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

John Deere 748H Skidder (S.N. —630435) 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.

TM10286 - John Deere 748H Skidder (S.N. —630435) Technical Manual - Diagnosis and Test.pdf
tm11044 - John Deere скиддера 748H ( —630435).pdf
tm10651 - John Deere Débusqueurs 748H (NS —630435).pdf
tm10652 - John Deere Remolcador de troncos 748H ( —630435).pdf

PRODUCT DETAILS:
Total Pages: 1,175 pages
File Format: PDF (bookmarked, ToC, Searchable, Printable)
Category: Operation and Test
Language: English Spanish French Russian
Published on 2018/09/06

TABLE OF CONTENTS
Section 9000: General Information...18
  Group 01: Safety Information...18
    Recognize Safety Information...21
    Follow Safety Instructions...22
    Operate Only If Qualified...23
    Wear Protective Equipment...24
    Avoid Unauthorized Machine Modifications...25
    Inspect Machine...26
    Stay Clear of Moving Parts...27
    Avoid High-Pressure Oils...28
    Avoid High-Pressure Fluids...29
    Do Not Use Starting Fluid...30
    Beware of Exhaust Fumes...31
    Prevent Fires...32
    Prevent Battery Explosions...33
    Handle Chemical Products Safely...34
    Dispose of Waste Properly...35
    Prepare for Emergencies...36
    Use Steps and Handholds Correctly...37
    Start Only From Operator's Seat...38
    Use and Maintain Seat Belt...39
    Prevent Unintended Machine Movement...40
    Avoid Work Site Hazards...41
    Operate Machine Safely...42
    Keep Riders Off Machine...43
    Avoid Backover Accidents...44
    Avoid Machine Tip Over...45
    Operating on Slopes...47
    Operating or Traveling On Public Roads...48
    Inspect and Maintain ROPS...49
    Keep the Operator Protective Structure (OPS) in Place...50
    Add and Operate Attachments Safely...51
    Park and Prepare for Service Safely...52
    Service Cooling System Safely...54
    Remove Paint Before Welding or Heating...55
    Make Welding Repairs Safely...56
    Drive Metal Pins Safely...57
Section 9001: Diagnostic Trouble Codes (DTC)...58
  Group 10: Engine Control Unit (ECU)...58
    Engine Control Unit (ECU) Diagnostic Trouble Codes...63
    000091.03 - Throttle Voltage Out of Range High...58
    000091.04 - Throttle Voltage Out of Range Low...58
    000647.05 - Fan Proportional Solenoid Out of Range Low...58
    000647.30 - Reversing Fan Switch Active Too Long...58
    000676.03 - Glow Plug Relay Out of Range High...58
    000676.05 - Glow Plug Relay Out of Range Low...58
    001075.05 - Low Pressure Fuel Pump Out of Range Low...58
    001075.06 - Low Pressure Fuel Pump Out of Range High...58
    002003.09 - TCU Communication Data Error...58
    002003.13 - TCU Communication Calibrate Error...58
    002017.09 - SDM Communication Data Error...58
    002017.13 - SDM Communication Calibrate Error...58
    002883.03 - Engine Speed Switch Out of Range High...58
    002883.04 - Engine Speed Switch Out of Range Low...58
  Group 20: Transmission Control Unit (TCU)...58
    Transmission Control Unit (TCU) Diagnostic Trouble Codes...101
    000177.12 - Oil Temp Sensor Out of Range...58
    000525.02 - Shift Parameter Erratic or Bad Data...58
    000525.12 - Request for an Unidentified Shift Being Made...58
    002000.09 - ECU Communication Data Error...58
    002000.13 - ECU Communication Calibrate Error...58
    298626.03 - Park and Not Park Active Out of Range High...58
    298626.04 - Park and Not Park Active Out of Range Low...58
    298678.04 - Clutch Valve Supply Voltage Out of Range Low...58
    298808.31 - Output Speed Sensor Condition Exists...58
    298809.31 - Starter Input Signal High...58
    298810.05 - Solenoid C Out of Range Low...58
    298810.06 - Solenoid C Out of Range High...58
    298811.05 - Solenoid B Out of Range Low...58
    298811.06 - Solenoid B Out of Range High...58
    298812.05 - Solenoid A Out of Range Low...59
    298812.06 - Solenoid A Out of Range High...59
    298813.05 - Solenoid 4 Out of Range Low...59
    298813.06 - Solenoid 4 Out of Range High...59
    298814.05 - Solenoid 3 Out of Range Low...59
    298814.06 - Solenoid 3 Out of Range High...59
    298815.05 - Solenoid 2 Out of Range Low...59
    298815.06 - Solenoid 2 Out of Range High...59
    298818.31 - Directional Clutch Slip Condition Exists...59
    298819.31 - Speed Clutch Slip Condition Exists...59
    298903.31 - Inching Pedal Switch Input Invalid...59
    298904.03 - Inching Pedal Potentiometer Out of Range High...59
    298904.04 - Inching Pedal Potentiometer Out of Range Low...59
    298907.31 - Not Park and Park Pressure Inputs Passive...59
    298919.31 - Not Park and Park Pressure Inputs Active...59
    298925.31 - Shifter Neutral and Reverse Inputs Active...59
    298926.31 - Shifter Neutral and Forward Inputs Active...59
    298927.31 - Neutral Forward Reverse Inputs Passive...59
    298928.31 - Upshift and Downshift Inputs Active...59
    298931.31 - Output Speed Sensor Out of Range...59
    298932.31 - Calibration Without Park Brake Applied...59
    298933.31 - EEPROM Shift Parameter Condition...59
    298934.03 - Solenoid Group 3 Out of Range High...59
    298934.04 - Solenoid Group 3 Out of Range Low...59
    298935.03 - Solenoid Group 2 Out of Range High...59
    298935.04 - Solenoid Group 2 Out of Range Low...59
    298936.03 - Solenoid Group 1 Out of Range High...59
    298936.04 - Solenoid Group 1 Out of Range Low...59
    298937.31 - Hold Clutch Pressure Condition...59
    298939.31 - Calibrating Clutch Pressure Condition...59
    298940.31 - Clutch D Fast Full Time Condition...59
    298941.31 - Clutch C Fast Fill Time Condition...59
    298942.31 - Clutch B Fast Fill Time Condition...59
    298943.31 - Clutch A Fast Fill Time Condition...60
    298944.31 - Clutch 4 Fast Fill Time Condition...60
    298945.31 - Clutch 3 Fast Fill Time Condition...60
    298946.31 - Clutch 2 Fast Fill Time Condition...60
    298947.31 - Clutch 1 Fast Fill Time Condition...60
    298948.31 - Cylinder Speed With Reverse Clutch Condition...60
    298949.31 - Cylinder Speed With Forward Clutch Condition...60
    298950.31 - Cylinder Speed Condition...60
    298951.31 - Engine Speed Too Low For Calibration...60
    298952.31 - Engine Speed Too High For Calibration...60
    298953.31 - Sump Temp Too Low For Calibration...60
    298954.05 - Solenoid 1 Out of Range Low...60
    298954.06 - Solenoid 1 Out of Range High...60
    298955.05 - Solenoid D Out of Range Low...60
    298955.06 - Solenoid D Out of Range High...60
    299359.31 - Forward and Reverse Inputs Active...60
    523120.16 - Clutch Temperature Moderately High Value...60
    523656.05 - Dual Mode Steer Output Out of Range Low...60
    523656.06 - Dual Mode Steer Output Out of Range High...60
    523689.04 - Differential Lock Short to Ground...60
    523925.03 - Dual Mode Steer Switch Out of Range High...60
    523925.04 - Dual Mode Steer Switch Out of Range Low...60
    523697.09 - Top of Clutch Input Passive Abnormal Data Rate...60
  Group 30: Standard Display Monitor (SDM)...60
    Standard Display Monitor (SDM) Diagnostic Trouble Codes...260
    000096.03 - Fuel Level Sensor Out of Range High...60
    000096.04 - Fuel Level Sender Out of Range Low...60
    000107.00 - Engine Air Filter Restriction Data Above Normal...60
    000126.00 - Transmission Oil Filter Restriction Data Above Normal...60
    000158.00 - System Voltage Data Above Normal...60
    000158.01 - System Voltage Data Below Normal...60
    000911.00 - Engine Air Filter Data Above Normal...60
    001508.00 - Hydraulic Reservoir Oil Temperature Sensor Data Above Normal...60
    001508.03 - Hydraulic Reservoir Oil Temperature Sensor Out of Range High...61
    001508.04 - Hydraulic Reservoir Oil Temperature Sensor Out of Range Low...61
    001508.16 - Hydraulic Oil Temp Sensor Moderately High Value...61
    001713.00 - Hydraulic Oil Filter Restriction Data Above Normal...61
    002000.09 - ECU Communication Data Error...61
    002000.13 - ECU Communication Calibrate Error...61
    002003.09 - TCU Communication Data Error...61
    002003.13 - TCU Communication Calibrate Error...61
Section 9005: Operational Checkout...307
  Group 10: Operational Checks...307
    Complete Machine Operational Checkout...369
Section 9010: Engine...430
  Group 05: Theory of Operation...430
    Engine Fuel System Component Location...433
    Engine Cooling System Component Location...435
    Engine Fluid Sample Port Locations...436
    Cold Weather Starting Aid...437
  Group 15: Diagnostic Information...430
    PowerTech Plus™ 4.5 L and 6.8 L (4045 and 6068) John Deere Engines...439
    Engine Will Not Crank...430
    Engine Coolant Temperature Above Normal...430
    Engine Coolant Temperature Below Normal...430
  Group 25: Tests...430
    Fuel Line Leakage Test...447
    Air Intake System Leakage Test...448
    Air Filter Restriction Switch Test...451
    Engine Slow and Fast Idle Speed Check...454
Section 9015: Electrical System...455
  Group 05: System Information...455
    Electrical Diagram Information...464
  Group 10: System Diagrams...455
    Fuse Specifications...472
    System Functional Schematic, Wiring Diagrams and Component Locations Legend...474
    System Functional Schematic and Section Legend...480
    Cab Roof Harness (W9) Component Location...492
    Cab Roof Harness (W9) Wiring Diagram...494
    Load Center Harness (W10) Component Location...496
    Load Center Harness (W10) Wiring Diagram...498
    Engine Interface Harness (W11) Component Location...501
    Engine Interface Harness (W11) Wiring Diagram...502
    Engine Harness (W12) Component Location...504
    Engine Harness (W12) Wiring Diagram...506
    Transmission Harness (W13) Component Location...508
    Transmission Harness (W13) Wiring Diagram...509
    Hydraulic Reservoir Harness (W14) Component Location...510
    Hydraulic Reservoir Harness (W14) Wiring Diagram...511
    Fuel Sensor and Backup Alarm Harness (W15) Component Location...512
    Fuel Sensor and Backup Alarm Harness (W15) Wiring Diagram...513
    Radio Harness (W17) Component Location...514
    Radio Harness (W17) Wiring Diagram...515
    Secondary Steering Harness (W19) Component Location...516
    Secondary Steering Harness (W19) Wiring Diagram...517
    Grapple Rotate and Open/Close Harness (W24) Component Location—Pilot Control...519
    Grapple Rotate and Open/Close Harness (W24) Wiring Diagram—Pilot Control...521
    Grapple Rotate Harness (W25) Component Location—Mechanical Linkage...522
  Group 15: Sub-System Diagnostics...455
    Power and Charging Circuits Theory of Operation...527
    Start Circuit Theory of Operation...531
    Park Brake Circuit Theory of Operation...534
    Controller Area Network (CAN) Circuit Theory of Operation...537
    Engine Control Unit (ECU) Circuits Theory of Operation...539
    Proportional Fan Speed and Reversing Fan Circuits Theory of Operation...549
    Transmission Control Unit (TCU) Circuits Theory of Operation...552
    Standard Display Monitor (SDM) Circuits Theory of Operation...557
    Grapple Control Circuit Theory of Operation...560
    Secondary Steering Circuit Theory of Operation...562
    Dual Mode Steer Circuit Theory of Operation...564
    De-clutch Circuit Theory of Operation (S.N. 620843—)...566
  Group 16: Monitor Operation...456
    Standard Display Monitor (SDM) Operation...571
    Standard Display Monitor (SDM) Menu Structure—Service Mode...575
    Standard Display Monitor (SDM)—Temperature Format...579
    Standard Display Monitor (SDM)—Change Units...581
    Standard Display Monitor (SDM)—Hide—Unhide Main Menu...582
  Group 20: References...456
    Electrical Component Specifications...587
    Diagnostic Trouble Codes (DTC) Quick Reference List...590
    Service ADVISOR™ Connection Procedure...595
    Intermittent Diagnostic Trouble Code (DTC) Diagnostics...598
    Reading Diagnostic Trouble Codes with Service ADVISOR™ Diagnostic Application...599
    Transmission Diagnostic Trouble Codes—Limp Home Mode and Inchless Power Shift...600
    Calibration of Transmission Control Unit (TCU)...601
    Troubleshooting Transmission Gear Solenoid Diagnostic Trouble Codes...604
    CAN Circuit Test...606
    Two-Wire Sensor Circuit Check Using Standard Display Monitor (SDM) or SERVICE ADVISOR SERVICE ADVISOR is a trademark of Deere & Company...456
    Three-Wire Sensor Circuit Check Using Standard Display Monitor (SDM) or SERVICE ADVISOR SERVICE ADVISOR is a trademark of Deere & Company...456
    Bump Shifter Test...612
    Bump Shifter Default Gear Selection...614
    Relay Test...616
    Diode Test...618
    Diode Module Test...619
    Alternator Test...621
    Battery Test Procedure...622
    Connector Terminal Test...623
    Remove and Install Transmission Control Unit (TCU)...626
    Remove and Install Engine Control Unit (ECU)...628
    Remove and Install Single Lever Pilot Control Relays...629
    Replace DEUTSCH DEUTSCH is a trademark of Deutsch Co. Rectangular or Triangular Connectors...457
    Replace DEUTSCH DEUTSCH is a trademark of the Deutsch Co. Connectors...457
    Install DEUTSCH DEUTSCH is a trademark of the Deutsch Co. Contact...457
    Replace WEATHER PACK WEATHER PACK is a trademark of Packard Electric. Connector...457
    Replace SURE-SEAL SURE-SEAL is a trademark of ITT Cannon Electric. Connector with WEATHER PACK WEATHER PACK is a trademark of Packard Electric. Connector...457
    Install WEATHER PACK WEATHER PACK is a trademark of Packard Electric. Contact...457
    Remove Connector Body from Blade Terminals...642
    Crimper Tool For Transmission Control Unit Connector—Operation...643
    Crimper Tool For Transmission Control Unit Connector—Remove And Install Die Set...644
    Crimper Tool For Transmission Control Unit Connector—Contact Support Adjustment...646
    Crimper Tool For Transmission Control Unit Connector—Crimping Procedure...647
    Crimper Tool For Transmission Control Unit Connector—Crimp Height Inspection...650
    Crimper Tool For Transmission Control Unit Connector—Crimp Height Adjustment...651
    Replace Transmission Control Unit Connector Terminals...653
    Cinch CP Connector Assemble...655
    Cinch CP Connector Terminal Removal...662
    Cinch CP Connector Terminal Hand Crimp Process...665
    Transmission Control Unit (TCU) Remove and Install...669
    Engine Control Unit (ECU) Remove and Install...671
    Single Lever Pilot Control Relays Remove and Install...672
Section 9020: Power Train...673
  Group 05: Theory of Operation...673
    Power Train Component Overview...677
    DF180 Series Powershift Transmission...678
    TeamMate Axles...679
    Transmission Operation...680
    Transmission Component Identification...681
    Transmission Diagram...683
    Transmission Hydraulic System Operation...843
    Transmission Charge Pump Operation...688
    Transmission Filter Bypass Valve Operation...690
    Transmission Control Valve Port Identification...692
    Transmission Proportional Solenoid Valves Identification...694
    Transmission Control Valve Operation...695
    Transmission Pressure Regulator Valve Operation...697
    Park Brake and Differential Lock Control Valve...699
    Park Brake Control Circuit...701
    Park Brake Manual Release Operation...706
    Differential Lock Control Circuit...708
    Cold Weather Transmission Disconnect Operation—If Equipped...712
  Group 15: Diagnostic Information...673
    Transmission Overfills With Oil...673
    Transmission Clutch Slippage...673
    Transmission Shifts Too Slow...673
    Transmission Shifts Too Fast...673
    Park Brake Activates When Service Brakes Are Applied (No Load on Engine While in Gear)...673
    Machine Will Not Move (Load on Engine or Engine Stalls When Shifted Into Gear)...673
    Machine Creeps in Neutral (Load Put on Engine When Service Brakes are Applied)...673
    Transmission System Overheats...673
    Lube Pressure Low, Transmission Charge Pressure Normal...673
    Excessive Transmission Noise Under Load or No Load...673
    Machine Makes Excessive Transmission Noise When Moving...673
    Erratic Transmission Oil Pressure...673
    Excessive Transmission Oil Pressure...674
    Low Transmission Oil Pressure in All Gears...674
    Low Transmission Oil Pressure in One Gear but Correct in Other Gears...674
    Transmission Oil Cooler Externally Leaking...674
    Transmission Breather Oil Leakage...674
    Filter or Filter Oil Lines Blow Out...674
    Low Lube Pressure (Not All Gears)...674
    Excessive Lube Pressure (Not All Gears)...674
    Low Transmission Oil Cooler Inlet Pressure, Correct Lube Pressure...674
    Low Transmission Oil Cooler Inlet Pressure and Lube Pressure...674
    Machine “Jumps” When Inching Pedal Engaged...674
    Machine Lacks Power...674
    Excessive Machine Vibration...674
    Diagnose Cold Weather Disconnect Malfunctions...674
    Excessive Drive Line Vibration...674
    Park Brake Comes On While Using a Hydraulic Function...674
    Park Brake Engages While Machine Is Moving...674
    Park Brake Will Not Release...674
    No Differential Lock Operation...674
    Differential Lock Slippage...674
    Excessive Differential and/or Axle Noise...674
    Oil Seepage From Outer Axle Seal...674
    Power Train Component Location...798
  Group 20: Adjustments...674
    Inching Pedal Adjustment...803
    Park Brake Manual Release Procedure...806
    Cold Weather Disconnect Linkage Adjustment—If Equipped...811
  Group 25: Tests...674
    Transmission Oil Warm-Up Procedure...815
    Transmission Pump Flow Test...816
    Transmission System Pressure Test...819
    Transmission Lube Circuit Pressure Test...821
    Transmission Control Circuit Pressure Test...824
    Transmission Cooler Relief Valve Pressure Test...827
    Park Brake Pressure Test...829
    Differential Lock Pressure Test...833
Section 9025: Hydraulic System...838
  Group 05: Theory of Operation...838
    Hydraulic System Operation...843
    Main Pump and Reservoir Hydraulic Circuit Operation...844
    Cooling Loop and Reversing Fan Circuit Operation...846
    Service Brake Hydraulic Circuit Operation...848
    Steering and Secondary Steering Hydraulic Circuit Operation...850
    Dual Mode Steering Hydraulic Circuit Operation...852
    Pilot Control Hydraulic Circuit Operation...855
    Grapple Rotate Hydraulic Circuit Operation...858
    Main Hydraulic Pump and Pressure Compensator Operation...859
    Brake Accumulator Operation...862
    Hydraulic Reservoir Operation...863
    Hydraulic Oil Return Filter Operation...865
    Hydraulic Fan Filter Operation...867
    Brake Valve Operation...868
    Priority Valve Operation...871
    Steering Valve and System Operation...875
    Secondary Steering Inlet Manifold Operation...877
    120 Series Cylinder Operation...879
    Blade Manually Operated Valve Section Operation...881
    Arch and Boom Pilot Operated Valve Section Operation...883
    System Relief Valve Operation...884
    Circuit Relief Valve—Adjustable with Anticavitation Operation...886
    Circuit Relief Valve—Non-Adjustable Operation...888
    Grapple Tong Flow Divider Operation...889
    Pilot Controller Operation...891
    Grapple Rotate Solenoid Valve Operation...892
    Dual Mode Steering Solenoid Valve Operation...894
    Rotary Manifold Operation...896
    Fan Pump Operation...897
    Fan Variable Speed and Reversing Manifold Operation...900
    Reversing Fan Motor Operation...902
    Hydraulic Oil Cooler Operation...903
    Cab Tilt Circuit Operation...904
  Group 15: Diagnostic Information...839
    Hydraulic System Overheating...839
    Hydraulic Function Drifts Down...839
    No Steering or Hydraulic Functions...839
    Hydraulic Functions Slow...839
    Individual Functions Slow (Cycle Time Slow)...839
    No Hydraulic Functions (Steering Normal)...839
    Low Hydraulic Power (Pressure)...839
    Excessive Hydraulic Pump Noise...839
    Function Powers Up or Down Without Moving Lever...839
    Grapple Rotate Stalls...839
    Grapple Rotates Too Fast...839
    Grapple Rotates Slow...839
    Tongs Do Not Close Evenly...839
    Tongs Open or Close Slowly...839
    Grapple Loses Logs During Skidding...839
    Transmission Overfills With Oil...839
    No Steering (Hydraulic Functions Normal)...839
    Steering Valve Does Not Center...839
    Steering Valve Locks Up...839
    Frames Turn Wrong Direction...839
    Steering Slow or Hard...839
    Steering Erratic or Spongy...839
    Machine Wanders...839
    Quick Steer Mode Not Engaging...839
    Quick Steer Mode Not Engaging...839
    Quick Steer Mode Not Disengaging...839
    Quick Steer Mode Engaging When Disengaged...839
    Poor or No Brakes (Other Hydraulic Systems Normal)...839
    Brakes Overly Aggressive...839
    Brakes Drag...839
    Brakes Chatter or Noisy...840
    Delay in Braking...840
    Fan Does Not Reach Full Speed (Both Directions)...840
    Fan Does Not Reach Full Speed (Forward Direction Only)...840
    Fan Does Not Reach Full Speed (Reverse Direction Only)...840
    Fan Does Not Spin (Both Directions)...840
    Fan Does Not Slow Down Before Reversing...840
    High Cooler Pressure or Pressure Spikes...840
    High Return Pressure at Fan Reversing Manifold Port T...840
    High Flow From Fan Motor Case Drain...840
    Fan Pump is Cavitating...840
    Hydraulic System Component Location...985
    Hydraulic System Schematic...988
  Group 20: Adjustments...840
    Service Brake Pedal Adjustment...993
    Service Brake Inspection and Adjustment...994
    Service Brake Bleeding Procedure...995
    Grapple Dampener Adjustment...999
  Group 25: Tests...840
    D15032NU Vacuum Pump Installation...1003
    JT02156A Digital Pressure and Temperature Analyzer Installation...1004
    JT07148 Digital Hydraulic Tester...1006
    Hydraulic Oil Warm-Up Procedure...1007
    Main Hydraulic Pump Identification...1008
    Main Hydraulic Pump Standby Pressure Test...1009
    Main Hydraulic Pump Flow Test...1012
    Main Hydraulic Pump Leakage Test...1015
    Pressure Reducing Valve Pressure Test...1017
    Pilot Controller Pressure Test...1019
    Priority Valve and Relief Valve Pressure Test...1022
    Priority Valve "LS" Port Flow Test...1025
    Priority Valve and Relief Valve Leakage Test...1027
    System and Circuit Relief Valve Pressure Test...1029
    Hydraulic Component Leakage Test...1034
    Cylinder Leakage Test...1038
    Cylinder Drift Test...1040
    Dual Mode Steering Engagement Pressure Test...1042
    Grapple Rotate Motor Crossover Relief Valve Pressure Test...1045
    Grapple Rotate Solenoid Valve Neutral Leakage Test...1047
    Grapple Tong Flow Divider Relief Valve Test...1049
    Rotary Manifold Center Seal Leakage Test...1051
    Rotary Manifold Drain and Lower Seal Leakage Test...1053
    Service Brake Valve and Accumulator Pressure Test...1055
    Service Brake Valve Leakage Test...1058
    Steering Valve Neutral Leakage Test...1061
    Hydraulic Functions Cycle Time Test...1063
    Hydraulic Oil Filter Inspection Procedure...1065
    Cooling Fan Circuit Test Procedure...1066
    Fan Motor Case Drain Test...1071
    Secondary Steering Operation Test...1073
Section 9030: Winch...1076
  Group 05: Theory of Operation...1076
    John Deere 4000 and 6000 Winches...1078
  Group 15: Diagnostic Information...1076
    Winch Control Lever Effort Excessive...1076
    Winch Clutch Slips...1076
    Winch Free Spool Effort Excessive...1076
    Winch Brake Will Not Hold...1076
    Winch Will Not Free Spool...1076
    Transmission Oil Level Varies Excessively...1076
    Winch Makes Grinding Noise When Going from FREE SPOOL to BRAKE OFF...1076
    Winch Component Location...1094
    Winch Hydraulic Schematic...1095
  Group 20: Adjustments...1076
    Winch Control Cable Adjustment Check...1097
    Brake Off Adjustment—4000 Series Winch...1098
    Brake Off Adjustment—6000 Series Winch...1103
  Group 25: Test...1076
    Winch System Pressure Test...1112
    Winch Leakage Test...1117
    Winch Drum Rolling Drag Test...1121
Section 9031: Heating and Air Conditoning...1123
  Group 05: Theory Of Operation...1123
    Air Conditioning System Cycle Of Operation...1126
  Group 15: Diagnostic Information...1123
    Diagnose Air Conditioning System Malfunctions...1123
    Diagnose Heater System Malfunctions...1123
    Air Conditioning System Component Location...1153
  Group 25: Tests...1123
    Air Conditioning System Checks...1158
    R134a Air Conditioning System Test...1161
    Air Conditioner Freeze Control Switch Test...1165
    Air Conditioning Compressor Clutch Test...1167
    Air Conditioning High/Low Pressure Switch Test...1168
    Air Conditioning Expansion Valve Test...1170
    Refrigerant Leak Test...1173

John Deere 748H Skidder Diagnosis and Test Service Technical Manual (TM10286)