Kohler K-3519 Homeowner's Manual page 7

Gap Clearance
If the toilet does not activate, the gap between the actuator and
the plunger arm may need to be reset. Make sure the trip lever
handle is installed, and the trip lever nut is tight. This is a
left-hand thread; turn counterclockwise to tighten.
Make sure the water supply is on, and the supply line water has
stopped flowing into the toilet.
Loosen the setscrew. Turn the actuator until there is a 1/16"
(2 mm) - 1/8" (3 mm) gap between the actuator and the plunger
arm. Turn the actuator clockwise to increase the gap.
Tighten the setscrew after the gap is properly adjusted.
NOTE: Loss of gap clearance adjustment could cause leakage into
the toilet bowl due to the plunger not sealing properly. This
condition could cause a continual flow of water. If the problem is
not corrected after adjustment, refer to the Troubleshooting section.
Kohler Co.
1/16" (2 mm) –
1/8" (3 mm) Gap
Setscrew
Plunger Arm
7
Actuator
1054184-5-B