John Deere 120C Excavator Operation and Test Manual (TM1934)

John Deere 120C Excavator Operation and Test Manual (TM1934 01DEC15)

This official technical manual provides in-depth diagnostic, operational, and testing procedures for the John Deere 120C Excavator. It includes troubleshooting for hydraulic, electrical, and engine systems, along with system performance evaluations, diagnostic trouble codes, and testing procedures to ensure maximum efficiency.

File Format: PDF

Size: 30.74 MB

No. of pages: 446

Language: English

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

📑 Table of Contents Overview:

General Information & Safety

• Recognizing safety information
• Handling chemical products safely
• Preventing unintended machine movement
• Cab guarding for special uses
• Inspecting machine components

Operational Checkout Procedures

• Engine start-up and operational tests
• Monitor and gauge circuit checks
• Propel system tracking and maneuverability test
• Cycle time testing
• Control valve and hydraulic function tests

Engine Diagnostics

• Engine speed control system operation
• Fuel line leakage test
• Engine power test using turbocharger boost pressure

Electrical System

• Wiring schematics and fuse locations
• Battery, alternator, and starter motor diagnostics
• CAN communication circuit troubleshooting
• Solenoid, sensor, and relay testing

Power Train

• Track adjuster and recoil spring operation
• Propel gearbox maintenance and testing
• Swing bearing wear measurement

Hydraulic System

• Hydraulic pump and control valve operation
• Pilot pressure regulation and flow adjustment
• Swing motor brake and circuit drift testing
• Propel motor leakage test

Heating & Air Conditioning System

• Cab air circulation and blower motor troubleshooting
• Air conditioning compressor and refrigerant testing
• Air filter maintenance and heating system diagnostics

This John Deere 120C Excavator Operation and Test Manual is an essential resource for technicians, mechanics, and equipment operators, providing comprehensive diagnostics, troubleshooting, and system testing procedures for maintaining peak excavator performance.