The suit filed Monday by a captain, battalion chief and deputy chief says the city refuses to pay overtime when they work beyond their regular 53-hour weekly time cap.
The lawsuit alleges the captains and chiefs were made eligible for overtime under federal labor regulations in 2004. The firefighters claim the city has known since 2009 that captains and chiefs regularly work beyond their time cap.
A spokeswoman for Mayor Luke Ravenstahl declined comment to the Pittsburgh Tribune-Review.
The city was ordered last year to pay more than $900,000 in penalties and fees for failing to pay police overtime in a timely fashion.