Re: Power Shift or Shuttle Shift on 3020 JD

Posted by Gerald J. on January 10, 2007 at 11:13:32 from (67.0.103.163):

In Reply to: Power Shift or Shuttle Shift on 3020 JD posted by Robert Searcy on January 10, 2007 at 10:18:20:

The options that I know are Power Shift and Synchro Range.

Power shift is a planetary transmission hydraulically shifted. I has a "clutch" pedal for inching, but that's just a valve to the hydraulics. It has a hand lever to disconnect the engine from the transmission. Its a tough transmission, hard to break but very expensive to fix. Its picky about clean and cool oil. It and the brakes are picky about the oil meeting Deere specifications.

SynchroRange has the effect of a 2 speed plus reverse synchronized transmission behind a 4 speed gear slider transmission. Though its all done on three parallel shafts. Its also a tough transmission. Learning to shift it takes a couple minutes, some never figure it out, but it works for me on my 4020.

Either transmission is rapidly destroyed by towing the tractor without shifting the transmission to the tow position or using the towing disconnect lever. Its easy to get the top shaft spinning thousands of RPM without running the pump to keep it oiled and gears tend to weld to the shaft under those conditions.

If either transmission isn't too noisy and doesn't slip out of gear (SR, often caused by worn external linkage), it will run years with an occasional dose of fresh oil. Both are good transmissions, the PS is a little easier to use.

My neighbor farmed here 30 years with Deere PS tractors. Never had to have a transmission worked on. Many days, I'd hear him leave the field at lunch time with a cultivator on the back. He'd set the throttle for full speed and work his way up the gears on the PS. If I went out and looked at his tracks, there'd be a divot in the gravel of his tracks where he made each shift. So maybe the shifts weren't perfectly smooth, but it made them all the years he wanted them made. He did have several tractors in that time, all green, all with PS.

Gerald J.

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