Good day everyone. 3T D7 # 20616. Was hoping to have startup after replacing transfer pump seals and o rings.. instead I’m hoping for advice per the ccu. In cranking to remove air and prime I noticed the blade was rising. The lever is totally in disengage position. I was able to push it down one time slowly and with downward pressure from front end loader. Started cranking again- it began rising again and now doesn’t lower at all. It is a front mounted winch not operated from rear. I have adjusted it once a few years ago and changed the oil in it. Thankful for any experienced memories of ccu’s that’s still out there.

Clutch discs may be sticking since it was adjusted up awhile back.

D68U here does that if it has been sitting for a while. If I slacken adjustment it will be too loose in no time. I just let it rise to full hieght and it frees its self up in a very short time and all is well.Occasionaly it wont go down unless I stop the engine but a couple of cycles it gets the message. I blame rust on the plates makes them drag untill polished. You need to use it more.

I was thinking probably the clutch was seized. I’ve heard that over raising could cause problems and have always been cautious to not get it too high. My manuals haven’t any front winch ccu info even tho my serial # is included. Is the service man’s reference library available? I can crank engine to continue raising as wimmera suggested just don’t want to overextend the cable.. much thanks to you all… input is appreciated..

Early ccu's had a right-hand thread on the spindle nut, the adjustment in the center of the spool that you see from the front. Later ones had a left=hand thread. This is because, if that clamp fails to hold that nut from turning, the friction inside the drum will cause it to self-tighten and everything goes up in a hurry when it becomes tight. If you are working it, diesel running balls out, the whole picture, that blade will go up. totally out of control, and you will have to shut down the engine while your friction disks are going up in smoke. If you have the later spindle with left hand threads, the blade just goes down and stays there. Merely inconvenient. Last time I saw this happen they crawled out on the hood and cut the cable off at the wedge. It is dangerous to do this; that free end with the blade pulling it out of the blocks, goes wilder than any bull whip you ever saw and could take a hand off I imagine, or worse.

I would think that you could kill the engine, block the brake in a free mode, open the compression relief, and run the ccs out backwards by pulling the fan blades around in reverse direction. Anybody out there tried that? I haven't lately found myself in your situation to give it a try.

And again and always: Don't ever work on a raised or running dozer from between the hard nose and the blade or C-frame. There isn't enough room and it will kill you sooner or later.

Good luck and stay safe!

Should have added pilot motor does not have enough power to harm the winch or cable. If blade goees charging up with diesel power real problem coming quickly.
cheers WF

This cat has a electric start. I can turn motor over only enough to fully raise blade. I’ll probably try WFarmer way of unsticking his ccu. He’s the only one that’s had similar issues thus far. Hopefully the starter won’t over raise the blade.. I can try to reverse pull engine manually to lower it back down per Jack’s thoughts.