Oliver OC-4 Transmission Needed

[Sandcassle]

I took my machine apart and removed the transmission due to the lack of reverse. When I got into it, I realized this thing is worn completely out! It must of been ran with lack of lubrication for a good while. Most of the gears and the bearings are worn beyond being usable. I tried Zimmermans and they have the parts alright. I just can't justify spending 1000.00 or more on this machine. Any ideas would be much appreciated! Otherwise, I may have no other option than to part the machine out.
Thanks, Roy

[Robert Barbour]

First were are you located??  That transmission and diff use a match gear set for the ring and pinion, so be sure to get both parts from the same tractor. Also if it is a 3 cylinder machine it could have diff steering or the spot turn system which is clutch and brake style.  There are people with used parts, but it helps to know were you are as shipping is expensive!  For the bearings on the pinion shaft you will have to go to Zimmermans.

[oliverchris]

Those rear ends are not so easy to get a hold of, in my experience. I get calls for them all the time, and the only one I have, I am keeping for myself.
As Robert says, check which one you have, as there's a few variables in the differential re. spot-turn, clutch-turn or just plain-Jane differential-steering on early models. I heard the other day that some Snow Cats used the same Clark differential as in some OC4s (Imps and Sprite models, perhaps?).

[Sandcassle]

Thanks for the replies! I'm located in Central Arkansas. This is a 4 cylinder machine with 4 forward speeds plus reverse. I can't tell you much about the differential steering other than it steers with the levers only (no steering brake pedals like an old Cat dozer I've operated). It has 2 steering bands, which puts friction on 2 drums on the differential. This may be the older model OC-4, since it has the rounded front grill. The gas tank is under the seat. I'll post pictures.

Thanks again! Maybe I'll get lucky with these parts.

[Sandcassle]

Here's a picture of my OC-4.

[Robert Barbour]

The 4 cylinder machine was the early machine and they are all diff steering.  The diff steering from the newer 3 cylinder machines will fit but the spot turn clutch type system will not.  There was changes made to the housing for the sport turn system that the early machines did not have. The spot turn also uses different axles so you would need those too convert.  I like the diff steering better anyway.   Don't know of any one close to you.  You mite try Crawler Heaven, they have a web site just google that and it will come up.  They are in New York.

[hotratz]

Those grills are pretty rare in any kind of condition 

[Sandcassle]

Does anyone know the Clark model number of the 4 speed transmission in my early OC-4? I might be able to find this transmission on some of the other brand machines mentioned in the previous replies.
Thanks, Roy

[Robert Barbour]

Yes Clark made equipment for a lot of different companies, and often it was customized for that application.  I would stick to looking for OC 4 parts that way you know it will fit.  If you get something from another machine you don't know what little changes may have been made.  Like maybe the axle spline count is different and you axles don't fit.  That would not be nice to find out after the unit is installed in your machine!!  In my Jensales Yellow pages book there is a used tractor parts place in Aubrey Ar, Bennett Tractor Parts Inc. 870 295 6059. They may be able to help or maybe know who might if they can't.

[Sandcassle]

After careful consideration, I have decided to let my OC-4 crawler dozer go to the right person. I would prefer to sell it to someone who appreciates the Oliver/Cletrac machines and who intends to fix it up. Thanks for the help received on this discussion and I'll soon be posting it for sale in the classifieds section.
Thanks, Roy