On July 28, 1987, Wang Zhizhong, the factory director, signed a contract for contracted management on behalf of Shandong Linshui Engineering Machinery Factory with the Economic Commission and Finance Bureau of Linshui District.

On February 25th, at the All Staff Contract System Conference of Linyi Construction Machinery Factory, Wang Zhizhong, the leader of the regional economic commission and the factory director, signed for verification.

In December 1991, Linyi Engineering Machinery Factory was designated as a pilot enterprise for deepening enterprise reform in Shandong Province.

In 1993, Shandong Linyi Engineering Machinery Factory entered the list of top 500 industrial enterprises with the best economic benefits in the country.

In March 1993, Wang Zhizhong was elected as a deputy to the Eighth National People's Congress.

On October 1, 1993, the factory newspaper of Linyi Engineering Machinery Factory, Weilig Newspaper, was founded.