Can someone identify this CCU please. Fitted to a D4 7j.

That would be a LeTourneau and should have tag like this on it but they were made by Heil Co. and Garwood Co. under LeT pattens durring the war

Looks to be a Model "R" LeTourneau adapted to the D4. Normally this unit would be mounted on a D7 or D8.

Thank's both of you, where can I find service and adjustment info?
Bob:confused:

The Power Control Unit instruction book I have covers the R, T, FTD7 and N series models. The form # is 0-139 (80 pages) dated 1942.

My copy is pretty ripe and I don't want to subject the binding to flat scanning but I can probably help you with specific questions.

The "R" unit would be found on the famous War II D7-3T and included in the wartime production service manuals.

Also would need to know the serial number, especially if it has a "A", "B", or "C" suffix code at the end of the serial number.

The manual is kind of messy to use as it refers to different models for portions of the service and repair information.

Thanks "old magnet", I understand your copying dilemma.Been checking EBay etc and have come up with a few possibilities.Aussie EBay has an item that may suit, what do you think? Item 270222428309.
Regards,Bob

That looks like a good candidate manual. Did you find the actual serial number on your "R" model?

One thing I always wanted to know about the military D4's, that had the LeTourneau dozer kits, PCU, ridge beam and blade, is that it seemed many of them were set up with a LeT single drum PCU and a hyster towing winch, (and probably ordered that way) how were both powered from the single rear pto shaft, somehow they had to work together.

They were mounted ontop of big winch and ran off the constant drive gear in the big winch onlt disconect was to release cluth that stopped PTO from complete unit

That is the one, looks like an N model, single drum, so that unit was designed to fit with the Hyster and they worked as one by use of gears, they obviously must each have their own separate controls, but are powered as long as the master clutch is engaged, something to always remember when firing one of these up. I'm familiar with the R7 PCU like on my D7, LeT must have also made a double drum model to fit a D4 without the towing winch,

The side by side ones that look like 2 R7's shown in their manuals, must have been fun to operate, those levers can be dangerous, I had one release once that would have clobbered me on the side of the head, this one had some oddball high seat instead of a factory one, so it lined up perfectly with your noggin and that spring sure has some energy to release, I'll bet it could seriously injure someone.