A pump with a worn head & rotor assembly will usually result in a tractor that starts fine cold but will NOT start when hot (not the converse).
An engine with poor compression do to cylinder/piston area wear will start poorly cold and BETTER hot.
Going by what you've already stated - you've got a pump with a new head & rotor installed, yet the pump guy did not install the static timing marks? That's sounds odd.
You didn't mention engine cranking speed. I mention it since it's often a prime issue with just about any modern Deere. The closed-center hydraulics often result is poor hot cranking - and that results in poor hot starting. Thus the utility of a $10 pump destroker.
Also, as another poster has mentioned - if the rocker-arm adjusters on the valves are too tight - the engine can start well cold, but barely start at all when hot. More common in gas engines suffering from valve-seat recession - but it happens at times in diesels depending on the quality of the last valve job.
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Today's Featured Article - George's Fordson Major - by Anthony West (UK). This is a bit of a technical info to add on to the article about George's Major in the "A Towny Goes Plowing" article. George bought his Major from a an implement sale about 18 years ago for £200.00. There is no known history regarding its origins or what service it had done, but the following work was undertaken by Harold alone to bring it up to show standard. From the engine number, it was found that the major was produced late 19
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