SEE Transmission not operating in any forward or reverse gear

[f800]

I'm hoping it's the air shift solenoid. Do I have to tilt the cab to access it?

Is it # 28 in the below diagram?

The front bucket and backhoe work without any problem. Just have to push/pull it to the site to dig a hole.

 

[Pinsandpitons]

If you can't get the transmission into any gear, it's not the air shift system. Can you shift into any or all gears, i.e. does the clutch work?

 

[f800]

I can shift into all the gears. Clutch works. Able to engage the backhoe

 

[Speedwoble]

Look up the shifter bushing.

 

[f800]

I had to read that thread before I posted. It is my understanding that bushing replacement is for difficult or non shifting. I have no problem engaging each gear.

 

[Speedwoble]

I had to read that thread before I posted. It is my understanding that bushing replacement is for difficult or non shifting. I have no problem engaging each gear.

Sorry, I did not catch that. If you can get both shifters into the detents smoothly, then it is something in between. Either the cascade box is fragged, or the high/low shift is in an intermediate positions that doesn't exist. Were you doing anything when the problem appeared, or did it just happen one day? If I understand correctly, the cascade has helical cut gears and will generate a lot of thrust loads if used to pull/push heavy loads. The Cascade box is for speed reduction, not stump pulling torque. Think of FluFarms snowblower where he wants to travel slowly at high engine RPM.

 

[f800]

I was idling in in the back yard with a bucket of dirt and pushed the clutch in to slow down as I approached where I was going to drop. When I released the clutch, nothing happened. I can shift into any gear position without the clutch

 

[Pinsandpitons]

The clutch works? You can engage the PTO and disengage it by leaving the lever back and pushing the clutch in? Any noises around the time it stopped moving under it's own power?

 

[f800]

Yes, I need the clutch to engage pto and the backhoe works ( along with the front bucket, which doesn't need the clutch). That's why I thought it may be the air shift solenoid.
Didnt pickup on any noise when it stopped. Just pushed in clutch to slow down, released and no movement.

 

[The FLU farm]

I'm no expert since my FLUs are always in Low on the splitter, but if it works like a splitter in a truck trans, it can leave you between gears.
From what you've described, it's feasible that it's splitter related, I'd think.

 

[f800]

That's sounds...expensive. So no one thinks it could be the air shift solenoid?

 

[The FLU farm]

Yeah, I still think it could be air shifter related.
If it were me, I'd make it work in low range and leave it there. I never mess with that splitter anyway.
Of course, I don't usually drive the FLUs on the road.

 

[f800]

Any ideas on where to access the solenoid?

 

[porkysplace]

Any ideas on where to access the solenoid?

What's the NSN and part number ?

 

[Speedwoble]

Any ideas on where to access the solenoid?

Look at TM4-2420-224-24P-1, page 119.

You will get to tilt your cab.

 

[Pinsandpitons]

Yeah, I still think it could be air shifter related.
If it were me, I'd make it work in low range and leave it there. I never mess with that splitter anyway.
Of course, I don't usually drive the FLUs on the road.

Maybe I am miss reading something here, but as I understand it the transmission is in direct or high when operated normally and the air shifter lowers the gear ratio. In other words the air shifter is an under drive not an overdrive. If one were to drive the truck without waiting for air pressure to develop to the point where the air shifter would work, you’d simply be driving around in direct ratios. Am I somehow wrong in this understanding? Not knowing the details of the intricacies in that mechanism I’m speaking off-the-cuff, but it’s probably spring loaded right? So the shift collar is held in direct range when air pressure isn’t delivered to that actuator, thus if the suspect is the air shift system perhaps it’s a broken spring? Anything else broken that would cause these symptoms in my mind would make a loud scary noise.

 

[f800]

Oh crap. I was afraid you’d say that. I’ll have to wait a couple weeks to get to it. Thanks

 

[Muellerter]

Sorry to hijack this thread. I don’t know how to start a new thread. I have some Troubleshooting/parts questions. FLU 419 won’t drive due to binding in the driveline. With both axles off the ground, the rear spins/drives normally- by hand or powered. 4WD/lockers disengaged. The front wheels will spin fine in opposite directions but will not turn in the same direction whether forward or reverse. As though the driveshaft is binding. Removed the drain plug from front drive of tranny and can smoothly turn the spur gear with screwdriver - no metal on magnetic drain plug. I’m thinking the problem must be with the Ujoint but wanted another opinion before tearing apart. Is this a known failure mode? What tends to bind up? Couldn’t find any answers on prior posts. Are there any other parts that are prudent to change while front is removed for u joint? I’m assuming I’ll need to drop the front axle. Not sure if another problem is associated with this or not but it has also been leaking oil from front ujoint boot whenever the PTO is engaged and the trucks not moving. Not sure if it’s dripping from above the boot and running off the bottom but inside of boot looks dry. (Boot is torn). Thanks in advance

 

[alpine44]

Sorry to hijack this thread. I don’t know how to start a new thread. I have some Troubleshooting/parts questions. FLU 419 won’t drive due to binding in the driveline. With both axles off the ground, the rear spins/drives normally- by hand or powered. 4WD/lockers disengaged. The front wheels will spin fine in opposite directions but will not turn in the same direction whether forward or reverse. As though the driveshaft is binding. Removed the drain plug from front drive of tranny and can smoothly turn the spur gear with screwdriver - no metal on magnetic drain plug. I’m thinking the problem must be with the Ujoint but wanted another opinion before tearing apart. Is this a known failure mode? What tends to bind up? Couldn’t find any answers on prior posts. Are there any other parts that are prudent to change while front is removed for u joint? I’m assuming I’ll need to drop the front axle. Not sure if another problem is associated with this or not but it has also been leaking oil from front ujoint boot whenever the PTO is engaged and the trucks not moving. Not sure if it’s dripping from above the boot and running off the bottom but inside of boot looks dry. (Boot is torn). Thanks in advance

To create a new thread, click the "Forum" tab on top of each page, then scroll down to the "Unimogs" subforum and click that link. On top of each subforum page is a "Post New Thread" button. (You can also click this link to get into in the Unimog forum).

Please edit your post here to point to that new thread. I will reply to your problems in the new thread

 

[coachgeo]

The largest collective English speaking Unimog folk, and they know FLU/SEE, etc as well is at benzworld.org/forums/unimog