6.9.3.6 Removing and disassembling the gear .........................6-140
6.9.3.7 Reassembling the crown wheel and the differential assembly ........6-142
6.9.3.8 Adjusting the taper distance, refitting and shimming the gear ........6-143
6.9.3.9 Refitting and shimming the differential assembly .................6-147
6.9.3.10 Adjusting and checking the backlash .........................6-152
6.9.3.11 Final reassembly ........................................6-156
6.9.4 Service tools ..................................................6-157
6.9.4.1 General ...............................................6-157
6.9.4.2 GPA20/Differential - Service tools ............................6-157
6.10 GPA20/Brake pistons ............................................6-158
6.10.1 General .....................................................6-158
6.10.2 Principles of operation ..........................................6-158
6.10.3 Layout of components ..........................................6-159
6.10.3.1 View of the assembly ....................................6-159
6.10.3.2 Blown-up view .........................................6-160
6.10.4 Disassembly/reassembly ........................................6-160
6.10.4.1 Disassembly ...........................................6-160
6.10.4.2 Reassembly ...........................................6-162
6.11 GPA20/Hand brake unit and control ..............................6-165
6.11.1 General .....................................................6-165
6.11.2 Principles of operation ..........................................6-165
6.11.3 Layout of components ..........................................6-167
6.11.3.1 View of the assembly ....................................6-167
6.11.3.2 Blown-up view - Three disks ...............................6-169
6.11.4 Disassembly/reassembly ........................................6-171
6.11.4.1 Disassembly ...........................................6-171
6.11.4.2 Reassembly ...........................................6-173
6.11.4.3 Fitting the control .......................................6-178
6.11.4.4 Adjusting the control .....................................6-178
6.12 GPA20/Tractor braking ..........................................6-180
6.12.1 Assisted brake master cylinders: ..................................6-180
6.12.1.1 General ..............................................6-180
6.12.1.2 Principles of operation ....................................6-181
6.12.1.3 Layout of components ...................................6-182
6.12.1.4 Removing/refitting the assisted-brake master cylinders ............6-183
6.12.2 High-pressure braking ..........................................6-186
6.12.2.1 General ..............................................6-186
6.12.2.2 Principles of operation ....................................6-187
6.12.2.3 Layout of components and designation of hydraulic ports in the high-
pressure braking unit ............................................6-189
6.12.2.4 Decompressing the high-pressure braking system ...............6-190
6.12.2.5 Removing and refitting the high-pressure braking unit .............6-190
6.12.3 Load Sensing trailer braking ......................................6-192
6.12.3.1 General ..............................................6-192
6.12.3.2 Principles of operation ....................................6-193
6.12.3.3 Schematic diagram ......................................6-195
6.12.3.4 Identification of 110 l/min Load Sensing ports ..................6-197
6.12.3.5 Removing and refitting the trailer braking unit ...................6-200
6.12.3.6 Plug tightening torques in the event of maintenance on the spools (2) (6)
............................................................6-203
6.12.4 Open Center trailer braking ......................................6-203
6.12.4.1 General ..............................................6-203
6.12.4.2 Principles of operation ....................................6-204
6.12.4.3 Identification of pipes, hoses and ports .......................6-207
6.12.4.4 Identification of channels ..................................6-208
6.12.4.5 Removing and refitting the brake spool valve ...................6-209
6.12.5 Adjustments, bleeding and calibrations ..............................6-210
Table of contents
MF 6700 S series tractors
ACT0025630
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