Now PTO works -all the way forward have lift and no pto--up one notch and lifts with pto----problem is it grinds gears when trying to change positions of the pto lever....can put in all the way forward before cranking it but when you try to put it in the pto and lift spot it grinds--have to kill it, put it in pto with lift notch then crank it with pto in gear...What do I check?? Thanks