Building subframe for YFL-240 + Refurbish for my YM240D

   / Building subframe for YFL-240 + Refurbish for my YM240D #1  

Jmlcolorado

Bronze Member
Joined
Apr 4, 2020
Messages
69
Tractor
Yanmar ym240
I picked up a loader that originally came on this machine. It was kind of a convoluted mess with all the parties involved.
The original owner still had the powder at his property. He had sold the tractor to a young boy next door.
The boys dad, however, owns an excavation company and the kid was quickly approaching driving age and had his heart set on a cummins truck. He began liquidating everything he had to save to the truck. That’s how I came about the tractor.
The previous owner did an extent job cleaning up this machine and making it nearly new again.
My only stipulation in buying the tractor was that he get the loader. The loader was 62.725% of the reason for buying a tractor to begin with.
Please don’t ask what the remaining 37.275% was because it’s complicated :)

About a month after I picked up he machine (covid mess didn’t help) I finally pushed the kid hard enough to get the loader.
This was purchased sight unseen and for $700. For the price, I couldn’t really let it slip away.
So I got the loader home, but it doesn’t have the subframe. Kind of a key component.
I tried to ask the boy, and his dad to reach back out to the neighbor to get the missing parts no no avail. I had already driven 2 hours 1 way, twice. Once to pick up the tractor. The next the loader.
I decided to cut my losses and just build one.
After lots of research looking at photos of how other loafers are mounted, I went to town.

This is a working thread. I started a couple weeks ago, and am back at it today. So this isn’t an all inclusive thread in one swoop. It will be updated as I make progress.

Last year, I bought 3 international school busses and made a dump truck out of one of them with a 1955 ford f600. That’s a whole other story in its own :)
I needed a gantry crane to lift the cab on and off the chassis while I fabricated mounts.

I bought a harbor freight crane for this as it was cost effective. The width, however wasn’t sufficient to fit the 8’ with chassis in between the rails so I promptly removed the original I beam, sourced a longer beam with a taller web to use.
So the original I beam got tossed into the scrap pile.
Turns out this smallish beam is a good size for the main support for the loader.

I cut the beam to length, then notched the center to clear the driveshaft.
I’ve seen mounts that go completely under the shaft, but I wanted to keep the clearance under the machine.
I am utilizing 4 mounting holes under the machine, as well as 4 on each side of the machine for a total of 12 bolts holding this beam to the machine.
I anticipate this to be more than adequate considering I haven’t seen any others that use all of the available mounting points.

Last weekend I made templates and cut two plates to use the side holes. Today I plan to weld those to the beam, competing this section.

Next I will work on the front mounting section.

I do have the diagonal tube that goes from the main tower, down towards the front but nothing else.
I’ve seen a couple variations of this design. One utilizes a tub that is either welded or bolted to the main tower, and goes horizontally forward to some kind of bumper mounting situation.
Others just use the diagonal to the frame.

I think I will use this horizontal brace as it adds another triangle and structure to the machine, and more is better, right?! :)

Here’s some photos. I’ll will update later as I make progress.



2A7C995D-CD8B-4DA7-B0C4-86E661782E8B.jpegA400A10C-C634-4988-8C46-1CDF77B44A2C.jpeg1F3646BD-A624-4F71-9655-32BB7E85D1C8.jpeg2D35F46D-8B76-4A9C-955E-24FDD9318E21.jpeg99A4BF07-9469-434F-BD3D-837F723A792C.jpeg2221F74E-3D8F-41DB-A242-D454D609815C.jpeg79A6425C-D304-4496-8AAA-EB73A48F509E.jpeg
 
   / Building subframe for YFL-240 + Refurbish for my YM240D #2  
I have a Yanmar 336d tractor with a factory loader. I think I have a factory manual also. Unsure how close in design etc. yours is to mine. I could take photos and get them to you but I will not get to the farm for nearly a week so that may be of little help to you.
I will be following your work/design with interest.
 
   / Building subframe for YFL-240 + Refurbish for my YM240D
  • Thread Starter
#3  
I have a Yanmar 336d tractor with a factory loader. I think I have a factory manual also. Unsure how close in design etc. yours is to mine. I could take photos and get them to you but I will not get to the farm for nearly a week so that may be of little help to you.
I will be following your work/design with interest.

I wouldn’t mind more photos of how the subframe is constructed. There’s very little out there and I’m working on just a handful of photos from other guys. It appears every loader is completely different so I’m always open to new insight.
 
   / Building subframe for YFL-240 + Refurbish for my YM240D
  • Thread Starter
#4  
I got the side brackets welded up partially to the main beam.
When I pull the main beam off the machine again, I値l weld the rest.
Doesn稚 make sense to do any overhead welding if I don稚 need to.

I shortened the main towers 5 1/2? The only reason I see them needing to be so high is for dump clearance on a truck. I have no need for that, and the towers being so high looked goofy to me.
Now they are the same height as the hood which looks better in my opinion.

I made 4 plates. Welded them together in pairs to clean them up, drill them; weld to the main towers and lower plates to the beam.

One plug weld in the middle will keep them together long enough to align everything and once I知 ready, I can just push on the tower to break them free. But then all the holes will be exactly in place even if my measurements were off.

Also, in light of working with a metric machine, I got tired of guessing thread pitch and count, so I made a couple thread check gauges. Both metric and standard.
I live 30 minutes 1 way from any hardware store, so it値l be useful to know what I知 shopping for now :)
 

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   / Building subframe for YFL-240 + Refurbish for my YM240D #5  
I will try to remember on the photos but it looks like you have it well in hand. You may be done before I can get the pictures to you. Looks like a beefy unit you are fabricating.
 
   / Building subframe for YFL-240 + Refurbish for my YM240D
  • Thread Starter
#6  
Got a little more done last night.
I pulled the main beam frame off to fully weld everything.
I must say, I think it might be a little overbuilt for what it is LOL.

It's quite ridged left to right, but is floppy front to back. That’s where that diagonal brace to the front comes in I suppose.
I installed the two bars that came with the loader. I didnt want to permanently install then with some fancy bracket, rather find where I think they should go and check clearances on everything.
I wasnt really sure where the main towers were originally placed on the machine forward to back, and one of the cross bars on the loader arm seemed awfully close to the bumper. I also wanted to make sure I had clearance for the hood to open.

Im glad I made this move. Where I thought the bars would land seemed good and very solid, but the steering knuckle conflicted with the left one. So they need to raise up, witch complicates the front bracket a bit.
Nature of the beast.

I’m still scratching my head on how to tie in the subframe to the rear.
Ive seen a number of sub frames just use bar stock to the rear. That just doesnt seem like enough to me. But I’m no engineer.
Also, where exactly to mount.
I could use the draw bar bracket. Or built some plate for around the axle.
I even saw one that basically bolted under the axle and the fender bolts went through it to lock the axle in. That one is appealing to me.

On to the photos!
 
   / Building subframe for YFL-240 + Refurbish for my YM240D
  • Thread Starter
#7  
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No sure why the photos s isn稚 attach to the last post :confused:
 
   / Building subframe for YFL-240 + Refurbish for my YM240D #8  
You have made some great progress.
 
   / Building subframe for YFL-240 + Refurbish for my YM240D #9  














I have attached 11 photos of the factory Yanmar 336 loader and a sheet from their loader manual. Hopefully that will be of some assistance to you.
 
   / Building subframe for YFL-240 + Refurbish for my YM240D #10  
Photo 8 might be of the subframe for the Woods 750 backhoe.
 

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