I would ask your questions over on yesterdaystractors.com in the Case/David Brown section. There are some very experienced folks there.
Going to need more information. I'm assuming this is a power shift tractor. Will it restart and run with clutch pedal depressed? I would guess this is
a spool sticking in the valve body on top of the transmission. My experience is limited and I've not been around a 1370 enough to know if they are the same as the smaller tractors.