Spring Washers

[ken572]

(ALL)

Schnorr – Handbook for Disc Springs.
http://schnorr.com/docs/Handbook.pdf
and
http://www.schnorr.com/downloads.html
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Bellevilles
http://www.keybellevilles.com/apps.html
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Fan Disc Corporation
http://www.fandisc.com/
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Lee Spring (All Types)
http://www.leespring.com/int_belleville_wash.asp

Ken.

[wsippola]

Thanks for the links. I used to have a Case 2290 tractor that had a power shift transmission. It started to fail and would not engage reverse and a couple forward speeds. The main problem (there were several issues, and this tranny commonly fails ) was caused by a Belleville spring. There were several springs stacked back to back in a hydraulic clutch pack, used to cushion the shift (at least I think that's what they were for). One spring broke up into small pieces, and every time that clutch pack shifted, a broken piece of spring would take another bite out of the seal and piston.

The parts came out to about 600, which wasn't bad. Took a week of after work effort. Going price for the tranny rebuild at the dealer was 12K, which was about what the fixed tractor was worth. I suspect the Belleville spring was a little too hard, causing the eventual fractures.

The differential and the final drives also gave problems on this tractor. At least it did have a very good engine.