Small Hough Tire Loader

I just traded for this Hough loader. The areas by the radiator support have been ground on as they were retrofitting a V461D air cooled Wisconsin engine in it. The steering wheel and dash are also missing. I don't know anywhere else to look for identification on it. I have a couple of 'tinker' type problems. The first issue is you can't find the gears,(forward and reverse),when you do find them they are solid, just hard to find. I need to identify it so I can get a service manual to find and fix the problem. I hope I don't have to completely remove the front of the transmission to fix it. The second is more a question. Should there be a 'directional' valve on the hydraulic line on the left side of the machine or can it be eliminated(it's cracked)? Thank you in advance! Tim Submitted by Tim Clark, from MO