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I have a Craftsman 6.75 MRS Briggs 21" Hi-Tunnel mulcher. Front gear drive variable speed. Model # 917.378922. The self propel only turns the right front wheel, the left side won't pull. The gear and wheel look OK inside, nothing stripped out etc. Any suggestions/common problems? Thanks!!!!

I was looking at the parts picture. It looks like a straight drive axle, both wheels drive on one axle. So the only thing I see would be the drive pawl on the left side would be not driving?? You will have to take things apart and see what is broken or wore.

reynoldston said:

I was looking at the parts picture. It looks like a straight drive axle, both wheels drive on one axle. So the only thing I see would be the drive pawl on the left side would be not driving?? You will have to take things apart and see what is broken or wore.

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Thanks...I'll check it out and post result

You were right, it was the little drive pawl. It was on the axle behind the wheel, not in the transaxle housing like I first thought. I took off both wheels and one side was rusty, the other looked OK. A little prying got the rusty one off, some 6 in 1 Belray spray and some anti-seize took care of the corrosion. It "burns rubber" on both sides now! Thanks again for the tip!