Complete Diagnosis & Tests Technical Manual with electrical wiring diagrams for John Deere 748H Skidder (S.N. 630436- ), with workshop information to maintain, diagnose, and rebuild like professional mechanics.

John Deere 748H Skidder (S.N. 630436- ) workshop Diagnosis & Tests technical manual includes:
* Numbered table of contents easy to use so that you can find the information you need fast.
* Detailed sub-steps expand on repair procedure information
* Numbered instructions guide you through every repair procedure step by step.
* Troubleshooting and electrical service procedures are combined with detailed wiring diagrams for ease of use.
* Notes, cautions and warnings throughout each chapter pinpoint critical information.
* Bold figure number help you quickly match illustrations with instructions.
* Detailed illustrations, drawings and photos guide you through every procedure.
* Enlarged inset helps you identify and examine parts in detail.

TM11797 - John Deere 748H Skidder (S.N. 630436- ) Technical Manual - Diagnosis and Test.pdf
tm11807 - John Deere Remolcador de troncos 748H (630436— ).pdf
tm11802 - John Deere Débusqueurs 748H (630436— ).pdf
tm12068 - John Deere скиддера 748H (630436— ).pdf

PRODUCT DETAILS:
Total Pages: 1,553 pages
File Format: PDF (bookmarked, ToC, Searchable, Printable)
Category: Operation and Test
Language: English Spanish French Russian
Published on 2018/09/13

MAIN SECTIONS
   Foreword
   Technical Information Feedback Form
   General Information
      Safety
   Diagnostic Trouble Codes (DTC)
      Engine Control Unit (ECU) Diagnostic Trouble Codes
      Transmission Control Unit (TCU) Diagnostic Trouble Codes
      Standard Display Monitor (SDM) Diagnostic Trouble Codes
      Flex Load Controller (FLC) Diagnostic Trouble Codes
      Sealed Switch Module (SSM) Diagnostic Trouble Codes
      Bump Shift Controller (BSC) Diagnostic Trouble Codes
   Operational Checkout Procedure
      Operational Checkout Procedure
   Engine
      Theory of Operation
      Diagnostic Information
      Tests
   Electrical System
      System Information
      System Diagrams
      Sub-System Diagnostics
      Monitor Operation
      References
   Power Train
      Theory of Operation
      Diagnostic Information
      Adjustments
      Tests
   Hydraulic System
      Theory of Operation
      Diagnostic Information
      Adjustments
      Tests
   Winch
      Theory of Operation
      Diagnostic Information
      Adjustments
      Test
   Heating and Air Conditoning
      Theory Of Operation
      Diagnostic Information
      Test

TABLE OF CONTENTS
Section 9000: General Information...23
  Group 01: Safety...23
    Recognize Safety Information...26
    Follow Safety Instructions...27
    Operate Only If Qualified...28
    Wear Protective Equipment...29
    Avoid Unauthorized Machine Modifications...30
    Inspect Machine...31
    Stay Clear of Moving Parts...32
    Avoid High-Pressure Fluids...33
    Avoid High-Pressure Oils...34
    Do Not Use Starting Fluid...35
    Work In Ventilated Area...36
    Prevent Fires...37
    Prevent Battery Explosions...38
    Handle Chemical Products Safely...39
    Decommissioning — Proper Recycling and Disposal of Fluids and Components...40
    Prepare for Emergencies...41
    Clean Debris from Machine...42
    Use Steps and Handholds Correctly...43
    Start Only From Operator's Seat...44
    Use and Maintain Seat Belt...45
    Prevent Unintended Machine Movement...46
    Avoid Work Site Hazards...48
    Operate Machine Safely...49
    Keep Riders Off Machine...50
    Avoid Backover Accidents...51
    Avoid Machine Tip Over...52
    Operating on Slopes...54
    Operating or Traveling On Public Roads...55
    Inspect and Maintain ROPS...56
    Keep the Operator Protective Structure (OPS) in Place...57
    Add and Operate Attachments Safely...58
    Park and Prepare for Service Safely...59
    Service Tires Safely...61
    Service Cooling System Safely...62
    Service Accumulator Systems Safely...63
    Remove Paint Before Welding or Heating...64
    Make Welding Repairs Safely...65
    Drive Metal Pins Safely...66
Section 9001: Diagnostic Trouble Codes (DTC)...67
  Group 10: Engine Control Unit (ECU) Diagnostic Trouble Codes...76
    Engine Control Unit (ECU) Diagnostic Trouble Codes...76
    000091.09 - CAN Throttle Message Missing or Late...67
    000190.00 - Engine Overspeed Extreme...67
    000190.16 - Engine Overspeed Moderate...67
    000676.03 - Glow Plug Relay Out of Range High...67
    000676.05 - Glow Plug Relay Out of Range Low...67
    001075.05 - Low Pressure Fuel Pump Out of Range Low...67
    001075.06 - Low Pressure Fuel Pump Out of Range High...67
    002003.09 - TCU Communication Data Error...67
    002003.13 - TCU Communication Calibrate Error...67
    002017.09 - SDM Communication Data Error...67
    002017.13 - SDM Communication Calibrate Error...67
  Group 20: Transmission Control Unit (TCU) Diagnostic Trouble Codes...103
    Transmission Control Unit (TCU) Diagnostic Trouble Codes...103
    000158.03 - Switched Power Out of Range High...67
    000161.02 - Transmission Input Speed Sensor Erratic or Bad Data...67
    000177.00 - Transmission Oil Temperature High...67
    000177.03 - Transmission Oil Temperature Sensor Out of Range High...67
    000177.04 - Transmission Oil Temperature Sensor Out of Range Low...67
    000191.02 - Transmission Output Speed Data Invalid...67
    000525.02 - Shift Parameter Erratic or Bad Data...67
    000774.04 - Bump Up Shift Switch Short to Ground...67
    000775.04 - Bump Down Shift Switch Short to Ground...67
    000777.03 - Lockup Clutch Out of Range High...67
    000777.05 - Lockup Clutch Out of Range Low...67
    003509.04 - Sensor Supply #1 Out of Range Low...67
    003510.04 - Sensor Supply #2 Out of Range Low...67
    003511.04 - Sensor Supply #3 Out of Range Low...67
    003512.04 - Sensor Supply #4 Out of Range Low...67
    522002.31 - Upshift and Downshift Inputs Active...67
    522003.31 - Neutral, Forward, and Reverse Inputs Passive...67
    522004.04 - Park and Not Park Active Out of Range Low...68
    522005.03 - Park and Not Park Active Out of Range High...68
    522151.31 - Shifter Neutral and Forward Inputs Active...68
    522153.31 - Shifter Neutral and Reverse Inputs Active...68
    522169.04 - Gear Enable/Differential Lock Switch Out of Range...68
    522252.00 - Clutch #1 Hold Value Out of Range High...68
    522252.01 - Clutch #1 Hold Value Out of Range Low...68
    522253.00 - Clutch #2 Hold Value Out of Range High...68
    522253.01 - Clutch #2 Hold Value Out of Range Low...68
    522254.00 - Clutch #3 Hold Value Out of Range High...68
    522254.01 - Clutch #3 Hold Value Out of Range Low...68
    522255.00 - Clutch #4 Hold Value Out of Range High...68
    522255.01 - Clutch #4 Hold Value Out of Range Low...68
    522256.00 - Clutch A Hold Value Out of Range High...68
    522256.01 - Clutch A Hold Value Out of Range Low...68
    522257.00 - Clutch B Hold Value Out of Range High...68
    522257.01 - Clutch B Hold Value Out of Range Low...68
    522258.00 - Clutch C Hold Value Out of Range High...68
    522258.01 - Clutch C Hold Value Out of Range Low...68
    522259.00 - Clutch D Hold Value Out of Range High...68
    522259.01 - Clutch D Hold Value Out of Range Low...68
    522284.02 - Transmission Cylinder Speed Data Invalid...68
    522398.12 - Not Park and Park Pressure Inputs Active...68
    522414.03 - Clutch D Out of Range High...68
    522414.05 - Clutch D Out of Range Low...68
    522507.14 - Calibrate While Inching...68
    523655.03 - Forward and Reverse Inputs Active...68
    523689.04 - Differential Lock Short to Ground...68
    523697.04 - Inching Pedal Top of Clutch Switch Short to Ground...68
    523967.09 - Top of Clutch Input Passive Abnormal Data Rate...68
    523699.31 - Speed Clutch Slippage...68
    523700.16 - Inching Pedal Limit Exceeded...68
    523700.31 - Directional Clutch Slippage...68
    523708.02 - Inching Pedal Switch Module Data Invalid...69
    523708.04 - Inching Pedal Bottom of Clutch Switch Short to Ground...69
    523712.31 - Park Brake Not Set During Calibration...69
    523717.31 - Holding Clutch Unexpected Response...69
    523718.31 - Cylinder Speed Invalid During Calibration...69
    523720.00 - Clutch D Fill Out of Range High...69
    523720.01 - Clutch D Fill Out of Range Low...69
    523721.00 - Clutch C Fill Out of Range High...69
    523721.01 - Clutch C Fill Out of Range Low...69
    523722.00 - Clutch B Fill Out of Range High...69
    523722.01 - Clutch B Fill Out of Range Low...69
    523723.00 - Clutch A Fill Out of Range High...69
    523723.00 - Clutch A Fill Out of Range Low...69
    523724.00 - Clutch 4 Fill Out of Range High...69
    523724.01 - Clutch 4 Fill Out of Range Low...69
    523725.00 - Clutch 3 Fill Out of Range High...69
    523725.01 - Clutch 3 Fill Out of Range Low...69
    523726.00 - Clutch 2 Fill Out of Range High...69
    523726.01 - Clutch 2 Fill Out of Range Low...69
    523727.00 - Clutch 1 Fill Out of Range High...69
    523727.01 - Clutch 1 Fill Out of Range Low...69
    523728.31 - Unexpected Cylinder Speed REV Calibration...69
    523729.31 - Unexpected Cylinder Speed FWD Calibration...69
    523730.31 - No Cylinder Speed Calibration...69
    523731.31 - Output Speed During Calibration...69
    523732.31 - Engine Speed Too Low During Calibration...69
    523733.31 - Engine Speed Too High During Calibration...69
    523747.14 - Not Park and Park Pressure Inputs Passive...69
    523761.03 - Clutch 4 Out of Range High...69
    523761.05 - Clutch 4 Out of Range Low...69
    523762.03 - Clutch 3 Out of Range High...69
    523762.05 - Clutch 3 Out of Range Low...69
    523763.03 - Clutch 2 Out of Range High...69
    523763.05 - Clutch 2 Out of Range Low...70
    523764.03 - Clutch 1 Out of Range High...70
    523764.05 - Clutch 1 Out of Range Low...70
    524029.00 - Inching Pedal Sensor Short to Power...70
    524029.01 - Inching Pedal Sensor Open or Short to Ground...70
    524127.04 - Declutch Pressure Switch Out of Range Low...70
    524271.03 - Clutch C Out of Range High...70
    524271.05 - Clutch C Out of Range Low...70
    524272.03 - Clutch B Out of Range High...70
    524272.05 - Clutch B Out of Range Low...70
    524273.03 - Clutch A Out of Range High...70
    524273.05 - Clutch A Out of Range Low...70
  Group 30: Standard Display Monitor (SDM) Diagnostic Trouble Codes...339
    000096.03 - Fuel Level Sensor Out of Range High...70
    Standard Display Monitor (SDM) Diagnostic Trouble Codes...339
    000096.04 - Fuel Level Sensor Out of Range Low...70
    000107.00 - Engine Air Filter Restriction Data Above Normal...70
    000126.00 - Transmission Oil Filter Restriction Data Above Normal...70
    000158.00 - System Voltage Data Above Normal...70
    000158.01 - System Voltage Data Below Normal...70
    001508.00 - Hydraulic Reservoir Oil Temperature Sensor Data Above Normal...70
    001508.03 - Hydraulic Reservoir Oil Temperature Sensor Out of Range High...70
    001508.04 - Hydraulic Reservoir Oil Temperature Sensor Out of Range Low...70
    001508.16 - Hydraulic Oil Temp Sensor Moderately High Value...70
    001713.00 - Hydraulic Oil Filter Restriction Data Above Normal...70
    002000.09 - ECU Communication Data Error...70
    002000.13 - ECU Communication Calibrate Error...70
    002003.09 - TCU Communication Data Error...70
  Group 40: Flex Load Controller (FLC) Diagnostic Trouble Codes...70
    000111.01 - Engine Coolant Level Low...70
    000589.01 - Alternator Speed Slow...70
    000746.05 - Differential Lock Open Circuit...70
    000746.06 - Differential Lock Short to Ground...70
    000977.05 - Reversing Fan Open Circuit...71
    000977.06 - Reversing Fan Short to Ground...71
    001071.03 - Proportional Fan Solenoid Short to Power...71
    001071.05 - Proportional Fan Solenoid Open Circuit or Short to Ground...71
    001550.05 - Air Conditioner Clutch Open Circuit...71
    001550.06 - Air Conditioner Clutch Short to Ground...71
    002000.09 - CAN Communication Lost for ECU...71
    002017.09 - CAN Communication Lost for SDM...71
    002141.09 - CAN Communication Lost for SSM...71
    522170.04 - Tong Squeeze Switch Short to Ground...71
    522171.04 - Tong Close Switch Short to Ground...71
    522172.04 - Tong Open Switch Short to Ground...71
    522174.04 - Grapple Rotate CCW Switch Short to Ground...71
    522175.04 - Grapple Rotate CW Switch Short to Ground...71
    522176.04 - Secondary Steering Pressure Switch Short to Ground...71
    522177.05 - Tong Close Solenoid Open Circuit...71
    522177.06 - Tong Close Solenoid Short to Ground...71
    522178.05 - Tong Open Solenoid Open Circuit...71
    522178.06 - Tong Open Solenoid Short to Ground...71
    522179.05 - Grapple Rotate CCW Solenoid Open Circuit...71
    522179.06 - Grapple Rotate CCW Solenoid Short to Ground...71
    522180.05 - Grapple Rotate CW Solenoid Open Circuit...71
    522180.06 - Grapple Rotate CW Solenoid Short to Ground...71
    522311.05 - Rear Washer Pump Open Circuit...71
    522311.06 - Rear Washer Pump Short to Ground...71
    522312.05 - Front Washer Pump Open Circuit...71
    522312.06 - Front Washer Pump Short to Ground...71
    522426.04 - Rear Wiper Park Short to Ground...71
    522427.04 - Front Wiper Park Short to Ground...71
    522433.05 - Rear Wiper Open Circuit...71
    522433.06 - Rear Wiper Short to Ground...71
    522434.05 - Front Wiper Low Speed Open Circuit...71
    522434.06 - Front Wiper Low Speed Short to Ground...71
    522435.05 - Front Wiper High Speed Open Circuit...72
    522435.06 - Front Wiper High Speed Short to Ground...72
    523577.05 - Secondary Steering Open Circuit...72
    523577.06 - Secondary Steering Short to Ground...72
    523795.05 - Dual Mode Steering Open Circuit...72
    523795.06 - Dual Mode Steering Short to Ground...72
    524097.03 - Accelerator Pedal Short to Power...72
    524097.04 - Accelerator Pedal Open or Short to Ground...72
  Group 50: Sealed Switch Module (SSM) Diagnostic Trouble Codes...506
    Sealed Switch Module (SSM) Diagnostic Trouble Codes...506
    002033.09 - SSM Lost Communications...72
    520752.04 - SSM Button 17 Stuck...72
    520752.09 - SSM Button 17 No CAN Message...72
    520753.04 - SSM Button 18 Stuck...72
    520753.09 - SSM Button 18 No CAN Message...72
    520754.04 - SSM Button 19 Stuck...72
    520754.09 - SSM Button 19 No CAN Message...72
    520755.04 - SSM Button 20 Stuck...72
    520755.09 - SSM Button 20 No CAN Message...72
    523335.04 - SSM Button 25 Stuck...72
    523335.09 - SSM Button 25 No CAN Message...72
    523336.04 - SSM Button 24 Stuck...72
    523336.09 - SSM Button 24 No CAN Message...72
    523338.04 - SSM Button 23 Stuck...72
    523338.09 - SSM Button 23 No CAN Message...72
    523339.04 - SSM Button 22 Stuck...72
    523339.09 - SSM Button 22 No CAN Message...72
    523340.04 - SSM Button 21 Stuck...72
    523340.09 - SSM Button 21 No CAN Message...72
    523849.04 - SSM Button 16 Stuck...72
    523849.09 - SSM Button 16 No CAN Message...72
    523850.04 - SSM Button 15 Stuck...72
    523850.09 - SSM Button 15 No CAN Message...72
    523852.04 - SSM Button 14 Stuck...73
    523852.09 - SSM Button 14 No CAN Message...73
    523854.04 - SSM Button 13 Stuck...73
    523854.09 - SSM Button 13 No CAN Message...73
    523855.04 - SSM Button 12 Stuck...73
    523855.09 - SSM Button 12 No CAN Message...73
    523856.04 - SSM Button 11 Stuck...73
    523856.09 - SSM Button 11 No CAN Message...73
    523857.04 - SSM Button 10 Stuck...73
    523857.09 - SSM Button 10 No CAN Message...73
    523858.04 - SSM Button 9 Stuck...73
    523858.09 - SSM Button 9 No CAN Message...73
    523860.04 - SSM Button 8 Stuck...73
    523860.09 - SSM Button 8 No CAN Message...73
    523861.04 - SSM Button 7 Stuck...73
    523861.09 - SSM Button 7 No CAN Message...73
    523862.04 - SSM Button 6 Stuck...73
    523862.09 - SSM Button 6 No CAN Message...73
    523863.04 - SSM Button 5 Stuck...73
    523863.09 - SSM Button 5 No CAN Message...73
    523864.04 - SSM Button 4 Stuck...73
    523864.09 - SSM Button 4 No CAN Message...73
    523865.04 - SSM Button 3 Stuck...73
    523865.09 - SSM Button 3 No CAN Message...73
    523867.04 - SSM Button 2 Stuck...73
    523867.09 - SSM Button 2 No CAN Message...73
    523868.04 - SSM Button 1 Stuck...73
    523868.09 - SSM Button 1 No CAN Message...73
  Group 60: Bump Shift Controller (BSC) Diagnostic Trouble Codes...73
    003651.03 - FNR Sensor Circuit Fault...73
    003651.04 - FNR Sensor Circuit Fault...73
    003651.13 - FNR Sensor Calibration Fault...73
    516205.02 - FNR Signal Data Erratic or Intermittent...73
    003654.03 - FNR Sensor Circuit Fault...74
    003654.04 - FNR Sensor Circuit Fault...74
    003654.13 - FNR Sensor Calibration Fault...74
Section 9005: Operational Checkout Procedure...609
  Group 10: Operational Checkout Procedure...609
    Operational Checkout...680
Section 9010: Engine...750
  Group 05: Theory of Operation...750
    PowerTech Plus™ 6.8L (6068) John Deere Engine—6.8L Tier 3/Stage IIIA...784
    PowerTech Plus™ 6.8L (6068) John Deere Engine—6.8L Stage II...785
    Engine Identification...754
    Coolant Heater Theory of Operation...760
    Engine Fuel System Component Location...762
    Engine Cooling System Component Location...763
    Engine Intake and Exhaust System Tier 3/Stage IIIA Component Location...764
    Engine Intake and Exhaust System Stage II Component Location...765
    Coolant Heater Component Location...766
    Engine Fluid Sample Port Locations...767
    Cold Weather Starting Aid...768
  Group 15: Diagnostic Information...750
    PowerTech Plus™ 6.8L (6068) John Deere Engine—6.8L Tier 3/Stage IIIA...784
    PowerTech Plus™ 6.8L (6068) John Deere Engine—6.8L Stage II...785
    Engine Will Not Crank...750
    Engine Coolant Temperature Above Normal...750
    Engine Coolant Temperature Below Normal...750
    Coolant Heater System Check—If Equipped...750
  Group 25: Tests...750
    PowerTech Plus™ 6.8L (6068) John Deere Engine—6.8L Tier 3/Stage IIIA...784
    PowerTech Plus™ 6.8L (6068) John Deere Engine—6.8L Stage II...785
    Fuel Line Leakage Test...786
    Air Intake System Leakage Test...787
    Air Filter Restriction Switch Test...790
    Intake Manifold Pressure Test—Turbocharger Boost—6.8L Stage II...793
    Engine Slow and Fast Idle Speed Check...795
Section 9015: Electrical System...796
  Group 05: System Information...796
    Electrical Diagram Information...806
  Group 10: System Diagrams...796
    Fuse Specifications...817
    System Functional Schematic, Wiring Diagrams, and Component Locations Legend...822
    System Functional Schematic and Section Legend...830
    Power and Ground Cables Component Location...840
    Load Center Harness (W10) Component Location...841
    Load Center Harness (W10) Wiring Diagram...843
    Engine Interface Harness (W11) Component Location...848
    Engine Interface Harness (W11) Wiring Diagram...849
    Engine Harness (W12) Component Location...850
    Engine Harness (W12) Wiring Diagram...853
    Transmission Harness (W13) Component Location...856
    Transmission Harness (W13) Wiring Diagram...857
    Hydraulic Reservoir Harness (W14) Component Location...858
    Hydraulic Reservoir Harness (W14) Wiring Diagram...860
    Fuel Sensor and Backup Alarm Harness (W15) Component Location...862
    Fuel Sensor and Backup Alarm Harness (W15) Wiring Diagram...863
    Cab Roof Harness (W16) Component Location...864
    Cab Roof Harness (W16) Wiring Diagram...866
    Radio Harness (W17) Component Location—If Equipped...869
    Radio Harness (W17) Wiring Diagram—If Equipped...870
    Secondary Steering Harness (W19) Component Location—If Equipped...871
    Secondary Steering Harness (W19) Wiring Diagram—If Equipped...873
    JDLink™ System Harnesses Component Location—MIG/GTT...874
    JDLink™ System Harnesses Component Location—MTG/SAT...876
    JDLink™ System Wiring Diagrams—MIG/GTT...878
    JDLink™ System Wiring Diagrams—MTG/SAT...879
    Pilot Control Harness (W24) Component Location...881
    Pilot Control Harness (W24) Wiring Diagram...882
    Diesel Fired Coolant Heater (DFCH) Harnesses (W25 and W26) Component Location—If Equipped...883
    Diesel Fired Coolant Heater (DFCH) Harnesses (W25 and W26) Wiring Diagram—If Equipped...885
    Forward, Neutral, and Reverse (FNR) Shift Lever Harness (W28) Component Location (S.N. 661906— )...887
    Forward, Neutral, and Reverse (FNR) Shift Lever Harness (W28) Wiring Diagram (S.N. 661906— )...888
  Group 15: Sub-System Diagnostics...797
    Power and Charge Circuits Theory of Operation...894
    Start Circuit Theory of Operation...899
    Park Brake Circuit Theory of Operation...903
    Controller Area Network (CAN) Circuit Theory of Operation...907
    Engine Control Unit (ECU) Circuit Theory of Operation...909
    Standard Display Monitor (SDM) Circuit Theory of Operation...921
    Transmission Control Unit (TCU) Circuit Theory of Operation...925
    JDLink™ Circuit Theory of Operation—If Equipped...936
    Declutch Circuit Theory of Operation...938
    Differential Lock Circuit Theory of Operation...940
    Proportional Fan Speed and Reversing Fan Circuits Theory of Operation...943
    Grapple Control Circuit Theory of Operation...947
    Secondary Steering Circuit Theory of Operation...950
    Dual Mode Steer Circuit Theory of Operation...954
    Windshield Washer and Wiper Circuits Theory of Operation...956
    Heater, Air Conditioner, and Precleaner Circuits Theory of Operation...960
    Work Lights Circuits Theory of Operation...965
  Group 16: Monitor Operation...797
    Standard Display Monitor (SDM)—Service Mode...970
    Standard Display Monitor (SDM)—Clear Codes...972
    Standard Display Monitor (SDM)—Transmission Temperature...973
    Standard Display Monitor (SDM)—Transmission Calibration...974
    Standard Display Monitor (SDM)—Engine Temperatures...975
    Standard Display Monitor (SDM)—Engine Pressures...976
    Standard Display Monitor (SDM)—Engine Speeds...977
    Standard Display Monitor (SDM)—Engine Performance...978
    Standard Display Monitor (SDM)—Engine Live Values...979
    Standard Display Monitor (SDM)—Fan Diagnostics...980
    Standard Display Monitor (SDM)—Monitor Diagnostics...981
    Standard Display Monitor (SDM)—Software...982
    Standard Display Monitor (SDM)—Hide Menu...983
    Standard Display Monitor (SDM)—Restore Defaults...984
    Standard Display Monitor (SDM)—Reverse Fan Cycle...985
    Standard Display Monitor (SDM)—Machine Option...986
  Group 20: References...798
    Electrical Component Specifications...992
    JDLink™ System Identification...997
    JDLink™ Connection Procedure—If Equipped...1000
    Service ADVISOR™ Connection Procedure...1001
    Service ADVISOR™ Diagnostic Application...1004
    Reading Diagnostic Trouble Codes (DTCs) With Service ADVISOR™ Diagnostic Application...1005
    Intermittent Diagnostic Trouble Code (DTC) Diagnostics...1008
    Transmission Diagnostic Trouble Codes—Limp Home Mode and Inchless Power Shift...1009
    Controller Area Network (CAN) Circuit Test...1010
    Bump Shifter Test...1014
    Accelerator Pedal Sensor Test...1016
    Alternator Test...1018
    Relay Test...1020
    Diode Test...1023
    Battery Test Procedure...1024
    Transmission Control Unit (TCU) Calibration...1025
    Troubleshooting Transmission Gear Solenoid...1027
    Electronic Controllers Remove and Install...1028
    Connector Terminal Test...1030
    Disconnect Tab Retainer Connectors...1033
    Disconnecting Spring Wire Clip Connectors...1034
    Remove Connector Body from Blade Terminals...1035
    Replace Metri-Pack® (Pull Type) Connectors...1036
    Replace Metri-Pack® (Push Type) Connectors...1038
    Replace Metri-Pack® Connectors...1039
    Replace DEUTSCH® Circular Connectors...1041
    Replace DEUTSCH® Rectangular or Triangular Connectors...1043
    Install DEUTSCH® Contact...1045
    Replace WEATHER PACK® Connector...1047
    Install WEATHER PACK® Contact...1049
    Replace CINCH™ Connectors...1051
    Install CINCH™ Contact...1053
    Repair 32 and 48 Way CINCH™ Connectors...1055
Section 9020: Power Train...1059
  Group 05: Theory of Operation...1059
    Power Train Component Overview...1063
    DF180 Series Powershift Transmission...1064
    TeamMate Axles...1065
    Transmission Operation...1066
    Transmission Component Identification...1067
    Transmission Hydraulic System Operation...1224
    Transmission Charge Pump Operation...1072
    Transmission Filter Bypass Valve Operation...1074
    Transmission Control Valve Port Identification...1076
    Transmission Proportional Solenoid Valves Identification...1078
    Transmission Control Valve Operation...1079
    Transmission Pressure Regulator Valve Operation...1081
    Park Brake and Differential Lock Control Valve...1083
    Park Brake Control Circuit...1085
    Park Brake Manual Release Operation...1090
    Differential Lock Control Circuit...1091
  Group 15: Diagnostic Information...1059
    Transmission Overfills With Oil...1059
    Transmission Clutch Slippage...1059
    Transmission Shifts Too Slow...1059
    Transmission Shifts Too Fast...1059
    Park Brake Activates When Service Brakes Are Applied (No Load on Engine While in Gear)...1059
    Machine Will Not Move (Load on Engine or Engine Stalls When Shifted Into Gear)...1059
    Machine Creeps in Neutral (Load Put on Engine When Service Brakes Are Applied)...1059
    Transmission System Overheats...1059
    Lube Pressure Low, Transmission Charge Pressure Normal...1059
    Excessive Transmission Noise Under Load or No Load...1059
    Machine Makes Excessive Transmission Noise When Moving...1059
    Erratic Transmission Oil Pressure...1059
    Excessive Transmission Oil Pressure...1059
    Low Transmission Oil Pressure in All Gears...1059
    Low Transmission Oil Pressure in One Gear but Correct in Other Gears...1060
    Transmission Breather Oil Leakage...1060
    Filter or Filter Oil Lines Blow Out...1060
    Low Lube Pressure (Not All Gears)...1060
    Excessive Lube Pressure (Not All Gears)...1060
    Low Transmission Oil Cooler Inlet Pressure, Correct Lube Pressure...1060
    Low Transmission Oil Cooler Inlet Pressure and Lube Pressure...1060
    Transmission Oil Cooler Externally Leaking...1060
    Machine “Jumps” When Inching Pedal Engaged...1060
    Machine Lacks Power...1060
    Excessive Machine Vibration...1060
    Cold Weather Disconnect Slips...1060
    Disconnect Clutch Noisy or Chatters...1060
    Excessive Drive Line Vibration...1060
    Park Brake Comes On While Using a Hydraulic Function...1060
    Park Brake Engages While Machine Is Moving...1060
    Park Brake Will Not Release...1060
    No Differential Lock Operation...1060
    Differential Lock Slippage...1060
    Excessive Differential and/or Axle Noise...1060
    Oil Seepage From Outer Axle Seal...1060
    Power Train Component Location...1179
  Group 20: Adjustments...1060
    Inching Pedal Adjustment...1184
    Park Brake Manual Release Procedure...1187
    Cold Weather Disconnect Linkage Adjustment—If Equipped...1190
  Group 25: Tests...1060
    JT02156A Digital Pressure/Temperature Analyzer Installation...1194
    Transmission Oil Warmup Procedure...1195
    Transmission Pump Flow Test...1196
    Transmission System Pressure Test...1199
    Transmission Lube Circuit Pressure Test...1201
    Transmission Control Circuit Pressure Test...1204
    Transmission Cooler Relief Valve Pressure Test...1207
    Park Brake Pressure Test...1209
    Differential Lock Pressure Test...1213
Section 9025: Hydraulic System...1218
  Group 05: Theory of Operation...1218
    Hydraulic System Operation...1224
    Cooling Loop and Reversing Fan Circuit Operation...1226
    Service Brake Hydraulic Circuit Operation...1228
    Steering and Secondary Steering Hydraulic Circuit Operation...1230
    Dual Mode Steering Hydraulic Circuit Operation...1232
    Pilot Control Hydraulic Circuit Operation...1235
    Grapple Rotate Hydraulic Circuit Operation...1237
    Main Hydraulic Pump and Pressure Compensator Operation...1239
    Brake Accumulator Operation...1242
    Hydraulic Reservoir Operation...1243
    Hydraulic Oil Return Filter Operation...1245
    Hydraulic Fan Filter Operation...1247
    Brake Valve Operation...1248
    Priority Valve Operation...1250
    Steering Valve and System Operation...1254
    Secondary Steering Valve Operation...1256
    120 Series Cylinder Operation...1258
    Blade Valve Section Operation...1260
    Arch and Boom Valve Section Operation...1262
    System Relief Valve Operation...1263
    Circuit Relief Valve—Adjustable Operation...1265
    Circuit Relief Valve—Non-Adjustable Operation...1267
    Grapple Tong Valve Section Operation...1268
    Grapple Tong Flow Divider Operation...1270
    Pilot Controller Operation...1272
    Grapple Rotate Solenoid Valve Operation...1273
    Dual Mode Steering Solenoid Valve Operation...1275
    Rotary Manifold Operation...1277
    Fan Pump Operation...1278
    Fan Variable Speed and Reversing Control Valve Operation...1281
    Fan Motor Operation...1283
    Hydraulic Oil Cooler Operation...1284
    Cab Tilt Circuit Operation...1285
  Group 15: Diagnostic Information...1219
    Hydraulic System Overheating...1219
    Hydraulic Function Drifts Down...1219
    No Steering or Hydraulic Functions...1219
    Hydraulic Functions Slow...1219
    Individual Functions Slow (Cycle Time Slow)...1219
    No Hydraulic Functions (Steering Normal)...1219
    Low Hydraulic Power (Pressure)...1219
    Excessive Hydraulic Pump Noise...1219
    Function Powers Up or Down Without Moving Lever...1219
    Grapple Rotate Stalls...1219
    Grapple Rotates Too Fast...1219
    Grapple Rotates Slow...1219
    Tongs Do Not Close Evenly...1219
    Tongs Open or Close Slowly...1219
    Grapple Loses Logs During Skidding...1219
    Transmission Overfills With Oil...1219
    No Steering (Hydraulic Functions Normal)...1219
    Steering Valve Does Not Center...1219
    Steering Valve Locks Up...1219
    Frames Turn Wrong Direction...1219
    Steering Slow or Hard...1219
    Steering Erratic or Spongy...1219
    Machine Wanders...1219
    Quick Steer Mode Not Engaging...1219
    Quick Steer Mode Not Disengaging...1219
    Quick Steer Mode Engaging When Disengaged...1219
    Poor or No Brakes (Other Hydraulic Systems Normal)...1219
    Brakes Overly Aggressive...1219
    Brakes Drag...1219
    Brakes Chatter or Noisy...1219
    Delay in Braking...1220
    Fan Does Not Reach Full Speed (Both Directions)...1220
    Fan Does Not Reach Full Speed (Forward Direction Only)...1220
    Fan Does Not Reach Full Speed (Reverse Direction Only)...1220
    Fan Does Not Spin (Both Directions)...1220
    Fan Does Not Slow Down Before Reversing...1220
    High Fan Cooler Pressure or Pressure Spikes...1220
    High Return Pressure at Fan Reversing Control Valve Port T...1220
    High Flow From Fan Motor Case Drain...1220
    Fan Pump Is Cavitating...1220
    Hydraulic System Component Location...1363
    Hydraulic System Schematic...1367
  Group 20: Adjustments...1220
    Service Brake Pedal Adjustment...1371
    Service Brake Inspection and Adjustment...1372
    Service Brake Bleeding Procedure...1373
    Grapple Dampener Adjustment...1377
  Group 25: Tests...1220
    D15032NU Vacuum Pump Installation...1382
    JT02156A Digital Pressure and Temperature Analyzer Kit Installation...1384
    JT07148 Digital Hydraulic Tester...1385
    Hydraulic Oil Warmup Procedure...1386
    Main Hydraulic Pump Standby Pressure Test...1387
    Main Hydraulic Pump Flow Test...1391
    Main Hydraulic Pump Leakage Test...1394
    Pressure Reducing Valve Pressure Test...1397
    Pilot Controller Pressure Test...1399
    Priority Valve and Relief Valve Pressure Test...1402
    Priority Valve Port LS Flow Test...1405
    Priority Valve and Relief Valve Leakage Test...1407
    System and Circuit Relief Valve Pressure Test...1409
    Hydraulic Component Leakage Test...1414
    Cylinder Leakage Test...1418
    Cylinder Drift Test...1420
    Dual Mode Steering Engagement Pressure Test...1422
    Grapple Rotate Motor Crossover Relief Valve Pressure Test...1425
    Grapple Rotate Solenoid Valve Neutral Leakage Test...1427
    Grapple Tong Flow Divider Relief Valve Test...1429
    Rotary Manifold Center Seal Leakage Test...1431
    Rotary Manifold Drain and Lower Seal Leakage Test...1433
    Service Brake Valve and Accumulator Pressure Test...1435
    Service Brake Valve Leakage Test...1438
    Steering Valve Neutral Leakage Test...1440
    Hydraulic Oil Filter Inspection Procedure...1442
    Cooling Fan Circuit Test...1443
    Fan Motor Case Drain Test...1448
    Secondary Steering Operation Test...1450
Section 9030: Winch...1451
  Group 05: Theory of Operation...1451
    John Deere 4000 and 6000 Winches...1453
  Group 15: Diagnostic Information...1451
    Winch Control Lever Effort Excessive...1451
    Winch Clutch Slips...1451
    Winch Free Spool Effort Excessive...1451
    Winch Brake Will Not Hold...1451
    Winch Will Not Free Spool...1451
    Transmission Oil Level Varies Excessively...1451
    Winch Makes Grinding Noise When Going from FREE SPOOL to BRAKE OFF...1451
    Winch Component Location...1469
    Winch Hydraulic Schematic...1470
  Group 20: Adjustments...1451
    Winch Control Cable Adjustment Check...1472
    Brake Off Adjustment—4000 Series Winch...1473
    Brake Off Adjustment—6000 Series Winch...1478
  Group 25: Test...1451
    Winch System Pressure Test...1487
    Winch Leakage Test...1492
    Winch Drum Rolling Drag Test...1496
Section 9031: Heating and Air Conditoning...1498
  Group 05: Theory Of Operation...1498
    Air Conditioning System Cycle of Operation...1501
  Group 15: Diagnostic Information...1498
    Air Conditioning System Visual Checks...1507
    Blower Does Not Operate in Any Speed...1498
    Blower Does Not Operate in Low Speed...1498
    Blower Does Not Operate in Medium Speed...1498
    Blower Does Not Operate in High Speed...1498
    Blower Does Not Operate in Purge Speed...1498
    Air Conditioner Does Not Operate...1498
    Air Conditioner Does Not Cool Cab Interior...1498
    Air Conditioner Runs Constantly...1498
    Interior Windows Continuously Foggy...1498
    Heater Does Not Operate...1498
    Heater Does Not Warm Cab Interior...1498
    Heating and Air Conditioning System Component Location...1540
  Group 25: Tests...1498
    R134a Air Conditioning System Test...1545
    Air Conditioner Freeze Control Switch Test...1549
    Air Conditioning Compressor Clutch Test...1551
    Air Conditioning High/Low Pressure Switch Test...1552
    Air Conditioning Expansion Valve Test...1554
    Refrigerant Leak Test...1557

John Deere 748H Skidder (S.N. 630436- ) Diagnosis and Test Service Technical Manual (TM11797)