Re: More MU-2 madness...


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Posted by David Sherman [216.18.131.122] on Sunday, February 28, 2010 at 19:48:05 :

In Reply to: More MU-2 madness... posted by Jon Kelly [98.197.106.42] on Sunday, February 28, 2010 at 19:26:58 :

It's not real clear to me what you're doing. For example which way is "forward" when you say the shaft moved "forward"? I'm also not sure why, in the picture, the housing cover is still on the end of the shaft. Is it stuck on also?

If I understand correctly, you're trying to remove the shaft with the big gear attached out as one unit through the open end of the gear box, by sliding the whole drum length of the shaft back through the housing. If so, and it's binding up, it maybe trying to tell you that your shaft and gearbox bushing are still in good shape and don't need to be replaced, but there's some rust on the shaft, burrs on the sliding clutch keyways, or some other slight thing that's binding on the not-at-all-worn-out housing bushing. What I can see of the brass gear in your picture doesn't look too bad (at least nowhere near as bad as mine), so I'm starting to wonder what you're trying to do here. Does it really need complete disassembly and rebuilding? Maybe the only problem was it leaked oil out of the input shaft seals, which you can change without tearing it down any further. The only reason to take it apart further than you have is to replace the shaft or the big gear. Do you really need to do that? If so, have you tried pulling the brass gear off the shaft from inside the housing? Mine was a pretty loose fit on the shaft and came off easily. I hope you're not trying to drive the shaft through the housing in the inboard direction, because if you are, the keys are hitting the inside of the housing. The only way to remove those keys is to first slide the gear off the shaft.

There is no way it should need the application of a torch or severe beating with a hammer. If you really do need to remove it, and you really do need to push the shaft through the housing in the outboard direction, then figure out where it's binding. If you push it back the other way, you might see the spots on the shaft were it bound up. If there's any rust on the shaft or any burrs you can feel, clean it all up with emery cloth and a wire wheel, put some oil on it, and try again, rotating the shaft while pulling. Rotation does wonders for unbinding shafts that are stuck in tight bushings.



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