I replaced the Power Steering Pump with a new one, but all is not well.

The new pump still howls, but different.
There are dead spots where it doesn't like the PS is working.
The old one didn't have these.
The old pump didn't leak and the bearing felt tight.
I've replaced PS pumps before with out trouble. Am I missing something?

Ralph

1991 Toyota 4x4 Standard Cab Pickup.
engnbldr cam and head.
Doug Thorley Headers
Home Made Cat Backs
30x9.5x15 BF Goodrich All-Terrain M/T KM2