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John Deere Tractors Discussion Forum
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4020 Powershift Inching Pedal questions

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Jon (IN)

10-15-2006 18:38:22




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My 4020 only sees heavy work twice a year bushhogging about 40 acres of grass and some brush. While mowing this past weekend the inching pedal just doesn't feel right. Feels like a slipping clutch. This really started acting up after I was mowing and hit and old tree stump with the mower and it really bogged the tractor down, the cluth on the bushhog didn't slip and the tractor was really put under a load for 5 - 10 seconds. Now it just doesn't feel like there's much pedal there. Normal upshifts and downshifts I don't use the pedal, but going into reverse and just close quarters mowing, I ust the pedal quite a bit.
Wondering what your thought are on this? Is there an adjustment? Should I really get out of the habit of using the pedal?

Thanks,

Jon

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Gerald J.

10-15-2006 19:27:17




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 Re: 4020 Powershift Inching Pedal questions in reply to Jon (IN), 10-15-2006 18:38:22  
Its not a clutch pedal. It may look like one and it kind of works like one but all it is is a valve that dumps pressure from several hydraulic clutches in the transmission that guarantees a stop. It is of no benefit for shifting even into reverse. It is of great value for moving the tractor in small increments like when mowing up to a stump or backing up to hitch to something.

If the feel has changed it may be that some of the clutches are not holding as good after that stump impact or that the impact shook the pedal return spring loose. If the spring isn't pulling the pedal all the way up, then the inching valve may not be closing all the way and letting those clutches slip a little.

Gerald J.

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Jon (IN)

10-16-2006 05:58:56




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 Re: 4020 Powershift Inching Pedal questions in reply to Gerald J., 10-15-2006 19:27:17  
Thanks for the reply Gerald. Is there an adjustment to check for the pedal? I will look at the springs and see if I see anything there. As for reverse, what's the correct procedure for going from forward to reverse? Should you shift to neutral and come to a complete stop before shifting into reverse? I've done it a few time from just a slight, and I mean very slight roll, and the reverse shift if very abrupt. It easily spins the wheels a bit when the shift kicks in.
For what it's worth, the transmission seems to shift fine otherwise, all shifts are fairly stiff and the timing between them is smooth and consistant.

Thanks,
Jon

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Bob

10-16-2006 11:54:01




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 Re: 4020 Powershift Inching Pedal questions in reply to Jon (IN), 10-16-2006 05:58:56  
While there's certainly no reason to abuse the PS tranny when changing directions, it doesn't seem to bother shifting at a slight roll.

Mine has THOUSANDS of loader hours on it, had the SNOT beat out of it by the PO, and still works as good as new, after a bunch of tough hours around our place. They are TOUGH!



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Gerald J.

10-16-2006 09:11:12




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 Re: 4020 Powershift Inching Pedal questions in reply to Jon (IN), 10-16-2006 05:58:56  
I think its a good idea to use the brakes to stop when going from forward to reverse, if nothing more than to give better control. I don't have any direct experience with the Powershift and haven't yet read those chapters in the shop manual completely.

I'm sure there are adjustments. But I don't know what they are.

I know when my neighbor here had later Powershift tractors and was cultivating, when it was lunch time he'd turn out of the field drive way and yank the throttle open in a low gear, then run up through the gears and there was a divot in the gravel for each shift. He never broke a transmission either.

It might be good to check the transmission oil filters and oil pump pick up screen as well as the transmission oil pressure. There are procedures for these that depend on serial number in the I&T shop manual and I think in the Deere manual, at least in my manual for the pre console 4020. I've not seen the later Deere shop manual since it doesn't apply to my 4020.

Gerald J.

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Bob

10-16-2006 00:36:02




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 Re: 4020 Powershift Inching Pedal questions in reply to Gerald J., 10-15-2006 19:27:17  
Could the PTO overload have "smoked" the "transmission disconnect clutch" on the engine flywhell, and it is now slipping?



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Jon (IN)

10-16-2006 05:50:37




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 Re: 4020 Powershift Inching Pedal questions in reply to Bob, 10-16-2006 00:36:02  
Bob, I don't believe that's the case. The concern is only when I use the inching pedal. It just doesn't feel to all be there, like it used to be. If feels a bit like a slipped clutch, but as Gerald mentioned, I guess it really isn't a clutch, just part of the hydraulic circuit in the PS.
The tractor has good pulling power other wise, no "slipping feeling" at all when using the tractor otherwise. Been pulling some logs lately and tractor easily looses traction or pulls the front wheels with a slight "bog down" on the engine that I don't think I would get if the disconnect clutch was slipping.

Thanks,

Jon

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