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4630 powershift first four 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
 
My first thought is what is the transmission pressure, and 2, what did the transmission filters look like when you changed them, when things like this are happening it pays to cut a chunk out of the filter and scrape the paper with the blade and try to get an idea on what is there. Weak or surging transmission pressure will give this kind of result...
 
Tim
I agree on the need for testing pressure & new filters but since the trans operates correctly sometimes could the problem be in worn trans control valve?
`
 
Yes that is possible,, but the shift valves rarely give any problem,,some times a clutch pac piston will leak, then not leak giving this result also,putting the power shift gauge set on will point him in the right direction,,,all in all the Deere power shits system is pretty good, there are old 4020 Power shifts running around here that have never been torn down, of course they are only dealing with 100HP or so...One other thing to think about since this is a dry drive clutch is that could be slipping and then holding too....
 
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