Hitachi ZW 550-G Technical Manual page 7

Function & Structure Torque Converter and Transmission Group ........................................................................ 32-1
Torque Converter .............................................................................................................................................. 32-2
Torque converter structure .......................................................................................................................... 32-3
Power flow path .......................................................................................................................................... 32-3
Torque multiplication ................................................................................................................................... 32-3
Torque Converter Gear Pump ........................................................................................................................... 32-4
Gear pump specifications ........................................................................................................................... 32-4
Transmission ..................................................................................................................................................... 32-5
Clutch combination ..................................................................................................................................... 32-6
Planetary gear ............................................................................................................................................. 32-6
Shift lever position ....................................................................................................................................... 32-6
Power up switch operation .......................................................................................................................... 32-6
Gear train and number of teeth ................................................................................................................... 32-7
Clutch Pack ..................................................................................................................................................... 32-10
Power Flow Path in the Transmission ..............................................................................................................32-11
Forward ......................................................................................................................................................32-11
Reverse ..................................................................................................................................................... 32-14
Hydraulic System Diagram ............................................................................................................................. 32-16
Hydraulic Circuit Diagram ............................................................................................................................... 32-17
T/C and T/M Oil Circulation ............................................................................................................................. 32-18
Oil flow in the torque converter line ........................................................................................................... 32-19
Oil flow to the clutch .................................................................................................................................. 32-19
Modulator Valve Unit ....................................................................................................................................... 32-20
Interior schematic (not exact representation) ............................................................................................ 32-22
Modulation Mechanism ................................................................................................................................... 32-23
Modulator valve function ........................................................................................................................... 32-23
Modulator valve operation ......................................................................................................................... 32-25
Clutch Solenoid Valve ..................................................................................................................................... 32-26
Check & Adjustment Torque Converter and Transmission Group ........................................................................ 33-1
Clutch Oil Pressure and Time Lag .................................................................................................................... 33-2
Measuring clutch oil pressure ..................................................................................................................... 33-2
Measuring clutch time lag ........................................................................................................................... 33-4
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