A mediator was trying to settle a labor dispute at Belmont Park that threatens to scratch I’ll Have Another’s chance of winning thoroughbred racing’s first Triple Crown in more than 30 years.

As Gov. Andrew Cuomo urged both sides to reach agreement, an official with the union representing maintenance and starting gate workers at the New York racetrack said he hadn’t heard of any progress as the mediator continued to meet Tuesday afternoon with the New York Racing Association and union leaders.

About 150 union members at NYRA’s Belmont, Aqueduct and Saratoga tracks have been working without a contract since February 2011, a year after the previous contract was given a one-year extension. The workers last month authorized a strike to begin Friday, a day before the running of the Belmont Stakes, the final jewel in the Triple Crown. I’ll Have Another is trying become the first horse to win the Triple Crown since Affirmed in 1978.