Hello Dave.
On the pump there is a bracket with an adjuster on it.
First you must loosen the bolt designed to tighten the bracket from slipping after the adjustment is set and the pump pivot on the opposite side.
Then the long adjuster bolt must be loosened to allow the pump to swing.
A little bit of light oil on the threads will aid turning them.
On the diagram below look at the top left to see the brackets.
I apologize for the size of it, we are limited here.
if you need more help with this please ask me here.
Thank you for using FixYa.
KL