Need help on powers steering noise

[Butch65]

Forum,
I recently changed the power steering pump and steering box. Changed the pump as it was squeeling at either end of the turn, and put in a 12:1 Lares 807 gearbox. I'm running March aluminum pulleys.
Following the installation I bled the system and it felt tight and sounded much quieter- no squeeling. My son drove it the next day, all looked good, but when he pulled into the garage the squeeling was back. I have bled the car several times ( using the vacuum method ) and each time the sound goes away, then comes back.
So here are my questions:
There are no leaks in the system- could air be pulled in somehow?
Is there an optimal pulley size for our rides- and does it change if the ratio changes?
I've read that pumps should match the gearbox - any ready references out there, or do I need to call Redhat or someone of that ilk?
And finally, any other ideas that you guys have?
As always, thanks for the help!
Butch

[jbojo]

Do you have an fluid cooler on the power steering system? Hot steering fluid can cause the squeal that you are describing. What happens if you let the car sit a few hours and then starting it again, is the squealing gone initially and then it comes back? Burnt fluid can also cause this too.

[rocket366]

My first thought is that the squeeling sound is the belt slipping?


Just a thought

Paul

[Butch65]

John-
Good thought - the cooler came off when the ac compressor pulled. The noise happens in both scenarios cold or hot.
Paul-
One of my initial actions was to replace the belts - went with the Continental that was reported to be the best. I'm considering taking a scotch brite pad to the grooves on the pulley.

Thanks -

[rocket366]

Scotchbrite is a waste of effort IMO

Make sure the "V" of the belt is the right width.

I've seen a too skinny a belt used and it will slip and squeel.

The belt should be flush or a bit proud in the pulley you can
also try a bit of belt dressing.

Paul

[72HCODE]

jut a quick question:

using type 'F' or power steering fluid?

[Butch65]

jut a quick question:

using type 'F' or power steering fluid?

HCode-
F Type.
Thanks for checking....