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According to that serial number, it appears to be a late 1H series D8, matter of a fact, 40 tractors before the next series started, the 8R series. Should be a 1941 model, as the 1H series was renamed from RD-8 at around S/N 1H1500 in 1937, prior to the RD-8, it was called a Diesel Seventy-Five. 9999 tractors were produced. The D-13000 series motor, naturally aspirated, slow R.P.M., was used in the 1H series D8 tractor all the way up to the 2U series, possibly the 13A series, which is when serious design changes started on the D8's. It should be 98 Drawbar HP or 113 HP belt/pto. It weighs about 33,000 lbs, add another 2000 for the dozer kit with the PCU and dirt in the belly pan etc. Also should have a 2 cyl 24 HP starting engine, probably a hand crank with the handle located down by the lower left side of the nose, great when you stalled out in the muck ! Same vertical cylinder engine was used on early D6's, D7's until the 3T's series ended in 1955 and the D8's including the 13A's before that was hcanged to the later type. Have to wonder if yours had the 2 spd transmission, which is real nice for cold weather start ups. electric start for these little starter engines were also nice. I would suspect that the Power Control Unit (winch) could be an R-8 LeTourneau model, for operating a dozer blade kit and also a towed scraper, where the both spools were needed, the blade was taken off or secured. Caterpillar did not offer it's own dozer kits until 1946, so LeTourneau, LaPlante-Choate and some others offered kits for these tractors, LeTourneau being the most prevalent until Caterpillar offered their own. Their are 2 other forums for antique Caterpillars, ACMOC and ACME. Photos are always popular, any O.D. green paint under the yellow, could have been a military tractor at one point. Aside from the dry type clutch maintenance, these were very reliable. A lot of people like the sound of the old 13000 and the D-8800 engines when in a push under a heavy load, lugging down, the latter 8800 is the same motor but in a 4 cyl. version, both had a distinct bark to em, one thing I enjoy about the old D7's I have.
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