228D grounds-master seat suspension bad?

[Farming101]

Just got my used (1100hr) grounds master and the ride is really rough. Is my spring suspension seat worn out? Any thoughts on what kind of aftermarket suspension seat I could get? Thank for any input!

 

[mechanic mark]

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http://www.toro.com/golf/mower/trim/gm200/gm200_brochure.pdf

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