cat made the 4r/5r series of d6's from 1941 to 1947, then they introduced the 8u/9u series that ran from '48 to '57 i don't know the exact serial number for the switch to the wet clutch but it was in the 13xxx range i believe . there were about 26000 9u's made in. there were multiple parts manuals for the 8u/9u series , depending on publication, some where from 9u1 up and some said 9u13xxx up, the service manual you have should be from 53 which would be a close year to when yours was produced, 9u 6xxx was still in 1951, and i believe the wet clutchs came in in about 1954. there are many more people on here that know a lot more about this than i do , and i would welcome any correction if i have made errors.
the 9u's in my opinion are a very good machine, well balanced for power and size, small enough to cart around without to many permits or really big trucks and trailers. they are relatively simple to repair and are very durable if you ar doing d6 work. if you are trying to do the work of a d8 then you may run into issues.
there are considerable differences between the 2h machines and the 4r/5r, 8u/9u machines. the 9u's had steering boosters, 6 cylinder engines, hard noses like yours has, cat ccu's and cat blades, any blades i have seen on the old 2h's are made by laplante choat or letourneau, horizontal even fire ponies vs vertical odd fire ponies, oil coolers, etc.
lol That cabs about useless unless you want to hang your shirt to dry and that light! oh my! lol jumbo cup holder??
lol That cabs about useless unless you want to hang your shirt to dry and that light! oh my! lol jumbo cup holder??
Looks like the remains of an old style wood and canvas top. I always thought they looked cool, but I know I could never keep one on a tractor here.
The parts book says 9u 13263 -9u29764 on the cover. The change to oil clutch was one of the bigger changes,but there maybe other things as well.As has been said very common to have the oil clutch fitted to early tractors.
Did any after market suppler make a change over oil clutch kit that you didn't have to change the top shaft in transmission as well?
Our channel highlights machines from the earliest Holt and Best track-type tractors, equipment from the start of Caterpillar in 1925, up to units built in the mid-1960s.
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