D 6 clutch ( dry 9U )

herk

Member
Hello I had a bolt that holds one of the (links) inside of the clutch housing break, my book the pics
are as clear as mud, what dose that bolt screw into ?? can it be replaced without removing the upper
section of the clutch housing ?? any other thing I should do when I am in there ?? Thanks Bryan
 
Thanks for the reply, I removed the top cover , I did not like taking the fly wheel off the pony engine but it was necessary , the one bolt the nut that was welded to the link bracket the weld had broke and appeared to be bent, another one is also bent only on the side of the bolt head ( both are bent only on the threaded side ) any ideas as to how these get bent ?? also will links and brackets from any other models fit I think I know a 7 that has been parted out, one of the links has parts missing they appear to be plastic is this original or have they been replaced . Thanks Bryan
 
Sounds like something got caught in there, those are some stout bolts, the ones that hold the the fiberous like thick drive links to the flywheel and driven plate.

I don't believe the plastic parts you mention would be anything original from Caterpillar, I have seen these links made of similar materials. They are or were available, just not sure on pricing. I'd have to check part numbers to see if they are the same, it is possible. With a dry clutch like these, you do need to keep an eye on them every so often. I assume with the 9U and orientation of the starting engine flywheel they, access is not as easy as say the D7, but you should be able to replace those just the same, one at a time or if one is faulty. Its also imperative to keep the pilot bearing greased daily when in use, just not too much or of a type of grease that slings out easy, so it does not get onto the friction material of the clutch plates.

One thing that can happen if the pilot bearing is not properly greased, the bearing gets sloppy or eventually is destroyed, wallowing the hole in the driven plate, that eventually stresses these links, they start to rub on the housing and come apart, I've experienced that once. I'm not sure what tolerances it would take with a pilot bearing beginning to wear, but if that assembly is out of balance, beyond tolerance, those links will have more stress on them.

The other thing to consider is that the clutch assembly, driven plate if you will, (this is clearly shown in the serviceman's reference book) must be aligned axially and radially to the engine flywheel, that too could cause a problem with the links, if you think about it, they are on the outside of what spins, so if they are not aligned within acceptable tolerance, they will have more stress on them and are likely to fail when they rub, get hot and start to come apart.
 
When the small bolts bolted to the plate are loosed the shackle bent and come out from the big bolt the D7 links will not fitt on D6 and the nylon link are later on and the hurley one was rubber belt and am still have 4 new off them and some shackels and bolts too and if the bearing in the plate is bad this could give some trouble and the greace fitting is on side plate
 

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