TM9-2320-361-10 2-27. OPERATION OF WATER TANK TRUCKS (Contd) (6) Start engine (refer to para, 2-14 or 2-15), and place transfer case shift lever (12) in middle position (neutral). (7) Engage transfer power takeoff lever (13) and place transmission gearshift lever (11) in “4” (fourth) position. (8) Pull out hand throttle (10) to run engine at 1100 rpm. NOTE Always empty front tank compartment first to keep load properly distributed for vehicle operation. (9) Pull compartment lever (14) (front tank) or (15) (rear tank) back, to open position. (10) Turn pump delivery line discharge valve knob (16) left, to open position. 2-125