LA CROSSE, WI—Almost 500 production workers at the Trane assembly plant here are on strike, citing pay and forced overtime as top issues in contract negotiations.

Members of the International Association of Machinists and Aerospace Workers rejected a contract proposal from the maker of heating, ventilation and air conditioning equipment Saturday, and their previous contract at the Ingersoll Rand-owned Trane expired at midnight.

“We’re just here fighting for a livable wage,” said John Hampson, an electrical mechanical technician at the plant, in an article in the La Crosse Tribune.

An Ingersoll Rand spokeswoman issued a statement Monday that said, in part, “Ingersoll Rand is committed to delivering premier performance for our customers and has taken measures to ensure business continuity at the facility until our valued employees return to work. We are hopeful for a resolution.”