I assume you've got the Stanadyne/Roosamaster DBGFC pump?
I'm not an IH expert, but I've rebuilt many of those pumps for other tractor makes. Generally speaking, DBG type pumps that mount vertically have an internal o-ring to prevent you from pulling the shaft out of the pump (or pump off the shaft).
But, horizontally mounted DBG pumps don't have that internal ring and are supposed to slide right off while the shaft stays fastened to the tractor timing case. Later DB2 pumps DO have a lock ring.
It sounds to me like your's is supposed to slide right off - but - you've either got a wear ridge in the front bushing that your umbrella seals are catching on - or - your governor is falling apart and hanging up. You are supposed to tie the throttle lever back with a piece of wire at full-throttle position before pulling off. This puts tension on the governor and holds it together when pulled off the driveshaft.
I'll add that if you can pull it out an 1", you can also then rotate the pump a bit away from the block? If so, it ought to give you plenty of room to remove the two throttle-shaft halfs and install new o-rings and teflon wear rings.
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