How do you change the hydraulic pump on a Case 580B backhoe?

To change the hydraulic pump on a Case 580B backhoe, first ensure the machine is turned off and disconnected from any power source. Drain the hydraulic fluid and remove the necessary covers to access the pump. Disconnect the hydraulic lines and electrical connections, then unbolt the old pump and replace it with the new one, ensuring all connections are secure. Finally, refill the hydraulic system with fluid, bleed any air from the lines, and test the pump for proper operation.