A push-button metering faucet that keeps running needs its timing mechanism and sealing parts identified, not an ordinary handle-tightening fix. Compare the actual cycle with the model's setting, then arrange isolated service for debris, damaged seating or worn components. Chicago Faucets documents different cartridge families; do not apply one adjustment or rebuild method to every metering faucet.
Identify the cartridge before adjusting it
First determine whether the faucet eventually stops, runs continuously, or drips after its intended cycle. Those are different observations. A push button is intended to initiate a timed operation on a metering faucet, so pushing it harder is not a substitute for identifying the actual fault.
Chicago Faucets' repair guide distinguishes its MVP metering cartridges from NAIAD slow-closing and other cartridge arrangements. Timing mechanisms and service parts differ. A picture of a similar push button does not identify the internal family or the correct replacement.
Record the faucet model, any available service paperwork and whether the problem began after cartridge replacement. The guide to ordinary dripping faucets addresses another type of operation; its washer or handle instructions should not be transferred to a timed cartridge.
Separate long timing from failure to seal
The cited MVP retrofit instructions say accumulated lime or dirt can cause short or excessively long cycles. They also describe debris at a seat and damaged or unclean seating surfaces as reasons for dripping or running on. A long cycle therefore does not automatically prove that the timing setting is wrong.
Time the cycle from a normal activation and note whether the flow stops completely. Do not keep changing an adjustment without knowing its specified direction and range. Chicago's guide provides family-specific timing instructions; a NAIAD dashpot and an MVP adjustment are not the same mechanism.
Establish isolation before internal service
Use the identified supply shutoff only if it is accessible and operates safely. Do not remove a cartridge, cap or actuator while the fitting is pressurized. Chicago's repair directions explicitly require turning off the water before cartridge replacement.
An installer should match the cartridge, filters and sealing components to the faucet and inspect the existing seat. A nicked or damaged body seat may need a different remedy from another cartridge. Do not mix filters or parts simply because they fit beneath the same button.
Verify the repaired cycle in its actual use
Check that normal activation produces the intended cycle and that water stops without continuing leakage. A commercial handwashing installation can have operational requirements beyond water conservation; do not shorten it arbitrarily to hide a fault. Low-flow and metering faucets explains how these designs differ.
Keep the final part and setting in the facility's plumbing maintenance plan. Record a continuing leak or a button that sticks as an unresolved condition rather than repeatedly asking users to press again.