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4630 powershift first 4 gears

M

Mitch.1177

New User
We have a 4630 powershift. We were planting yesterday, and about half of the times I tried to go from park to first gear, it would not engage. I tried using the clutch, and also not using the clutch. If it did not engage, I could feel the tractor jolt like it was trying to go. If I shifted to second when it was "slipping" it would give another jolt, but nothing. It did the same for shifts into 3rd and 4th while "slipping" I also tried using the clutch to start in 3rd and 4th, and got the same jolt with a slipping feel. What is strange is that if I used the clutch to start in 5th, it engaged every time, and then I could downshift to all lower gears perfectly. All gears shift and lock up great after it gets going. I never tried shifting from a slipping 4th to 5th. Like I said, this only happens about half of the time, and when it does engage, it shifts like a champ! Anybody have any thoughts or ideas? Any help would be appreciated!

Thanks,
Mitch
 

A pressure test would help diagnose but I think the problem is in the trans control valve.
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Had this same problem with a 4440. The shift linkage in the cab was badly worn(loader tractor) and the lever wasn't shifting the foward neutral reverse linkage into the forward detent, but shifting up into 5 and higher gears where the linkage wasn't worn so much would move the trans into the forward detent. Now with the tractor off and on a flat surface, open up the lower right window and have somebody move the shift linkage as you watch what happens on the valve body, or just take a flashlight and look under the shift lever and see how worn it is. I built up the linkage with weld, his console was also severely worn which didn't help. A pressure check would also be good and show you whats going on for sure. chris
 
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