while your pump might LOVE to be dropped to have the sump cleaned.. and maybee the relief repalced. It likely won't have much to do with the lift dropping when you clutch.
take some time and read the fo4 manual.. and notice that the lift cyl is UNDER the top cover. not in the pump itself.
while true you would pull the pto to drop the pump. you do not pul the pto to remove the lift cover.
on an 8n.. you just undo the 3pt linkage knuckles, remove seat and perimeter bolts.. and pull it. ifd a 9n/2n cover / pump.. you have to disconnect the control ford.
on either.. putting the cover back on, you need the inspec covers off to get the fork back on.. or the control rod in the slot onthe pump control.
simple gasket set. top cover and 3 under the cyl. plus i'd get a naa piston and oring and backup washer ( if it does not already have the naa piston.. etc. ).
if the bore is scratched a bit. hone with a brake hoe. if it's badly scratched.. repalce it. note. some repalcement cyls need a lil grinding to fit properly.