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Re: Universal diesel wont start when engine is hot!
Could also be that the starter had been abused. They get incredibly hot and the stator and coils expand during normal starting. If they overheat, they can also bind up from the expansion. (Had that on a car.)
If the starter is marginal, the additional heat from the running engine could keep it swollen up and that would make enough friction so it might turn slowly--but not fast enough to start the engine.
The simplest way to diagnose that, if you can access the starter without too much trouble, is to pull it, open it up, examine the wiring for grinding and other physical damage.