I bought the Service Manual off of Ebay and its got a Maintenance Manual in it. It's not the OMI
but it might be what we are looking for. The serial number is higher than mine. I'll try and get a pic
of the front and see what you think.

Update
We filled the hydraulic tank with oil and never seen any change in the sight glass.
Fired it up and hydraulics work great with no noise. Then we adjusted the right clutch
{ran the nut out a few turns until the throw out bearing yoke was loose. Right steering clutch
works!!! Now everything on our $4500 purchase works!
I took it in the woods behind the house to test everyhing and the first thing that I pushed up
was a rotten pine stump that has a healthy yellow jacket nest in it! Reverse and 5th gear works
great also!
Now we will start dealing with several worn linkages. Will keep y'all updated.

BTW I killed these two Timber Rattlesnakes about 15 feet from where 
I was crawling under the dozer and working on it! They were mating.

The only good buzz tail is a dead one!!


Glad the D4 is in working order.