Coaching
Lum joined the Yokohama Taiyo Whales in 1982, and batted .269 with twelve home runs and 46 RBIs. Following his one season in Japan, Hank Aaron, now the Braves' minor-league farm director, invited Lum to Spring training 1983 to coach with the extended Spring program. Following Spring training, he became a coach with the Anderson Braves of the South Atlantic League.
He jumped to the Chicago White Sox organization in 1984. Following the passing of White Sox hitting coach Charlie Lau that March, Lum assisted his replacement, Joe Nossek over the rest of the season. The job was given to Lum exclusively in 1985. He was fired at the end of the season despite the fact that the Chisox won eleven more games, drove in 55 more runs, and had a higher batting average (.253, vs .247 in 1984).
He joined the San Francisco Giants in 1986 as a roving instructor. The following season, he held the same job with the Kansas City Royals. He became their major league hitting coach in 1988 & 1989 before returning to the White Sox in 1990 as minor-league hitting coordinator. He remained at that post through 2005. In 2006 he joined the Milwaukee Brewers organization as hitting coach for the class A South Atlantic League's West Virginia Power, and was named the South Atlantic League "Coach of the Year."
When the Hawaii Winter League resumed play in 2006 after eight inactive seasons, Lum joined the North Shore Honu. After just one season, he returned to the Brewers organization as minor-league hitting coordinator. In 2010, he joined the Pittsburgh Pirates organization as hitting coach for the Gulf Coast League Pirates.
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