.
Stopping it requires lowering the idle screw to the point it quits. You then have what amounts to an old fashioned pump where you have to lift the throttle lever to get the thing started, and can stop it by just bottoming out the lever.
This is supposed to be a 'temporary measure', meaning one gets a new coil ASAP and then puts everything back to 'normal'. I've seen many a machine where this became a 'permanent situation', including that 68 JD350 I once had. I got it with this 'temporary measure' in place, and left it that way, actually!
This pump you have really needs to have a proper repair done to it. I'd not want to pop the cover and try the jury rig in the field. I'd remove the pump and get it fixed properly.
later!
Stan