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  1. #1
    New Member
    Join Date
    Jan 2013
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    5
    Location
    Dewey, Arizona
    Tractor
    John Deere 3120

    Default Now Power in "C" hydro for 3120

    I just found this site and recently a used JD 3120. It has 300x loader and "box" gannon.
    My problem is that when the "eHydro" transmission is in "C", it acts like it is overloaded.
    Works fine in "A" and "B" gears. It is overloaded or did I buy a problem.
    I traded in my old Ford 8N which I am already missing.
    Thanks for any inputs. Al.

  2. #2
    Elite Member DT86's Avatar
    Join Date
    Dec 2010
    Posts
    2,992
    Location
    SWVA
    Tractor
    Kubota 9540, RTV 900 and David Brown 885.

    Default

    Are you using the box blade in "C"?

  3. #3
    Super Member
    Join Date
    Feb 2008
    Posts
    9,392
    Location
    somewhere usa
    Tractor
    Deere 110tlb, 4520, x749, L130

    Default Re: Now Power in "C" hydro for 3120

    Lots of weight on a low hp tractor, I would expect the high range to be somewhat sluggish. Try easing into the forward pedal allowing it to gain speed.

  4. #4
    Platinum Member
    Join Date
    Jul 2012
    Posts
    847
    Location
    Southeast Minnesota
    Tractor
    JD 4720, JD X748SE, JD 997, Farmall "B"

    Default Re: Now Power in "C" hydro for 3120

    Even on my 4720, "C" range seems to only be good for transport. I've only had my 4720 since april, but put 200 hours on it, and I've always wondered if the hydro relief pressure was set right... I can get it to "screech" pretty easy when in c range. I would not even consider doing any actual work in C range. Also, If the LoadMatch is active, it will "throttle back" the hydro valves so the engine can catch up with the tranny load, in effect automatically doing what Jenkinsph is suggesting. In general I think LoadMatch is great, but I've heard that it can make the lower HP machines feel a little sluggish. You could disable it to see if it makes a difference. But I think A&B range will be where you want be working, with LoadMatch enabled.

  5. #5
    Padawan Tractor Learner
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    Johndeere3720's Avatar
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    Mar 2009
    Posts
    6,368
    Location
    NW Oregon
    Tractor
    Deere 317 & L118

    Default Re: Now Power in "C" hydro for 3120

    C range is basically just for road transport, it is almost completely useless for ground engaging work as it does not allow you to get torque to your wheels. Thus Deere put in B range which combines Torque with speed, it isn't quite as fast but you defiantly see the difference in power. I have logged about 1000 hours on a 3720, C range was only used for transport between locations or mowing on flat ground.
    My Fleet:
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  6. #6
    New Member
    Join Date
    Jan 2013
    Posts
    5
    Location
    Dewey, Arizona
    Tractor
    John Deere 3120

    Default Re: Now Power in "C" hydro for 3120

    Quote Originally Posted by Johndeere3720 View Post
    C range is basically just for road transport, it is almost completely useless for ground engaging work as it does not allow you to get torque to your wheels. Thus Deere put in B range which combines Torque with speed, it isn't quite as fast but you defiantly see the difference in power. I have logged about 1000 hours on a 3720, C range was only used for transport between locations or mowing on flat ground.
    Thank you all for the replies. Both the "A" and "B" work fine even though I can't get more than 5 mph on the speedo. I have both the loader and the gannon up, just trying to see if it can get up to the advertised speed with the tires it has (15.00-19.5 R4). So starting out in "C" I can depress the "fwd" pedal about 1/3 and set the RPM to about 1500. It works fine (5 mph !) until I push on the "fwd" pedal and then the RPM's start decreasing, almost to Zero until I take my foot off the pedal and then it revs back up. So now I am wondering if there is some kind of "speed" governer set that I don't know about. Cleaning it up after I bought it, there was lots of hay type debris on the underneath. And it needed lots of WD 40 on the pedals.
    Thank you again for any more ideas. Al.
    I forgot to mention that I do not have load match, just a basic eHydro tranny.

  7. #7
    Gold Member
    Join Date
    Jun 2008
    Posts
    278
    Location
    Kentucky
    Tractor
    John Deere 3320 - gator cx

    Default Re: Now Power in "C" hydro for 3120

    Sounds like the speedmatch is stuck on. Check the buttons on the fender and see if any are pressed. If it still doesn't speed up, try disconnecting the battery and hook it back up. My loadmatch got stuck once and it wouldn't hardly go untill I did the battery. It's fine now.

  8. #8
    Gold Member
    Join Date
    Jun 2008
    Posts
    278
    Location
    Kentucky
    Tractor
    John Deere 3320 - gator cx

    Default Re: Now Power in "C" hydro for 3120

    Sounds like the speedmatch is stuck on. Check the buttons on the fender and see if any are pressed. If it still doesn't speed up, try disconnecting the battery and hook it back up. My loadmatch got stuck once and it wouldn't hardly go untill I did the battery. It's fine now. All the 3000 twenty come standard with loadmatch.

  9. #9
    New Member
    Join Date
    Jan 2013
    Posts
    5
    Location
    Dewey, Arizona
    Tractor
    John Deere 3120

    Default Re: Now Power in "C" hydro for 3120

    Thanks but that did not help. The only button on the right fender is the cruise control. According to the manual, there is no loadmatch or speed match. Also, it appears the speedo might not be accurate. Looks like a call to John Deere is in order. But if anyone else has had similar problems, I will post whatever the fix turns out to be. Al.

  10. #10
    New Member
    Join Date
    Jan 2013
    Posts
    5
    Location
    Dewey, Arizona
    Tractor
    John Deere 3120

    Default Re: Now Power in "C" hydro for 3120

    I now think the problem might be that it is really going faster than the speedo is indicating. I am going to check to see how to calibrate the speedo with the tires I have. Is it an easy fix or can only the dealer do it? The book says the speedo is set for "factory default tires". So I have no idea what size that would be. It now has 15-19.5 6P R4.
    Thanks for any help. Al.

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