HYDRAULIC SYSTEM - CONTINUED
Variable displacement, constant pressure pump with eight radially arranged pistons.
Inlet fed by hydraulic oil filter relief valve and speed gear assembly (reverser) clutch control valve through low
pressure oil lines.
High pressure output hydraulic fluid routed through high pressure oil lines to pressure control valve, hydraulic
accumulator, and steering valve.
Passes excess low pressure hydraulic fluid directly to hydraulic oil cooler through low pressure oil line.
Excess hydraulic fluid from hydraulic pump shaft lubrication is routed to transmission case sump through drain line
to protect pump shaft seal from pressure build-up.
Delivers on demand to maintain hydraulic system pressure for operation of all hydraulic system components.
HYDRAULIC PUMP STROKE CONTROL SOLENOID VALVE
Considered part of electrical system.
Normally closed solenoid is opened when starter switch is closed to bypass hydraulic pump discharge oil into pump
crankcase during engine cranking.
Reduces load on engine to make starting easier.
HYDRAULIC PUMP-TO-SPEED GEAR ASSEMBLY (REVERSER) SEAL DRAIN LINE
Routes excess hydraulic fluid from hydraulic pump shaft lubrication to transmission case sump.
Protects hydraulic pump shaft seal from pressure build-up.
HYDRAULIC PUMP-TO-HYDRAULIC OIL COOLER OIL LINE
Routes low pressure hydraulic fluid not needed by hydraulic pump directly to hydraulic oil cooler.
HYDRAULIC OIL COOLER
Considered part of transmission system.
Finned core air cools hydraulic fluid routed to it through low pressure oil line from hydraulic pump.
Routes cooled hydraulic fluid through low pressure oil line to clutch control valve.
HYDRAULIC OIL COOLER-TO-CLUTCH CONTROL VALVE OIL LINE
Routes cooled low pressure hydraulic fluid from hydraulic oil cooler to speed gear assembly (reverser) clutch
HYDRAULIC PUMP-TO-PRESSURE CONTROL VALVE OIL LINE
Routes high pressure hydraulic fluid from hydraulic pump, to hydraulic pump pressure line tee-to-hydraulic
accumulator oil line, and pressure control valve.