I have the same problems as others with the seat in a Grand
L3430 cab model. I searched the archives and didn’t seem to find any solution so I decided to tackle it myself.
I made a set of risers for the front out of ¼” X 1” aluminum. Steel might even be better but I had this in stock and works easier. I drilled holes at 1” increments so it could be adjustable from a 1” rise to a 3” rise. I drilled another set of holes into the original seat brackets and also machined a couple of “washers” to fill the large holes in the original seat brackets as well to keep them from being sloppy.
The installation went fine except for the “safety” switch (?) located under the seat would not longer work correctly when the seat is in the down position. For the time being, I have tie wrapped it closed until I figure out a better solution. Don’t really know what this switch is for but figured it must be closed to work.
Also the modification requires some trimming of the plastic seat bottom to allow the extra bracket.
I have it set on the 2” rise right now and that seems to work just fine. I’ve got the option of changing it either way with a quick loosening of 2 bolts. The ¼ aluminum is just about the right thickness. Any thicker and the original shouldered bolts wouldn’t work.
I was worried the aluminum wouldn’t be strong enough but seems to be holding up well.
I don’t know if the other seats are similar but at least this works on this model.
No more wedgies!!!!