You can put just about any backhoe in the 3pt hitch, but thats a quick way to break your tractor. A lot of companies build subframe mount backhoes. Mahindra buys Bradco backhoes and slaps their name on them, bradco makes a very good backhoe. I'd expect Mahindra to be using some economey model but they are really choosing the cream of the crop in my opinion. Woods will be cheaper, I know they make a few Mahindra subframes. Bush Hog and Land pride may. They are the major backhoe companies, there are a few others but given that there are not many Mahindra's around I'd be surprised if they are building mounts for them.
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