I recently bought a 1970 R700 Dump which my son is using almost daily in a small excavating business. I have a few questions. Tag on the side says R700. Tag on the door and on the right frame says R685-ST-9964. Is there anyplace that lays out all the model numbers and what they mean? I've seen references to getting info from the Mack Museum. Is the best thing to do just call them? I believe it has a 237 with turbo. It has a replacement Eaton? 13 Speed transmission, Camelback suspension. The front drive axle is labeled Mack. The rear looks similar but isn't labeled Mack. I has an alternater, but it is positive ground. I believe it's pure 12 volt. I haven't seen any indication of a 24/12 relay. I would like to switch it to negative ground to simplify the problems with hooking up a new skid steer trailer. Alternater has two big posts labeled + and -. I would think I could just switch them. Might have to switch some gauge wires. I've worked with old tractors and I don't think switching it would be a big deal, but I'm wondering if there are any gotchas. Is there anyplace to get some beginning manuals. For example, there is a bit of a leak between the front and main housing of the Mack rear end. It would be nice to have an explosion pic of the rear end. Thanks in advance.
