My friend and I just picked up a 7753 with a 910 backhoe. The guy we bought it from did not know much about it, it was his son's machine and he is not around any more. Question I have is that we can not get the backhoe to work without someone sitting in the cab and holding the right aux swith to the right. We hit the aux button on the dash and still will not work without someone sitting in the cab. If we hit the aux button twice and the two lights come on, one showing the aux is on and the other showing it is locked it still will not work. Any ideas what we are doing wrong? thanks!