Question about Troy Bilt Tb70ss Gas Trimmer

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I have a troy built tb70ss trimmer. The fly wheel is not grabbing onto the shaft. So when i pull to start it doesn't turn the engine over. I took it apart and it looks like there should be a metal block to hold the flywheel in place. The trimmer was used one time. I see no block but maybe the flywheel was supposed to have a part sticking out instead. I looked up on the part list and saw no block. Does anyone know if there is a piece sticking out of the inside of the flywheel to hold onto the shaft? If there is supposed to be i just need to buy the flywheel. Thanks

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I have the same trimmer, the original flywheel has the shaft key built into the flywheel. The built in key has shreared off, this can happen if you hit something or their may be a bigger internal problem. Look for replacement flywheel that uses a seperate key that is not built into the flywheel. Replacement key are far less expensive than replacing the flywheel.

Posted on May 25, 2010

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Usually there is a nut on the end of the crankshaft. there shoud be a long piece that the square shaft fits into and the nut is behined that in one piece and there should be like a half moon key that keeps the flywheel from spinning on the shaft.

Posted on May 04, 2010

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