hi i just purchased a 1978 b7100 4x4 with a brush hog and a tiller i brought it home and started going over things first i had to order new hubs for the rear axle way sloppy then started checking out all functions and determined that#2pto speed is inop #1 and #3 work but no #2 i have not ran any implements yet but still believe #2 is broke no drive when tractor is idleing in #2 pto and has drive on #1 and #3 at idle what could be wrong and what do i need to do to check it out your help will be appreciated . also what will it take to get and install a frontend loader onto this unit i see that there are plans avaible to build your own loader please help this is my first tractor