Complete workshop repair service manual with electrical wiring diagrams for Caterpillar D6K2 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 D6K2 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.

UENR0067 - Disassembly & Assembly (D6K2 Track-Type Tractor Power Train)
UENR0069 - Schematic (D6K2 Track-Type Tractor Hydraulic System)
UENR0070 - Specifications (D6K2 Track-Type Tractor Systems)
UENR0070 - Systems Operation (D6K2 Track-Type Tractor Systems)
UENR0070 - Testing & Adjusting (D6K2 Track-Type Tractor Systems)
UENR0071 - Disassembly & Assembly (D6K2 Track-Type Tractor Machine Systems)
UENR1398 - Disassembly & Assembly (D6K2 Track-Type Tractor Engine Supplement)
UENR1399 - Schematic (D6K2 Track-Type Tractor Electrical System)
UENR1730 - Systems Operation (D6K2 Track-Type Tractor Monitoring System)
UENR1730 - Testing & Adjusting (D6K2 Track-Type Tractor Monitoring System)
UENR1731 - Troubleshooting (D6K2 Track-Type Tractor Electrohydraulic System)
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UENR0067 - Disassembly & Assembly (D6K2 Track-Type Tractor Power Train).......2
  Control Manifold (Steering and Brake).......3
  Duo-Cone Conventional Seals.......6
  Equalizer Bar.......19
  Final Drive and Parking Brake.......26
  Piston Motor (Hydrostatic).......55
  Piston Pump (Hydrostatic).......80
  Pivot Shaft.......156
  Pump Coupling.......160
  Recoil Spring.......164
  Sprocket Segment.......178
  System Pressure - Release.......180
  Track Adjuster.......182
  Track Brake.......185
  Track Carrier Roller (SystemOne).......193
  Track Carrier Roller.......196
  Track Guide Guard.......199
  Track Idler.......200
  Track Links.......211
  Track Roller Frame.......215
  Track Roller Guard.......222
  Track Roller.......223
  Track.......231
UENR0069 - Schematic (D6K2 Track-Type Tractor Hydraulic System).......235
  Collage.......236
  Main.......248
    Features.......248
    Cover Page.......249
    Information.......0
      Component Location.......0
        Page 1 of 2.......250
        Page 2 of 2.......251
      Tap Location.......252
      Fluid Power Symbols.......253
      Electrical Symbols.......254
    Schematic.......255
    Machine Views.......0
      Additional Chassis View.......256
      Chassis View.......257
      Implement Valve.......258
      Rear Compartment on Left Fender.......259
      Right Fender Compartment.......260
      Winch and Ripper.......261
      Winch Pump.......262
UENR0070 - Specifications (D6K2 Track-Type Tractor Systems).......263
  Accumulator (Hydraulic) - Charged.......266
  Air Cleaner.......267
  Air Conditioner Lines.......269
  Air Conditioner.......271
  Angle Cylinder (Bulldozer).......274
  Angle and Tilt Lines.......276
  Angling Blade.......278
  Bank Valve (Four).......286
  Control Manifold (Automatic Reversing Fan).......295
  Control Manifold (Hydraulic Fan).......297
  Counterweight.......299
  Cover (Cab).......301
  Cover (Console).......303
  Cutting Edges and End Bits.......306
  Drawbar.......310
  Equalizer Bar.......312
  Fan and Motor.......314
  Final Drive and Parking Brake.......316
  Fuel Tank.......324
  Gear Motor (Hydraulic Fan).......326
  Gear Pump (Hydraulic Fan).......328
  Grade Control.......329
  Handle Control (Ripper).......330
  Hydraulic Fan Drive Lines.......331
  Hydraulic Tank and Mounting.......332
  Hydraulic Tank.......334
  Joystick Control (Bulldozer).......336
  Lift Cylinder (Bulldozer).......338
  Lift Cylinder (Ripper).......340
  Lines (Charge Pressure).......344
  Muffler.......346
  Oil Cooler Core (Power Train).......348
  Operator Console.......350
  Pilot Lines.......351
  Piston Motor (Hydrostatic).......352
  Piston Motor (Winch).......355
  Piston Pump (Hydrostatic).......356
  Piston Pump (Implement).......360
  Piston Pump (Winch).......362
  Pivot Bar.......365
  Power Angling Frame - Cylinder Pin.......369
  Power Angling Frame.......370
  Pump Coupling.......372
  Pump and Lines (Implement, Hydraulic Fan).......374
  Recoil Spring.......376
  Refrigerant Compressor.......378
  Refrigerant Condenser.......380
  Ripper Mounting.......381
  Ripper.......383
  Sprocket Segment.......385
  Suspension Seat.......388
  Sweep Group.......390
  Tilt Cylinder (Bulldozer).......394
  Track Carrier Roller (SystemOne).......396
  Track Carrier Roller - Heavy-Duty.......398
  Track Guide Guard.......400
  Track Idler - Heavy-Duty.......401
  Track Idler - System One.......403
  Track Links - Heavy-Duty.......405
  Track Links - System One.......407
  Track Roller - Double Flange Heavy-Duty.......409
  Track Roller - Single Flange Heavy-Duty.......412
  Track Roller - Single Flange, System One.......415
  Track Roller Frame - Heavy Duty.......418
  Track Roller Frame - System One.......426
  Track Roller Frame Guard.......430
  Track Roller Guard - Heavy Duty.......431
  Track Roller Guard - Heavy-Duty.......432
  Track Roller Guard - System One.......433
  Water Lines.......434
  Winch Fairlead.......436
  Window Wiper Motor.......438
  Window Wiper and Wiper Motor.......442
UENR0070 - Systems Operation (D6K2 Track-Type Tractor Systems).......446
  Additional Electrical Components.......448
  Brake System.......453
  Bulldozer Angle Hydraulic System.......466
  Bulldozer Lift Hydraulic System.......473
  Bulldozer Tilt Hydraulic System.......488
  Electronic Control (HVAC System).......494
  Electronic Control (Hydraulic System).......508
  Electronic Control (Power Train System).......528
  Electronic Control (Winch System).......549
  Fan Hydraulic System.......564
  Final Drive.......570
  Flushing Valve.......574
  General Information (HVAC System).......577
  General Information (Hydraulic System).......580
  General Information (Power Train System).......583
  General Information (Undercarriage).......586
  General Information (Winch System).......588
  HVAC System.......591
  Hydraulic Block.......595
  Line Relief and Makeup Valve.......598
  Location of Components (HVAC System).......601
  Location of Components (Hydraulic System).......609
  Location of Components (Power Train System).......622
  Location of Components (Undercarriage).......636
  Location of Components (Winch System).......640
  Motor Control Valve (Hydrostatic) (Displacement).......644
  Oil Filter (Hydraulic).......650
  Piston Motor (Hydrostatic).......652
  Piston Pump (Hydrostatic).......655
  Piston Pump (Implement).......661
  Piston Pump (Winch).......669
  Power Train System.......672
  Proportional Priority Pressure Compensation System.......702
  Relief Valve (Charge Pressure) (Winch).......704
  Relief Valve (Charge Pressure).......707
  Relief Valve (Crossover) (Winch).......709
  Relief Valve (Crossover).......712
  Relief Valve (Pressure Override) - Winch.......716
  Ripper_Fourth Function Hydraulic System.......718
  Solenoid Valve (Pilot On_Off).......725
  Track Carrier Roller.......727
  Track Roller (Double Flange).......728
  Track Roller (Single Flange).......730
  Track Roller (Single Flange, SystemOne).......732
  Winch Operation.......734
UENR0070 - Testing & Adjusting (D6K2 Track-Type Tractor Systems).......738
  Accumulator (Pilot) - Test and Charge.......739
  Calibration.......745
  Charge Relief Valve (Winch) - Test and Adjust.......759
  Charge Relief Valve - Test and Adjust.......766
  Configuration Parameters.......774
  Crossover Relief Valve (Winch) - Test and Adjust.......779
  Crossover Relief Valve - Test and Adjust - Hydrostatic Stall.......790
  Deceleration_Brake Pedal - Test.......799
  Fan Speed - Calibrate.......805
  Filling and Flushing the Hydrostatic System.......810
  Final Hydrostatic Speed - Test.......819
  Hydraulic Pump - Test and Adjust.......827
  Machine Preparation.......835
  Operational Checks.......840
  Piston Pump Neutral (Winch) - Test and Adjust.......844
  Piston Pump Neutral - Test and Adjust.......853
  Piston Pump and Motor Maximum Displacement - Test.......864
  Pressure Override Valve (Winch) - Test and Adjust.......870
  Proportional Priority Pressure Compensation System - Test.......877
  Relief Valve (Line) - Test and Adjust.......882
  Steering - Test.......887
UENR0071 - Disassembly & Assembly (D6K2 Track-Type Tractor Machine Systems).......895
  Accumulator (Hydraulic).......897
  Air Conditioner Lines.......898
  Air Conditioner.......900
  Angle Cylinder (Bulldozer).......914
  Angle and Tilt Lines.......920
  Angling Blade.......922
  Bank Valve (Four).......934
  Bank Valve (Three).......985
  Bottom Guard.......1026
  Cab.......1030
  Communication Electronic Control Module (Product Link).......1038
  Control Manifold (Automatic Reversing Fan).......1040
  Control Manifold (Hydraulic Fan).......1051
  Cutting Edges and End Bits.......1055
  Decelerator and Brake Control.......1057
  Disconnecting Snap To Connect Fittings.......1068
  Drawbar.......1072
  Electronic Control Module (Machine).......1074
  Electronic Control Module (Ripper System).......1075
  Fan - Refrigerant Condenser.......1076
  Fuel Tank.......1078
  Gear Motor (Hydraulic Fan).......1083
  Gear Pump (Hydraulic Fan).......1090
  Handle Control (Ripper).......1097
  Heater Lines.......1098
  Hydraulic Fan Drive Lines.......1099
  Hydraulic Tank.......1101
  Joystick Control (Bulldozer).......1111
  Joystick Control (Steering and Transmission).......1115
  Lift Cylinder (Bulldozer).......1117
  Lift Cylinder (Ripper).......1123
  Oil Filter (Hydraulic).......1130
  Piston Motor (Winch).......1132
  Piston Pump (Implement).......1133
  Piston Pump (Winch).......1157
  Pitch Link.......1199
  Power Angling Frame.......1201
  Refrigerant Accumulator.......1207
  Refrigerant Condenser.......1210
  Ripper Carriage (Beam).......1214
  Ripper Control Linkage.......1217
  Ripper Frame.......1220
  Ripper Mounting.......1224
  Ripper.......1226
  Seat.......1228
  Suspension Seat.......1231
  Sweep Group.......1234
  System Pressure - Release.......1236
  Tilt Cylinder (Bulldozer).......1238
  Winch.......1244
  Window Wiper and Wiper Motor (Door).......1247
  Window Wiper and Wiper Motor (Front, Rear).......1249
UENR1398 - Disassembly & Assembly (D6K2 Track-Type Tractor Engine Supplement).......1257
  Air Cleaner - Remove and Install.......1258
  Alternator - Remove and Install.......1260
  Belt Tensioner - Remove and Install.......1263
  Cooling System Package (Radiator, Aftercooler, Hydraulic Oil Cooler) - Remove and Install.......1265
  Crankshaft Front Seal - Remove and Install.......1271
  Crankshaft Vibration Damper and Pulley - Remove and Install.......1275
  Disconnecting Snap To Connect Fittings.......1277
  Electric Starting Motor - Remove and Install.......1281
  Engine - Remove and Install.......1282
  Engine Enclosure - Remove and Install.......1293
  Engine Front Support - Remove and Install.......1296
  Engine Oil Filter and Base - Remove and Install.......1298
  Fan - Remove and Install.......1301
  Hood - Remove and Install.......1303
  Muffler - Remove and Install.......1306
  Oil Cooler (Engine) - Remove and Install.......1308
  Primary Fuel Filter, Water Separator and Base - Remove and Install.......1311
  Radiator Tank - Remove and Install.......1314
  Refrigerant Compressor - Remove and Install.......1316
  Secondary Fuel Filter and Base - Remove and Install.......1319
  System Pressure - Release.......1321
  Turbocharger - Remove and Install.......1323
  Water Pump - Remove and Install.......1325
  Water Temperature Regulator - Remove and Install.......1331
UENR1399 - Schematic (D6K2 Track-Type Tractor Electrical System).......1333
  Collage.......1334
  Main.......1408
    Features.......1408
    Cover page.......1410
    Tables.......0
      Components.......0
        Engine and Chassis.......1411
        Cab and Accugrade®.......1412
      Connector.......0
        Engine and Chassis.......1413
        Cab and Accugrade®.......1414
      Related Manuals.......0
        Engine and Chassis.......1415
        Cab and Accugrade®.......1416
    Schematic.......0
      Engine and Chassis.......1417
      Cab and Accugrade®.......1418
    Machine Views.......0
      Engine and Chassis.......0
        Radiator Wiring.......1419
        Power Train Wiring.......1420
        Filter Wiring.......1421
        Engine Wiring - Right View.......1422
        Engine Wiring - Left View.......1423
        Chassis and Implement Wiring.......1424
        Stable Blade Control Wiring.......1425
      Cab and Accugrade®.......0
        RH Console Wiring.......1426
        Operator Control Pod Wiring.......1427
        Left Console - Left Side View.......1428
        Front Cab Wiper Wiring.......1429
        Cab Headliner Wiring.......1430
        Cab Dash Wiring.......1431
        Accugrade® and Product Link Wiring .......1432
UENR1730 - Systems Operation (D6K2 Track-Type Tractor Monitoring System).......1433
  Data Link.......1434
  Display Module.......1436
  General Information.......1446
  Menu Navigation.......1447
  Menus (Compact Instrument Cluster).......1455
  Monitoring System.......1476
  Output Components.......1478
  Warning Operation.......1479
UENR1730 - Testing & Adjusting (D6K2 Track-Type Tractor Monitoring System).......1482
  Connector Contact Description.......1483
  Electrical Connector - Inspect.......1485
  Module - Replace.......1493
  Self Test.......1495
  System Schematic.......1496
  Wiring Harness (Open Circuit) - Test.......1498
  Wiring Harness (Short Circuit) - Test.......1499
UENR1731 - Troubleshooting (D6K2 Track-Type Tractor Electrohydraulic System).......1500
  CAN Data Link - Test.......1502
  Cat Data Link - Test.......1512
  Connector Contact Description.......1516
  Connector Locations.......1526
  Determining Diagnostic Trouble Codes.......1531
  Diagnostic Capabilities.......1535
  Diagnostic Trouble Codes.......1539
  ECM - Configure.......1551
  ECM - Replace.......1553
  ECM Location Code - Test.......1555
  ECM Software - Install.......1559
  Electrical Connector - Inspect.......1560
  Electrical Power Supply - Test.......1567
  Emerging Symptom Information.......1571
  Event Codes.......1572
  Fast Fill Fuel System.......1578
  General Information.......1581
  Hydraulic Fan System.......1583
  Implement System - D6K2.......1587
  Machine Preparation for Troubleshooting.......1592
  Operator Control Switch (Switch to Battery) - Test.......1597
  Operator Control Switch (Switch to Ground) - Test.......1600
  Power Train Oil - D6K2.......1612
  Relay - Test.......1626
  Sensor Signal (Analog, Active) - Test.......1631
  Sensor Signal (Analog, Passive) - Test.......1637
  Sensor Signal (PWM) - Test.......1644
  Sensor Supply - Test.......1658
  Service Tools.......1663
  Solenoid Return - Test.......1665
  Solenoid Valve - Test.......1670
  Speed Sensor - Test.......1685
  Symptom Troubleshooting.......1691
  System Schematic.......1693
  Wiring Harness (Open Circuit) - Test.......1701
  Wiring Harness (Short Circuit) - Test.......1702

EXCERPT:
ECM (56) sends the following signals to proportional solenoid valve (20) of piston pump (12) .
A signal with a solenoid duty cycle of less than initialization current is sent to the reverse solenoid of proportional solenoid valve (20) .
A signal with a solenoid duty cycle of less than initialization current is sent to the forward solenoid of the proportional solenoid valve (20) .
As a result of the signals to the solenoids of the piston motors, the piston motors remain at the maximum displacements. As a result of the signals to the solenoids of piston pump (12), pilot oil in line (44) flows to proportional solenoid valve (20). The oil flows through the proportional solenoid valve (20) to passage (43) to the pump case drain. Since the pressure in passage (45) is equal to the pressure in passage (50), the springs on each side of actuator piston (18) centers actuator piston (18) and the swashplate for piston pump (12) remains at zero angle. As a result of the signals to the solenoids of piston pump (17), pilot oil in line (47) flows to proportional solenoid valve (21). The oil flows through proportional solenoid valve (21) to passage (49) to the pump case drain. Since the pressure in passage (48) is equal to the pressure in passage (46), the springs on each side of actuator piston (19) centers actuator piston (19) and the swashplate for piston pump (17) remains at zero angle. Since the piston pumps are at zero angle, both loops of the hydrostatic system are in a hydraulic lock and the machine does not move.
The ECM (56) receives feedback from speed sensors (4) and (55) on track speed, and sensors (73), (74), (75), and (76) .
Forward Travel
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Caterpillar D6K2 Track-Type Tractors Factory Service & Shop Manual