no reverse on 50A massey ind back hoe and loader

[rs2570]

I Bought this backhoe last summer and it has no reverse what so ever. I have adjusted linkage changed fluid and still nothing. serial # 9A206820 .Does anyone have any ideas what the problem could be ? The forward works great.

 

[Tectal]

Hello. Are you still needing help ?. If so let me know. Is yours the two speed auto with the two peddles marked R and F ?.