Its good for several hours running but cant be ignored
Glad I saw this thread. We had a 10 hour trip today so I brought along my coveralls and some ramps. Only had to stop twice to re-lube the splines. Dang that pump was hot.
Actually, NO, I did not do that. Yes you lose your power steering if the hydraulic pump quits working but you can still steer the coach. This could let you drive home from wherever, BUT, the same pump also drives the radiator fan on side-mounted radiators and you would not get very far with the radiator fan dead and your engine over-heating.
I chose to lube mine for now. It was rusted, fairly dry but the splines were not fretted much after 17,000 miles.
When I have lots of time I will consider the wet PTO kit. Even the wet PTO kit can have problems with the lube oil bypassing the shaft seal, = oil leak.
No guesses here, no 3rd party anecdotal info, just from my experience.