TM 9--2520--215--34 0005 00--1 THEORY OF OPERATION 0005 00 THIS WORK PACKAGE COVERS: Equipment Operation and Description HYDRAULIC SYSTEM GEAR PACKAGE SECTION A--A OIL LEVEL INDICATOR BREATHER AIR AIR OUTPUT GEAR COMPARTMENT OIL LEVEL A A SHIFT INHIBITOR AIR OIL LEVEL LEFT APPLY BRAKE COOLANT PUMP TWO--SECTION OUTPUT DRIVEN PUMP OUTPUT REDUCTION GEAR ASSEMBLY STEER VALVE BODY ASSY STEER CLUTCH COOLANT LEFT--STEER CLUTCH SELECTOR VALVE RELIEF VALVE (50 PSI) FILTER RIGHT APPLY TO REVERSE--RANGE CLUTCH TO LOW--RANGE CLUTCH PUMP TURBINE CONVERTER TO COOLER FROM COOLER FILTER GOVERNOR PRESSURE SECTION B--B STEER DRIVE SHAFT LUBRICATION PRESSURE REGULATOR (5--30 PSI) ENGINE MANIFOLD VACUUM CONNECTION GOVERNOR PITOT TUBE RIGHT--STEER CLUTCH B B R¹ 2^3 N TO INTERMEDIATE--RANGE CLUTCH OUTPUT DRIVEN PRESSURE PUMP TO RESERVOIR CONVERTER LOCKUP TIMER VALVE INPUT DRIVEN PRESSURE PUMP R    F R R F F COOLER BY--PASS VALVE (80 PSI) STEER CLUTCH PRESSURE REGULATOR VALVE (105 PSI) RELIEF VALVE (50 PSI) MAIN--PRESSURE REGULATOR VALVE (120--180 PSI IN NEUTRAL, HIGH AND INTERMEDIATE) Hydraulic System--Schematic View OIL RESERVOIR TO LUBRICATION SYSTEM CONVERTER PRESSURE REGULATOR VALVE (80 PSI) SCAVENGE PUMP TWO--SECTION INPUT DRIVEN PUMP TO LEFT BRAKE TO RIGHT BRAKE AIR VALVE (CLOSED ON BRAKE APPLY) TO HIGH-- RANGE CLUTCH TO LOCKUP CLUTCH CONVER-- TER LOCKUP RELAY VALVE