Thread: 1949 Cincinnati No.3 High Power 4J3P1V need help.

I recently came across a Cincinnati No.3 that needs some major repair. Machine is not feeding due to a jammed hydraulic drive shaft. I'm having trouble looking for the correct manual and so far all the manuals that I have found has a different overarm compared to mine (see attached pictures). If someone can point me to the correct manual I would be grateful. Also I found two disconnected pipe fittings on the underside of the knee in feedbox compartment, as shown in the attached pictures. Anyone has any idea what these are for?

More pictures...

I think the powered overarm is something of an accessory. It would have its own manual. This one may help for overarm:

http://vintagemachinery.org/pubs/2097/15295.pdf

While the parts and service manual are combined here, for #2, #3, and #4 dial type:

http://vintagemachinery.org/pubs/2097/22565.pdf

If you look on the first real page of the manual (the one after GS10) you will see it applies only to 2A and 4A serials

Originally Posted by johnoder

If you look on the first real page of the manual (the one after GS10) you will see it applies only to 2A and 4A serials

Good eye, good eye !

Here's a service and parts manual for 3J and 4J on ebay, 191 pages:
Cincinnati Milling Machine # 3, 4, 5, & 6 Mod OD Service and Parts List Manual | eBay

Wow that's a good find on that over arm. Unfortunately the owner replaced the geartrain removed with an inverter.
The 4J manual on Ebay is a hard hardcopy version though, is there a purchasable soft copy somewhere though?
On another note, does anyone know what's the HP on the rear bottom motor that drives the main pulley? I've read on this forum it could be anywhere from 20-50HP. That's a monster of a machine if that's true. Also can anyone confirm if the main hydraulic shaft is supposed to turn on motor start up?

Originally Posted by newcomer

I've read on this forum it could be anywhere from 20-50HP.

A No 2 is like 7.5 to 10hp. I was thinking a No 3 would be 10 to 15hp.

Looking at these 3 brochures, there are No 3's with 10, 15, and 20hp.

10hp:
http://vintagemachinery.org/pubs/2097/16338.pdf

15hp:
http://vintagemachinery.org/pubs/2097/16339.pdf

20hp:
http://vintagemachinery.org/pubs/2097/16344.pdf

If the external power rating data plate is missing, maybe the motor has a data plate.

anywhere from 20-50HP

For what its worth - the most powerful #3 K&T in 1957 was 30 HP - but the "ram" (fancy overarm) had but 15 for the main

Not exactly applicable since you have the HEAVIEST #3 made that year by CMM

Just that king size knee says that

The nameplate is located in such a tight space that I'd need an endoscope to read it. The owner is considering to replace it with a new machine but nothing seems to come close to that 70 years old machine in terms of power. Not for a big sum at least. I'm kind of tempted to buy his #3 but that torque destroyer VFD conversion puts me off.

My #4 machine is 25hp on the main spindle 7.5 on the independent overarm.