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Discussion Starter · #1 ·
Finally got my snapper self propelled mower that I bought a couple months ago running again and used it for the first time this weekend. It runs great now that I rebuilt the carb and adjusted the valves, but I'm getting a lot of vibration and noise from the self propelled system and the noise is driving me nuts. Mine is a newer style model with the solid rubber driven disk driving the differential belt, instead of the old aluminum ones with the rubber band around the outter edge. Anyways, I ran the engine once I got it fixed up an and held some emory cloth to the steel drive disk on the deck with it running to clean all the rust off of it, so I know that surface is ok. I noticed that whats going on is the rubber driven disk is jumping up and down, not enough to affect the way the mower moves, but enough to cause the linkage to rattle and drive me nuts. It clears up if I press down on the rubber disk guard, or almost clears up if I'm in 1st or 2nd, when the spring has the most tension on it. There is slight play in the steel drive disk, as well as the bearings on the drive shaft that the rubber disk slides on, but no more than my old snapper mower, and it doesn't have this issue. So, I'm thinking its either the spring loosing its tension, or maybe the rubber disk is worn down to far. Is there a measurement for that? Any other ideas? The metal disk gets pretty warm to the touch after mowing my 1/4 acre, I'm thinking from the rubber disk jumping around on it.
 

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This has happened on every snapper mower I've ever seen...

Including the one or two I've been forced to work on...

I don't think there is any solution to the problem.. As the linkages age, They start to loosen over time... That's all I know.. and I'm No "Snapper Expert"

-Stan
 

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Discussion Starter · #3 ·
I have an aluminum decked mower of the same design built in 1978, and I've been comparing it to that. The play I have in all my bearings, drive disks, and linkage seems the same as what the old one has and yet that one runs nice and quiet. Thats why I was questioning either the spring, or maybe the rubber driven disc is worn down to far, causing the spring to put less tension on it and allow it to "bounce" up and down.
 

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The spring on the handle can cause that, so can a worn down disk. Sometimes the aluminum one will warp.

I replaced all the bearings on my 1988 walk behind about 5 years ago and its still going strong. But then again I use my riders/tractors on 95% of my yard
 
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