I have the service manual that covers 7400-7440 series. It won't have part numbers but will show you how the caster assembly connects with the banana bars, springs, frame, and such. email me and I'll forward what I have to you. sorry I'm new to the forum, guess I can't post an email. I'll look and see how I can post a link to it this week
Nick,
My tech was looking for blow up of all components associated with the caster assembly.
what is it you are looking for on the diagram