TM10-3930-660-20 18-4. TANDEM GEAR PUMP   -  TEST/REPLACE This task covers: a. Removal b. Installation c. Testing Initial Setup Tools Tool Kit, Auto Mechanics Materials/Parts Caps and Plugs Container Lifting Device, 5 Ton Capacity Hydraulic oil (App. C, Item 35) Lockwashers  (11) Test  Equipment O-ring  (13) In-Line Flowmeter Tags (App. C, Item 51) STE/ICE Test Set Reference TM10-3930-660-10 Test Hose Equipment  Condition Vehicle parked on level ground with wheels blocked. Boom raised and blocked. Transmission cover removed, para.  16-6. WARNING Hydraulic oil in the system can be under pressures over 3000 psi with the engine OFF. ALWAYS relieve pressure in hydraulic lines before attempting to remove any component in the hydraulic system. With engine OFF, starter switch in RUN position, and MLRS attachment on the ground, move control levers through all operating positions several times to relieve line pressure. Relieve pressure in hydraulic oil tank by loosening filler cap very slowly. Failure to follow these precautions could result in serious personal injury. WARNING At operating temperatures, hydraulic oil is hot and under pressure. Hot oil can cause injuries. Allow hydraulic oil to cool before disconnecting any hydraulic lines. WARNING When working under the boom, always use blocks or other supports. Combined weight of boom and MLRS attachment is approximately 6300 pounds. Failure to adequately support the boom could result in severe injury or death. CAUTION Wipe the area clean around all hydraulic connections to be opened during removal and disassembly. Cap oil lines and plug holes after removing lines. Contamination of the hydraulic system could result in premature failure. If more than one hydraulic line is to be removed, identify lines to assure proper installation. Use suitable container to catch any hydraulic oil that may drain from  system. 18-6