Yard Machine rear axle replacement info or source for manuals on the yard machine.

I need to find info on replacing the rear axle on a yard machine riding mower. The model #s given to me are between 690 and 699. Build date was 1999. I have the illistrated parts book but no information on how to replace the axle. The searches I have done have come up negative on finding a pdf manual that can help me with finding the information needed.
Any and all help is greatly appreciated.
This ole rural okie.
Robert:smile::laughing: