Complete workshop repair & service manual with electrical wiring diagrams for Caterpillar D6N Track-Type Tractors. It's the same service manual used by dealers that guaranteed to be fully functional and intact without any missing page.

This Caterpillar D6N Track-Type Tractors service & repair manual (including maintenance, overhaul, disassembling & assembling, adjustment, tune-up, operation, inspecting, diagnostic & troubleshooting…) is divided into different sections. Each section covers a specific component or system with detailed illustrations. A table of contents is placed at the beginning of each section. Pages are easily found by category, and each page is expandable for great detail. The printer-ready PDF documents work like a charm on all kinds of devices.

2,012 pages, bookmarked, Searchable, Printable, high quality PDF

MANUAL LIST:
M0069568 - Systems Operation (Cat Grade Control for D6N Track-Type Tractors)
M0069568 - Testing & Adjusting (Cat Grade Control for D6N Track-Type Tractors)
M0069568 - Troubleshooting (Cat Grade Control for D6N Track-Type Tractors)
UENR4079 - Disassembly & Assembly (D6N Track-Type Tractor Engine Supplement)
UENR4080 - Disassembly & Assembly (D6N Track-Type Tractor Power Train)
UENR4081 - Specifications (D6N Track-Type Tractor Systems)
UENR4081 - Systems Operation (D6N Track-Type Tractor Systems)
UENR4081 - Testing & Adjusting (D6N Track-Type Tractor Systems)
UENR4082 - Disassembly & Assembly (D6N Track-Type Tractor Machine Systems)
UENR4083 - Schematic (D6N Track-Type Tractor Power Train System)
UENR5402 - Schematic (D6N Track-Type Tractor Electrical System)
UENR5403 - Schematic (D6N Track-Type Tractor Hydraulic System)
UENR5491 - Troubleshooting (D6N Track-Type Tractor Electrohydraulic System)
UENR5957 - Systems Operation (D6N & D6K2 Track-Type Tractor Monitoring System)
UENR5957 - Testing & Adjusting (D6N & D6K2 Track-Type Tractor Monitoring System)
UENR5957 - Troubleshooting (D6N & D6K2 Track-Type Tractor Monitoring System)
UENR7902 - Schematic (D6N Track-Type Tractor Electrical System)
...

M0069568 - Systems Operation (Cat Grade Control for D6N Track-Type Tractors)............1
  Display Firmware Upgrade............2
  Features............5
  General Information............11
  System Components............12
M0069568 - Testing & Adjusting (Cat Grade Control for D6N Track-Type Tractors)............31
  Calibration............32
  System Accuracy - Test............39
M0069568 - Troubleshooting (Cat Grade Control for D6N Track-Type Tractors)............53
  CAN Data Link - Test............54
  Connector Locations............64
  Determining Diagnostic Trouble Codes............69
  Diagnostic Capabilities............80
  Diagnostic Trouble Codes............82
  ECM - Configure............85
  ECM - Replace............87
  ECM Software - Install............89
  Electrical Connector - Inspect............92
  Electrical Power Supply - Test............100
  Emerging Symptom Information............105
  General Information............106
  Machine Preparation for Troubleshooting............108
  Operator Control Switch (Switch to Ground) - Test............112
  Sensor (Data Link Type) - Test............119
  Sensor Signal (PWM) - Test............131
  Service Tools............141
  Solenoid Valve - Test............145
  Symptom Troubleshooting............152
  Visual Inspection............154
  Wiring Harness (Open Circuit) - Test............156
  Wiring Harness (Short Circuit) - Test............158
UENR4079 - Disassembly & Assembly (D6N Track-Type Tractor Engine Supplement)............160
  Air Cleaner - Remove and Install............162
  Alternator - Remove and Install............166
  Belt Tensioner - Remove and Install............168
  Clean Emissions Module - Remove and Install............170
  Cooling System Package (Radiator, Aftercooler, Oil Cooler) - Remove and Install............172
  Crankshaft Vibration Damper - Remove and Install............176
  DEF Injector and Mounting - Remove and Install............178
  Diesel Exhaust Fluid Filter - Remove and Install 2............180
  Diesel Exhaust Fluid Filter - Remove and Install............182
  Diesel Exhaust Fluid Module - Assemble............186
  Diesel Exhaust Fluid Module - Disassemble............189
  Diesel Exhaust Fluid Module - Remove and Install............193
  Electric Starting Motor - Remove and Install............197
  Electronic Control (Diesel Exhaust Fluid) - Remove and Install............200
  Engine - Remove and Install............202
  Engine Front Support - Remove and Install............208
  Engine Oil Filter and Base - Remove and Install............211
  Engine Side Guards - Remove and Install............213
  Exhaust Cooler (NRS) - Remove and Install............215
  Exhaust Elbow - Remove and Install............217
  Exhaust Gas Valve (NRS) - Remove and Install - Back Pressure Valve............219
  Fan - Remove and Install............223
  Fan Drive - Remove and Install............226
  Fan Guard - Remove and Install............228
  Flexible Exhaust Pipe - Remove and Install............231
  Fumes Disposal Filter - Remove and Install............233
  Hood - Remove and Install............235
  Hydraulic Oil Cooler - Remove and Install............238
  Manifold (DEF Heater) - Remove and Install............241
  Nitrogen Oxide Sensor - Remove and Install............242
  Pressure Sensors (NRS Absolute, NRS Differential) - Remove and Install............244
  Primary Fuel Filter, Water Separator and Base - Remove and Install............248
  Refrigerant Compressor - Remove and Install............250
  Secondary Fuel Filter and Base - Remove and Install............253
  Solenoid Valve (DEF Heater Coolant) - Remove and Install............255
  Soot Antenna - Remove and Install............257
  Soot Sensor - Remove and Install............259
  System Pressure - Release............261
  Temperature Sensor (Cooled Exhaust Gas) - Remove and Install............263
  Temperature Sensor (DPF Inlet, SCR Inlet) - Remove and Install............265
  Turbocharger - Remove and Install............273
  Voltage Control (Load Protection) - Remove and Install............275
  Water Pump (Engine) - Remove and Install............276
  Water Temperature Regulator - Remove and Install............278
UENR4080 - Disassembly & Assembly (D6N Track-Type Tractor Power Train)............281
  Axle - Remove and Install............283
  Bevel and Transfer Gears - Assemble............285
  Bevel and Transfer Gears - Disassemble............298
  Brake Control Valve - Assemble............311
  Brake Control Valve - Disassemble............315
  Brake Control Valve - Remove and Install............320
  Drawbar - Remove and Install............323
  Duo-Cone Conventional Seals - Install ............350
  Equalizer Bar - Remove and Install............364
  Final Drive - Assemble............368
  Final Drive - Disassemble............375
  Final Drive - Remove and Install............382
  Final Drive Planetary Carrier (In Chassis) - Remove and Install............389
  Final Drive, Steering Differential, and Brake (Left Side) - Remove and Install............393
  Final Drive, Steering Planetary, and Brake (Right Side) - Remove and Install............398
  Idler - Remove and Install............401
  Main Drive Shaft - Remove and Install............405
  Oil Filter and Base (Power Train) - Remove and Install............407
  Pivot Shaft - Remove and Install............410
  Power Train Oil Pump - Assemble............414
  Power Train Oil Pump - Disassemble............419
  Power Train Oil Pump - Remove and Install............423
  Recoil Spring - Remove and Install............426
  Relief Valve (Transmission Hydraulic Control) - Assemble............429
  Relief Valve (Transmission Hydraulic Control) - Disassemble............431
  Relief Valve (Transmission Hydraulic Control) - Remove and Install............433
  Sprocket Segment - Remove and Install............435
  Steering Differential and Brake - Assemble............437
  Steering Differential and Brake - Disassemble............461
  Steering Planetary and Brake - Assemble............484
  Steering Planetary and Brake - Disassemble............491
  System Pressure - Release............494
  Torque Converter - Assemble............499
  Torque Converter - Disassemble............508
  Torque Converter - Remove and Install............513
  Torque Converter Outlet Relief Valve - Assemble............518
  Torque Converter Outlet Relief Valve - Disassemble............521
  Torque Converter Outlet Relief Valve - Remove and Install............524
  Track - Connect............527
  Track - Separate............531
  Track Adjuster - Remove and Install............537
  Track Master Link (Clamp) - Remove and Install - SystemOne Track............542
  Track Roller - Remove and Install............546
  Track Roller Frame (Front) - Remove and Install............550
  Track Roller Frame - Remove and Install ............552
  Transmission - Assemble............557
  Transmission - Disassemble............584
  Transmission Hydraulic Control Valve - Assemble............610
  Transmission Hydraulic Control Valve - Disassemble............612
  Transmission Hydraulic Control Valve - Remove and Install............614
  Transmission and Bevel Gears - Remove and Install............618
  Transmission and Bevel Gears - Separate and Connect............624
UENR4081 - Specifications (D6N Track-Type Tractor Systems)............633
  Accumulator (Brake)............638
  Accumulator (Hydraulic) - Charged............639
  Accumulator (Power Train) - Charged............641
  Accumulator - Uncharged............643
  Air Cleaner............644
  Air Conditioner Lines............645
  Air Precleaner (1)............647
  Air Precleaner (2)............649
  Angle Cylinder (Bulldozer)............651
  Bank Valve (Four)............653
  Bank Valve (Three)............655
  Battery and Wiring Group............657
  Bevel and Transfer Gears............660
  Blower Fan............662
  Brake and Planetary............664
  Bulldozer Brace - Arm Group - SU............666
  Bulldozer Trunnion - SU Dozer Only............668
  Bulldozer Trunnion - Super LGP............670
  C-Frame............672
  Cab Air Filter............676
  Cab Door - Forestry-Left-hand side............677
  Cab Door - Forestry-Right-hand side............680
  Cab Door - Left Hand............682
  Cab Door - Right Hand............684
  Case and Frame - Super LGP............686
  Case and Frame............688
  Communication Electronic Control Module (Product Link)............689
  Control Group (Implement)............695
  Control Group (Steering and Transmission)............699
  Control Valve (Bulldozer Angle)............701
  Control Valve (Bulldozer Lift)............703
  Control Valve (Bulldozer Tilt)............705
  Control Valve (Ripper)............707
  Cover (Console)............709
  Cutting Edges and End Bits - LGP Foldable Blade............715
  Cutting Edges and End Bits - SU Dozer............717
  Cutting Edges and End Bits - XL Foldable Blade............719
  Cutting Edges and End Bits............721
  Cylinder Mounting - SU Bulldozer Only............725
  Cylinder Mounting - Super LGP............727
  Differential Drive and Brake Group............729
  Drawbar............733
  Drive Shaft............734
  Electric Starting Motor............735
  Engine Mounting............739
  Equalizer Bar - Super LGP............741
  Equalizer Bar............743
  Ether Starting Aid............745
  Fender - Heavy Duty............746
  Fender............748
  Filter (Steering)............751
  Final Drive............752
  Flood Lamp............754
  Flood Lighting............756
  Fuel Lines............758
  Fuel Tank - Fast Fill - Refueling............759
  Fuel Tank............761
  Gear Pump (Power Train)............763
  High Speed Oil Change Group............768
  Hydraulic Tank and Filter............770
  Idlers (Track) - Front- System One............772
  Idlers (Track) - Heavy Duty............774
  Idlers (Track) - LGP Waste- Heavy Duty............776
  Idlers (Track) - Rear-System One............778
  Joystick Control (Bulldozer)............780
  Lift Cylinder (Bulldozer) - SU Bulldozer Only............782
  Lift Cylinder (Bulldozer) - Super LGP............784
  Lift Cylinder (Bulldozer) - VPAT Bulldozer Only............786
  Limit Switch (Service Brake)............788
  Lines (Diagnostic)............790
  Lines (Steering)............792
  Manifold and Relief Valve (Main)............795
  Oil Filter (Case Drain)............797
  Oil Filter (Power Train)............798
  Piston Motor (Steering)............800
  Piston Pump (Implement)............805
  Piston Pump (Steering)............807
  Pivot Bar - Heavy-Duty Undercarriage............810
  Pivot Bar - Super LGP............812
  Pivot Bar............814
  Position Sensor (Brake)............816
  Position Sensor (Decelerator)............818
  Position Sensor (Steering)............820
  Pressure Switch (Refrigerant)............824
  Pump Lines............825
  Push Arm - Super LGP............827
  Radiator Guard............829
  Recoil Group............831
  Refrigerant Compressor............835
  Refrigerant Condenser............836
  Relief Valve (Main)............838
  Relief Valve (Torque Converter Inlet)............842
  Relief Valve (Torque Converter Outlet)............844
  Ripper Mounting............846
  Ripper............848
  Segmented Sprocket (Drive)............850
  Steering and Brake Control Valve............852
  Striker Bar............853
  Sweep Group............854
  Temperature Sender (Hydraulic Oil)............856
  Tilt Cylinder (Bulldozer) - SU Bulldozer Only............857
  Tilt Cylinder (Bulldozer) - Super LGP............859
  Tilt Cylinder (Bulldozer) - VPAT Bulldozer Only............861
  Toggle Switch (Work Light)............863
  Torque Converter............864
  Track Carrier Roller............868
  Track Guide Guard............870
  Track Idler Cap............876
  Track Roller (Double Flange) - General Duty Roller ............883
  Track Roller (Single Flange) - General Duty Roller ............885
  Track Roller - Double Flange-Heavy Duty............887
  Track Roller - Heavy Duty............889
  Track Roller - System One............891
  Track Roller Frames............893
  Track Roller Guard - Heavy Duty............899
  Track Roller Guard - System one............901
  Track Roller Guard............903
  Tracks - Heavy Duty............905
  Tracks - System One............907
  Transmission Hydraulic Control............908
  Transmission Mounting............910
  Transmission Planetary............912
  Winch Mounting............914
  Window Wiper and Wiper Motor............916
UENR4081 - Systems Operation (D6N Track-Type Tractor Systems)............919
  Accumulator (Pilot)............921
  Accumulator (Power Train)............933
  Additional Electrical Components............935
  Bank Valve (Implement)............938
  Brake System............940
  Differential Steering System............949
  Electronic Control (HVAC System)............960
  Electronic Control (Hydraulic System)............966
  Electronic Control (Power Train System)............972
  Electronic Control (Steering System)............1010
  Equalizer Bar............1016
  Fast Fill Fuel Adapter............1019
  Final Drive............1023
  General Information (HVAC System)............1025
  General Information (Hydraulic System)............1027
  General Information (Power Train System)............1028
  General Information (Steering System)............1030
  General Information (Undercarriage)............1032
  Graphic Color Codes............1034
  HVAC System............1037
  Hydraulic Oil Cooler and Bypass............1041
  Hydraulic Tank and Filter............1044
  Location of Components (HVAC System)............1046
  Location of Components (Hydraulic System)............1052
  Location of Components (Power Train System)............1058
  Location of Components (Steering System)............1060
  Location of Components (Undercarriage)............1066
  Magnetic Screen............1068
  Oil Filter (Power Train)............1071
  Piston Motor (Steering)............1074
  Piston Pump (Implement)............1084
  Pivot Shaft............1096
  Power Train Oil Pump............1098
  Relief Valve (Torque Converter Inlet)............1100
  Relief Valve (Torque Converter Outlet)............1102
  Signal Resolver Network............1106
  Torque Converter (Lockup)............1109
  Track Carrier Roller............1113
  Track Idler............1115
  Track Roller (Double Flange)............1117
  Track Roller (Single Flange)............1119
  Track Roller Frame............1121
  Tracks............1124
  Transfer and Bevel Gears............1128
  Transmission Hydraulic Control............1130
  Transmission Lubrication............1141
  Transmission............1150
  techdoc_print_page............1161
UENR4081 - Testing & Adjusting (D6N Track-Type Tractor Systems)............1171
  Accumulator (Pilot) - Test and Charge............1172
  Accumulator (Power Train) - Test and Charge............1184
  Brake Pressure - Test............1187
  Calibration Error Codes............1195
  Calibration............1210
  Case Pressure (Steering Pump) - Check............1225
  Machine Preparation............1236
  Neutral Adjustment (Steering Pump) - Test and Adjust............1241
  Operational Checks (Hydraulic System)............1252
  Piston Pump (Implement) - Test and Adjust............1257
  Relief Valve (Charge) - Test and Adjust............1269
  Relief Valve (Torque Converter Inlet) Pressure - Test and Adjust............1276
  Relief Valve (Torque Converter Outlet) Pressure - Test and Adjust............1282
  Relief Valve (Transmission) - Test and Adjust............1288
  Resolver Network - Test............1294
  Sprocket Speed (Final Drive) - Check............1296
  Stable Blade Sensor - Test............1300
  Steering Hydraulic Circuit - Test and Adjust............1308
  Torque Converter Lockup Clutch Pressure - Test............1313
  Transmission Clutch Pressure - Test............1319
  Transmission Lubrication Oil Pressure - Test............1324
UENR4082 - Disassembly & Assembly (D6N Track-Type Tractor Machine Systems)............1327
  Accumulator (Implement) - Remove and Install............1329
  Air Conditioner Dryer - Remove and Install............1331
  Bottom Guard - Remove and Install............1335
  Bulldozer (VPAT) - Remove and Install............1348
  Bulldozer Angle Cylinder (VPAT) - Remove and Install............1352
  Bulldozer C-Frame (VPAT) - Remove and Install............1356
  Bulldozer Lift Cylinder (VPAT) - Remove and Install............1361
  Bulldozer Tilt Cylinder (VPAT) - Remove and Install............1365
  Cab - Remove and Install............1369
  Control (Joystick) - Remove and Install............1382
  Decelerator and Brake Control - Remove and Install............1386
  Fuel Tank - Remove and Install............1388
  Hydraulic Control Valve - Assemble............1393
  Hydraulic Control Valve - Disassemble............1416
  Hydraulic Control Valve - Remove and Install............1420
  Hydraulic Tank - Remove and Install............1424
  Piston Pump (Implement) - Assemble............1427
  Piston Pump (Implement) - Disassemble............1438
  Piston Pump (Implement) - Remove and Install............1449
  Piston Pump (Steering) - Assemble............1452
  Piston Pump (Steering) - Disassemble............1472
  Piston Pump (Steering) - Remove and Install............1492
  Refrigerant Accumulator - Remove and Install............1494
  Refrigerant Condenser - Remove and Install............1498
  Refrigerant Condenser Fan and Fan Motor - Remove and Install............1502
  Refrigerant Evaporator Core and Heater Core - Remove and Install............1506
  Rollover Protective Structure (ROPS) - Remove and Install............1512
  Seat - Remove and Install............1515
  Steering Motor - Assemble............1518
  Steering Motor - Disassemble............1531
  Steering Motor - Remove and Install............1535
  Steering Sensor - Assemble............1539
  Steering Sensor - Disassemble............1544
  Steering and Transmission Control - Remove and Install............1549
  System Pressure - Release............1562
UENR4083 - Schematic (D6N Track-Type Tractor Power Train System)............1566
  Collage............1567
  Main............1580
    Features............1580
    Cover Page............1581
    Information............0
      Component Location............1582
      Tap Location............1583
      Fluid Power Symbols............1584
      Electrical Symbols............1585
    Schematic............1586
    Machine Views............0
      Machine View............1587
      Right Side Compartment View............1588
UENR5402 - Schematic (D6N Track-Type Tractor Electrical System)............1589
  Collage............1590
  Main............1635
    Feature............1635
    Cover Page............1637
    Information............0
      Component Location............0
        Volume 1 of 2 - Machine Wiring............0
          Page 1 of 2............1638
          Page 2 of 2............1639
        Volume 2 of 2 - Accugrade and Attachment Wiring............1640
      Connector Location............0
        Volume 1 of 2 - Machine Wiring............1641
        Volume 2 of 2 - Accugrade and Attachment Wiring............1642
      Specifications and Related Manuals............0
        Volume 1 of 2 - Machine Wiring............1643
        Volume 2 of 2 - Accugrade and Attachment Wiring............1644
    Schematics............0
      Volume 1 of 2 - Machine Wiring............1645
      Volume 2 of 2 - Accugrade and Attachment Wiring............1646
    Machine Views............0
      Volume 1 of 2 - Machine Wiring............0
        Blade Sensor Wiring............1647
        Cab Wiring (HVAC)............1648
        Dash Wiring............1649
        Engine Wiring (Left Side View)............1650
        Engine Wiring (Right Side View)............1651
        Headliner Wiring............1652
        LH console Wiring............1653
        LH Fender Wiring............1654
        RH Console Wiring............1655
        RH rear Chassis Wiring............1656
        Transmission Wiring............1657
      Volume 2 of 2 - Accugrade and Attachment Wiring............0
        Headliner View............1658
        LH Chassis View............1659
        LH Fender View............1660
        RH Rear Chassis View............1661
UENR5403 - Schematic (D6N Track-Type Tractor Hydraulic System)............1662
  Main............1663
    Features............1663
    Cover page............1665
    Tables............0
      Components............1666
      Taps............1667
    Schematic............1668
    Machine Views............0
      Under Cab............1669
      Ripper............1670
      Remote Tap Panel............1671
      Front Frame............1672
UENR5491 - Troubleshooting (D6N Track-Type Tractor Electrohydraulic System)............1673
  Backup Alarm Does Not Function............1676
  Brake Does Not Engage............1679
  Brake Does Not Release............1681
  CAN Data Link - Test............1686
  Connector Contact Description............1701
  Connector Locations............1712
  Determining Diagnostic Trouble Codes............1713
  Diagnostic Capabilities............1724
  Diagnostic Trouble Codes............1729
  ECM - Configure............1744
  ECM - Replace............1746
  ECM Location Code - Test............1748
  ECM Software - Install............1763
  Electrical Connector - Inspect............1765
  Electrical Power Supply - Test............1772
  Emerging Symptom Information............1779
  Event Codes............1780
  Fuel Tank Overfills (Fast Fill Fuel)............1791
  Fuel Tank Underfills (Fast Fill Fuel)............1793
  Fueling Nozzle Leaks (Fast Fill Fuel)............1795
  Fueling Nozzle Shuts Off Prematurely (Fast Fill Fuel)............1796
  General Information............1798
  HVAC, Air Conditioning System............1800
  HVAC, Automatic Temperature Control System............1817
  HVAC, Condensate Drainage System............1834
  HVAC, Control System............1835
  HVAC, General Troubleshooting............1843
  HVAC, Heating System............1846
  HVAC, Required Tools............1854
  HVAC, Visual Inspection............1857
  Hydraulic Cylinder Movement Is Harsh............1859
  Hydraulic System Has Unusual Noise............1861
  Hydraulic System Oil Contains Air............1863
  Hydraulic System Oil Level Is Low............1865
  Hydraulic System Oil Temperature Is High............1867
  Hydraulic System............1872
  Implement Cycle Time Is Fast............1879
  Implement Cycle Time Is Slow............1887
  Implement System - Troubleshooting for the Implement Hydraulic System............1890
  Machine Does Not Move............1898
  Machine Movement Jerks While Operating............1902
  Machine Preparation for Troubleshooting............1906
  Operator Control Switch (Switch to Ground) - Test............1911
  Parameter - Test............1921
  Power Train Oil Contains Air............1931
  Power Train Oil Temperature Is High............1934
  Power Train Oil............1938
  Power Train System Pressure Is Low............1943
  Relay - Test............1945
  Ripper Does Not Function............1953
  Sensor (Data Link Type) - Test............1955
  Sensor Signal (Analog, Active) - Test............1963
  Sensor Signal (Analog, Passive) - Test............1969
  Sensor Signal (PWM) - Test............1975
  Sensor Supply - Test............1995
  Service Tools............2004
  Solenoid Valve (Switch Controlled) - Test............2007
  Solenoid Valve - Test............2020
  Speed Sensor (Dual Signal) - Test............2029
  Speed Sensor - Test............2036
  Steering Does Not Function in One Direction............2049
  Steering Does Not Function............2051
  Steering Hesitates............2058
  Steering Is Harsh............2061
  Steering Is Unstable............2065
  Steering Turn Force Is Low............2067
  Steering Turn Radius Is Large............2069
  Symptom Troubleshooting............2075
  System Schematic............2077
  Transmission Does Not Shift Into All Gears............2088
  Wiring Harness (Open Circuit) - Test............2100
  Wiring Harness (Short Circuit) - Test............2107
UENR5957 - Systems Operation (D6N & D6K2 Track-Type Tractor Monitoring System)............2109
  Data Link............2110
  Diagnostic Operation............2112
  Display Menu............2114
  Display Module............2118
  General Information............2121
  Machine Menu............2123
  Menu Navigation............2126
  Menus............2129
  Monitoring System............2132
  Operator Menu............2135
  Output Components............2138
  Pop-Up Messages............2139
  Service Menu............2144
  Totals Menu............2147
  Warning Operation............2150
UENR5957 - Testing & Adjusting (D6N & D6K2 Track-Type Tractor Monitoring System)............2152
  Connector Contact Description............2153
  Electrical Connector - Inspect............2156
  Module - Flash Program............2160
  Module - Replace............2162
  System Schematic............2164
  Wiring Harness (Open Circuit) - Test............2166
  Wiring Harness (Short Circuit) - Test............2168
UENR5957 - Troubleshooting (D6N & D6K2 Track-Type Tractor Monitoring System)............2170
  CAN Data Link - Test............2171
  Data Link Configuration Status - Test............2177
  Determining Diagnostic Trouble Codes............2182
  Diagnostic Trouble Codes............2185
  Display Is Blank............2187
  Electrical Power Supply - Test............2190
  Emerging Symptom Information............2194
  Service Tools............2196
  Symptom Troubleshooting............2201
UENR7902 - Schematic (D6N Track-Type Tractor Electrical System)............2203
  Main............2204

EXCERPT:
84. Position transmission hydraulic control valves (1C).
85. Install bolts (1B). Tighten bolts (1B) to a torque of 30 ± 4 N·m (22 ± 3 lb ft).
86. Connect harness assemblies (1A).
87. Install tubes (1) and (2). Tighten tubes (1) and (2) to a torque of 35 ± 7.5 N·m (26 ± 6 lb ft)
End By: a. Connect the transmission and bevel gear.
...

Caterpillar D6N Track-Type Tractors Factory Service & Shop Manual