Quiet-Close Kohler toilet seat lost its quiet close feature

The cams are worn out inside of seat or it may be to lose you have to tighten up the seat if there is any adjustments if not it is worn out replace toilet seat.

Thanks for the hinge number. It looks the same as mine. Of course my plumber wanted me to spend another bundle after 15 months. Now I need to find it in Canada

A lot of these slow closing toilet seats don't work well, so I suggest an alternative, Drop-a-Seat cushions. They stick on to the bottom of the toilet seat, allow you to drop any toilet seat, gravity does all the work, and the cushions absorb the impact. They're non-absorbent, stick on for easy installation (permanent yet removable), and are only $4.99. Check them out at www.drop-a-seat.com

Either live with it or replace it. The hinge is not serviceable and the soft close action does not last forever. They rarely last more than five years, maximum.

Replacement "hinge kits" are available here.

You need to replace or clean the 1150464 HINGE KIT http://www.kohlerserviceparts.kohler.com/AccessoriesInformation.aspx?ServicePartID=5563b058e2e042868c7a19398797ecd6

Sorry to read about your problem, I hope this helps you out.

Contact Kohler, and they will take care of you.
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this type can not be adjusted.

There is no adjustment for a slow close/quiet close seat. It would defest the manufacturers intent.

Call kohler they do have replacement cylinders