SANY LATIN AMERICA
4-3
SY195/205/215/225C9 Crawler Hydraulic Excavator
Structure and Function
Shop Manual - June 2013
4.7.4.1 Refrigeration cycle diagram .............................................................. 4-134
4.7.4.2 Heating cycle diagram ...................................................................... 4-134
4.7.5 Compressor ............................................................................................... 4-135
4.7.6 Clutch ......................................................................................................... 4-137
4.7.8 Condenser ................................................................................................. 4-138
4.7.7 Expansion valve ......................................................................................... 4-138
4.7.9 Evaporator ................................................................................................. 4-139
4.7.10 Receiver tank ........................................................................................... 4-139
4.7.11 Pressure switch ........................................................................................ 4-140
4.7.12 Fresh air sensor ....................................................................................... 4-141
4.7.13 Refrigerant ............................................................................................... 4-141
4.7.14 Compressor oil ......................................................................................... 4-160
4.8 Engine Control ..................................................................................................... 4-161
4.8.1 System operation ...................................................................................... 4-162
4.8.2 Components............................................................................................... 4-163
4.8.2.1 Fuel control dial ................................................................................. 4-163
4.8.2.2 Controller .......................................................................................... 4-165
4.9 Electrical Control System..................................................................................... 4-167
4.9.1 Control function .......................................................................................... 4-167
4.9.2 Machine control system diagram ............................................................... 4-168
4.9.3 Engine and pump composite control function ............................................ 4-170
4.9.4 Pump control function ................................................................................ 4-174
4.9.4.1 Electrical positive
fl
ow control ........................................................... 4-175
4.9.4.2 Constant power control ..................................................................... 4-178
4.9.5 Valve control function ................................................................................. 4-180
4.9.5.1 Bucket
fl
ow control ............................................................................ 4-181
4.9.5.2 Swing priority control ......................................................................... 4-182
4.9.6 Duo travel speed control ............................................................................ 4-183
4.9.7 Engine preheating/overheating alarm ....................................................... 4-185
4.9.7.1 Engine preheating ............................................................................. 4-186
4.9.7.2 Engine overheating alarm ................................................................. 4-187
4.9.8 Engine oil under–pressure alarm ............................................................... 4-187
4.9.9 Auto deceleration/acceleration control ....................................................... 4-188
4.9.10 Engine speed calibration function ............................................................ 4-190
4.9.11 Electrical Components ............................................................................. 4-192
4.9.11.1 Pump pressure sensor .................................................................... 4-192
4.9.11.2 Pilot pressure sensor ...................................................................... 4-193
4.9.11.3 Engine speed sensor ...................................................................... 4-194
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