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  1. #1
    New Member
    Join Date
    Jan 2007
    Posts
    10
    Tractor
    JD 4120

    Default New Purchase - JD 3720 vs 4120

    I have been researching for some time for a first time tractor purchase. Own 37 acres in TN; about 20-22ac open fields. My research has led me to either the JD 3720 or 4120. I am not sure which model would be best. I thought the 4120 was the choice but wonder if that might too big or heavy for finish mowing. Would R4's tear up a yard too much?

    Two quotes so far on the 4120, 400X loader, MX5 cutter:

    John Deere.com lists at $31,800
    Dealer 1: $26,800
    Dealer 2: $26,960

    One quote so far on the 3720, MidPTO, 300x loader, MX5 cutter
    Deere.com lists at $31,000
    Dealer 1: $25,500

    Any help or advice would be appreciated.

  2. #2
    Elite Member Kyle_in_Tex's Avatar
    Join Date
    Oct 2002
    Posts
    4,678
    Location
    Giddings, Texas
    Tractor
    JD 4310,JD5420

    Default Re: New Purchase - JD 3720 vs 4120

    Although the 3720 is an awesome workhorse in a small package, the machine that you would shred 20-22 acres with is not the same machine you'd want to cut your front lawn.

    The 4120 gives a bit bigger footprint with bigger tires with just a small increase in turning radius. The bigger tires will ride smoother over the bumps. If you don't add liquid to the tires, the R4's won't hurt a lawn if the soil is relatively dry. You might even look at the MX 6 if you get the 4120. I cut about 22 of our 25 acres. (Roughly the same as you) Luckily, I have the use of my FIL's 5420 and a 6' Bushhog. Yes, I have cut it with my 4310 and a 5' cutter, but when it bogs down on power cutting thick Bahia grass, it sure is frustrating. (It can bog down the 5420 too). Not to mention taking much longer. I can cut up to 4 acres an hour with the 4310 but only on open fields that have been cut recently. Plan on a full day to cut 20 acres. Especially with a 5' cutter.

    Good luck on your search and your prices look competitive.

  3. #3
    Bronze Member
    Join Date
    Nov 2006
    Posts
    88
    Location
    Westwood, MA
    Tractor
    JD 4320

    Default Re: New Purchase - JD 3720 vs 4120

    4120......no questions asked. I purchased a 4320 a couple of months ago and am so glad that I went for the 4000 series rather than the 3000 series. It sounds like you have a lot of property and I think that the extra weight and size of the 4120 will really help you out.

  4. #4
    Silver Member
    Join Date
    Dec 2006
    Posts
    175

    Default Re: New Purchase - JD 3720 vs 4120

    I bought a new 3320 this fall with the e-hydro, cx loader, heavy duty bucket R4 tires, I-match with a few other options and paid $18,900. I looked at both a 3720 and 4520 but the 3320 fit my needs. The only difference beween a 3320 and 3720 is a turbo, turned up pump and a little larger radiator.

    I have a 65 hp farm tractor for the heavy mowing with a MX6 mower. I can cut pretty thick grass and weeds at about 4.5 mph. A MX6 should run you about $2100, a MX5 should be a couple hundred cheaper. The 3320 will pull a MX6 also but I have to go a little slower and go through shorter grass.

    There is hardly any price difference between the 3720 and 4320. I would go with the heavier frame 4xxx series due to the size of your operation. One thing to keep in mind though, the 3xxx series is really versatile with the loader, you can get into places the 4xxx wouldn't even think of. However, if mowing a large area is your goal, I think bigger is better. I personally thought paying an extra $3000 for the turbo on a 3720 was absolutly ridiculous. You can buy a replacement turbo on a 180 hp farm tractor for about $800, you know JD is really sticking it to you for those few extra horses on their compacts.

    If you are going to cut all that grass (and money is not a concern) you may think about a cab. I considered it but couldn't get past the $5000 plus price tag. The $100 umbrella sounds like a better deal to me, however, that air conditioning sure would be nice on a hot humid day, not to even mention swatting the mosquitos.

  5. #5
    Veteran Member
    Join Date
    Dec 2004
    Posts
    2,273
    Location
    western NC
    Tractor
    JD 2320; 4520

    Default Re: New Purchase - JD 3720 vs 4120

    Jim,

    I have had both a 3000 and 4000 series tractor. In fact I have owned three mid-frames, two of which have been 3720's. This is what I have now. As far as which one is better, I think with the size of your property the larger machine is your better choice. You will not be able to duplicate the power-weight of the 3720 with the 4120, but it will do a great job. The large frame 4000 series do ride a little better over rough bumps. Fuel consumption is higher but not by that much. The 3720 would do fine also, though. They are seemingly a little harder to find, as they are the top of the 3000 series, where the 4120 as the entry level 4000 series machine, is more ubiquitous. Neither machine would damage grass with R4 tires, even loaded. The 3000 series is by far more manuverable and somewhat easier to see around for sure, but the 4000 series machines are pretty agile for their size, just not as agile as the 3720 would be. So, open fields favor the larger machine, tight spaces (such as my property) favor the smaller machine. I would probably still have my 4520 if I could have fit it into the spaces I needed. I could not access about 20% of my property due to its dimensions, so for me a mid frame was actually MORE versatile.

    John M

  6. #6
    Veteran Member
    Join Date
    Oct 2004
    Posts
    1,401
    Location
    Georgia

    Default Re: New Purchase - JD 3720 vs 4120

    Jim sent you a PM
    GreenSouth Equipment
    14 locations throughout FL, GA, & SC
    www.greensouth.com
    www.greensouthused.com

  7. #7
    New Member
    Join Date
    Jan 2007
    Posts
    10
    Tractor
    JD 4120

    Default Re: New Purchase - JD 3720 vs 4120

    Thanks for the feedback so far; it is really nice to hear comments from people who have been actively using a particular model.

    Anyone know of issues with the 4120 pulling the MX6 cutter from a size standpoint? I imagine the loader balances the tractor fairly well with the cutter.

    Also, anyone seeing the need for a ballast box when using the loader with the 4120?

    Thanks again for the advice.

  8. #8
    Gold Member
    Join Date
    Aug 2005
    Posts
    303
    Location
    Hunterdon County, NJ
    Tractor
    JD 4320

    Default Re: New Purchase - JD 3720 vs 4120

    Jim, my 4320 pulls a 6' brush cutter of questionable heritage without a problem.

    As for the ballast box, you will absolutely need something. I bought the JD box, put casters on it and filled it with concrete, and it weighs +/- 820 lbs. It does the trick. On the other hand I have a grapple, HD bucket w/ teeth and that puts a lot of weight on the front end too, so a counterweight is an absolute.

  9. #9
    New Member
    Join Date
    Feb 2006
    Posts
    11
    Location
    vermont
    Tractor
    2006 John Deere 4120

    Default Re: New Purchase - JD 3720 vs 4120

    Jim

    I also had the same dilemma when upgrading from my JD 4400. It was a difficult decision to choose between the 3720 and the 4120. I ultimately chose the 4120 and I'm very happy with my decision. At the time I was concerned with the larger frame, but have not found any problems. It has proven to be much more stable than my 4400 which is similiar in size to the 3720.

    I use a MX6 without a ballast box. I have found the loaded rear tires and the front bucket have been sufficient for balance.

    Good luck with your decision. They are both good tractors.

  10. #10
    New Member
    Join Date
    Jan 2007
    Posts
    10
    Tractor
    JD 4120

    Default Re: New Purchase - JD 3720 vs 4120

    Just wanted to say thanks for all the info from everyone and all the informative posts; pulled the trigger on the 4120 last March and have been extremely pleased with it so far. Glad I went with the bigger machine versus the 3720. See the attached photo. Thanks again!
    Attached Images Attached Images

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