Walker joined the unit's management board on Feb. 1 as chief operating officer and succeeds Andreas Schierenbeck as CEO, who left the group on Nov. 30 after the business fell further behind peers, most notably Finland's Kone.

Reuters told sources last month that Walker, a company veteran that joined the firm in 1995, was likely to succeed Schierenbeck.

(Reporting by Christoph Steitz; editing by Thomas Seythal)