40C weighs around 4600 lbs. Ground speeds 1st - .8 m.p.h., 2nd - 2.2 m.p.h., 3rd - 2.9 m.p.h., 4th - 5.3 m.p.h. Drawbar horsepower - 15 , PTO or belt horsepower - 23.5 belt. Engine size - 101 cubic inches. OC3 or HG weigh around 3600 lbs. - Ground speeds 1st - 2.01 m.p.h., 2nd - 3.19 m.p.h., 3rd - 5.24 m.p.h OC3 - 20 drawbar horsepower, 24 belt horsepower. Engine size 132 cubic inches. There are plusses and minuses to both. 40C Deere is heavier built, has an overhead-valve engine, weighs more and will pull/push more. Also has a very usable low first gear for dozing. Deere-specific parts can be very expensive and the powertrain is unitized which can make it somewhat harder to work on. Cletrac HG or OC3 is lighter - so it is easier to truck but won't push or pull as much as the Deere. It has a bigger engine and more horse, but is geared so high in first gear that it's too fast (and light) for many dozing jobs - unless it has the optional auxillary trans. which brings the ground speed of low-low to .6 m.p.h. The original 3 speed transaxle is a Clark unit and is used in many other machines (e.g. Case 310, Terratrac, BF Avery wheel tractor, etc.). Engine is a Hercules flathead, and some engine parts can be scarce. Drivetrain is not unitized, so it's easier to do certains kinds or repairs to. Many parts are generic and easy to get, and most of the rest are generally available new, reproduced, and/or used. They are both good machines, but the Deere is certainly has more rugged design. Keep in mind that the Oliver Cletrac HG/OC3s were originally designed more for row-crop farm work than for pushing dirt. Oliver didn't get serious about the industrial application of the small crawler series until the OC4.
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