SANY LATIN AMERICA
Structure and Function
SY195/205/215/225C9 Crawler Hydraulic Excavator
Structure and Function
Shop Manual - June 2013
4-1
4 Structure and Function
4.1 Engine and Cooling System .................................................................................... 4-5
4.1.1 Engine-related parts....................................................................................... 4-5
4.1.2 Radiator and intercooler................................................................................. 4-6
4.2 Power Train.............................................................................................................. 4-7
4.2.1 Power transmission system .......................................................................... 4-7
4.2.2 Final drive assembly ...................................................................................... 4-8
4.2.3 Swing machinery.......................................................................................... 4-12
4.2.4 Swing bearing .............................................................................................. 4-14
4.3 Undercarriage and Frame...................................................................................... 4-15
4.3.1 Track frame and recoil spring....................................................................... 4-15
4.3.2 Idler .............................................................................................................. 4-17
4.3.3 Carrier roller ................................................................................................. 4-19
4.3.4 Track roller ................................................................................................... 4-20
4.3.5 Track shoe ................................................................................................... 4-21
4.3.6 Triple grouser shoe ...................................................................................... 4-25
4.4 Hydraulic System, Part 1 ....................................................................................... 4-26
4.4.1 Hydraulic equipment layout.......................................................................... 4-26
4.4.2 Hydraulic tank and
fi
lter ............................................................................... 4-28
4.4.3 Hydraulic pump
................................................................................................... 4-29
4.4.4 Pilot pump .................................................................................................... 4-36
4.4.5 Regulator .................................................................................................... 4-37
4.4.5.1 Control mechanism makeup ............................................................... 4-39
4.4.5.2 Adjustment of the regulator ................................................................. 4-40
4.4.5.3 Operation ............................................................................................ 4-42
4.5 Hydraulic System, Part 2 ....................................................................................... 4-45
4.5.1 Control valve ................................................................................................ 4-45
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