Went to use my brothers 720 diesel this weekend, and the thing wouldnt idle below 1000 rpm... but would wind way over rated speed. I did some adjusting on the throttle linkage and got the idle down to about 800, but now it wont start unless you bump the throttle ahead a bit. This tractor ran PERFECT on Wednesday. Beginning to think I either threw a weight in the governor or broke a spring. I have done plenty of gas tractor governors but never tore into a diesel one. Has anyone else ever dealt with this? My shop manual is inconveniently setting on the platform of the tractor in my brothers shed... in another state. Can anyone post a parts breakdown and point me in the right direction? Thanks!