John Deere 870G, 870GP, 872G and 872GP Motor Grader Diagnostic, Operation and Test Manual (TM12143)

John Deere 870G, 870GP, 872G and 872GP Motor Grader Diagnostic, Operation and Test Manual (TM12143 22DEC15)

This official service manual offers detailed operation guidelines, diagnostic codes, and testing procedures for the John Deere 870G, 870GP, 872G, and 872GP Motor Graders. Covering system diagnostics, engine and hydraulic testing, powertrain troubleshooting, and electronic subsystem calibration, the manual enables technicians to perform accurate maintenance, fault isolation, and performance tuning on complex grader systems.

Model Covers:

John Deere 870G, 870GP, 872G, 872GP Motor Graders

SN. 634380-656507

Engines 6090HDW11

File Format: PDF

Size: 37.6 MB

No. of pages: 996

Language: English

Delivery Method: Instant Download – Access your file immediately after purchase.

📑 Included Sections:

Safety and General Information

• Technical safety protocols for servicing high-pressure and high-voltage systems
• Lockout/tagout procedures and operator exposure mitigation
• Material hazard classification and system depressurization guidelines

System Diagnostics and Electronic Testing

• Electronic Control Unit (ECU), Basic Control Unit (BCU), and display module fault code referencing
• Controller Area Network (CAN) diagnostics and inter-module signal tracing
• Sensor calibration workflows, actuator test commands, and feedback verification
• Input/output state monitoring and logical flow validation for subsystems

Engine Management and Cooling Systems

• Engine load simulation, injector performance, and rail pressure evaluation
• Thermal regulation system tests for cooling fans, thermostats, and temperature sensors
• Air management diagnostics including turbocharger boost and EGR validation

Powertrain and Transmission Systems

• Transmission clutch pack engagement testing and shift solenoid diagnostics
• Differential lock logic testing and speed sensor signal analysis
• Transmission pressure testing and adaptive calibration routines

Hydraulic System Control

• Closed-center hydraulic architecture validation and pressure-flow mapping
• Proportional valve logic testing and joystick signal interpretation
• Blade articulation system diagnostics and SCV electronic alignment

Electrical Architecture and Monitoring

• High-level wiring diagrams, multi-module harness routing, and fuse/circuit integrity validation
• Monitor ECU configuration, warning logic verification and system parameter access
• BCU diagnostics, logic tree analysis and connector-level voltage verification

HVAC and Climate Regulation Systems

• Refrigerant pressure diagnostics, compressor clutch operation and leak detection
• Cabin airflow mapping, HVAC control logic and blend door calibration
• Temperature regulation verification for defrost, cooling, and heating functions

For complete service information, also see:

870G, 870GP, 872G, and 872GP Motor Grader Repair .......... TM12145
JDLink (MTG) Technical Manual .......... TM114519
TeamMate II 1200, 1400, and 1600 Series Inboard Planetary Axles .......... CTM43
DF230 Series Transmission .......... CTM362
TeamMate II 1400 Series Inboard Planetary Axles .......... CTM138619
120 Series Hydraulic Cylinders .......... CTM120519
120 Series Hydraulic Cylinders .......... CTM114319
6090 PowerTech Diesel Engine (Interim Tier 4) — Level 21 ECU .......... CTM104819
JDLink / ZXLink Machine Monitoring System .......... CTM10006

This John Deere 870G, 870GP, 872G and 872GP Motor Grader Diagnostic and Test Manual is the essential tool for professional technicians handling advanced grader diagnostics, calibration and fault recovery with precision and confidence.