Robert R. Pinches, 62, an official of the 4-H Youth program at the Department of Agriculture, died of a heart attack Monday at Prince George's General Hospital in Cheverly.

Mr. Pinches specialized in management and accountability for 4-H programs, which are run by Agriculture's cooperative extension service. He reviewed county and state programs and worked with the Internal Revenue Service on their tax-exempt status.

He began his 4-H career during World War II, when he was the foreman of a dairy farm in Connecticut and became leader of a local 4-H club. He joined the cooperative extension service in Minnesota as a 4-H official in 1945. He was a 4-H leader in Iowa and Minnesota before transferring to Washington in 1962.

In 1976, Mr. Pinches received Agriculture's Superior Service Award, and in 1975 he was honored by the National Association of 4-H Agents with their Superior Service Award.

Mr. Pinches was born in Conneaut, Ohio, and graduated from Ohio State University. In 1956, he earned a master's degree in rural sociology from the University of Minnesota. He was author or coauthor of numerous articles in professional journals, including a two-volume summary of "Long Term 4-H Trends, 1948-1975."

Survivors include his wife, Marcia, a son, Carl, and a daughter, Marie, all of the home in College Park.

The family suggests that expressions of sympathy be in the form of contributions to the National 4-H Council Cooperative Fund, 7100 Connecticut Ave. NW, Washington, 20015.