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 - Sunday Drives - by Cowboy. Summer was finally upon us here in Northern Maine. We have two types of industry up here, one being "Forestry" (Wood Products) and the other "Farming" (Potatoes). There is no shortage of farm tractors and equipment around here! I have been restoring old Farm Tractors for the past 6 years, and have found it easier and less expensive to hit all the auctions and purchase whole tractors for parts needed. My wife who works at a local school, and only has weekends and summers off, while on t
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