Oliver plow help

I recently purchased an Oliver plow. The plow is red I haven't taken time to see if there is another color under the red. I thought it might be a Plowmaster but the frame pieces are all straight, not bent from the top frame around to the plow lay. I started looking again and now believe it is a 42_ _ or 43_ _. I have read that the first number being 4 means it is a pull type. Can someone explain what the rest of the numbers mean?
The plow is old enough to still have the rooster comb hub on the landside but the plow has been converted to hydraulic lift. Most of the plow has been painted red except the wheels and the framework for the hydraulic lift which are green. I will try to post some pics when I get time. I found some manuals online for the 4240 and 4340 and can't see much difference.
Another question was the spring loaded hitch an add-on? The manuals show a standard hitch (no safety quick release).
Thanks for your help
John Schoenauer

I just renmembered a couple of other things. 2 other plows on the sale were green. The frame parts were the same but the red plow has more clearance, about 30 inches from the bottom of the lays to the top of the frame.
Thanks
John Schoenauer

The rooster comb lift was available on the 4240 plows and I think 4340 (I haven't looked at the parts book in a while). We have a 3 bottom that was converted to hydraulic but we converted it back. I also believe that it may have been available on the 4440 (tube pull type plow) based on what I've seen in the parts book but I have never seen one.

Do the bottoms on your plow trip back bottoms? That would tell me that is is definitely at 42- or 4340. Also, look at the back of the moldboards and see if you can see a number like 219, 419, or 619.... stamped in them. It isn't a perfect system but could give a general idea of the age of the plow.

The hitch you describe sounds like the one that is on our 414 which was painted red. However, that could have been added by someone. Someone could correct me if I'm wrong but the later plows could have been sold under a different brand and painted a different color. We have an newer fully-mounted plow that I thought was painted red, at least we painted it that way. I am not sure what is was sold under. The main difference between the 42 and 4340 is the 4240 is a 2-3 bottom plow and the 4340 is a 3-4 bottom plow and it used tapered roller bearings in the wheels instead of the brass bushings that are in the 4240. The difference is easy to tell in a 3 bottom plot since the 4240 has longer wheel hubs. I'm not sure if one will lift higher than the other.

DKaiser The bottoms are not spring loaded trip back but could have a shear bolt trip. The wheel hubs are long and I would guess they have bushings because there is a lot of endplay now, that I have to work on.
Thanks John Schoenauer

If it was originally red it likely was sold as a Minneapolis Moline and should be the same as the 4240. I'm not sure if the Moline models used a different number or not. We just bought a later style plow similar to an Oliver 450 that was a Moline which looks like the same color and I've seen 4440 tube plows sold as Molines and are red. The saddle for the hydraulic cylinder and the trip hitch would have been a later add on. Not sure even with the bolt trips why the need for the trip hitch but that style would have interchanged.

Thanks DKaiser I was wondering about the plow being sold under a different name. I have found a place that has several Oliver plow manuals that can be downloaded in PDF format. http://www.archive.org/ use the search.
John Schoenauer