2 Pt to 3 Pt Yanmar Tiller ??

   / 2 Pt to 3 Pt Yanmar Tiller ?? #1  

Ductape

Elite Member
Joined
Feb 12, 2006
Messages
4,805
Location
Central New Hampshire
Tractor
Kubota B3030HSDC
Thanks to another member here, i was able to purchase a reasonably priced 48" Yanmar tiller (thanks Noah!). Problem is.... its a 2pt. I KNOW many of you have these tillers converted to a 3pt hitch ! Lets see some pictures ! Specifically...... i'd like this to attach to my I-Match hitch. Do these rigs have a shear of any kind, or will i need to add a slip clutch to the PTO shaft? Where can i get a few replacement tines? Can anyone read Japanese to tell me what exactly the decals say?
 

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   / 2 Pt to 3 Pt Yanmar Tiller ?? #2  
Welcome Ductape, looks like a nice tiller for a project. The tag in pic 3 looks like a model-s/n type tag the way it has the white rectangular box beside the writing.
 
   / 2 Pt to 3 Pt Yanmar Tiller ?? #3  
FYI, you need a set of tines. If you get a look at some new ones , you will see what I mean. Those are used up. Go to the Yanmar site. There are several parts guys that sell sets.
 
   / 2 Pt to 3 Pt Yanmar Tiller ?? #4  
This is what I did. I used 1/2" plate with lots of weld. I used 1/2" x 2-1/2 x 25" long flat bar for the gantry (the top link mounts) they go from lower links pin to the top link, I had to bend them using a big heating torch (rosebud for the welders out there). I did this after tearing up the mounting lugs twice with a 35 hp jinma tractor. It's good and solid now. The tiller is a 58" Iseki. I also finally built a new tine shaft with flanges to take the KingKutter blades. I put a lot of $$ and time into it, but it does the work now. If you cut off all the old mounts and do it right with big iron it will last. If you try to cut corners, you'll have a folded up mess the first time you hit an obsticle. bjr
 

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   / 2 Pt to 3 Pt Yanmar Tiller ?? #5  
I just thought of something else. look at the input shaft on that tiller and see if you'll be able to match up a yoke to it. I just did a 50" Hinomoto tiller for a neighbor and the shaft was a Metric spline I think. It measures about 1.160" diameter and had 16 splines. I lucked out because it still had a coulper still attached and I used that to make a shear pin adapter. I had the coupler bored out on one end for a pilot align to weld a 1-3/8 smooth shaft stub (3" or so) with a 3/8 hole for a shear bolt. I then bought a 1-3/8" yoke, smooth bore, and drilled a 3/8 bolt hole for the non hardened shear bolt. This saved having to buy a $80 slip clutch. It's worked so far in sandy soil with a few smaller rocks mixed in. There can be some metric spline input shafts on some of the grey market tillers I found out. If some one out there has dealt with these shafts, tell us if you found a way to match to available PTO yokes. bjr
 
   / 2 Pt to 3 Pt Yanmar Tiller ?? #6  
Hi Ductape, I have almost the exact same 2-pt model Yanmar tiller you do (1202). I went a different route. I didn't want to cut and weld on the tiller, so I fab'd a sort of interface adapter that adapts from the 2-pt on the tiller to the 3-pt on the tractor. I bought one of those 3-pt hitch adapters on e-bay and modified that to adapt to the tiller from the tractor. The photos should tell the story. I also had to deal with the special 16-spline metric pto shaft on the tiller. For that, I had one of those 1-3/8"M 6-spline x 1-1/8"F 6-spline slip-on adapters bored out slightly on the 1-1/8" ID side to slide snuggly over the Tiller shaft, and then just welded it on. Now I have a permanent 1-3/8" 6-spline connection on both ends of the PTO shaft. It tills very well and doesn't move around. Not much money here, just some 2" angle, cutting, and welding work. I did draw it up on AutoCAD to get the dimensions right the first time. Now I could re-sell the tiller as either a 2-pt or 3-pt if I chose to.

Bill
 

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   / 2 Pt to 3 Pt Yanmar Tiller ??
  • Thread Starter
#7  
larso1 ..... i must admit, i had never even considered your approach ! What a great idea. I was thinking more along the lines of bjr's approach.... but this is why i love this sight. Two completely different approaches with the same basic result. As far as the shaft goes.... i DID get the shaft that was on the tiller. VERY short.... the fine spline on the tiller end, standard six spline on the tractor end. I figured i could rig up a workable pto shaft since i do have both correct ends. My only concern is ..... since there doesn't seem to be a slip-yoke in the shaft, i figure it must "slip" on the tiller end as you raise or lower the tiller? I have found that tines are available new, so that is no problem.

If anyone else has done this.... please keep the pics coming !
 
   / 2 Pt to 3 Pt Yanmar Tiller ?? #8  
Ductape, I too had the short shaft that came with the tiller. Problem is, it doesn't allow for much extension, the kind you would need with a 3-pt setup. The 2-pt pretty much pivots at a center, while the 3-pt travels an arc back away from the tractor. I tried to figure out how I could make the original short shaft work, but not knowing the size of the carden joints to try and adapt them to a standard PTO shaft joint made it unlikely to find a match. Without a detent on the tiller output shaft, your PTO shaft will pull right off as you raise the tiller. So the weld-on approach with a standard 1-3/8" 6-spline male end and standard PTO shaft was the only way I could see to make it work. Hope this makes sense. Glad you found the tines. Mine were in pretty good shape so I went with them.

Bill
 
   / 2 Pt to 3 Pt Yanmar Tiller ?? #9  
These are photos of the last project for a neighbors tiller. I didn't spend a lot of time rounding corners and making things pretty. He needed quick and cheap. He gotten some 2 pt to 3 pt adapter brackets that had been used with tiller that were mangle so bad I didn't try to straighten them. I hadn't got the shaft adapter back from the machine shop yet and so there's no PTO shaft in the picts. bjr
 

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   / 2 Pt to 3 Pt Yanmar Tiller ?? #10  
Ductape said:
Thanks to another member here, i was able to purchase a reasonably priced 48" Yanmar tiller (thanks Noah!). Problem is.... its a 2pt. I KNOW many of you have these tillers converted to a 3pt hitch ! Lets see some pictures ! Specifically...... i'd like this to attach to my I-Match hitch. Do these rigs have a shear of any kind, or will i need to add a slip clutch to the PTO shaft? Where can i get a few replacement tines? Can anyone read Japanese to tell me what exactly the decals say?

I have a Yanmar RS-1200 rototiller that I use with my Kubota B7510HST (21 hp engine, 17 hp pto). It came with a 3pt setup so I can't help you with mods to your 2pt rig. Maybe the photos will help you to come up with an easy conversion.

I could not find a shear pin anywhere on the tiller and the male pto connection on the tiller is splined. So I had to get a slip clutch and a shaft extension to keep the clutch from rubbing on the tiller sheet metal.

The pto shaft that came with the tiller had bad U-joints, so I bought a new one from TSC and cut it to fit.

The lower lift arms on the b7510 are only 26" long so I had to use the longer 35" arms from my MF-135 to get enough room for the pto shaft, etc.

Hope this helps.
 

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