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 - The 8N and the Fox - by Zane Sherman. Dec. 13 1998, Renfroe, Alabama. Last niht I dreamed about the day that I plowed the field of about 10 acres over on what Jimmy and Dandy called the Ledbetter field. I was driving the 1948 8N Ford tractor that Jimmy bought in 48 new This was prebably in about 1951 and maybe even befor the house was built. This would have made me to be about16 years old and I drove the tractor for nothing and would have paid to drive it if I had had any money which I didn't, but neit
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