John Deere JD 4720 transmission problem: John Deere Review  -- John Deere Tractors Discussion Forum and Review John Deere JD 4720 transmission problem: John Deere Review -- John Deere Tractors Discussion Forum

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 07-18-2007, 17:42 Post: 143831
jbincconst



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 John Deere JD 4720 transmission problem

Anyone have trouble with E-Hydro pulling a fully loaded box blade. I bought the tractor 6-7-07 new, the problem is after the blade is full the transmission stops pulling, I have to depress the pedal almost to the floor to get moving again and when the blade unloads it lurches forward at a much higher speed. I can set the cruse at 1.5 MPH and load the blade and trans works fine. The dealer adjusted the trans and it works much better now but still could use improvment, the dealer said he could not adjust outside spec. Anyone have any ideas. JB






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 07-18-2007, 18:17 Post: 143835
kwschumm



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 John Deere JD 4720 transmission problem

What range are you in? Does the 4720 have a switch for LoadMatch and, if so, is it enabled?






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 07-18-2007, 19:03 Post: 143838
Billy

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 John Deere JD 4720 transmission problem

JB

Ken hit on what might be the problem. What range are you in?






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 07-23-2007, 14:40 Post: 143966
jbincconst



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 John Deere JD 4720 transmission problem

Loadmatch is off, I have to continually adjust foot pedal to get the tractor to move. The 4700 JD I own will climb a tree if I press the pedal down at 1.5 MPH in B range. I know the 4700 is mechanical Hydro and the 4720 is E-Hydro but I expected more with 10 more HP. JB






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 07-23-2007, 20:34 Post: 143976
earthwrks

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 John Deere JD 4720 transmission problem

I'm not a JD guy but I think I read somehwere something about an electronic switch or potentiometer that reads where the pedal is. I've heard they can go bad or get wet and short out .






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 08-21-2007, 21:08 Post: 144889
pelletfarmer

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 John Deere JD 4720 transmission problem

I'm just a rookie--got my 4320 in the spring too--but I don't think you wanna mash on the pedal there. Since it's not a throttle, you're just asking for a higher gear when you want a lower one, or something like that. Me, I don't use cruise. Some guys swear by the load-match and leave it on all the time; I don't. But then, I don't have a box scraper yet because nobody in mid-Mich seems to have an old one lying around (hint, hint).

What rpm are you running? What happens in low range?






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 08-27-2007, 17:22 Post: 145104
jbincconst



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 John Deere JD 4720 transmission problem

I run the rpm 2000 to 2400, the trans seems to pull better in low range. The trans problem seems to be worse after it heats up. The dealer came out and I demo the problem, they said run at higher rpm. The trans is much better now after the dealer adjusted the electronics, however on occasion the trans will stop pulling and the engine is not loaded.I have other problems I am trying to get fixed, leak down and the radio does not work 1/2 the time.






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 09-03-2007, 11:02 Post: 145311
pelletfarmer

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 John Deere JD 4720 transmission problem

Sorry, I missed that post. Doesn't sound good at all...I hope they got more than "run at higher rpm"! Reading back about the cruise and now your mention of radio, sure sounds like something funny electrically. Leak too, eh? "On occasion the trans will stop pulling" with no load...whew.

Did all this start just with the full boxblade, or were there problems earlier? Whatever the problem is (are?), I hope you get an actual fix. Thanks for letting us know. jk






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 09-04-2007, 10:25 Post: 145331
Murf

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 John Deere JD 4720 transmission problem

I am NOT a Deere expert at all, but I do know from speaking with a friend who has one that the dealers mechanic told him that JD has 'tweaked' some of the programming to 'fix' warranty problems they were having that were borderline abuse, not mechanical failures per se.

Amongst those mentioned was lugging a hydro, this is a killer on those machines. With an E-hydro I could see where it would be really easy to just tell the unit not to overload itself at RPM's that were too low for the power demand.

A comment like "...after the blade is full the transmission stops pulling...". a FULL box blade is a huge load, in fact probably about the biggest load that the average 3pth will ever see.

Maybe somebody else has run into this.

Best of luck.






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 09-06-2007, 17:52 Post: 145447
jbarrett

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 John Deere JD 4720 transmission problem

In my opinion the electronics is the problem, if this is the same trans as the 4700 it should be pretty tuff.I have put 1200 hrs. on the 4700 with same box blade, B range. I really never had a major problem except creeping. The 4720 does OK until it gets pretty warm then I have to go to low range which is ok but why I've got 10 more HP to pull through the tuff spots. I put the cruise on it works fine, JD just needs to get it's act together, should be no reason the 4720 will work in B range. JB






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Discussion Boards > Active Subjects > Messages as Posted > John Deere Review Forum

Thread 143831 Filter by Poster:
Billy 2 | earthwrks 1 | jbarrett 1 | jbincconst 3 | kwschumm 1 | Lwayne 1 | Murf 1 | pelletfarmer 2 |




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