Toilet lid not closing quietly. It drops down quickly like most toilet seats and makes a slamming sound. If I push the entire seat assembly to the left, it works as it should-quietly and slowly. But, eventually it moves back to the right. Has a seal come loose? Can I correct this? How? If I push the seat down manually to close it, does this damage the Quiet Close feature? This seat assembly is less than a year old.

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

WOW! Slow-close toilet seats. What will "they" think of next, to pick your pocket?

Slow-open mechanisms such as cassette players and top-loading DVD players use a special type of grease to achieve that effect.

The screen on the laptops uses a friction mechanism based on a "clutch-spring" with enough holding power to keep the display in the position selected.
This "clutch-spring" is factory adjusted so it neither slips under the weight of the laptop screen, nor is so tight that extra force is required to close the laptop.
These things do wear out, and as a rule are not user serviceable.

Can you adjust it? Good question!
Can you adjust it so it works? Ahah!
My rule of thumb: If it's already broken, how much more broken can it get?

Therefore, my conclusion is that the toilet seat's slow-close mechanism is factory set at the point where it will neither slam down nor stop half-way, but glide down gently until it's closed.

An interesting added feature would be for the toilet to recognise who's about to use it, and for what, select the seat position be it up or down, and then regulate the water volume needed to flush.
Also, it could flush itself once the lid is fully closed, to avoid or minimize the dreaded "toilet flush mist". arrrghhh!!!

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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.

I don't believe it is adjustable -- you'll probably need to replace it.

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

Hi, Please don't take this the wrong way but did you install the hinges the right way? I fit bathroom suites for a living and have done this a few times wrong by putting the left hinge on the right side and vice verser. Sometimes the instructions are not very clear in explaining which side is left on the seat, as a result even though the toilet seat is closed, the springs are set backwards and are in fact in the up position. Double check the instructions once more, and just have a look on the hinges and seat because sometimes they have a small 'L' sticker on the hinge and an 'L' sticker on the seat and lid to correspond which hinge goes on which side. Hope this is of help to you.

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

Call kohler they do have replacement cylinders

It needs a new air shock on it. You might be able to take the old one apart and fix it but replacement would be best.

Hello len_moon, Look under plumbing in your yellow pages for a Kohler distributor. Also here is the web page for you part numbers. You will need the hinge assembly. Copy and Paste to your address bar. Hope it helps!
http://www.kohlerserviceparts.kohler.com/ServicePartsPage.aspx?DocumentID=c83b1f213d0545f984b01b9f0be37b9d&ModelID=558da26604ce43ec98c83fe8ed0aa604