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John Deere 3235C/Jacobson HR5111 - 134" Mower Build! #1331 05/07/2020 12:33 AM
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GatorS Offline OP
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I am taking the decks and some of the hydraulics off of a Jacobson HR5111 and mounting them on a John Deere 3235C reel mower. The hoped output is a John deere Jacobson hydrid that mows 134"

I bought both machines last year and am just now getting around to starting this. So far I have the John deere running and driving and it's hydraulics working to the old reel connection locations.

The Jacobson had a blown engine have the decks removed and am working on getting it ready to weld together to make 1 machine. I will load some pics soon and try to update as I build it out.

I am also using the 4 wheel drive axle from the Jacobson and mounting it on the Deere. It is partly because I am having to stretch the Dere to make the decks fit, and I want to make sure the machine has enough traction.


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Re: John Deere 3235C/Jacobson HR5111 - 134" Mower Build! [Re: GatorS] #1342 05/16/2020 07:06 PM
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bunkclimber Offline
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now this sounds like an interesting build..just in time for grass season.What is the engine on this?

Re: John Deere 3235C/Jacobson HR5111 - 134" Mower Build! [Re: GatorS] #1343 05/17/2020 12:16 AM
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Here is what I am starting with. John Deere 3235C

I went through this machine, it was driving when I got it, other than the flat tires. I changed the oil, hydraulic filter and put hoses onto the connections for the reels. I figured out how to get the hydraulics to come on and everything seems to work. The John deere is 2wd with a wide front axle. The engine is a 39 hp diesel, 3TNV84T

[Linked Image from live.staticflickr.com]

[Linked Image from live.staticflickr.com]

[Linked Image from live.staticflickr.com]

Here is the Jacobson HR5111, it has a kubota V2203 rated at 49 hp. I'm using the original JD hydraulics, so I don't think it will overload the engine. The hydraulic flow for the original reels is manualy adjustable. If the Jacobson decks bog the engine down I can throttle the flow till it keeps up.

[Linked Image from live.staticflickr.com]

[Linked Image from live.staticflickr.com]

[Linked Image from live.staticflickr.com]


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Re: John Deere 3235C/Jacobson HR5111 - 134" Mower Build! [Re: GatorS] #1344 05/18/2020 12:33 AM
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I had a long message typed up on here and my pc died...so here we go again.

Here is where we started.

[Linked Image from live.staticflickr.com]

I took two days to tear down the Jacobson. I don't know how anyone is supposed to work on these things. The more I took it apart the more I was amazed that anyone could work on it. In their defense I was servicing it from the top and it may have been easier to attack it from the bottom.

Here are some pics of the disassembly.

[url=https://flic.kr/p/2j2Pcqd][Linked Image from live.staticflickr.com]


You can see the condition of the engine in these pics. I have the head and the I believe all the parts. One day I will build it if I find a use for it. I will at least pull the oil pan and see how bad it is.
[Linked Image from live.staticflickr.com]

[Linked Image from live.staticflickr.com]

[Linked Image from live.staticflickr.com]

You can see the mess of hydraulic hoses and wires. Best I can tell you are supposed to service the hydraulic pumps through the floor board. It’s definitely easier when you can just cut the wires and disconnect the hoses. I don’t know if my floor will ever be clean again, I tried to catch all the oil in pans, but there was also a tremendous amount of dirt and grass packed in every nook and cranny. I still got old hydraulic fluid everywhere.

[Linked Image from live.staticflickr.com]

Here is the floor…..
[Linked Image from live.staticflickr.com]

I wiped it down pretty good then took it out and pressure washed it. Here is how it sits now.

[Linked Image from live.staticflickr.com]

I did cut the brace out of the center since this picture, the frame will wrap around the back of the John Deere rear end and weld on. I won’t have to grind on the Deere very much to make it fit. I may bolt it on if I can make it work. That way if all this fails I can put the Deere back together and sell it or at least drive it around the yard.

Here is the back of the John Deere 3235C, the frame will attach at the back of the unit.

[Linked Image from live.staticflickr.com]

On the front of the Deere the old lift arms were attached by pivot rods that go through the frame. The frame doubles as the hydraulic tank so I don't want to weld on it. I plan on fabricating a bracket to attach through the existing support holes that way it is supported by the holes that were designed for loading.

The plan at first is to get it driving with the rear of the Jacobson and rear decks then worry with the front deck attachment.

Original Deere front

[Linked Image from live.staticflickr.com]


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Re: John Deere 3235C/Jacobson HR5111 - 134" Mower Build! [Re: GatorS] #1345 05/18/2020 12:34 AM
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GatorS Offline OP
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Stripped down Deere front end.

BTW you can only link 10 pics at a time in one post.

[Linked Image from live.staticflickr.com]

The engine on the Deere is a 3TNV84T 39HP turbo. The Jacobson had a Kubota V2203 which is 49 hp. I am using the John deere hydraulics so hopefully engine will handle the loads. The cutting hydraulics for the Deere have adjustable flow so if it is too much power at full flow I can turn them down some. Not sure if that would reduce hp input from the engine. Probably not because the pump would still be making the same flow and pressure, At least I could adjust the speed some if needed.

Last edited by GatorS; 05/18/2020 12:42 AM.

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Re: John Deere 3235C/Jacobson HR5111 - 134" Mower Build! [Re: GatorS] #1346 05/18/2020 02:08 PM
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sonny Offline
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WOW! That is some engineering on them things!!!---glad I never had to work on one! Looks like you are making progress on it.


"A machine you build yourself is a vote for a different way of life. There are things you have to earn with your hands."
Re: John Deere 3235C/Jacobson HR5111 - 134" Mower Build! [Re: GatorS] #1347 05/18/2020 03:08 PM
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now I know why they catch fire so easy..too many nooks and crannies to catch grass and oil-what a combination for fire! keep up the good work-photos and descriptions of work done..nice job and interesting project

Re: John Deere 3235C/Jacobson HR5111 - 134" Mower Build! [Re: GatorS] #1348 05/18/2020 03:53 PM
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GatorS Offline OP
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Directly under the hydraulic tank is a steel box that surrounds the universal to the pump. When I took the box off it left a square of oily grass clippings surrounding the u joints. I don't see how it could have ever been greased where it was installed. The Jacobson had 3500 hours on it. The Deere is much more open than the Jacobson, there are still some parts that are hard to get to, but nothing like what was on the Jacobson.


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Re: John Deere 3235C/Jacobson HR5111 - 134" Mower Build! [Re: GatorS] #1354 05/21/2020 08:41 AM
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JIM Offline
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Looks like quite a project.


I know a lot about a lot of things BUT I still have a lot to learn.
Life is what you make of it. So, why not make a working machine to make it easier.
Re: John Deere 3235C/Jacobson HR5111 - 134" Mower Build! [Re: GatorS] #1357 05/22/2020 04:25 PM
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bunkclimber Offline
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sounds like you need to add the provision for a 60qt cooler mount,maybe on a fender or close by the operator so you could pour icy cooler water on a chassis fire, or at absolute-last-resort, a beer or two..with a machine this big, mowing has to be a 12pack minimum Im sure lol..In all seriousness, nice project..we need a few new ones here..I'll try to help once it stops raining

Re: John Deere 3235C/Jacobson HR5111 - 134" Mower Build! [Re: GatorS] #1358 05/22/2020 11:51 PM
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Last night I welded the frames together, I still have more welding to do to finish the merge then I have some fabrication to do to finish up. I said earlier that I spilt hydraulic oil all over my shop.... I was welding along and I had the engine wrapped in a fire blanket. I looked down and the floor drain in the shop was on fire. It was a small fire about 3" tall. I dumped a bucket of water down the drain and went back to welding. I did fire watch it for 20 minutes. Pics to come.

Have a safe Memorial Day Weekend


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Re: John Deere 3235C/Jacobson HR5111 - 134" Mower Build! [Re: GatorS] #1360 05/23/2020 09:40 PM
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sonny Offline
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Welder and torch fires are always present, it seams like! ---had a few myself over the years! --The worst one was inside a combine that I was welding on. ---I was inside it and thought it was getting kinda hot in there and when I raised the helmet -------YA, BIG ole fire in there!! I had to run and dump 50 gallons of water in there before I got it completely out!
Funny thing was that I had soaked the inside before I went in to weld! lol!!


"A machine you build yourself is a vote for a different way of life. There are things you have to earn with your hands."

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