NEW YORK—As senior U.S. and Chinese economic officers approach to go over China’s compliance with a trade offer signed early this calendar year, far more than 40 American small business groups named on Beijing to move up buys of U.S. made items as very well as electrical power and other solutions as element of the settlement.

In a letter despatched Monday to Treasury Secretary Steven Mnuchin, U.S. Trade Consultant Robert Lighthizer and Chinese Vice Leading Liu He, the small business associations, led by the U.S. Chamber of Commerce, voiced sturdy aid for…