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Chipper Shreader Impeller removal
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Posted by rosemallow z7 Md (My Page) on Wed, Oct 28, 09 at 13:28
I have a MTD Model 494 chipper shredder, I need to remove the impeller. The bolts that hold the shroud are loose. In order to tighten them the impeller has to be removed.
Does anyone know the proper way to remove it? Or a easy way.
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RE: Chipper Shreader Impeller removal
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| Some impellers are built with threads in the center. It is a step larger than the bolt that came out of the crank. This is the best case for removal. You buy a longer/ larger bolt that threads into the impeller and it puts pressure against the crankshaft. It will either release or may need a whack. You may be able to hydraulically remove it in this way too.I'm unsure if all of these used that design w/ the tapered shaft. Be sure to look for set screws, but they aren't used on tapered crank models. I've had straight/ keyed cranks on some. Some have threaded holes that can be used to push from the crank. Certain ones have nothing at all to help. |
RE: Chipper Shreader Impeller removal
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The impeller looks very similar to my Troy Bilt (MTD).
I was able to borrow a large wheel puller. I used a sacrificial bolt in place of the bolt that holds the impeller, so as to not damage the shaft. You should be able to rent one from a tool rental store. The wheel puller has to be large enough to reach the outer edge of the impeller.
There will be a loud bang, and I mean LOUD when the impeller breaks loose from the shaft. When you are done tightening the shroud bolts, you just have to put the impeller back and tighten the bolt back down.
I had to replace my impeller about two years ago and have not had any problems with it since.
The issue I had with mine was the way the flails were secured to the impeller, the pins through the flails were held in with roll pins which were covered with a spring clip. The spring clip was not aggressive enough to withstand the rotational forces during operation. The spring pins flew off, the roll pins backed out, the big pin also backed out and the flails came loose and then self destructed the impeller. This happened twice, MTD finally redesigned the impeller assembly using locking bolts instead of pins. As I said I replaced the impeller two years ago and haven't had an issue. Anyway, my point is while you have it apart make sure that the flails are held in with locking bolts instead of pins.
Hope this helps. |
RE: Chipper Shreader Impeller removal
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Tomplum,
It worked like a charm. I did not realize it came off like a generator. I started to use a puller and got nowhere. |
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