I have find an interesing video today, a small crawler grader from Tri-Track International Ltd.: https://www.youtube.com/watch?v=GPUkHF0rigo Have someone seen those type of grader the last time?
That is unique!
Company was dissolved and also patent lapsed in 2012 due to unpaid fees, not sure what happened there. Looks like a hell of a machine.
Has someone see the machine the last time? Sad that they dissolved, but I think the machine is still existent.
It really wasn't a grader, it was a snow groomer, especially for snow machine trails.
It was a grader, it has a blade in the middle, that makes the difference of a real snow groomer. You can use that for earthmoving and snow, see the video, it is a grader!!!!!! The Mauldin MG 618 has not all common grader blade functions, but it is a grader too: http://www.4amauldin.com/service su...oduct_Literature/MG618_Product_Literature.pdf
Looks like a Kassbohrer with a grader attachment. Looks like an expensive way to do what a standard Kassbohrer could do.
With the blade in a middle it is better to clean up bumps/uneveness than when the blade only at the front. The blade in the middle is the reason for what graders are built, so this Tri Trac grader is an interesting type of. The person who built this has written here informations: http://s8.zetaboards.com/snowgroomingtalk/topic/8030964/1/
I have find two new videos from this grader:
It's a neat idea, but I wouldn't call it a grader. That unitrack in the front would make it really unstable. To me it is a bombader with an attachment on the front.
All what a blade in the middle is a grader for me. This track grader needs a bigger/longer frame, more weight on the front or two tracks, then it is more stable on front i think.
Here are some pictures, Copyright Labbe Heavy Industries: