I've done it in frame, it was a pain.
easier to take it out and attend to those udder thins ya'll been wantin' ta doo

like replace some seal or gasket and blowing the chit out of the fins.
replacing a broken/missing cooling shroud bolts or reaching around with air hose and blowing the stator area out, checking the ball in the front rag coupling.
As I say, there ain't no 5 minute jobs, just wishful thinking people.
Maybe tighten/grease the axle pivot,give the area a good cleaning, good time to
tighten yer balls in the steering box, give a 1/4 turn to the cam follower in there also.
Well you get the picture

pro active beats the chit out of reactive every time.