John Deere 770G Motor Graders Diagnosis and Tests Service Technical Manual (TM14442X019)
Complete Diagnosis & Tests Technical Manual with electrical wiring diagrams for John Deere 770G Motor Graders, with workshop information to maintain, diagnose, and rebuild like professional mechanics.
John Deere 770G Motor Graders 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.
TM14442X019 - John Deere 770G Motor Graders Technical Manual - Operation and Test.pdf
PRODUCT DETAILS:
Total Pages: 1,452 pages
File Format: PDF/EPUB/MOBI/AZW (PC/Mac/Android/Kindle/iPhone/iPad; bookmarked, ToC, Searchable, Printable)
Category: Operation and Test
Language: English
John Deere - Motor Grader - 1BZ770G_ _ _C000001
John Deere - Motor Grader - 1BZ770G_ _ _D000001
TABLE OF CONTENTS (TM14442X19)
Section 9000: General Information....29
Group 01: Safety....29
Information for European Union Directives and Eurasian Economic Union Technical Regulations Compliance....36
Recognize Safety Information....41
Follow Safety Instructions....42
Operate Only If Qualified....43
Wear Protective Equipment....44
Protect Against Noise....45
Avoid Unauthorized Machine Modifications....46
Inspect Machine....47
Stay Clear of Moving Parts....48
Avoid High-Pressure Fluids....49
Avoid High-Pressure Oils....50
Work In Ventilated Area....51
Avoid Static Electricity Risk When Refueling....52
High Debris Applications....54
Prevent Fires....55
In Case of Machine Fire....57
Prevent Battery Explosions....58
Handle Chemical Products Safely....59
Handle Starting Fluid Safely....60
Decommissioning — Proper Recycling and Disposal of Fluids and Components....61
Prepare for Emergencies....62
Clean Debris from Machine....63
Use Steps and Handholds Correctly....64
Start Only From Operator's Seat....65
Use and Maintain Seat Belt....66
Heated and Ventilated Operator’s Seat....67
Prevent Unintended Machine Movement....68
Avoid Work Site Hazards....70
Keep Riders Off Machine....72
Avoid Backover Accidents....73
Avoid Machine Tip Over and Machine Damage....74
Operating or Traveling On Public Roads....75
Inspect and Maintain ROPS....76
Operating in Water and Mud....77
Travel Safely....78
Prevent Acid Burns....79
Add and Operate Attachments Safely....81
Park And Prepare For Service Safely....82
Service Machines Safely....83
Service Cooling System Safely....84
Service Accumulator Systems Safely....85
Remove Paint Before Welding or Heating....86
Make Welding Repairs Safely....87
Drive Metal Pins Safely....88
Service Tires Safely....89
Use Proper Lifting Equipment....90
Section 9001: Diagnostics....91
Group 10: Transmission Control Unit (TCU) Diagnostic Trouble Codes....104
Transmission Control Unit (TCU) Diagnostic Trouble Codes....104
000070.03 - Park Brake Pressure Switch Circuit Fault....91
000070.04 - Park Brake Pressure Switch Circuit Fault....91
000177.00 - Transmission Oil Temperature High....91
000177.03 - Transmission Oil Temperature Sensor Circuit Fault....91
000177.04 - Transmission Oil Temperature Sensor Circuit Fault....91
000177.16 - Transmission Oil Temperature High....91
000237.02 - Invalid VIN....91
000237.13 - VIN Options Not Learned....91
000237.14 - VIN Options Not Learned....91
000237.31 - VIN Message Missing....91
000444.03 - Unswitched Battery Voltage....91
000444.04 - Unswitched Battery Voltage....91
000525.02 - Undefined Gear....91
000525.07 - Undefined Gear....91
000525.12 - Undefined Gear....91
000578.00 - Rear Axle Oil Temperature High....91
000578.03 - Rear Axle Oil Temp Sensor Short to Power....91
000578.04 - Rear Axle Oil Temp Sensor Short to Ground....91
000619.05 - Transmission Park Circuit Fault....91
000619.06 - Transmission Park Circuit Fault....91
000619.07 - Park Fault....91
000619.31 - Park Fault....91
000628.12 - Control Unit Programming....91
001231.12 - Communication System Message Missing....91
001231.14 - Communication System Message Fault....91
002000.02 - Communication System Fault....91
002000.09 - Communication System Message Missing....91
002003.09 - Communication System Message Missing....91
002033.02 - Communication System Fault....91
002033.09 - Communication System Message Missing....91
002034.09 - Communication System Message Missing....92
002141.09 - Communication System Message Missing....92
002161.02 - Communication System Message Missing....92
002161.09 - Communication System Message Missing....92
002833.07 - Movement While Park Brake Applied....92
002833.31 - Park Fault....92
003510.03 - TCU Sensor Supply #2....92
003510.04 - TCU Sensor Supply #2....92
003511.03 - TCU Sensor Supply #3....92
003511.04 - TCU Sensor Supply #3....92
516321.03 - Switched Battery Voltage....92
516321.04 - Switched Battery Voltage....92
516755.05 - Transmission Rev Circuit Fault....92
516755.06 - Transmission Rev Circuit Fault....92
516770.05 - Transmission Left Rev Lamp Circuit Fault....92
516770.06 - Transmission Left Rev Lamp Circuit Fault....92
516773.05 - Transmission Right Rev Lamp Circuit Fault....92
516773.06 - Transmission Right Rev Lamp Circuit Fault....92
517056.12 - End of Line File - EOL....92
517056.31 - End of Line File - EOL....92
521601.12 - End of Line File - EOL....92
521601.31 - End of Line File - EOL....92
522087.07 - Park Fault....92
522087.12 - Park Fault....92
522087.31 - Park Fault....92
522252.00 - Clutch 1 Hold Pressure Too High....92
522252.01 - Clutch 1 Hold Pressure Too Low....92
522253.00 - Clutch 2 Hold Pressure Too High....92
522253.01 - Clutch 2 Hold Pressure Too Low....92
522254.00 - Clutch 3 Hold Pressure Too High....92
522254.01 - Clutch 3 Hold Pressure Too Low....92
522255.00 - Clutch 4 Hold Pressure Too High....92
522255.01 - Clutch 4 Hold Pressure Too Low....92
522256.00 - Clutch A Hold Pressure Too High....93
522256.01 - Clutch A Hold Pressure Too Low....93
522257.00 - Clutch B Hold Pressure Too High....93
522257.01 - Clutch B Hold Pressure Too Low....93
522258.00 - Clutch C Hold Pressure Too High....93
522258.01 - Clutch C Hold Pressure Too Low....93
522259.00 - Clutch D Hold Pressure Too High....93
522259.01 - Clutch D Hold Pressure Too Low....93
522414.00 - Transmission Clutch Temperature Fault....93
522414.03 - Transmission Clutch D Solenoid Circuit Fault....93
522414.05 - Transmission Clutch D Solenoid Circuit Fault....93
522414.06 - Transmission Clutch D Solenoid Circuit Fault....93
522507.14 - Transmission Calibration Fault....93
522517.31 - Engine Stall Prevention Active....93
523438.31 - End of Line File - EOL....93
523655.03 - Forward and Reverse Both Active....93
523697.03 - Inching Pedal Circuit Fault....93
523697.04 - Inching Pedal Circuit Fault....93
523697.31 - Inching Pedal System Fault....93
523699.31 - Transmission Speed Clutch Slipping....93
523700.31 - Transmission Clutch Slipping....93
523708.03 - Inching Pedal Circuit Fault....93
523708.04 - Inching Pedal Circuit Fault....93
523708.31 - Inching Pedal Circuit Fault....93
523712.31 - Transmission Calibration Fault....93
523717.31 - Transmission Calibration Fault....93
523718.31 - Transmission Calibration Fault....93
523720.00 - Clutch Fill Time Too Long....93
523720.01 - Clutch Fill Time Too Short....93
523721.00 - Clutch Fill Time Too Long....93
523721.01 - Clutch Fill Time Too Short....93
523722.00 - Clutch Fill Time Too Long....93
523722.01 - Clutch Fill Time Too Short....93
523723.00 - Clutch Fill Time Too Long....94
523723.01 - Clutch Fill Time Too Short....94
523724.00 - Clutch Fill Time Too Long....94
523724.01 - Clutch Fill Time Too Short....94
523725.00 - Clutch Fill Time Too Long....94
523725.01 - Clutch Fill Time Too Short....94
523726.00 - Clutch Fill Time Too Long....94
523726.01 - Clutch Fill Time Too Short....94
523727.00 - Clutch Fill Time Too Long....94
523727.01 - Clutch Fill Time Too Short....94
523728.31 - Transmission Calibration Fault....94
523729.31 - Transmission Calibration Fault....94
523730.31 - Transmission Calibration Fault....94
523731.31 - Transmission Calibration Fault....94
523732.31 - Transmission Calibration Fault....94
523733.31 - Transmission Calibration Fault....94
523734.31 - Transmission Calibration Fault....94
523761.00 - Transmission Clutch Temperature Fault....94
523761.03 - Transmission Clutch Circuit Fault....94
523761.05 - Transmission Clutch Circuit Fault....94
523761.06 - Transmission Clutch Circuit Fault....94
523762.00 - Transmission Clutch Temperature Fault....94
523762.03 - Transmission Clutch Circuit Fault....94
523762.05 - Transmission Clutch Circuit Fault....94
523762.06 - Transmission Clutch Circuit Fault....94
523763.00 - Transmission Clutch Temperature Fault....94
523763.03 - Transmission Clutch Circuit Fault....94
523763.05 - Transmission Clutch Circuit Fault....94
523763.06 - Transmission Clutch Circuit Fault....94
523764.00 - Transmission Clutch Temperature Fault....94
523764.03 - Transmission Clutch Circuit Fault....94
523764.05 - Transmission Clutch Circuit Fault....94
523764.06 - Transmission Clutch Circuit Fault....94
524173.00 - Inching Pedal Circuit Fault....95
524173.01 - Inching Pedal Circuit Fault....95
524173.03 - Inching Pedal Circuit Fault....95
524173.04 - Inching Pedal Circuit Fault....95
524173.12 - Inching Pedal System Fault....95
524173.31 - Inching Pedal Circuit Fault....95
524271.00 - Transmission Clutch Temperature Fault....95
524271.03 - Transmission Clutch Circuit Fault....95
524271.05 - Transmission Clutch Circuit Fault....95
524271.06 - Transmission Clutch Circuit Fault....95
524272.00 - Transmission Clutch Temperature Fault....95
524272.03 - Transmission Clutch Circuit Fault....95
524272.05 - Transmission Clutch Circuit Fault....95
524272.06 - Transmission Clutch Circuit Fault....95
524273.00 - Transmission Clutch Temperature Fault....95
524273.03 - Transmission Clutch Circuit Fault....95
524273.05 - Transmission Clutch Circuit Fault....95
524273.06 - Transmission Clutch Circuit Fault....95
Group 20: Engine Control Unit (ECU) Diagnostic Trouble Codes....361
Engine Control Unit (ECU) Diagnostic Trouble Codes....361
000029.03 - Decel Pedal Short to Power....95
000091.03 - Accel Pedal Short to Power....95
000091.04 - Accel Pedal Open or Short....95
000094.18 - Fuel Pressure Very Low....95
000107.00 - Engine Air Filter Restricted....95
000237.02 - Vehicle Identification Conflict....95
000237.13 - Vehicle Identification Fault....95
000237.31 - Communication Fault....95
000596.31 - Engine Speed Control Enable Switch Fault....95
000600.31 - Engine Speed Accel/Decel Switch Fault....95
001172.03 - Turbocharger Inlet Temperature Circuit Fault....95
001172.04 - Turbocharger Inlet Temperature Circuit Fault....95
001196.31 - ECU Anti Theft Locked....95
001321.05 - Starter Relay Open Circuit....96
001321.06 - Starter Relay High Current....96
001321.31 - Starter Sol Open Circuit....96
002003.09 - CAN Comm Lost for TCU....96
002033.09 - CAN Comm Lost for VCU....96
002630.00 - Charge Air Cooler Temperature Extremely High....96
002630.03 - Charge Air Cooler Temperature Sensor Circuit Fault....96
002630.04 - Charge Air Cooler Temperature Sensor Circuit Fault....96
002630.15 - Charge Air Cooler Temperature High....96
002630.16 - Charge Air Cooler Temperature Very High....96
Group 30: Primay Display Unit (PDU) Diagnostic Trouble Codes....96
Primary Display Unit (PDU) Diagnostic Trouble Codes....394
000237.02 - Vehicle Identification Number....96
000237.13 - Vehicle Identification Number....96
000237.31 - Vehicle Identification Number....96
000629.12 - Control Unit Fault....96
000920.03 - Audible Alarm Circuit Fault....96
000920.04 - Audible Alarm Circuit Fault....96
002000.09 - Communication System Fault....96
002084.09 - Communication System Message Missing....96
002251.09 - Communication System Message Missing....96
516628.10 - Display Button - UP....96
516629.10 - Display Button - DOWN....96
516630.10 - Display Button - SELECT....96
517057.12 - EE Vehicle Hours Checksum Failure....96
517170.10 - Display Button - LEFT....96
517171.10 - Display Button - RIGHT....96
520760.02 - Camera Signal....96
521859.10 - Display Button - MENU....96
524050.12 - Real Time Clock....96
Group 40: Vehicle Control Unit (VCU) Diagnostic Trouble Codes....416
Vehicle Control Unit (VCU) Diagnostic Trouble Codes....416
000096.03 - Fuel Level Sensor Circuit Fault....96
000096.04 - Fuel Level Sensor Circuit Fault....97
000117.01 - Service Brake Pressure Low....97
000117.03 - Service Brake Accumulator Switch Circuit Fault....97
000117.04 - Service Brake Accumulator Switch Circuit Fault....97
000118.01 - Service Brake Accumulator 2 Pressure Low....97
000118.03 - Service Brake Accumulator 2 Switch Circuit Fault....97
000118.04 - Service Brake Accumulator 2 Switch Circuit Fault....97
000167.03 - Switched Power Circuit Fault....97
000167.04 - Switched Power Circuit Fault....97
000168.03 - Unswitched Power Circuit Fault....97
000168.04 - Unswitched Power Circuit Fault....97
000237.02 - Vehicle Identification Fault....97
000237.13 - Vehicle Identification Fault....97
000237.31 - Vehicle Identification Fault....97
000628.12 - Control Unit Programming....97
000629.12 - Control Unit Fault....97
000639.12 - Communication System Message Missing....97
000639.14 - Communication System Fault....97
000746.03 - Differential Lock Solenoid Circuit Fault....97
000746.05 - Differential Lock Solenoid Circuit Fault....97
000746.06 - Differential Lock Solenoid Circuit Fault....97
000876.03 - A/C Compressor Clutch Circuit Fault....97
000876.05 - A/C Compressor Clutch Circuit Fault....97
000876.06 - A/C Compressor Clutch Circuit Fault....97
000880.03 - Stop Lamp Circuit (Red) Fault....97
000880.05 - Stop Lamp Circuit (Red) Fault....97
000880.06 - Stop Lamp Circuit (Red) Fault....97
000977.03 - Reversing Fan Solenoid Circuit Fault....97
000977.05 - Reversing Fan Solenoid Circuit Fault....97
000977.06 - Reversing Fan Solenoid Circuit Fault....97
000977.07 - Reversing Fan Pressure High....97
001045.04 - Brake Light Switch Circuit Fault....97
001071.03 - Fan Speed Solenoid Circuit Fault....97
001071.04 - Fan Speed Solenoid Circuit Fault....98
001071.05 - Fan Speed Solenoid Circuit Fault....98
001071.06 - Fan Speed Solenoid Circuit Fault....98
001231.12 - Communication System Message Missing....98
001231.14 - Communication System Fault....98
001569.31 - Engine Derated....98
001638.00 - Hydraulic Oil Temperature High....98
001638.03 - Hydraulic Oil Temperature Sensor Circuit Fault....98
001638.04 - Hydraulic Oil Temperature Sensor Circuit Fault....98
001713.01 - Hydraulic Oil Filter Restricted....98
001713.03 - Hydraulic Oil Filter Restriction Switch Circuit Fault....98
002000.09 - Communication System Message Missing....98
002003.09 - Communication System Message Missing....98
002040.09 - Communication System Message Missing....98
002141.09 - Communication System Message Missing....98
002348.03 - Hi Beam Light Circuit Fault....98
002348.05 - Hi Beam Light Circuit Fault....98
002348.06 - Hi Beam Light Circuit Fault....98
002350.03 - Low Beam Light Circuit Fault....98
002350.05 - Low Beam Light Circuit Fault....98
002350.06 - Low Beam Light Circuit Fault....98
002352.06 - Cab Front Work Light Circuit Fault....98
002354.06 - Front Work Light Circuit Fault....98
002356.06 - Front Cab Corner Light Circuit Fault....98
002358.06 - Front Work Light Circuit Fault....98
002362.06 - Rear Cab Corner Light Circuit Fault....98
002366.06 - Right Side Work Light Circuit Fault....98
002367.04 - Left Turn Signal Lights Command Switch Circuit Fault....98
002368.03 - Marker/Tail Light Circuit Fault....98
002368.05 - Marker/Tail Light Circuit Fault....98
002368.06 - Left Turn Light Circuit Fault....98
002369.04 - Right Turn Signal Lights Command Switch Circuit Fault....98
002370.03 - Marker/Tail Light Circuit Fault....98
002370.05 - Marker/Tail Light Circuit Fault....99
002370.06 - Right Turn Light Circuit Fault....99
002378.03 - Marker/Tail Light Circuit Fault....99
002378.05 - Marker/Tail Light Circuit Fault....99
002378.06 - Marker/Tail Light Circuit Fault....99
002642.03 - Left Heated Mirror Circuit Fault....99
002642.05 - Left Heated Mirror Circuit Fault....99
002642.06 - Left Heated Mirror Circuit Fault....99
002874.04 - Hi Beam Switch Circuit Fault....99
003511.03 - Sensor Supply 3 Circuit Fault....99
004026.03 - Right Heated Mirror Circuit Fault....99
004026.05 - Right Heated Mirror Circuit Fault....99
004026.06 - Right Heated Mirror Circuit Fault....99
516688.06 - Left Rear Beacon Light Driver Circuit Fault....99
516689.06 - Right Rear Beacon Light Driver Circuit Fault....99
516690.03 - Engine Compartment Light 1 Circuit Fault....99
516690.06 - Engine Compartment Light 1 Circuit Fault....99
516691.03 - Engine Compartment Light 2 Circuit Fault....99
516691.06 - Engine Compartment Light 2 Circuit Fault....99
520450.03 - Saddle Lock Pin Switch Circuit Fault....99
520911.03 - Engine Compartment Light Switch Circuit Fault....99
520911.04 - Engine Compartment Light Switch Circuit Fault....99
521650.00 - Hydraulic Fan Drive Pump Pressure High....99
521650.03 - Hydraulic Fan Drive Pump Pressure Circuit Fault....99
521650.04 - Hydraulic Fan Pressure Sensor Circuit Fault....99
521900.03 - Articulation Angle Sensor Circuit Fault....99
521900.04 - Articulation Angle Sensor Circuit Fault....99
522340.03 - Saddle Lock Solenoid Circuit Fault....99
522340.04 - Saddle Lock Solenoid Circuit Fault....99
522340.05 - Saddle Lock Solenoid Circuit Fault....99
522340.06 - Saddle Lock Solenoid Circuit Fault....99
522343.03 - Rear Window Defrost Relay Circuit Fault....99
522343.05 - Rear Window Defrost Relay Circuit Fault....99
522343.06 - Rear Window Defrost Relay Circuit Fault....100
522375.01 - Transmission Oil Filter Restricted....100
522375.03 - Transmission Oil Filter Restriction Switch Circuit Fault....100
522415.06 - Front Lower Washer Pump Circuit Fault....100
522416.06 - Front Lower Wiper Hi Speed Circuit Fault....100
522418.06 - Front Lower Wiper Low Speed Circuit Fault....100
522433.06 - Rear Wiper Low Speed Circuit Fault....100
522434.06 - Front Wiper Low Speed Circuit Fault....100
522435.06 - Front Wiper Hi Speed Circuit Fault....100
522796.06 - Rear Washer Pump Circuit Fault....100
522797.06 - Front Washer Pump Circuit Fault....100
523688.03 - Steering Angle Sensor Circuit Fault....100
523688.04 - Steering Angle Sensor Circuit Fault....100
523689.04 - Diff Lock Switch Circuit Fault....100
523901.04 - Front Window Switch Circuit Fault....100
524044.01 - Axle Oil Filter Restricted....100
524044.03 - Axle Oil Filter Restriction Switch Circuit Fault....100
Group 70: Switch Module 1 (SM1) Diagnostic Trouble Codes....638
Switch Module 1 (SM1) Diagnostic Trouble Codes....638
000629.12 - Control Unit Fault....100
002033.09 - Communication System Message Missing....100
002634.04 - Ignition Relay Circuit Fault....100
002634.05 - Ignition Relay Circuit Fault....100
520752.04 - SSM Button Stuck....100
520752.09 - Lost Heated Side Mirrors LED Message....100
520753.04 - SSM Button Stuck....100
520753.09 - Lost Rear Defrost LED Message....100
520754.04 - SSM Button Stuck....100
520754.09 - Lost Lower Washer LED Message....100
520755.04 - SSM Button Stuck....100
520755.09 - Lost Lower Wiper LED Message....100
523335.04 - SSM Button Stuck....100
523335.09 - Lost Rear Wiper LED Message....100
523336.04 - SSM Button Stuck....101
523336.09 - Lost Rear Washer LED Message....101
523340.04 - SSM Button Stuck....101
523340.09 - Lost Auto Trans LED Message....101
523849.04 - SSM Button Stuck....101
523849.09 - Lost A/C LED Message....101
523850.04 - SSM Button Stuck....101
523850.09 - Lost Front Wiper LED Message....101
523852.04 - SSM Button Stuck....101
523852.09 - Lost Front Washer LED Message....101
523854.04 - SSM Button Stuck....101
523854.09 - Lost R Cab Work Lts LED Message....101
523855.04 - SSM Button Stuck....101
523855.09 - Lost Cab Corner Lts LED Message....101
523856.04 - SSM Button Stuck....101
523856.09 - Lost Saddle Lock Pin LED Message....101
523857.04 - SSM Button Stuck....101
523857.09 - Lost Drive Lts LED Message....101
523858.04 - SSM Button Stuck....101
523858.09 - Lost Frame Work Lt LED Message....101
523860.04 - SSM Button Stuck....101
523860.09 - Lost Cab Front Lts LED Message....101
523862.04 - SSM Button Stuck....101
523862.09 - Lost Park Brake Switch LED Message....101
523864.04 - SSM Button Stuck....101
523864.09 - Lost Hazard LED Message....101
523865.04 - SSM Button Stuck....101
523865.09 - Lost Beacon Light LED Message....101
523867.04 - SSM Button Stuck....101
523867.09 - Lost Ignition Off LED Message....101
523868.04 - SSM Button Stuck....101
523868.09 - Lost Ignition On LED Message....101
Group 90: Cab Video Display (VC1) Diagnostic Trouble Codes....688
Cab Video Display (VC1) Diagnostic Trouble Codes....688
000629.12 - Monitor Watchdog....102
516628.10 - Monitor Button - UP....102
516629.10 - Monitor Button - DOWN....102
516630.10 - Monitor Button - SELECT....102
520760.02 - Camera Signal....102
521857.10 - Monitor Button - NEXT....102
521858.10 - Monitor Button - BACK....102
521859.10 - Display Button - MENU....102
Section 9005: Operational Checkout Procedure....697
Group 10: Operational Checkout Procedure....697
Operational Checkout....726
Section 9010: Engine....754
Group 05: Theory of Operation....754
John Deere Engine Theory of Operation....756
Cold Weather Start Aid....757
Engine Identification....759
Engine Speed....763
Group 10: System Diagrams....754
Engine Cooling System Component Location....766
Engine Fuel System Component Location....768
Engine Intake and Exhaust Component Location....770
Group 15: Diagnostic Information....754
John Deere Engine Diagnostic Information....773
Group 25: Tests....754
John Deere Engine....775
Fluid Sampling Procedure....776
Engine Slow and Fast Idle Speed Check....781
Radiator Temperature Differential Test....782
Section 9015: Electrical System....784
Group 05: Theory of Operation....784
Controller Area Network (CAN) Theory of Operation....791
Start and Charge Circuits Theory of Operation....794
Park Brake Circuit Theory of Operation....799
Primary Display Unit (PDU) and Sealed Switch Module (SSM) Circuits Theory of Operation....801
Engine Control Unit (ECU) Circuit Theory of Operation....805
Transmission Control Unit (TCU) Circuit Theory of Operation....810
Vehicle Control Unit (VCU) Circuit Theory of Operation....818
Hydraulic Fan Speed and Fan Reversing Circuits Theory of Operation....824
Differential Lock Circuit Theory of Operation....829
Saddle Lock Circuit Theory of Operation....832
Drive Lights, Marker Lights, Hazards, and Turn Lights Circuits Theory of Operation....834
Work Lights Circuit Theory of Operation....838
Brake Lights and Brake Accumulator Pressure Warning Circuit Theory of Operation....841
Backup Lights Circuit Theory of Operation—If Equipped....844
Beacon Light Circuit Theory of Operation—If Equipped....846
Wipers and Washers Circuits Theory of Operation....848
Rear Window Defog and Heated Side Mirrors Circuits Theory of Operation....853
Air Conditioner, Heater, and Precleaner Circuits Theory of Operation....855
JDLink™ Circuit Theory of Operation....859
Group 10: System Diagrams....784
Electrical Diagram Information....865
Electrical Schematic Symbols....869
Fuse and Relay Specifications....872
System Functional Schematic, Wiring Diagram, and Component Location Master Legend....874
System Functional Schematic....880
Power and Ground Cables Component Location....886
Power and Ground Cables Wiring Diagram....887
Cab Roof Harness (W14) Component Location....889
Cab Roof Harness (W14) Wiring Diagram....890
Cab Interior Harness (W16) Component Location....891
Cab Interior Harness (W16) Wiring Diagram....893
Blade Impact Harness (W19) Component Location—If Equipped....898
Blade Impact Harness (W19) Wiring Diagram—If Equipped....899
Turn-Tail-Stop Light Harness (W20) Component Location....900
Turn-Tail-Stop Light Harness (W20) Wiring Diagram....901
Drive and Turn Lights Harnesses (W22 and W23) Component Location....902
Drive and Turn Lights Harnesses (W22 and W23) Wiring Diagram....903
Steering Angle Sensor Harness (W24) Component Location....907
Steering Angle Sensor Harness (W24) Wiring Diagram....908
Front Platform Harness (W25) Component Location....909
Front Platform Harness (W25) Wiring Diagram....911
Rear Platform Harness (W26) Component Location....913
Rear Camera Harness (W27) Component Location—If Equipped....914
Rear Camera Harness (W27) Wiring Diagram—If Equipped....915
Front Camera Harness (W28) Component Location—If Equipped....916
Front Camera Harness (W28) Wiring Diagram—If Equipped....917
Fan Door Harness (W31) Component Location....918
Fan Door Harness (W31) Wiring Diagram....919
Heater and Air Conditioner Harness (W32) Component Location....920
Heater and Air Conditioner Harness (W32) Wiring Diagram....921
Radio Harness (W33) Component Location....922
Radio Harness (W33) Wiring Diagram....924
Midstructure Harness (W34) Component Location....925
Midstructure Harness (W34) Wiring Diagram....926
Transmission Harness (W35) Component Location....927
Transmission Harness (W35) Wiring Diagram....929
Tilt Console Harness (W36) Component Location....931
Tilt Console Harness (W36) Wiring Diagram....932
Engine Interface Harness (W50) Component Location....933
Engine Interface Harness (W50) Wiring Diagram....934
Engine Harness (W53) Component Location....935
Engine Harness (W53) Wiring Diagram....938
Auxiliary Radio Input Harness (W59) Component Location—If Equipped....943
Auxiliary Radio Input Harness (W59) Wiring Diagram—If Equipped....944
License Plate Harness (W65) Component Location....945
License Plate Harness (W65) Wiring Diagram....946
Camera Display Harness (W67) Component Location....947
Camera Display Harness (W67) Wiring Diagram....948
Engine Work Light Harness (W79) Component Location....949
Engine Work Light Harness (W79) Wiring Diagram....950
JDLink™ Modular Telematics Gateway (MTG) Harness (W6002) Component Location—If Equipped....951
JDLink™ Modular Telematics Gateway (MTG) Harness (W6002) Wiring Diagram—If Equipped....952
Group 15: Diagnostic Information....786
Electrical Component Specifications....960
Vehicle Control Unit (VCU) Outputs....967
Service ADVISOR™ Application....971
Service ADVISOR™ Connection Procedure....972
Service ADVISOR™ Remote (SAR) Connection Procedure....974
Reading Diagnostic Trouble Codes With Service ADVISOR™ Diagnostic Application....978
Intermittent Diagnostic Trouble Code (DTC) Diagnostics....980
JDLink™ Connection Procedure—If Equipped....981
Group 16: Monitor Operation....786
Primary Display Unit (PDU)—Service Mode....984
Service Menu—Display Settings—Menu Access....986
Service Menu—Diagnostics—Codes—Clear Codes....987
Service Menu—Diagnostics—OBD Tool....988
Service Menu—Diagnostics—OBD Tool—Transmission Control Unit (TCU)....990
Service Menu—Diagnostics—OBD Tool—Vehicle Control Unit (VCU)....1000
Service Menu—Machine Setup—Tire Size....1010
Service Menu—Machine Setup—Auto Shutdown....1011
Group 17: Diagnostic Test Box....786
Setup and Functional Test....1021
Two Wire Sensor Circuit Check—Out of Range High....1030
Two Wire Sensor Circuit Check—Out of Range Low....1032
Three Wire Sensor Circuit Check—Out of Range High....1034
Three Wire Sensor Circuit Check—Out of Range Low....1036
Group 20: Adjustments....787
Transmission Control Unit (TCU) Calibration....1040
CAN Circuit Testing....1042
Lower Windshield Wiper Proximity Switch Adjustment and Installation....1048
Articulation Sensor Linkage Adjustment (Rear Steer)....1050
Articulation Sensor Calibration Procedure....1051
Steering Angle Sensor Calibration Procedure....1052
Set Machine Hours in Primary Display Unit (PDU)....1053
Group 25: Tests....787
Component Exchange Diagnostic Test....1056
Alternator Test....1058
Output Shaft Speed Sensor Test....1062
Inching Pedal Module Test....1063
Accelerator Pedal Sensor Test....1067
Hydraulic Pump Pressure Sensor Test....1069
Hydraulic Fan Speed Sensor Test....1072
Switch Test....1075
Wiper Motor Test....1078
Electrical Component Checks....1080
Connector Terminal Test....1083
Section 9020: Power Train....1086
Group 05: Theory of Operation....1086
DF180 Powershift Transmission Operation....1090
Differential Lock Operation....1092
Internal Park Brake Operation....1096
Rear Axle and Tandem Operation....1098
Group 10: System Diagrams....1086
Power Train Schematic....1101
Power Train Component Location....1103
Group 15: Diagnostic Information....1086
Transmission Overfills With Oil....1086
Transmission Slippage....1086
Machine “Jumps” When Inching Pedal is Engaged....1086
Machine Lacks Power Or Moves Slow....1086
Transmission Shifts Too Slow (Machine Stops When Changing Gears Under Load)....1086
Transmission Shifts Too Quickly....1086
Machine Will Not Move in Any Gear and Park Brake Indicator Light is on (No Load Put on Engine When Shifted Into Gear)....1086
Machine Will Not Move (Load Put on Engine or Engine Stalls When Shifted Into Gear)....1086
Low Pressure In Different Gears Using Same Proportional Solenoid Valve....1086
Machine Creeps In Neutral (Load Put On Engine When Service Brakes Are Applied)....1086
Machine Creeps In Gear With Inching Pedal Fully Depressed....1086
Transmission System Overheats....1086
Gear Selector Module (GSM) Does Not Move Freely....1086
Excessive Transmission Noise (Under Load or No Load)....1086
Transmission Engages in a Gear, but Not Gear Selected....1086
Transmission Fails to Change Gear From First Gear Selected....1086
Transmission Faults to Neutral....1086
Excessive Machine Vibration....1086
Erratic Transmission Oil Pressure....1086
Excessive Oil Pressure....1086
Low Oil Pressure In All Gears....1086
Low Pressure In One Gear But Correct In Other Gears....1086
Transmission Breather Oil Leakage....1087
Filter Or Filter Oil Lines Blow Out....1087
Low Lube Pressure In Some Gears But Correct In Other Gears....1087
Excessive Lube Pressure In Some Gears But Correct In Other Gears....1087
Low Transmission Cooler Inlet Pressure And Lube Pressure....1087
Park Brake Engages While Vehicle Is Moving....1087
Park Brake Will Not Release....1087
Park Brake Will Not Hold....1087
Park Brake Overheats....1087
Park Brake Noisy....1087
No Differential Lock Operation....1092
Differential Lock Slippage....1087
Excessive Differential and/or Axle Noise....1087
Group 25: Tests....1087
Differential Oil Warm-Up Procedure....1160
Differential Lock Valve Pressure Test....1162
Differential Lock Charge Pump Flow Test....1164
Differential Oil Cooler Differential Pressure Test....1166
Differential Oil Cooler Bypass Valve Pressure Test....1170
Transmission Oil Cooler Differential Pressure Test....1173
Park Brake Release Pressure Test....1177
Section 9025: Hydraulic System....1178
Group 05: Theory of Operation....1178
Hydraulic System Operation....1183
Hydraulic Pump Operation....1185
Hydraulic Fan Pump Operation....1187
Hydraulic System Manifold Operation....1188
Control Valve Operation....1191
Hydraulic Oil Filter Operation....1195
System Relief Valve Operation....1197
Circuit Relief Valve Operation....1198
Service Brake Valve Operation....1199
Service Brake Accumulator Operation....1201
Hydraulic Fan Drive Operation....1202
Steering System Operation....1204
Load Sense Operation With All Functions in Neutral....1206
Load Sense Operation With One Function Activated....1208
Load Sense Operation With Multiple Functions Activated....1210
Wheel Lean, Articulation, Circle Side Shift, Blade Pitch, and Blade Side Shift Valve Operation....1213
Circle Rotate Valve Operation....1215
Saddle Locking Pin Valve Operation....1217
Blade Lift and Auxiliary Valve Operation....1219
Blade Impact Absorption System Operation....1222
Circle Drive Gearbox Operation-Without Slip Clutch....1224
Circle Drive Gearbox Operation-With Slip Clutch....1226
Dual Input Circle Drive Gearbox Operation—If Equipped....1229
Dual Input Circle Drive Gearbox (With Slip Clutch) Operation—If Equipped....1231
Hydraulic Oil Cooler Bypass Manifold Operation....1233
Group 10: System Diagrams....1178
Hydraulic Schematic Symbols....1238
Hydraulic System Schematic....1242
Hydraulic System Component Location....1246
Group 15: Diagnostic Information....1178
No Hydraulics....1179
Hydraulic System Overheats....1179
Slow Hydraulic Functions....1179
Hydraulic Function (or Pump) Makes “Chattering” Noise....1179
Pump Appears to be Stuck At Minimum Displacement....1179
Pump Appears To Be Stuck At Maximum Displacement....1179
Function Moves Too Fast....1179
Function Drifts Down....1179
Excessive Effort to Move Function Control Lever....1179
Individual Function is Slow (Cycle Time Checked Slow)....1275
Slow or Hard Steering....1179
No Steering....1179
Erratic Steering....1179
Excessive Steering Wheel Turns to Steer Machine....1179
Wheels Move After Steering Wheel Stopped....1179
Excessive Vibration of Steering Wheel....1179
Steering Wheel Kickback....1179
Poor or No Brakes (Steering and Hydraulic System Operation Normal)....1179
Aggressive Brakes or Brakes Lock Up....1179
Brakes Drag....1179
Brakes Chatter or Noisy....1179
Delay in Braking....1179
Hydraulic Fan Does Not Reach Full Speed....1179
Hydraulic Fan Runs at Full Speed Only....1179
Hydraulic Fan Does Not Spin....1179
Hydraulic Fan Will Not Reverse Direction....1179
Group 25: Tests....1179
JT02156A Digital Pressure and Temperature Analyzer Kit Installation....1313
Hydraulic Oil Warm-Up Procedure....1314
Vacuum Pump Installation....1315
Hydraulic Pump Standby Pressure and Load Sense Standby Pressure Test....1316
Load Sense Relief Valve And Pump Relief Test....1320
System Relief Valve Pressure Test....1324
Load Sense Shuttle Valve Isolation Test....1328
Hydraulic Pump Leakage Test....1334
Hydraulic Pump Flow Test....1336
Service Brake Valve Pressure Test....1339
Service Brake Accumulator Precharge Test....1342
Service Brake Pressure Switch Test....1344
Service Brake Valve Leakage Test....1347
Hydraulic Cylinder Drift Test....1349
Hydraulic Cylinder Leakage Test....1351
Rotary Manifold Leakage Test....1354
Steering System Leakage Test....1358
Service Brake Accumulator Inlet Check Valve Leakage Test....1363
Blade Impact Absorption Accumulator Charge Pressure Test....1366
Blade Impact Absorption Accumulator Hydraulic Discharge Procedure....1369
Secondary Steering Accumulator Charge Pressure Test....1370
Blade Lift Relief Valve Test....1373
Circuit Relief Valve Test—Midmount Scarifier....1376
Saddle Locking Cylinder Pressure Reducing Valve Test....1378
Hydraulic Fan Pump Flow Test....1382
Hydraulic Fan Pump Pressure Test....1385
Hydraulic Fan Motor Case Drain Test....1388
Hydraulic Fan Motor Speed Test....1391
Hydraulic Oil Cooler Bypass Valve Pressure Test....1393
Section 9031: Heating and Air Conditioning....1395
Group 05: Theory of Operation....1395
Air Conditioning System Cycle of Operation....1398
Group 10: System Diagrams....1395
Air Conditioner and Heater Component Location....1402
Group 15: Diagnostic Information....1395
Air Conditioning System Does Not Operate....1395
Air Conditioner Does Not Cool Interior of Cab....1395
Air Conditioner Runs Constantly, Too Cold....1395
Heater System Does Not Operate....1395
Heater Does Not Warm Interior of Cab....1395
Interior Windows Continue to Fog....1395
Group 25: Tests....1395
R134a Refrigerant Cautions and Proper Handling....1429
Heater and Air Conditioner Operational Checks....1430
Operating Pressure Diagnostic Chart....1433
Air Conditioner Compressor Clutch Test....1435
Air Conditioner High/Low-Pressure Switch Test....1436
R134a Refrigerant Leak Test....1439
R134a Refrigerant Hoses and Tubing Inspection....1440
R134a Oil Charge Capacity....1441
R134a Refrigerant Charge Capacity....1442
Air Conditioner Freeze Control Switch Test....1443
Heater Blower Switch Test....1445
Heater Blower Resistor Test....1446
Heater Blower Motor Test....1448
R134a Air Conditioning System Test....1449
John Deere 770G Motor Graders Diagnosis and Tests Service Technical Manual (TM14442X019)
