Fan Hubs

[travelite]

Folks,

I decided to split this out into it's own thread:

It's always a good idea to periodically check your fan hub. I think Prevost's now on their third generation fan hub. With the tensioning air bags dumped, and the engine stop switch thrown in the engine compartment, spin the fan 360 deg in it's normal direction of travel. It should spin freely with no noise and no resistance. In my opinion, the fan drive system on a Prevost is far better than the hydraulic system we had in our Blue Birds, but we do need to keep an eye on the fan hub. Part of my pre-departure is to freewheel the fan looking for unimpeded motion. I had my hub replaced up in Redmond, BC when I bought the coach. If you have a fan hub mechanical failure you're SOL, but if you have an electrical failure you can lock the hub so the fan spins constantly. It's a temporary fix designed to get you to the next service center. On the XL I think one locking bolt is located in the center of the fan shaft on the engine side; I'm not sure where the other one is. Remove them and screw them it into the locking plate on the clutch. There are two locking plate/tabs located 180 deg relative to each other:



If you have a second generation fan hub like mine, the four red capped bolts in the attached pic are the locking bolts. In case of electrical failure remove the red bolts and screw them into the 4 threaded holes in the hub (two of the holes are shown):



The third generation has a stud, nut and plate. You unlock the plate and slide it over: