9.8.1 General ......................................................9-127
9.8.2 Low-pressure system, low flow rate .................................9-127
9.8.3 High-pressure system, high flow rate ................................9-130
9.8.4 Hydraulic tests ................................................9-130
9.8.4.1 General ...............................................9-130
9.8.4.2 High flow rate system .....................................9-131
9.8.4.3 Low flow rate system .....................................9-134
9.9 GPA20/Open Center/Right-hand cover plate .......................9-141
9.9.1 General ......................................................9-141
9.9.2 Layout of components ...........................................9-142
9.9.2.1 View of external assembly ..................................9-142
9.9.2.2 View of internal assembly ..................................9-144
9.9.3 Blown-up view ................................................9-147
9.9.4 Disassembly/reassembly .........................................9-149
9.9.4.1 Removing/refitting the cover plate ............................9-149
9.9.4.2 Disassembling/reassembling the high pressure valve ..............9-152
9.9.4.3 Removing/refitting the pump ................................9-153
9.10 GPA20/Open Center/Left-hand cover plate ........................9-154
9.10.1 General .....................................................9-154
9.10.2 Layout of components ..........................................9-155
9.10.3 Removal/refitting ..............................................9-156
9.10.3.1 Removal ..............................................9-156
9.10.3.2 Preparing for refitting ....................................9-158
9.10.3.3 Refitting ..............................................9-159
9.10.3.4 Final steps ............................................9-159
9.11 GPA20/100 l/min Open Center ...................................9-160
9.11.1 General .....................................................9-160
9.11.2 Low-pressure system, low flow rate ................................9-160
9.11.3 High-pressure system, high flow rate ...............................9-163
9.11.4 Hydraulic tests ...............................................9-163
9.11.4.1 General ..............................................9-163
9.11.4.2 High flow rate system ....................................9-164
9.11.4.3 Low flow rate system ....................................9-168
9.12 GPA20/100 l/min Open Center/Right-hand cover plate .............9-174
9.12.1 General .....................................................9-174
9.12.2 Layout of components ..........................................9-175
9.12.2.1 View of external assembly .................................9-175
9.12.2.2 View of internal assembly .................................9-177
9.12.3 Blown-up view ...............................................9-179
9.12.4 Disassembly/reassembly ........................................9-181
9.12.4.1 Removing/refitting the cover plate ...........................9-181
9.12.4.2 Disassembling/reassembling the high pressure valve .............9-184
9.12.4.3 Removing/refitting the pump ...............................9-185
9.13 GPA20/100 l/min Open Center/Left-hand cover plate ..............9-186
9.13.1 General .....................................................9-186
9.13.2 Layout of components ..........................................9-187
9.13.3 Disassembly/reassembly ........................................9-188
9.13.3.1 Removal/refitting .......................................9-188
9.14 GPA20/Open Center/Linkage spool valve .........................9-192
9.14.1 General .....................................................9-192
9.14.2 Principles of operation ..........................................9-192
9.14.3 Layout of components and identification of ports .......................9-201
9.14.4 Removing/refitting the spool valve .................................9-202
9.14.4.1 Removal ..............................................9-202
9.14.4.2 Preparing for refitting ....................................9-203
9.14.4.3 Refitting ..............................................9-203
9.14.4.4 Final steps ............................................9-203
Table of contents
MF 6700 S series tractors
ACT0025630
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