Looks like the only one that's missing is the HDT1000 which was for export only. It has a 3-cyl water cooled Mitsubishi rated at 22 Hp. The HTD did have a longer hood, but other than that and the engine, it was identical to the HT23.
Assuming that the 2388s was produced at the same time as the 2389s, which was the late model HT23 that was produced in 1985-1987, the one I have seems to be a 2388s as it has the Power Steering, Cruise Control, and Aux. Hydro cooler just as the 2389s had, and the same basic decal style which was used on the 1985-87 HT23.
My HT23 doesn't have the hydro cooler, or power steering, though it is a 2 speed transaxle. I got the K582 running pretty good,now, but, if I don't sell it, I know I'll want to put a diesel in it when the Kohler finally goes the way of the world. The Mitsubishi L3 series looks like a good fit-- 3 cyl, 18-2? hp depending on model, and only about 180 lbs.
I've measured the engine at a friends, and I'll need to extend the hood a little. I'm hoping to not have to extend the frame--just move the tank and battery mount forward, or put the radiator ahead of them and plumb back to the engine. I'll have to extend the hood at the rear of course, and also allow for the FEL on it.
Right now I'm planning to install a PS unit I bought that came off a JD 300 series. This uses the rod actuated valve, but the cylinder is separate from the valve, with hoses that run in between. Still not sure how to install it or where to tap into the hydro for the pressurized fluid.
Can you post some pictures of your HDT1000 that shows the frame, radiator placement, PS, hydro cooler, etc.? If you don't want to post them on the forum, you can PM to me.
Edited by Utah Smitty, October 02, 2013 - 02:02 PM.