Unimog Won't Go

[pat356jones]

I have a Unimog FLU-419 and yesterday I moved it a couple hundred yards to do some work and it went forward fine. When I went to back up it would not go backwards. I put it in reverse as I always have but it would not move. I then put it in forward gear and it would not move forward either. I've tried everything - low range, high range, reverse and forward in low and high range, and everything seems to shift fine and the clutch seems OK but it just won't move in either direction. The PTO works OK and I used the backhoe some to do the work I needed to do and I moved it into place using the backhoe but it just won't go forward or backwards on its own. Does anyone have any ideas as to why this Unimog won't move?

 

[Hank Baer]

I have a Unimog FLU-419 and yesterday I moved it a couple hundred yards to do some work and it went forward fine. When I went to back up it would not go backwards. I put it in reverse as I always have but it would not move. I then put it in forward gear and it would not move forward either. I've tried everything - low range, high range, reverse and forward in low and high range, and everything seems to shift fine and the clutch seems OK but it just won't move in either direction. The PTO works OK and I used the backhoe some to do the work I needed to do and I moved it into place using the backhoe but it just won't go forward or backwards on its own. Does anyone have any ideas as to why this Unimog won't move?

 

[Hank Baer]

Sounds like you have clutch or linkage problems.

 

[Pinsandpitons]

Direct / underdrive selector stuck between the two? Doesn’t sound too much like the common shift bushing failure. You have pto so the clutch is fine, 4x4 selector won’t create a neutral.... the direct/under is the only thing that comes to mind.

 

[pat356jones]

Sounds like you have clutch or linkage problems.

Thanks! That's what I thought too and that's what we're going to troubleshoot next week.

 

[f800]

Did you ever resolve this issue?

 

[pat356jones]

Yes, it had something to do with the air system on the shifter.

 

[pat356jones]

Yes, it had something to do with the air system on the shifter.

It's back running great again, going over 50mph and I'm using it like crazy. I dug a septic system lthis week and used it to place 16 foot long concrete lintels on the 18th course of a CMU barn I'm building.

 

[f800]

Was it the air shift solenoid ?

 

[pat356jones]

Was it the air shift solenoid ?

I'm not sure but I think so. It was a part that was difficult to access under the passenger seat area. At first we thought we might need to cut a hand hole under the seat and cover it with a plate but my mechanic friend was able to access it without doing this. All I know is that he fixed it and that it's running great now and moving as it was built to move. Everything is working on it now.

 

[Hank Baer]

Good to hear the Unimog is running again.