94' Dynasty coach makes odd steering noise with no input.

[Jensen]

Every time the coach is at rest (startup, stoplight) I notice a noise much like a busy steam line pulsing rhythmically from beneath the floor!!!
Seems as though the pump were trying to push more fluid than there is a demand for.
Additionally, I feel light mechanical grinding in the steering wheel and hear an annoying cavitation sound from that same spot in floor at higher rpm.
Fluid level is proper and despite that cavitation sound it still steers lightly.
I'm not sure what to make of this and would appreciate any input.
Thanks!

[RV Wizard]

Hello Jensen and . We are glad to have you join us here and we look forward to reading of your adventures and experiences. I am sure you will enjoy the website and forums. Good luck, stay safe and keep us posted.
I am sure you have checked the hydraulic fluid reservoir for the power steering. If you have hydraulic leveling system, this is not the same reservoir. If so, have you noticed any leaking? I would suggest a good large truck mechanic to inspect and diagnose.

[Midniteoyl]

Are you sure its the steering pump?

[Papa_Jim]

Check your steering hydraulic filters. There's three filters in the big tank at the back in the big canister when you open the rear engine door.

[JohnRR]

As you see your questions will get a lot of answers, enjoy your stay.

[Papa_Jim]

The part# for the hydraulic canister filters is Nelson or Fleetguard# 84101B. You need 3 of them.