sorry for late response. i used to have a 709. The first time i tried hooking up i couldnt get it to go back enough. what i found out would work would be to tilt make sure the backhoe is retracted all the way. get in the machine in tilt the hoe attachment all the way down (left pedal) and...
bobcat sells the kit here, https://shop.bobcat.com/mount-kit-6586933
not cheap. i would stick with the newer 607 over an older model. the balls kinda suck. i'll keep my eyes open for you.
because when you are pulling the trigger it's closing the bucket, and its already close, to operate the bucket you should be using the thumb switch on the top of the right stick