"Hdonly" wrote:

Yes, I knew about the CCU. I didn't figure I would overload it, dragging my Ford 651 back (in neutral). Just wanted to work it a little to loosen it up. It probably hasn't been unspooled in many years.

The older worm gear driven Model 25 CCU has a bare drum capacity of around 5,000 lbs. Most have been broke when the machines in load is hooked via the CCU cable and then pulling and jerking with the crawler. Your rolling truck would certainly not be a overload towing it to exercise the winch to get the crap and rust worn out of it.

#25 CCU's are gear driven. You'd have to go back to the 9Rxxxx series CCU to find the worm gear drive. Also the Ford 651 is a tractor, not a truck and that load would hardly phase the CCU.

Got to work a little more on the D6B. Cleaned and replace a couple of battery cable clamps. It reads about 25 volts when running so it appears to be charging OK. Is there any adjustment on the #25 CCU to slow down the speed of the blade dropping? It is really touchy. It hold the blade up just fine. It like just a little shot of ether when starting cold. After that, it fires right off the rest of the day. Is 7 lbs. of oil pressure at warm idle OK? It picks up to around 25 lbs. with some rpms. I didn't check it at full throttle. Gonna be raining tomorrow so I won't get to pull the dash and check on the throttle friction set up. Dang thing is too big to pull in the garage.

Oh yea, was anyone able to view my video on my facebook page? Didn't know if that would work or not.

"Neil" wrote:

25 volts seems a little low on a 24v system

Yes it is too low. That is just battery voltage and could even be higher if they were recently fully charged.

Charging voltage should be at least 27 but better 28, getting a little high at 29 and too high at 30.

That oil pressure isn't any too high, but probably will live a long time with that. The thing that gets them is if you get fuel dilution of the oil or obviously, coolant in it. On the D333 i would guess the most common cause of fuel dilution is a bad injector that someone keeps running. I think the fuel lift pump seals are drained by a little "tell tale" line to prevent a leak from reaching the oil.

I could not get the video to play by clicking the link.

I think the video I linked will work now. I think.

Hi Hdonly,
it matters not what year the tractor was built as Caterpillar only use exclusively Serial Numbers to give exact parts and data/information as they were/are always updating parts, specifications, and so data as well.

I will guess at a 37A but there were updates as soon as 37A 0938.
Low Idle RPM is stated as being 600 +/_ 10 RPM.
Set your engine RPM this specification--via the hand governor control if running slower than this spec.-- and then read your oil pressure with a gauge of known accuracy and report back.

I do not have dyno test data for these earlier engines, but, the next series engine--3306-- gives a minimum low idle oil pressure of 10 PSI with the engine and the oil at operating temperature, assuming that the engine is running with the correct grade and oil level/volume of undiluted engine oil, and this too would be considered serviceable in your engine as it is a lower stressed engine.

Hope this helps.
Cheers,
Eddie B.

as far as adjustment goes there is a manual that explains the procedure - it's pretty intuitive ( of course - after you see the manual)

there is a brake shoe in there on each side and a set of dry clucth plates . if the brakes shoes are oil soaked maybe they are grabbing ? also, maybe the brakes shoes aren't grabbing the drum in there ?

if you pull the side cover off you can see how all that works, clean it up. just a thorough clean up make make it all work smooth again. if you can find a manual even better.

The link worked for me. I think it dependents on if you are a Facebook member,which I am not but my wife is and we share the confuser.



A very good automotive machinist I deal with always comes back at me when i worry about oil pressure that 7 psi is enough for Chevy small block racing engine so don't worry. So now I worry if the old gauge is good and I really have a solid 7 psi.