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Kartvines, I have a #7 on a JD 750 tractor. The 750 is the predecessor to your 770. On the 750 model, the backhoe frame extends about three feet under the tractor to brackets mounted on the engine frame just ahead of the floorboards. On the 770, I do not think you have that front frame assembly. The rear brackets under the PTO are the same where the crossbar of the hoe subframe slides into those brackets. What may help you is the safety link that Deere shipped out to all #7 backhoe owners in the late 1980's. There were problems with the #7 coming detached from the tractor during use and several injuries had been reported. The safety link connects to the hoe subframe just under the hydraulic valve assemby (right under the seat bracket) and ran up to the three point top link of the tractor. Therefore, you would mount the hoe on the tractor and then connect this safety link in place. If the front frame connection broke loose or failed, the hoe would stay on the tractor by virtue of the top link connection. If you can locate one of these links or fabricate your own, you may solve your problem or at least reduce the problem. Try and get the front connections to work correctly first. Use the top link connection as extra insurance. Whatever you do, make sure you do not shortcut anywhere. Make sure that hoe is PART of the tractor. There is nothing worse than being at the edge of a seven foot deep hole and the backhoe pops loose from the tractor and it and you fall into the hole while the tracor sits up on high ground. Stay safe. SantaC
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