I’ve only operated two backhoes in my life, and old Ford and my Case 580M. On neither of these could you raise the boom and retract the dipper at the same time like you can on an excavator. If you’re raising the boom and try to retract the dipper the boom stops. I’m told newer Case machines allow simultaneous operation of the boom, dipper and bucket. The boom controls on the hydraulic diagrams for the 580M and 580SM are different but I’m not smart enough to interpret. Any experience with this? I'm almost embarrassed I don't know this.