TM 5-3805-258-24-1P O W E R T R A I NT R A N S M I S S I O N H Y D R A U L I C S Y S T EMOutlet oil from the converter goes to relief valve(13) for converter outlet. The relief valve (13) keepsthe pressure inside the converter at approximately415 kpa (60 psi). From the outlet relief valve, the oilgoes through line (6) to oil cooler (12).After going through the cooler, the oil at a lowertemperature, goes through outlet line (14) to thetransmission planetary. This oil is for lubrication ofthe transmission.The oil from flywheel housing (7) goes throughreturn line (15) to the main reservoir at the bottom ofcase (11).OIL PUMPL O C A T I O N O F O I L P U M PThe oil pump is a single-section gear-type mount-ed between the hydraulic implement pump and thehousing assembly (torque converter housing).The main components of the oil pump are: bodyassembly (2), cover assembly (1), manifold assembly(3), gear (4) and gear (5).Drive gear (4) is connected by splines to the pumpdrive. The hydraulic implement pump is driven bydrive gear (4).S Y S T E M S O P E R A T I O NIn operation, oil comes from the reservoir in theoutput transfer gear case, through the magneticscreen to an opening in manifold assembly (3). Theoil fills the spaces between the teeth of gears (4), and(5) and body (2). As the gears turn, oil is pushedfrom body (2). The oil goes through another passagein manifold assembly (3) to an oil line. The oil thengoes to the filter.When the engine is not running, air is present inthe pump. When the engine is started, a line on theoutlet side of the pump lets the air go from the pump.This prevents air from getting into the system. Afterall air is out of the pump, an orifice in the line lets aspecific amount of oil go to the relief valve for con-verter outlet.OIL PUMP CONSTRUCTION1. Cover asaembly. 2. Body aasembly. 3. Manifold aaaem-bly. 4. Gear.5. Gear.3-27
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