JD 4440 park question

notjustair

Well-known Member
I've never (in the last 20 years) been able to trust the park pawl on the quad shift 4440. If you set it and do it again it might hold, or the tractor and baler may end up at the bottom of a ravine. Don't ask.

I put a new shift kit in the powershift 7800. It had multiple symptoms, but the park jumping was one of them. That kit fixed the 7800 and everything works like new. My question is: is there something that could come in a kit that needs replacing to make the park pawl work more reliably on the 4440? I have no idea how those engage, but the quad shift works well and always has worked the same in all of the years it has been on this farm.
 
Park on the quad range shifts the bottom shaft into two gears at the same time to lock the pinion shaft. IF all 4 ranges work properly, it is likely the spring in the shifter cam that engages the second collar for park. The spring allows you to shift to park when the gears don't line up then if the tractor moves slightly, the spring engages the collar to lock in park. The spring can weaken or break causing the problem you are describing. It is inside the transmission and not a simple fix.
 
There's no "park pawl" in a QR. The shifter lever and "cam" in the tranny jam the shift collars on the lower shaft into two ranges at the same time, locking up the tranny.

NOT sure what you have going on that it's not doing that.
 

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