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I recently put a MH22 engine in my OC4.  The original was trash and I didn't want to spend the number of dollars it would take to rebuild it.  In looking for something that would fit in the HP range, I decided that a frame tractor like the MH, Allis Chambers, Olivers would work the best, rather than trying to adapt to the Cletrac bellhousing.  I ended up using the MH engine and bellhousing.  It fit within the frame with newly fabricated engine mounts.  Even used the original radiator.

I seem to recall that when or if you wanted to reverse the direction of a Volkswagon beetle transaxle you had to open the case and reverse the gear. 

I think it's an earlier OC4 that came with a 3 cylinder Hercules.  There is only one gearbox though.
I think I know whats wrong.  I opened up the rear differential cover and it seems that the ring gear is on the right side of the case.  The manual I have shows the ring gear on the left side of the case.  That would reverse everything.  Now I just have to pull the final drives off.

Hello all.  New to this group though I have looked for answers about my recently purchased OC4.  I bought it with a stuck engine with the assurance from the seller that it had lived under a tarp.  Long story short, after soaking cylinders for a week I took the head off to find water in all the cylinders.  Ok I thought, more soaking, tapping, heated oil soak, more tapping, more oil soaks etc for about a month and a half.  Finally broke the pistons out.  Engine needing parts I found that about $1400 would get me parts to which I thought I couldn't justify that.  I decided to look for a transplant which I found in a Massey Harris 22 engine which is a Continental  140cu in.  I installed that using the bell housing.  It fits nicely with some welded engine mounts.

A very long story short, I started it up this past weekend to move it under cover.  Much to my surprise when I shifted it into reverse to back up I went forward.  Huh? I shifted it into 1st and it went backwards the same was true with all the forward gears.  The engine turns in the same direction as the Hercules.   My question is does anyone have any idea what is wrong?  A clue might be that when I got the machine, the differential cover was held on by only 2 bolts