Lowes or Home Depot will have replacement handles and valve core assy. Sounds as though the core assy is poss broken.
The bottom half of the handle spins CCW to losses the handle from the body. You can then tighten the screw inside the handle.
SOURCE: how to take handle off of Grohe Lady Lux Cafe-took screw out-handle is stuck
I soaked the connection between the handle and the valve body in a penetrating oil for several hours and eventually used more force than I hoped to use to remove the handle. Once the handle and end cap (part 09 209) were removed, I could see that the valve assembly (part 46 048) was loose which caused water to leak from the seals (part 46 209) between the valve assembly and faucet body. So I tighted the screws that hold the valve assembly to the faucet body and the leaked stopped.
SOURCE: Kohler Forte Single Handle Faucet Leaks
you will have to replace the ball assembly with a repair kit
1 turn the water off under the sink (hot and cold)
remove the handle ( you may need an allen head wrench to remove a hex screw or you may have to take a channel lock pliar and unscrew achrome
nut over the ball mechanism
after the handle comes off there is usually some type of lock nut that you must remove to remove the ball mechanism
remove the ball (usually chrome or brass(ther are usually little springs and rubber washers under ball
take ball and washer to ACe or lowes and match the pieces (usually sold as a kit
follow directions and installl
turn water on and pat yo!ur self on the back !
SOURCE: Can't tighten single handle moehn kitchen faucet
there is supposed to be a nut with a washer under the sink in the center, the metal plate is just for decoration, the nut and washer have to be installed before the sprayer is attached the stem that it connects to has threads on it for the nut your faucet should have came with a long socket made of plastic to install the nut
SOURCE: Kohler Fairfax single control kitchen sink faucet
Remove the air-irater at the end of the faucet where the water comes out. That is where 99% of clog are on faucets. If that does not do it then you need to replace the cartridge.
Good Luck and please rate 4 thumbs up for the free answer.
SOURCE: One of the handles on my Kohler faucet does not
Removing the faucet stems and coating them( inside and out) with plumber's silicone lubricant should solve the problem. If the stem is too corroded, you may need to replace the stem.
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