1998 Nissan Patrol/Safari

1998 Nissan Patrol/Safari V8

What are some of the reason for the power steering pump to seize up. My mechanic told me that was the promblem why the power steering belt burst a few times. I have since changed the pump, it worked well for a while and then once again the belt burst. He told me that I need a new pump. But Iam concern that there might be another issue which caused the pump to seize. Please explain.
Sylvester Jarvis
July 3, 2010.

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