TM10-3930-660-20 18-4. TANDEM GEAR PUMP - ^{TEST/REPLACE ~} (Cont’d) 1. DISCONNECT HYDRAULIC HOSES (1). a. Tag four hydraulic hoses (1), (2), (3), and (4) for use during installation. b.   Remove four hydraulic hoses (1), (2), (3), and (4) from elbow (5), (6), (7), and (8). Cap or plug all hydraulic lines or  openings. 18-7