How do I replace a hose diverter in a single handle Kohler kitchen sink?

William, you or a plumber will have to replace the cartridge and seals to stop the leaks. The parts may have life time warranty, check your manual if you still have it. Check the attached links,instruction and guides, Good luck
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Maintenance Replacement Parts KOHLER
Fort single control pullout kitchen sink faucet with color matched...
Kohler kitchen faucet repair

Remove sprayer and hose from faucet body.
Remove handle and cartridge.
Pull up on body.
Replace parts and reinstall in reverse order.

Hi! Yes it sounds like the spray diverter needs replacing. Kohler .com will have this part online or you could try a plumbing supply shop.

you will need to replace the washer, you will have to disconnect the faucet underneath and replace the washer,then tighten accordingly

Shut off water supply Under Sink: · Unscrew brass connector for spayer hose · Disconnect single water line to faucet bysqweezing lever on connector and Gently pulloff. · Loosen two screws on faucet base washers thenunscrew the washers on thebrass faucet shaft ( NOTE: Have someone hold the fauct so it does Not accidentlyfall in sink when the support washers are removed) · Take faucet out of sink · Unscrew brass collar at base and remove · Remove Set Screw on lower body of faucet · Pull out Brass Mechanism from faucet · The Diverter is located in the Brass mechanism · Remove the Washer · Pull off the small top valve in center of theDiverter, if still there · Using a large wood screw that fits/screw intothe exposed hole In the center of The plasticdiverter, screw it in and pull out the remaing part of the old diverter · Flush out Faucet to remove any remaining debrie · Replace with new diverter and replace washer · Grease all areas that where greased when mechanismwas removed Remove & clean the faucet Airrater and replace only afterEVERYTHING has been Completed soyou can flush the faucet out again into the sink, then replace.

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.

change the cartrige

is this a single handle faucet. If not the part goes in under the handle

There is a small diverter valve on the faucet underneath where the hose connects too it needs to be replaced depending on the age of the faucet I usually recommend replacing the entire faucet with another Moen product

Are you sure the spray handle is allowing the valve to open enough to allow enough water through? The problem it seems like is physical or mechanical. I am assuming you get good water flow through the faucet itself.