Technical Workshop Guide: John Deere Excavator 120d Diagnostic, Operation And Test Manual
Need to fix your equipment? This professional service guide is the official resource for expert mechanics. It includes specific electrical wiring diagrams and hydraulic troubleshooting steps tailored for this specific model.
This technical documentation for the Brand series provides OEM specifications, torque settings, and assembly instructions.
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What's inside this Brand manual?
- Engine Overhaul
- Transmission Specs
- Hydraulic Schematics
- Electrical Diagrams
- Diagnostic Codes
- Maintenance Intervals
John Deere Excavator 120d Diagnostic, Operation And Test Manual
John Deere 120d Excavator Repair Manual
(tm10736)
Operation And Test Technical Manual John Deere Excavator 120d Diagnostic
✅ General Manual Overview
The John Deere Excavator 120D Diagnostic, Operation and Test Manual is a comprehensive factory-level technical reference designed for technicians and service professionals. It provides structured diagnostic logic, operational theory, and test procedures to ensure accurate fault isolation and safe machine servicing across all major systems.
✅ Engine System Diagnostics
This section covers engine operational theory, fuel delivery systems, air intake and exhaust flow, cooling system performance, and electronic engine controls. It includes sensor testing procedures, ECU communication checks, and engine protection strategies under load and idle conditions.
✅ Hydraulic System Testing
Detailed coverage of main pumps, control valves, pilot circuits, cylinders, and hydraulic motors. Flow testing, pressure validation, relief valve adjustment, and contamination control procedures are clearly outlined for precise troubleshooting.
✅ Electrical and Electronic Systems
Includes complete machine wiring logic, controller inputs and outputs, CAN communication diagnostics, fault code interpretation, and step-by-step electrical testing using multimeters and diagnostic tools.
✅ Travel, Swing, and Implement Functions
Focuses on transmission drive circuits, swing system operation, braking logic, and implement response testing to verify performance and safety compliance.
✅ Maintenance Specifications and Test Charts
Provides technical specifications, operational limits, calibration values, inspection intervals, and diagnostic reference charts essential for preventive maintenance and accurate system evaluation.