Hitachi ZW370 Technical Manual page 8

Modulator Valve Unit ....................................................................................................................................... 32-25
Interior schematic (simple explanation) ..................................................................................................... 32-27
Modulator valve function ........................................................................................................................... 32-28
Modulator valve operation ......................................................................................................................... 32-30
Control Valve Assembly .................................................................................................................................. 32-32
Check valve ............................................................................................................................................... 32-34
Clutch solenoid valve assembly ................................................................................................................ 32-35
Clutch valve assembly .............................................................................................................................. 32-39
33 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
42 Function & Structure Hydraulic Group .............................................................................................................. 42-1
Flushing Hydraulic Circuit ................................................................................................................................. 42-2
Purpose of flushing ..................................................................................................................................... 42-2
Cautions on Hydraulic Parts Replacement ....................................................................................................... 42-3
Hydraulic Circuit Symbols ................................................................................................................................. 42-4
Hydraulic lines ............................................................................................................................................. 42-4
Pumps & motors .......................................................................................................................................... 42-4
Cylinders ..................................................................................................................................................... 42-4
Operation methods ...................................................................................................................................... 42-5
Pressure control valve ................................................................................................................................. 42-5
Flow control valve ....................................................................................................................................... 42-5
Directional control valve .............................................................................................................................. 42-6
Check valve ................................................................................................................................................. 42-6
Miscellaneous hydraulic symbols ................................................................................................................ 42-7
Hydraulic System Operation ............................................................................................................................. 42-8
Hydraulic system operation outline ............................................................................................................. 42-8
Layout of Hydraulic Units ................................................................................................................................ 42-10
Hydraulic Tank ................................................................................................................................................. 42-11
Hydraulic Tank (S/N 9001~9300) .............................................................................................................. 42-11
Hydraulic Tank (S/N 9301~) ...................................................................................................................... 42-13
Hydraulic tank specifications ..................................................................................................................... 42-15
Hydraulic oil level check ............................................................................................................................ 42-16
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