TN70 Won’t go into gear

[Mac Daddy]

Hey guys, this is my first time ever posting on a forum but I’m at my wits end. I have a Tn70 with 3100 hrs on it. I thought the clutch had gone out of it, but it never slipped when using. Always grabbed good.Recently I was shifting from forward to reverse and it would not engaged in any gear. No forward no reverse. Finally after playing with the shifters it went into gear and worked for about a day. Then it did it again. If I played around with the shifters, I could get it to go into gear, but if I shifted travel direction, it would not go back into gear. If I let it sit a day, It seems to go into gear and move, clutch seems to grab correctly, but only till I shift to change from forward/reverse. The linkage does feel loose like it’s not engaging. Mechanic said he feels it’s in the linkage but can’t seem to find the problem. Could it still be the clutch, even though it was never slipping. The clutch pedal was releasing very high at the top. I was wandering if it could also be electrical? Any help will be so much appreciated! Thanks yall

 

[Harry in Ky]

Nothing electrical unless it's a power shuttle. Your description of events kind of rules that out. There is one thing that comes to mind. On the mechanical shuttle tractors there have been a few issues where the roll pin securing the shuttle shift fork to it's respective shift rail has sheared. This results in very limited (or absolutely no) action internally to shift the shuttle synchronizer. The shifter and external linkage all moves as it should, you can feel the detents, the neutral switch operates, but the shift fork inside does pretty much what it wants to. To get to that roll pin is a project.

 

[Mac Daddy]

Thank you so much Harry. This sounds exactly like what has taken place. I will look into what it takes to repair that roll pin