PEORIA, Ill. (AP) — The United Auto Workers say the union has reached a tentative labor agreement with Caterpillar Inc., averting a possible walkout.

The UAW says the tentative six-year deal was reached Monday night. Union members will vote on it this weekend.

Both Caterpillar and the union issued releases on the agreement Monday night, but neither revealed any details about the proposed contract.

The agreement would cover some 9,500 hourly production and maintenance workers in Peoria, Aurora, Decatur and Pontiac in Illinois as well as in York, Pa.; Denver; and Memphis, Tenn.

The current six-year contract between Caterpillar and the UAW was scheduled to expire at midnight Monday.

The two sides reportedly met throughout the weekend and resumed for a 12-hour session Monday.

Negotiations began Dec. 15, 2010.