MASSEY FERGUSON MF 6700 S Series User manual

Workshop Service Manual
MF 6700 S series tractors
Beauvais
AGCO S.A.S. - 41 avenue Blaise Pascal - 60000
Beauvais - France - RC B562 104 539
© AGCO 2016
May 2016
ACT0025630
English

Find manuals at https://best-manuals.com

MF 6700 S series tractors
1 Introduction ..............................................................1-1
1.1 General ........................................................... 1-3
1.1.1 Using the manual ................................................1-3
1.1.2 General specifications .............................................1-3
1.1.2.1 MF 6700 S Dyna-4 tractors ...................................1-3
1.1.2.2 MF 6700 S Dyna-6 tractors ..................................1-12
1.1.2.3 MF 6700 S Dyna-VT tractors .................................1-21
1.1.3 Forward speeds ................................................1-30
1.1.3.1 Forward speed with Dyna-4 40 kph transmission and 18.4R38 tires ....1-30
1.1.3.2 Forward speed with Dyna-4 40 kph transmission and 20.8R38 tires ....1-31
1.1.3.3 Forward speed with Dyna-6 40 kph ECO transmission and 20.8R38 tires 1-32
1.1.3.4 Forward speed with Dyna-6 50 kph transmission and 20.8R38 tires ....1-34
1.1.3.5 Forward speed for all models with transmission in Dyna-VT mode ......1-36
1.1.4 Dimensions and weights ..........................................1-37
1.1.5 Attachment points ...............................................1-41
1.1.5.1 Attachment points: MF 6712 S / MF 6713 S / MF 6714 S Dyna-4/Dyna-6
models without front linkage .......................................1-41
1.1.5.2 Attachment points: MF 6712 S / MF 6713 S / MF 6714 S Dyna-4/Dyna-6
models with front linkage .........................................1-43
1.1.5.3 Attachment points: MF 6715 S / MF 6716 S / MF 6718 S Dyna-4/Dyna-6
models without front linkage .......................................1-45
1.1.5.4 Attachment points: MF 6715 S/ MF 6716 S / MF 6718 S Dyna-4/Dyna-6
models with front linkage .........................................1-47
1.1.5.5 Attachment points: MF 6713 S / MF 6714 S / MF 6715 S / MF 6716 S /
MF 6718 S Dyna-VT models without front linkage: .......................1-49
1.1.5.6 Attachment points: MF 6713 S / MF 6714 S / MF 6715 S / MF 6716 S /
MF 6718 S Dyna-VT models with front linkage ..........................1-51
1.1.6 Capacities .....................................................1-52
1.1.7 Conversion table ................................................1-54
1.1.8 Retaining compounds and sealing products ............................1-55
1.1.9 Tightening torques ..............................................1-57
1.1.9.1 Tightening torques for screws and nuts .........................1-57
1.1.9.2 Tightening torques for hydraulic unions .........................1-61
1.2 Adjustments, bleeding and calibrations .............................1-65
1.2.1 Bleed operations: Dyna-VT - Assisted brake master cylinders ................1-65
1.2.1.1 Charge connector .........................................1-65
1.2.1.2 Pressure connector ........................................1-65
1.2.1.3 Bleed screw locations ......................................1-65
1.2.1.4 Procedure for bleeding the assisted braking system ................1-66
1.2.2 Bleed operations: Dyna-4/Dyna-6 - Assisted brake master cylinders ...........1-68
1.2.2.1 Charge connector .........................................1-68
1.2.2.2 Pressure connector - Load Sensing system ......................1-68
1.2.2.3 Pressure connector - Open Center system .......................1-68
1.2.2.4 Bleed screw locations ......................................1-69
1.2.2.5 Procedure for bleeding the assisted braking system ................1-70
1.2.3 Bleed operations: Dyna-4/Dyna-6 - High-pressure braking ..................1-72
1.2.3.1 Bleed screw locations ......................................1-72
1.2.3.2 Procedure for bleeding the high-pressure braking system ............1-73
1.2.4 Calibrations ....................................................1-74
1.2.4.1 Calibrating the automatic disengagement of the differential and 4-wheel
drive ........................................................1-74
1.2.4.2 Calibration of the forward-travel lever ...........................1-76
Table of contents
MF 6700 S series tractors
ACT0025630
Find manuals at https://best-manuals.com

1.2.4.3 Forward speed calibration ...................................1-79
1.2.4.4 Calibration of the Dyna-4 and Dyna-6 PowerShuttle transmission ......1-79
1.2.4.5 Calibrating the power sensor on the Dyna-6 transmission ............1-82
1.2.4.6 Dyna-VT transmission calibrations: Introduction and access to calibration
using the instrument panel ........................................1-83
1.2.4.7 Calibration of the high/low speed ranges (Hare/Tortoise) for Dyna-VT ...1-84
1.2.4.8 Dyna-VT transmission calibration .............................1-85
1.2.4.9 Calibration of the Dyna-VT coupler function ......................1-86
1.2.4.10 Rear power take-off calibration for Dyna-VT .....................1-87
1.2.4.11 Front power take-off calibration for Dyna-VT .....................1-88
1.2.4.12 Dyna-VT transmission calibration error code .....................1-89
1.2.4.13 Calibration of the clutch pedal sensor ..........................1-92
1.2.4.14 Calibration of the throttle pedal sensor .........................1-93
1.2.4.15 Calibrating the rear linkage .................................1-93
1.2.4.16 Calibration of the front linkage position sensor ...................1-95
1.2.4.17 Calibrate the suspended front axle. ...........................1-96
1.2.4.18 Calibrations to be carried out using the diagnostic tool .............1-98
2 Separation of assemblies ..................................................2-1
2.1 Front linkage ...................................................... 2-3
2.1.1 Removal/refitting .................................................2-3
2.2 Front axle ......................................................... 2-6
2.2.1 Removal/refitting .................................................2-6
2.3 Cooling unit .......................................................2-8
2.3.1 Removal/refitting .................................................2-8
2.4 Front frame .......................................................2-10
2.4.1 Removal/refitting ................................................2-10
2.5 Engine cover ......................................................2-14
2.5.1 Removal/refitting ................................................2-14
2.6 Engine ...........................................................2-16
2.6.1 Removing and refitting the engine ...................................2-16
2.6.2 Reassembling the engine flywheel ...................................2-20
2.7 Operator environment .............................................2-22
2.7.1 Removal/refitting ................................................2-22
3 Engine ...................................................................3-1
3.1 Tier 4F/Stage IV SCR Technology engine 4 cylinders ................. 3-3
3.1.1 General ........................................................3-3
3.1.1.1 Notice to the technician .....................................3-3
3.1.1.2 Safety instructions .........................................3-3
3.1.1.3 Description of engine types ...................................3-4
3.1.1.4 Location of the engine serial number ............................3-4
3.1.1.5 Lifting the engine ..........................................3-5
3.1.2 Principles of operation .............................................3-6
3.1.2.1 General operating diagram ...................................3-6
3.1.2.2 Mechanical part ...........................................3-7
3.1.2.3 Exhaust and intake system ...................................3-9
3.1.2.4 Cooling system ..........................................3-11
3.1.2.5 Lubrication system ........................................3-12
3.1.2.6 Fuel system .............................................3-13
3.1.2.7 Electric control circuit ......................................3-14
3.1.2.8 CCV system .............................................3-15
3.1.3 Layout of components ............................................3-16
3.1.3.1 Layout of components in the VRT engine compartment .............3-16
3.1.4 Tests and diagnostics ............................................3-17
3.1.4.1 Measuring the engine oil pressure .............................3-17
Table of contents
MF 6700 S series tractors
ACT0025630
Find manuals at https://best-manuals.com

3.1.5 Adjustments, bleeding and calibrations ................................3-18
3.1.5.1 Adjustments .............................................3-18
3.1.5.2 Bleeding ...............................................3-19
3.1.6 Disassembly/reassembly ..........................................3-20
3.1.6.1 AGCO Power Workshop Service Manual ........................3-20
3.1.7 Service tools ...................................................3-20
3.1.7.1 General ................................................3-20
3.1.7.2 Cylinder block tools ........................................3-20
3.1.7.3 Timing gear and flywheel housing tools .........................3-21
3.1.7.4 Cylinder head and valve mechanism tools .......................3-22
3.1.7.5 Crank mechanism tools .....................................3-23
3.1.7.6 Coolant pump tools ........................................3-24
3.1.7.7 Engine control system tools .................................3-25
3.1.7.8 Maintenance and troubleshooting tools .........................3-25
3.2 SCR Technology ..................................................3-27
3.2.1 General .......................................................3-27
3.2.1.1 Notice to the technician ....................................3-27
3.2.1.2 Safety instructions for DEF or AdBlue™ . Identification of hazards ......3-28
3.2.1.3 Abbreviations or terms used .................................3-31
3.2.2 Principles of operation ............................................3-31
3.2.2.1 Principles of operation .....................................3-31
3.2.2.2 Architecture of the VRT 4-cylinder SCR Technology system ..........3-35
3.2.3 Schematic diagrams .............................................3-36
3.2.3.1 VRT 4-cylinder SCR Technology system schematic diagram ..........3-36
3.2.4 Layout of components ............................................3-38
3.2.4.1 SCR Technology components for VRT engine .....................3-38
3.2.5 Disassembly/reassembly ..........................................3-40
3.2.5.1 Removing the metering module ..............................3-40
3.2.5.2 Injector ................................................3-42
3.2.5.3 Coolant solenoid valve .....................................3-44
3.2.5.4 DEF or AdBlue™ tank ......................................3-45
3.2.5.5 Removing the DEF or AdBlue™ gage ...........................3-47
3.2.5.6 Catalytic converter or DOC (catalyseur d'oxydation diesel) ...........3-48
3.2.6 Service tools ...................................................3-49
3.2.6.1 General ................................................3-49
3.2.6.2 3rd generation SCR engine - Service tools .......................3-49
4 Clutch ................................................................... 4-1
4.1 Chapter not used for this model .....................................4-3
5 Gearbox ................................................................. 5-1
5.1 ML140 .............................................................5-5
5.1.1 General ........................................................5-5
5.1.1.1 General .................................................5-5
5.1.1.2 Transmission operating principle ...............................5-5
5.1.1.3 Transmission operating principle diagram .........................5-9
5.1.1.4 Forward/reverse high-pressure relief valves ......................5-15
5.1.1.5 Control spool valve ........................................5-17
5.1.1.6 Flushing valve ............................................5-20
5.1.2 Layout of components ............................................5-23
5.1.2.1 Gearbox main components - parts list ..........................5-23
5.1.2.2 Gearbox main components - diagram ...........................5-24
5.1.3 Tests and diagnostics ............................................5-25
5.1.3.1 Hydraulic tests ...........................................5-25
5.1.4 Disassembly/reassembly ..........................................5-35
5.1.4.1 Disassembling the Dyna-VT module ............................5-35
5.1.4.2 Reassembling the Dyna-VT unit ...............................5-43
Table of contents
MF 6700 S series tractors
ACT0025630
Find manuals at https://best-manuals.com

5.1.4.3 Filling the gearbox ........................................5-54
5.1.4.4 Removing/refitting forward (2V3)/reverse (2V4) high-pressure relief valves
.............................................................5-55
5.1.4.5 Removing/refitting the flushing valve ...........................5-56
5.1.5 Service tools ...................................................5-56
5.1.5.1 General ................................................5-56
5.1.5.2 ML130/ML140/ML160/ML180 - Service tools .....................5-57
5.2 GBA25/General ...................................................5-67
5.2.1 General .......................................................5-67
5.2.2 Principles of operation ............................................5-70
5.2.2.1 Construction and description .................................5-70
5.2.2.2 Kinematics of the Dyna-4 GBA25 gearbox .......................5-75
5.2.2.3 Kinematics of the Dyna-6 GBA25 gearbox .......................5-78
5.2.2.4 Synchronisers ............................................5-81
5.2.2.5 Main gearbox robotic control .................................5-83
5.2.3 Layout of components ............................................5-85
5.2.3.1 View of Dyna-4 GBA25 gearbox assembly .......................5-85
5.2.3.2 View of Dyna-4 GBA25 gearbox assembly .......................5-87
5.2.3.3 View of Dyna-6 GBA25 gearbox assembly .......................5-89
5.2.3.4 View of Dyna-6 GBA25 gearbox assembly .......................5-91
5.2.3.5 Dyna-4 GBA25 gearbox specifications ..........................5-93
5.2.3.6 Dyna-6 GBA25 gearbox specifications ..........................5-94
5.2.3.7 GBA25 gearbox specifications ................................5-95
5.2.4 Disassembly/reassembly ..........................................5-97
5.2.4.1 Dyna-4 GBA25 gearbox disassembly ...........................5-97
5.2.4.2 Dyna-6 GBA25 gearbox disassembly ..........................5-102
5.2.4.3 Synchronizers ...........................................5-106
5.3 GBA25/PowerShuttle .............................................5-109
5.3.1 General ......................................................5-109
5.3.2 Principles of operation ...........................................5-109
5.3.3 Layout of components ...........................................5-113
5.3.3.1 View of the GBA25 PowerShuttle assembly .....................5-113
5.3.3.2 Blown-up view of the GBA25 PowerShuttle .....................5-115
5.3.4 Disassembly/reassembly .........................................5-117
5.3.4.1 Dyna-4 transmission ......................................5-117
5.3.4.2 Dyna-6 transmission ......................................5-122
5.3.4.3 Disassembling the PowerShuttle .............................5-127
5.3.4.4 Reassembling the PowerShuttle .............................5-129
5.3.4.5 Final steps .............................................5-131
5.3.5 Service tools ..................................................5-131
5.3.5.1 General ...............................................5-131
5.3.5.2 PowerShuttle - Service tools ................................5-131
5.4 GBA25/Dyna-4 PowerShift module ................................5-132
5.4.1 Dyna-4 General information .......................................5-132
5.4.2 Dyna-4 Operating principle ........................................5-132
5.4.2.1 Kinematics .............................................5-134
5.4.3 Layout of components ...........................................5-141
5.4.3.1 View of Dyna-4 assembly ..................................5-141
5.4.3.2 Dyna-4 blown-up view ....................................5-143
5.4.4 Removing/refitting Dyna-4 ........................................5-145
5.4.4.1 Preliminary steps ........................................5-145
5.4.4.2 Removing the Dynashift module .............................5-145
5.4.4.3 Refitting the Dynashift module ..............................5-147
5.4.4.4 Disassembling the Dynashift module .........................5-148
5.4.4.5 Reassembling the Dynashift module ..........................5-153
5.4.4.6 Disassembling the planet gears ..............................5-157
5.4.4.7 Reassembling the planet gears ..............................5-158
Table of contents
MF 6700 S series tractors
ACT0025630
Find manuals at https://best-manuals.com

5.4.4.8 Final steps .............................................5-159
5.4.5 Service tools ..................................................5-160
5.4.5.1 General ...............................................5-160
5.4.5.2 Powershift module - Service tools ............................5-160
5.5 GBA25/Dyna-6 PowerShift module ................................5-161
5.5.1 Dyna-6 - General information ......................................5-161
5.5.2 Dyna-6 Operating principle ........................................5-161
5.5.2.1 Kinematics .............................................5-163
5.5.3 Layout of components ...........................................5-171
5.5.3.1 View of Dyna-6 assembly ..................................5-171
5.5.3.2 Dyna-6 blown-up view ....................................5-173
5.5.4 Removing/refitting Dyna-6 ........................................5-175
5.5.4.1 Preliminary steps ........................................5-175
5.5.4.2 Removing the Powershift module ............................5-175
5.5.4.3 Refitting the Powershift module .............................5-177
5.5.4.4 Disassembling the Dynashift module ..........................5-178
5.5.4.5 Reassembling the Dynashift module ..........................5-182
5.5.4.6 Disassembling the multiplier module ..........................5-185
5.5.4.7 Reassembling the multiplier module ..........................5-186
5.5.4.8 Disassembling the planet gears ..............................5-189
5.5.4.9 Reassembling the planet gears ..............................5-189
5.5.4.10 Final steps ............................................5-190
5.5.5 Service tools ..................................................5-191
5.5.5.1 General ...............................................5-191
5.5.5.2 Powershift module - Service tools ............................5-191
5.6 GBA25/Robotic mechanical gearbox ...............................5-193
5.6.1 General ......................................................5-193
5.6.2 Principles of operation ...........................................5-193
5.6.2.1 Description and kinematics of ratios ...........................5-195
5.6.3 Layout of components ...........................................5-199
5.6.3.1 View of the primary and secondary shaft assembly ................5-199
5.6.3.2 View of the reverse layshaft and synchroniser control assembly ......5-202
5.6.3.3 Blown-up view of the robotic mechanical gearbox ................5-204
5.6.4 Disassembly/reassembly .........................................5-207
5.6.4.1 Preliminary steps ........................................5-207
5.6.4.2 Removing the primary and secondary shafts ....................5-207
5.6.4.3 Refitting the primary and secondary shafts ......................5-210
5.6.4.4 Disassembling the primary and secondary shafts .................5-212
5.6.4.5 Reassembling the primary and secondary shafts .................5-215
5.6.4.6 Shimming the primary and secondary shafts in the housing ..........5-219
5.6.4.7 Adjusting the selector rails and forks ..........................5-221
5.6.4.8 Adjusting the interlock mechanism ...........................5-225
5.6.4.9 Final steps .............................................5-226
5.6.5 Service tools ..................................................5-227
5.6.5.1 General ...............................................5-227
5.6.5.2 Robotic mechanical gearbox - Service tools .....................5-227
5.7 GBA25/Super creeper gears .......................................5-228
5.7.1 General ......................................................5-228
5.7.2 Principles of operation ...........................................5-229
5.7.3 Layout of components ...........................................5-232
5.7.3.1 View of the assembly .....................................5-232
5.7.3.2 Blown-up view ..........................................5-233
5.7.4 Disassembly/reassembly .........................................5-234
5.7.4.1 Removing/refitting and disassembling/reassembling the epicyclic gear
trains .......................................................5-234
5.7.4.2 Disassembling the input planet carrier .........................5-235
5.7.4.3 Reassembling the input planet carrier .........................5-236
Table of contents
MF 6700 S series tractors
ACT0025630
Find manuals at https://best-manuals.com

5.7.4.4 Disassembling the output planet carrier ........................5-237
5.7.4.5 Reassembling the output planet carrier ........................5-238
5.7.4.6 Final steps .............................................5-240
5.7.4.7 Adjusting the control ......................................5-240
6 Rear Axle ................................................................ 6-1
6.1 HA140 .............................................................6-7
6.1.1 General ........................................................6-7
6.1.1.1 General .................................................6-7
6.1.1.2 Principles of operation ......................................6-7
6.1.1.3 Schematic diagram .........................................6-8
6.1.2 Layout of components .............................................6-9
6.1.2.1 Rear axle main components ..................................6-9
6.1.3 Disassembly/reassembly ..........................................6-10
6.1.3.1 Cross section view of the rear axle ............................6-10
6.2 HA140/Final drives ................................................6-11
6.2.1 General .......................................................6-11
6.2.2 Layout of components ............................................6-13
6.2.2.1 Cross-section view of a final drive unit ..........................6-13
6.2.3 Disassembly/reassembly ..........................................6-15
6.2.3.1 Removing a final drive unit ..................................6-15
6.2.3.2 Refitting a final drive unit ....................................6-15
6.2.4 Service tools ...................................................6-15
6.2.4.1 General ................................................6-15
6.2.4.2 Final drives - Service tools ...................................6-16
6.3 HA140/Differential ................................................6-18
6.3.1 General .......................................................6-18
6.3.1.1 General ................................................6-18
6.3.1.2 Principles of operation .....................................6-18
6.3.1.3 Schematic diagram ........................................6-20
6.3.2 Layout of components ............................................6-21
6.3.2.1 Cross section view of the differential. ..........................6-21
6.3.2.2 Blown-up view of the pinion .................................6-22
6.3.2.3 Blown-up view of the differential ..............................6-23
6.3.3 Disassembly/reassembly ..........................................6-24
6.3.3.1 Removing the differential ...................................6-24
6.3.3.2 Refitting the differential ....................................6-27
6.3.3.3 Disassembling the pinion ...................................6-35
6.3.3.4 Reassembling the pinion ....................................6-41
6.3.3.5 Disassembling the differential ................................6-49
6.3.3.6 Reassembling the differential ................................6-55
6.3.4 Service tools ...................................................6-62
6.3.4.1 General ................................................6-62
6.3.4.2 Differential - Service tools ...................................6-63
6.4 HA140/Tractor braking ............................................6-66
6.4.1 General .......................................................6-66
6.4.1.1 General ................................................6-66
6.4.1.2 Principles of operation .....................................6-67
6.4.1.3 Hydraulic assistance .......................................6-69
6.4.2 Layout of components ............................................6-70
6.4.2.1 Blown-up view of the rear axle brake system .....................6-70
6.4.2.2 Layout of components .....................................6-71
6.4.3 Adjustments, bleeding and calibrations ................................6-73
6.4.3.1 Adjustments .............................................6-73
6.4.3.2 Bleeding ...............................................6-75
6.4.4 Disassembly/reassembly ..........................................6-79
6.4.4.1 Removing the rear axle brakes ...............................6-79
Table of contents
MF 6700 S series tractors
ACT0025630
Find manuals at https://best-manuals.com

6.4.4.2 Assembling the rear axle brakes ..............................6-83
6.4.4.3 Removing/refitting the assisted-brake master cylinders ..............6-88
6.4.5 Service tools ...................................................6-91
6.4.5.1 General ................................................6-91
6.4.5.2 Tractor braking - Service tools ................................6-91
6.5 HA140/Hydraulic trailer braking ....................................6-93
6.5.1 General .......................................................6-93
6.5.1.1 Trailer brake unit ..........................................6-93
6.5.2 Hydraulic test ..................................................6-94
6.6 GPA20 - General ..................................................6-96
6.6.1 General .......................................................6-96
6.6.2 Principles of operation ............................................6-96
6.6.3 Layout of components ............................................6-97
6.6.3.1 Center housing assembly (longitudinal cross-section) ...............6-97
6.6.3.2 Center housing assembly (transverse cross-section) ................6-98
6.7 GPA20/Heavy Duty and Heavy Duty + final drives ...................6-99
6.7.1 General .......................................................6-99
6.7.1.1 General ................................................6-99
6.7.1.2 Principles of operation .....................................6-99
6.7.2 Layout of components ...........................................6-101
6.7.2.1 View of the assembly .....................................6-101
6.7.2.2 Blown-up view ..........................................6-103
6.7.3 Disassembly/reassembly .........................................6-105
6.7.3.1 Removing/refitting a final drive ..............................6-105
6.7.3.2 Removing/refitting and disassembling/reassembling a planet carrier ...6-106
6.7.3.3 Replacing tapered roller bearings and seals .....................6-109
6.7.3.4 Shimming the tapered roller bearings of the axle shaft .............6-112
6.7.3.5 Replacing a wheel stud ....................................6-116
6.7.4 Service tools ..................................................6-116
6.7.4.1 General ...............................................6-116
6.7.4.2 GPA20/Final drives - Service tools ............................6-117
6.8 GPA20/Super Heavy Duty final drives ..............................6-118
6.8.1 General ......................................................6-118
6.8.1.1 General ...............................................6-118
6.8.1.2 Principles of operation .....................................6-118
6.8.2 Layout of components ...........................................6-119
6.8.2.1 View of the assembly .....................................6-119
6.8.2.2 Blown-up view ..........................................6-121
6.8.3 Disassembly/reassembly .........................................6-123
6.8.3.1 Removing/refitting a final drive ..............................6-123
6.8.3.2 Disassembling/reassembling the planet carrier ...................6-124
6.8.3.3 Fitting and shimming the tapered roller bearings of the axle shaft .....6-126
6.8.3.4 Replacing a wheel stud ....................................6-128
6.8.4 Service tools ..................................................6-129
6.8.4.1 General ...............................................6-129
6.8.4.2 GPA20/Final drives - Service tools ............................6-129
6.9 GPA20/Differential ...............................................6-130
6.9.1 General ......................................................6-130
6.9.2 Layout of components ...........................................6-131
6.9.2.1 View of the assembly .....................................6-131
6.9.2.2 Blown-up view ..........................................6-133
6.9.3 Disassembly/reassembly .........................................6-135
6.9.3.1 Removing the left-hand flange and differential lock assembly ........6-135
6.9.3.2 Disassembling and reassembling the differential lock assembly .......6-136
6.9.3.3 Refitting the left-hand flange and the differential lock assembly .......6-137
6.9.3.4 Removing the differential assembly ...........................6-138
6.9.3.5 Disassembling the differential assembly and the crown wheel .......6-139
Table of contents
MF 6700 S series tractors
ACT0025630
Find manuals at https://best-manuals.com

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
Find manuals at https://best-manuals.com

6.12.5.1 Assisted brake master cylinders: ............................6-210
6.12.5.2 High-pressure braking ....................................6-214
6.12.5.3 Pedals ...............................................6-216
6.12.6 Service tools .................................................6-217
6.12.6.1 General ..............................................6-217
6.12.6.2 Tractor braking - Service tools ..............................6-217
6.13 GPA20/Hitch/Linkage ...........................................6-218
6.13.1 Linkage - General ..............................................6-218
6.13.2 Hitch - General ...............................................6-218
6.13.3 Layout of components ..........................................6-219
6.13.3.1 View of the assembly ....................................6-219
6.13.3.2 Blown-up view .........................................6-221
6.13.4 Adjustments, bleeding and calibrations ..............................6-223
6.13.4.1 Adjusting the angular position sensor .........................6-223
6.13.5 Disassembly/reassembly ........................................6-224
6.13.5.1 Removing the linkage cover plate ...........................6-224
6.13.5.2 Disassembling the linkage cover plate ........................6-227
6.13.5.3 Reassembling the linkage cover plate .........................6-228
6.13.5.4 Shimming the linkage shaft ................................6-230
6.13.5.5 Refitting the linkage cover plate .............................6-230
6.13.5.6 Disassembling and reassembling a lift ram .....................6-231
6.14 GPA20+/Hitch/Increased capacity linkage - General ...............6-233
6.14.1 Linkage - General ..............................................6-233
6.14.2 Hitch - General ...............................................6-234
6.14.3 Layout of components ..........................................6-235
6.14.3.1 View of the assembly ....................................6-235
6.14.3.2 Blown-up view .........................................6-237
6.14.4 Adjustments, bleeding and calibrations ..............................6-239
6.14.4.1 Adjusting the angular position sensor .........................6-239
6.14.4.2 Adjusting the forward speed sensor ..........................6-243
6.14.5 Disassembly/reassembly ........................................6-244
6.14.5.1 Removing and refitting the increased capacity linkage cover plate ....6-244
6.14.5.2 Removing and refitting the increased capacity linkage cover plate ....6-248
6.14.5.3 Shimming the linkage shaft ................................6-256
6.14.5.4 Disassembling and reassembling a lift ram .....................6-258
6.14.6 Service tools .................................................6-260
6.14.6.1 General ..............................................6-260
6.14.6.2 GPA20 +/Hitch/Increased capacity linkage - Service tools ..........6-260
6.15 Pneumatic trailer braking ........................................6-261
6.15.1 General .....................................................6-261
6.15.1.1 GPA20/20+ ............................................6-261
6.15.1.2 GPA40 and HA140/180 ...................................6-265
6.15.2 Layout of components ..........................................6-271
6.15.3 Test and diagnostics ...........................................6-272
6.15.3.1 Pneumatic system test ...................................6-272
6.15.3.2 Sealing test on the pneumatic system. ........................6-274
6.15.4 Adjustments, bleeding and calibrations ..............................6-274
6.15.4.1 Adjusting the pressure relief valve ...........................6-274
6.15.4.2 Adjusting the hand brake rod ...............................6-276
6.15.5 Disassembly/reassembly ........................................6-277
6.15.5.1 General ..............................................6-277
6.15.5.2 Compressor ...........................................6-277
6.15.6 Service tools .................................................6-279
6.15.6.1 General ..............................................6-279
6.15.6.2 Pneumatic trailer brake — Service tools .......................6-279
6.16 Auto-hitch ......................................................6-282
6.16.1 General .....................................................6-282
Table of contents
MF 6700 S series tractors
ACT0025630

6.16.2 Principles of operation ..........................................6-282
6.16.3 Layout of components ..........................................6-283
6.16.3.1 Blown-up view .........................................6-283
6.16.4 Adjustments, bleeding and calibrations ..............................6-284
6.16.4.1 Adjusting the tie rods and the control .........................6-284
6.16.5 Disassembly/reassembly ........................................6-286
6.16.5.1 Refitting the frame ......................................6-286
6.17 Rear wheels/hubs ...............................................6-288
6.17.1 General .....................................................6-288
6.17.2 Disassembly/reassembly ........................................6-291
6.17.2.1 Flanged axle shaft .......................................6-291
6.17.2.2 Straight axle shaft .......................................6-294
6.17.2.3 Adjusting the rear wheel track width .........................6-296
6.17.2.4 Fitting the rear wheel weights ..............................6-300
7 Power take-off ............................................................7-1
7.1 HA140 .............................................................7-3
7.1.1 General ........................................................7-3
7.1.2 Principles of operation .............................................7-4
7.1.3 Layout of components .............................................7-7
7.1.3.1 Cross-section view .........................................7-7
7.1.4 Disassembly/reassembly ...........................................7-9
7.1.4.1 Disassembling/reassembling the PTO clutch ......................7-9
7.1.4.2 Disassembling the PTO shafts ................................7-13
7.1.4.3 Reassembling the PTO shafts ................................7-17
7.2 GPA20 ............................................................7-22
7.2.1 General .......................................................7-22
7.2.2 Principles of operation ............................................7-23
7.3 GPA20/Clutch .....................................................7-30
7.3.1 General .......................................................7-30
7.3.2 Principles of operation ............................................7-30
7.3.3 Layout of components ............................................7-32
7.3.3.1 Parts list ................................................7-32
7.3.3.2 Blown-up view ...........................................7-34
7.3.4 Layout of components ............................................7-35
7.3.4.1 View of the assembly ......................................7-35
7.3.5 Disassembly/reassembly ..........................................7-37
7.3.5.1 Removing and refitting the PTO clutch ..........................7-37
7.3.5.2 Disassembling/reassembling the clutch .........................7-38
7.3.6 Service tools ...................................................7-40
7.3.6.1 General ................................................7-40
7.3.6.2 GPA20/Clutch - Service tools .................................7-41
7.4 GPA20/Intermediate shaft/Drive gear/PTO brake ....................7-42
7.4.1 General .......................................................7-42
7.4.2 Principles of operation ............................................7-42
7.4.3 Layout of components ............................................7-44
7.4.3.1 Power take-off (PTO) parts list ................................7-44
7.4.3.2 Exploded view (2-speed version) ..............................7-45
7.4.3.3 Overview (2-speed version) ..................................7-45
7.4.3.4 Exploded view (4-speed version) ..............................7-46
7.4.3.5 Assembly view (4-speed version) ..............................7-47
7.4.4 Disassembly/reassembly ..........................................7-47
7.4.4.1 Removing and refitting the upper shaftline (2-speed version) ..........7-47
7.4.4.2 Removing/refitting the driving gears (4-speed version) ..............7-49
7.4.4.3 Shimming the driving gear ...................................7-52
7.4.4.4 Adjustment of the control (4-speed version) ......................7-53
7.5 GPA20/Output shaft without speed selection .......................7-55
Table of contents
MF 6700 S series tractors
ACT0025630

7.5.1 General .......................................................7-55
7.5.2 Layout of components ............................................7-55
7.5.2.1 View of the assembly ......................................7-55
7.5.2.2 Blown-up view ...........................................7-56
7.5.3 Disassembly/reassembly ..........................................7-57
7.5.3.1 Removing/refitting the rear bearing ............................7-57
7.5.3.2 Disassembling and reassembling the gears ......................7-58
7.6 GPA20/Output shaft with speed selection ..........................7-60
7.6.1 General .......................................................7-60
7.6.2 Layout of components ............................................7-60
7.6.2.1 Power take-off (PTO) parts list ................................7-60
7.6.2.2 View of the assembly ......................................7-62
7.6.2.3 Blown-up view ...........................................7-65
7.6.3 Disassembly/reassembly ..........................................7-66
7.6.3.1 Removing/refitting the rear bearing ............................7-66
7.6.3.2 Disassembling and reassembling the gears ......................7-67
7.6.3.3 Shimming the shaft with reinforced sealing ......................7-70
7.6.3.4 Adjusting the control .......................................7-70
7.7 GPA20/PTO electrohydraulic controls ..............................7-72
7.7.1 General .......................................................7-72
7.7.2 Principles of operation ............................................7-72
7.7.3 Layout of components ............................................7-74
7.7.3.1 View of the assembly ......................................7-74
7.7.3.2 Blown-up view ...........................................7-75
7.7.4 Disassembly/reassembly ..........................................7-75
7.7.4.1 Removing/refitting the 540/1000 control ........................7-75
7.7.4.2 Removing/refitting the Standard/Economy control .................7-77
7.8 GPA20/GSPTO ....................................................7-79
7.8.1 General .......................................................7-79
7.8.2 Principles of operation ............................................7-79
7.8.3 Layout of components ............................................7-80
7.8.3.1 View of the assembly ......................................7-80
7.8.3.2 Blown-up view ...........................................7-81
7.8.4 Disassembly/reassembly ..........................................7-81
7.8.4.1 Disassembling and reassembling the PTO .......................7-81
7.8.4.2 Assembling and adjusting the control ...........................7-84
7.9 Zuidberg front power take-off ......................................7-87
7.9.1 General .......................................................7-87
7.9.1.1 General ................................................7-87
7.9.1.2 Principles of operation .....................................7-87
7.9.1.3 Schematic diagrams .......................................7-90
7.9.2 Layout of components ............................................7-91
7.9.2.1 Blown-up view of the PTO unit ...............................7-91
7.9.2.2 Blown-up view of the hydraulic pump and the PTO clutch ............7-92
7.9.2.3 Blown-up view of the drive shaft and the oil cooler .................7-93
7.9.3 Tests and diagnostics ............................................7-94
7.9.3.1 Hydraulic tests ...........................................7-94
7.9.3.2 Electrical tests ...........................................7-95
7.9.4 Adjustments, bleeding and calibrations ................................7-95
7.9.4.1 Draining and changing the filter ...............................7-95
7.9.5 Disassembly/reassembly ..........................................7-96
7.9.5.1 Removing and refitting the front power take-off unit ................7-96
7.9.5.2 Disassembling and reassembling the front power take-off unit ........7-97
8 Front axle ................................................................8-1
8.1 DANA 735 front axle ............................................... 8-3
8.1.1 General ........................................................8-3
Table of contents
MF 6700 S series tractors
ACT0025630

8.1.1.1 DANA General ............................................8-3
8.1.1.2 Principles of operation ......................................8-3
8.1.1.3 DANA front axle 740/528-529-530-613-614-615 Dimensions -
Specifications - Identification ........................................8-4
8.1.1.4 Topping up and checking levels ................................8-7
8.1.2 Layout of components .............................................8-8
8.1.2.1 Layout of front axle components ...............................8-8
8.1.2.2 View of front axle assembly .................................8-10
8.1.3 Tests and diagnostics ............................................8-12
8.1.3.1 Troubleshooting ..........................................8-12
8.1.4 Disassembly/reassembly ..........................................8-14
8.1.4.1 DANA 735 tightening torques ................................8-14
8.1.4.2 DANA Workshop Service Manuals .............................8-16
8.2 DANA 740 front axle ...............................................8-17
8.2.1 General .......................................................8-17
8.2.1.1 DANA General ...........................................8-17
8.2.1.2 Principles of operation .....................................8-17
8.2.1.3 DANA front axle 740/553-554-614-615- Dimensions - Specifications -
Identification ..................................................8-18
8.2.1.4 Topping up and checking levels ...............................8-21
8.2.2 Layout of components ............................................8-22
8.2.2.1 Layout of front axle components ..............................8-22
8.2.2.2 View of front axle assembly .................................8-24
8.2.3 Tests and diagnostics ............................................8-26
8.2.3.1 Troubleshooting ..........................................8-26
8.2.4 Disassembly/reassembly ..........................................8-28
8.2.4.1 DANA 740 tightening torques ................................8-28
8.2.4.2 DANA Workshop Service Manuals .............................8-30
8.3 HA140/4-wheel drive clutch ........................................8-31
8.3.1 General .......................................................8-31
8.3.1.1 General - 4-wheel drive clutch ................................8-31
8.3.1.2 Four-wheel drive function operating principles ....................8-31
8.3.2 Layout of components ............................................8-33
8.3.2.1 Cross-section view of the 4-wheel drive clutch ....................8-33
8.3.2.2 Blown-up view of the 4-wheel drive clutch .......................8-34
8.3.3 Disassembly/reassembly ..........................................8-35
8.3.3.1 Disassembling the 4WD clutch ...............................8-35
8.3.3.2 Reassembling the 4WD clutch ...............................8-39
8.4 HA140/Universal joint shaft brake ..................................8-46
8.4.1 Layout of components ............................................8-46
8.4.1.1 Cross-section view of the universal joint shaft brake ................8-46
8.4.1.2 Exploded view of the universal joint shaft brake ...................8-47
8.4.2 Disassembly/reassembly ..........................................8-47
8.4.2.1 Disassembling the universal joint shaft brake .....................8-47
8.4.2.2 Reassembling the universal joint shaft brake .....................8-52
8.5 GPA20/4-wheel drive clutch .......................................8-59
8.5.1 General .......................................................8-59
8.5.2 Principles of operation ............................................8-59
8.5.3 Layout of components ............................................8-60
8.5.3.1 View of the assembly ......................................8-60
8.5.3.2 Blown-up view ...........................................8-62
8.5.4 Disassembly/reassembly ..........................................8-63
8.5.4.1 Removing the clutch assembly ...............................8-63
8.5.4.2 Disassembling the clutch ...................................8-65
8.5.4.3 Reassembling the clutch ....................................8-66
8.5.4.4 Refitting the clutch assembly ................................8-67
8.5.5 Service tools ...................................................8-69
Table of contents
MF 6700 S series tractors
ACT0025630

8.5.5.1 General ................................................8-69
8.5.5.2 4-wheel drive clutch - Service tools ............................8-69
8.6 Steering unit/Closed Center .......................................8-71
8.6.1 General .......................................................8-71
8.6.2 Hydraulic operating principle .......................................8-72
8.6.2.1 Reaction/non-reaction steering unit ............................8-73
8.6.3 Electrohydraulic operating principle ...................................8-75
8.6.4 Layout of steering unit components ..................................8-77
8.6.5 Removing and refitting the steering unit ...............................8-77
8.6.5.1 Refitting ................................................8-78
8.7 Steering unit/Open Center .........................................8-79
8.7.1 General .......................................................8-79
8.7.2 Principles of operation ............................................8-80
8.7.2.1 Reaction/non-reaction steering unit ............................8-82
8.7.3 Schematic diagram ..............................................8-84
8.7.4 Layout of steering unit components ..................................8-85
8.7.5 Removing and refitting the steering unit ...............................8-85
8.7.5.1 Refitting ................................................8-86
9 Hydraulics ................................................................9-1
9.1 HA140/Load Sensing ...............................................9-5
9.1.1 General ........................................................9-5
9.1.2 Principles of operation .............................................9-5
9.1.3 Trailer brake unit .................................................9-7
9.1.4 Layout of components .............................................9-9
9.1.4.1 Steering and cooling system ..................................9-9
9.1.4.2 High-pressure system ......................................9-11
9.1.4.3 Distribution unit — Power Beyond .............................9-12
9.1.5 Hydraulic tests .................................................9-14
9.1.5.1 General ................................................9-14
9.1.5.2 Auxiliary hydraulic system ...................................9-14
9.1.5.3 Steering system ..........................................9-19
9.1.6 Disassembly/reassembly ..........................................9-19
9.1.6.1 Variable displacement pump .................................9-19
9.1.6.2 Fixed displacement pumps ..................................9-21
9.1.7 Service tools ...................................................9-23
9.1.7.1 General ................................................9-23
9.1.7.2 Hydraulic test – Service tools ................................9-24
9.2 GPA20/Load Sensing ..............................................9-30
9.2.1 General .......................................................9-30
9.2.2 Principles of operation ............................................9-30
9.2.3 Layout of components ............................................9-32
9.2.3.1 Filtration and cooling .......................................9-32
9.2.3.2 Transmission lubrication system ..............................9-34
9.2.3.3 High-pressure system ......................................9-36
9.2.3.4 Low pressure system ......................................9-37
9.2.3.5 Distribution unit — Power Beyond .............................9-40
9.2.4 Hydraulic tests .................................................9-40
9.2.4.1 General ................................................9-40
9.2.4.2 High pressure system ......................................9-41
9.2.4.3 Low pressure system (20 bar) ................................9-47
9.2.4.4 Cooling and lubrication system ...............................9-52
9.2.5 Service tools ...................................................9-54
9.2.5.1 General ................................................9-54
9.2.5.2 Hydraulic test – Service tools ................................9-54
9.3 GPA20/Load Sensing/Right-hand cover plate .......................9-61
9.3.1 General .......................................................9-61
Table of contents
MF 6700 S series tractors
ACT0025630

9.3.2 Principles of operation ............................................9-61
9.3.3 Description and operation of the variable displacement pump ...............9-63
9.3.4 Priority block ...................................................9-66
9.3.5 Layout of components ............................................9-71
9.3.5.1 View of the assembly ......................................9-71
9.3.5.2 Blown-up view ...........................................9-73
9.3.6 Identification of channels and ports ..................................9-75
9.3.7 Disassembly/reassembly ..........................................9-77
9.3.7.1 Removing and refitting the hydraulic cover plate ...................9-77
9.3.7.2 Removing and refitting the variable displacement pump .............9-80
9.3.8 Service tools ...................................................9-82
9.3.8.1 General ................................................9-82
9.3.8.2 Load Sensing/Right-hand cover plate - Service tools ................9-83
9.4 GPA20/Load Sensing/Left-hand cover plate .........................9-84
9.4.1 General .......................................................9-84
9.4.2 Principles of operation ............................................9-84
9.4.3 Layout of components ............................................9-86
9.4.3.1 View of the assembly ......................................9-86
9.4.3.2 GPA20 exploded view ......................................9-87
9.4.3.3 Identification of ports and channels on the cover plate ..............9-88
9.4.4 Disassembly/reassembly ..........................................9-88
9.4.4.1 Removing/refitting the LS cover plate ..........................9-88
9.4.4.2 Removing and refitting the charge pump ........................9-88
9.4.4.3 Replacing the charge pump seals .............................9-91
9.5 Load Sensing/Linkage spool valve .................................9-94
9.5.1 General .......................................................9-94
9.5.2 Principles of operation ............................................9-95
9.5.3 Schematic diagram ..............................................9-97
9.5.4 Removing/refitting the linkage spool valve .............................9-98
9.5.4.1 Removal ...............................................9-98
9.5.4.2 Refitting ................................................9-99
9.5.4.3 Disassembly .............................................9-99
9.5.4.4 Reassembly .............................................9-99
9.5.4.5 Final steps ..............................................9-99
9.6 Load Sensing/Rear auxiliary spool valves ..........................9-101
9.6.1 General ......................................................9-101
9.6.2 Mechanical auxiliary spool valves ...................................9-104
9.6.2.1 Principles of operation .....................................9-104
9.6.2.2 Control cables ..........................................9-105
9.6.3 Electrohydraulic auxiliary spool valves ................................9-105
9.6.3.1 Principles of operation .....................................9-105
9.6.3.2 Working pressure block ....................................9-108
9.6.4 Adjustments and bleeding ........................................9-109
9.6.4.1 Spool valve cables .......................................9-109
9.6.5 Disassembly/reassembly .........................................9-111
9.6.5.1 Removing/refitting the rear spool valves ........................9-111
9.6.5.2 Spool valve lever .........................................9-113
9.7 Load Sensing/Front auxiliary spool valves .........................9-115
9.7.1 General ......................................................9-115
9.7.2 Principles of operation ...........................................9-117
9.7.3 Working pressure block ..........................................9-121
9.7.4 Removing/refitting the front spool valves .............................9-121
9.7.4.1 Removing the front spool valves — Dyna-4 and Dyna-6 .............9-122
9.7.4.2 Removing the front spool valves — Dyna-VT ....................9-123
9.7.4.3 Refitting the front spool valves ..............................9-124
9.7.4.4 Disassembling/reassembling the spool valve assembly .............9-125
9.8 GPA20/Open Center ..............................................9-127
Table of contents
MF 6700 S series tractors
ACT0025630

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

9.15 GPA20/Open Center/Auxiliary spool valves .......................9-205
9.15.1 General .....................................................9-205
9.15.2 Principles of operation ..........................................9-207
9.15.2.1 Operation of the flow divider ...............................9-207
9.15.2.2 3-position spool valve, SE/DE with return to neutral by spring .......9-208
9.15.2.3 3-position spool valve, SE/DE with automatic return to neutral .......9-211
9.15.2.4 3-position SE/DE spool valve with non-return valve and automatic return
............................................................9-212
9.15.2.5 Four-position DE spool valve, with automatic return to neutral and
floating position ...............................................9-214
9.15.3 Schematic diagram ............................................9-216
9.15.4 Layout of components ..........................................9-219
9.15.4.1 Blown-up view .........................................9-219
9.15.5 Layout of ports and channels .....................................9-221
9.15.6 Adjustments and bleeding .......................................9-223
9.15.6.1 Adjusting the flow divider .................................9-223
9.15.7 Disassembly/reassembly ........................................9-223
9.15.7.1 Removing/refitting the spool valves ..........................9-223
9.15.7.2 Fitting and adjusting the control cables ........................9-225
9.16 GPA20/Open Center/Valve ......................................9-230
9.16.1 General .....................................................9-230
9.16.2 Description of the 21-bar low pressure valve .........................9-230
9.16.3 Layout of components ..........................................9-232
9.16.3.1 Identification of ports ....................................9-233
9.16.4 Adjusting the 21 bar valve .......................................9-233
9.16.5 Disassembly/reassembly ........................................9-233
9.16.5.1 Removing/refitting and disassembling/reassembling the 21-bar valve . 9-233
9.16.5.2 Assembling the 5 bar valve ................................9-234
10 Electricity ..............................................................10-1
10.1 Diagnostic procedure .............................................10-3
10.1.1 List of generic procedures ........................................10-3
10.1.2 Checking the insulation of a harness .................................10-3
10.1.3 Checking the continuity of a harness ................................10-3
10.1.4 Checking the CAN network .......................................10-5
10.1.5 Checking a harness .............................................10-7
10.1.6 Measuring a voltage ............................................10-7
10.1.7 Measuring the resistance of a component ............................10-8
10.1.8 Measuring current ..............................................10-8
10.1.9 Hook-on ammeter procedure ......................................10-8
10.1.10 Ammeter procedure ...........................................10-9
10.2 Electrical circuit .................................................10-10
10.2.1 General .....................................................10-10
10.2.1.1 General ..............................................10-10
10.2.1.2 Principles of operation ....................................10-11
10.2.1.3 Electricity - color code ....................................10-11
10.2.1.4 Schematic diagram of the electrical circuit .....................10-12
10.2.2 Layout of components ..........................................10-13
10.3 Fuse box .......................................................10-15
10.3.1 General .....................................................10-15
10.3.1.1 General ..............................................10-15
10.3.1.2 Principles of operation ....................................10-15
10.3.2 Layout of components ..........................................10-16
10.3.2.1 Fuse box - Connectors ...................................10-16
10.3.3 Disassembly/reassembly ........................................10-17
10.3.3.1 Tightening torques ......................................10-17
10.3.3.2 Removing and refitting the fuse box ..........................10-17
Table of contents
MF 6700 S series tractors
ACT0025630

10.4 Alternator ......................................................10-19
10.4.1 Layout of components ..........................................10-19
10.4.2 Tests and diagnostics ..........................................10-20
10.4.2.1 Alternator - test procedure .................................10-20
10.4.3 Disassembly/reassembly ........................................10-22
10.4.3.1 Removing and refitting the drive belts ........................10-22
10.4.3.2 Removing and refitting the alternators ........................10-23
10.4.4 Service tools .................................................10-24
10.4.4.1 General ..............................................10-24
10.4.4.2 Belt - Service tools ......................................10-24
10.5 Starter - General ................................................10-25
10.5.1 General .....................................................10-25
10.5.1.1 General ..............................................10-25
10.5.1.2 Principles of operation ....................................10-25
10.5.1.3 Schematic diagram ......................................10-26
10.5.2 Layout of components ..........................................10-27
10.5.3 Tests and diagnostics ..........................................10-28
10.5.3.1 Starter diagnostics ......................................10-28
10.5.4 Disassembly/reassembly ........................................10-28
10.5.4.1 Removing/refitting the starter ..............................10-28
10.6 Battery isolator .................................................10-30
10.6.1 General .....................................................10-30
10.6.1.1 Battery isolator .........................................10-30
10.6.1.2 Principles of operation ....................................10-31
10.6.2 Layout of components ..........................................10-33
10.7 Triflash triangle - Disassembly/reassembly .......................10-34
10.7.1 Triflash on standard roof .........................................10-34
10.7.2 Triflash on high-visibility roof .....................................10-37
11 Electronics .............................................................11-1
11.1 Diagnostic tool ..................................................11-3
11.1.1 Diagnostic tool ................................................11-3
11.2 Telemetry .......................................................11-4
11.2.1 General ......................................................11-4
11.2.1.1 General ...............................................11-4
11.2.1.2 Principles of operation .....................................11-4
11.2.1.3 Schematic diagram .......................................11-6
11.2.2 Telemetry error codes ...........................................11-6
11.2.3 Layout of components ...........................................11-8
11.2.4 Programming and setting parameters ................................11-8
11.2.5 Disassembly/reassembly .........................................11-9
11.2.5.1 Access to the AGCOMMAND aerial ...........................11-9
11.2.5.2 Disassembling the AM50 AGCOMMAND unit ..................11-10
12 Operator environment ..................................................12-1
12.1 Standard air conditioning .........................................12-3
12.1.1 General ......................................................12-3
12.1.1.1 General ...............................................12-3
12.1.1.2 Principles of operation .....................................12-3
12.1.1.3 Technical specifications ....................................12-4
12.1.1.4 Schematic diagram of the air conditioning ......................12-7
12.1.1.5 Air conditioning hydraulics diagram ..........................12-10
12.1.2 Layout of components ..........................................12-11
12.1.2.1 Diagram of the air conditioning compressor ....................12-11
12.1.2.2 Layout of components ...................................12-12
12.1.3 Tests and diagnostics ..........................................12-13
12.1.3.1 Air conditioning tests - General .............................12-13
Table of contents
MF 6700 S series tractors
ACT0025630

12.1.3.2 Air conditioning tests - Air conditioning unit breakdown ............12-14
12.1.3.3 Air conditioning tests - Cleaning the system ....................12-15
12.1.4 Adjustments, bleeding and calibrations ..............................12-16
12.1.4.1 Safety instructions ......................................12-16
12.1.4.2 General maintenance ....................................12-17
12.1.4.3 Adjusting the clutch air gap ................................12-17
12.1.4.4 Draining the system and checking for leaks ....................12-18
12.1.4.5 Filling the unit (engine stopped) .............................12-19
12.1.4.6 Checking pressures .....................................12-21
12.1.5 Disassembly/reassembly ........................................12-22
12.1.5.1 Removing and refitting the roof trim ..........................12-22
12.1.5.2 Removing and refitting the drive belts ........................12-25
12.1.5.3 Air conditioning - Replacing the dryer .........................12-26
12.1.6 Service tools .................................................12-28
12.1.6.1 General ..............................................12-28
12.1.6.2 Belt - Service tools ......................................12-29
12.2 Self-regulating air conditioning ..................................12-30
12.2.1 General .....................................................12-30
12.2.1.1 General ..............................................12-30
12.2.1.2 Using the air conditioning system ...........................12-30
12.2.1.3 Fan control ............................................12-30
12.2.1.4 Activating the compressor .................................12-31
12.2.1.5 Defrosting ............................................12-31
12.2.1.6 Recirculation ...........................................12-31
12.2.1.7 Special conditions .......................................12-32
12.2.2 Layout of components ..........................................12-32
12.2.2.1 Diagram of the air conditioning compressor ....................12-32
12.2.2.2 Layout of components ...................................12-33
12.2.2.3 Self-regulating air conditioning - Layout of components ............12-34
12.2.3 Tests and diagnostics ..........................................12-35
12.2.3.1 Air conditioning tests - General .............................12-35
12.2.3.2 Air conditioning tests - Air conditioning unit breakdown ............12-35
12.2.3.3 Air conditioning tests - Cleaning the system ....................12-37
12.2.4 Adjustments, bleeding and calibrations ..............................12-37
12.2.4.1 Safety instructions ......................................12-37
12.2.4.2 General maintenance ....................................12-38
12.2.4.3 Adjusting the clutch air gap ................................12-39
12.2.4.4 Draining the system and checking for leaks ....................12-40
12.2.4.5 Filling the unit (engine stopped) .............................12-41
12.2.4.6 Checking pressures .....................................12-42
12.2.5 Disassembly/reassembly ........................................12-44
12.2.5.1 Removing and refitting the roof trim ..........................12-44
12.2.5.2 Removing and refitting the drive belts ........................12-47
12.2.5.3 Air conditioning - Replacing the dryer .........................12-48
12.2.6 Service tools .................................................12-50
12.2.6.1 General ..............................................12-50
12.2.6.2 Belt - Service tools ......................................12-51
12.3 Mechanical suspension ..........................................12-52
12.3.1 General .....................................................12-52
12.3.2 Layout of components ..........................................12-55
12.3.2.1 View of the assembly ....................................12-55
12.3.3 Disassembly/reassembly ........................................12-56
12.3.3.1 Tightening torques ......................................12-56
12.4 Active mechanical suspension ...................................12-57
12.4.1 General .....................................................12-57
12.4.2 Principles of operation ..........................................12-61
12.4.3 Schematic diagram ............................................12-63
Table of contents
MF 6700 S series tractors
ACT0025630