580B backhoe hydraulic pump shaft?

Hello to everyone! I am new to the site and would like to ask a question about my backhoe. I have a Case 580B and had a problem of the hydraulics not working so I tore it down and come to find out the splines on the hydraulic pump shaft are stripped off, the coupler and other shaft are fine.My question can you get the shaft to replace it or do you have to replace the pump? Thanks for any Info.

580B backhoe hydraulic pump shaft?