Sub Frames

[farmersamm]

Aftermarket loaders can be mounted in a variety of ways. Sharing the load between two points, or concentrating the load in one point.

Chances are, you'll be splitting the load between two points. Down pressure on #1 in the pic, and up pressure on #2 in the pic. It depends on the soup de joure.

Older tractors do not have substantial frames..........or dedicated points for mounting a loader. You're stuck with designing a sub frame.

The middle pocket in the pic(#2) has to resist a rotational force. If, and I say IF, you choose to mount the loader like a modern Deere. The subsequent loads are distributed between front, and rear, axles. Either by the tractor frame, or a sub frame. The moment is concentrated at the mid point pocket.

If you choose to mount a loader, as in the above pic of the old Allis..........you're relying heavily on the pins at the bolster. The circled #1 position. The #2 position is just resisting upward force....not taking the full load.......BUT TAKING A HEALTHY PORTION OF IT. This upward force is then transferred off to the rear, and front, axle.. But you're still mostly relying on the bolster...........remember that anything beyond the front of that tractor is a cantilevered load.

A loader is constantly trying to tear itself out of the mounts. It's a live load, complete with the associated stresses.

New tractors are designed for loaders.............the old tractors, mostly, are not. Pay particular attention to your geometry, point loading, and your sub frame.

And..........if you use the loader to its rated capacity on an old tractor........be ready to replace front rims. It goes with the territory. They can't stand the strain.

 

[moresmoke]

And..........if you use the loader to its rated capacity on an old tractor........be ready to replace front rims. It goes with the territory. They can't stand the strain.

I had a large Massey with an 895 Allied loader on it. Big, rated to lift 3 ton. I ended up making some custom 22.5 front rims.

Currently I have a Cat industrial loader. The difference is a farm tractor is powertrain components with a loader frame mounted to them. The industrial loader is a loader and frame, with a powertrain attached. Hence tge advice I gave in the currently running Belarus thread.

 

[Texgasser1]

And..........if you use the loader to its rated capacity on an old tractor........be ready to replace front rims. It goes with the territory. They can't stand the strain.

Good write up, I have a question, about the comment about front rims though.

We have used loaders on our our JD 10-20-30 series for years, with stock rims with no problem. Now maybe they are just not picking up enough weight to matter, don't know.

Also we don't use ag rib tires we use, low rib baler tires.

 

[caterpillar guy]

We have not had the front wheel problems but had some spindle issues in the past. I frankly like the loaders with the main frame running from the rear axle to the front bolster. This spreads the weight over the entire tractor rather than just the front end and bellhousing area. Ours does this by bolting to the rear axle and the brackets for each side of the bolster with the arms and bucket pinned on to there. Front tirs and spindles have been the issue with tires not holding the weight over time. Using 10 ply pickup tires on it. I like 10 ply nylon truck tires best since they seem to hold up best. We don't use it as hard as we used to since the cows have been gone for 30 years and the telehandler gets the bulk of the heavy lifting so that took a lot off the loader.