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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 specifications ..................................................................................................................... 42-11
Hydraulic oil level check ............................................................................................................................ 42-11
Hydraulic tank (S/N 0101~0200, 9001~) ................................................................................................... 42-12
Hydraulic tank (S/N 0201~) ....................................................................................................................... 42-14
Hydraulic Pump ............................................................................................................................................... 42-16
Loading and pilot and brake pump ............................................................................................................ 42-17
Pump specifications .................................................................................................................................. 42-17
Steering pump ........................................................................................................................................... 42-18
Steering pump specifications .................................................................................................................... 42-18
Hydraulic pump principle ........................................................................................................................... 42-19
Hydraulic pump wear plate ........................................................................................................................ 42-20
Hydraulic pump bushing lubrication .......................................................................................................... 42-20
Hydraulic Cylinder ........................................................................................................................................... 42-21
Boom cylinder ........................................................................................................................................... 42-21
Bucket cylinder .......................................................................................................................................... 42-21
Steering cylinder ....................................................................................................................................... 42-22
Hydraulic cylinder specifications ............................................................................................................... 42-22
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