I have a Massey 180 diesel with a peculiar issue. I was having a fuel issue and working on bleeding the fuel lines. I was turning the tractor over several times while it was in neutral (both the high/low range and the gear shifter were in neutral). After turning the tractor over for the fifth or sixth time, the starter went "clunk" and wouldn't turn over the engine. It was as if the tractor was suddenly in gear, and the starter couldn't turn the flywheel. I initially thought that I smoked the starter, but I eventually figured out it wasn't a starter or battery connection issue. If the clutch is disengaged, the tractor will turn over and start fine. But if the clutch is disengaged, the starter won't turn the engine over. Moreover, when the tractor is running, if I begin to engage the clutch, the engine bogs down, but the tractor won't move (both shifters are still in neutral). It easily shifts into gear but still won't move and wants to stall if I start to engage the clutch. I haven't fully engaged the clutch because I'm afraid it is stuck between gears. But how could that have happened when no one touched the shifters, and I had just been turning the tractor over? More info is that the PTO engages and disengages fine (when running with the clutch disengaged). The tractor also has a multipower that is stuck in high (it has been that way since I got the tractor 2+ years ago). I'm a bit at a loss on how to tackle this other than messing with the shifters. Any thoughts? Thanks!