How to Adjust a Kohler Shower Control

Slide the handle off the faucet after taking out the handle's attachment screw, which is located on the side of the handle. Remove the round plug inside the screw hole if there is one before you take this screw out. Use an Allen wrench to unscrew the screw.

Take off the faucet's trim plate and cartridge cover, which is a sleeve installed on the body of the faucet. Unscrew the trim plate's two screws with a Phillips-head screwdriver and take the plate off by hand. The sleeve unscrews by rotating counterclockwise, and you can remove it by hand.

Rotate the stem on the cartridge, the knob on the end of the faucet body, clockwise until the water turns hot. Adjust the knob by turning it left or right until the temperature is satisfactory.

Unscrew the screw on top of the collar on the end of the cartridge, using the Allen wrench. Pull off the collar. Position the collar so it stops at the position where the water temperature is right. Either tighten or loosen the screw in the collar with an Allen wrench to make smaller adjustments. This screw moves the collar position slightly. Test and adjust the collar as necessary to change the water temperature.