John Deere 120C & 120C LC Excavator Repair Technical Manual 2002-2005

Covers 120C and 120C LC Hydraulic/Construction Excavator models from 2002-2005, detailing engine, hydraulic, and electrical systems with part numbers and diagrams. Ref: TM1935

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Document Details

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Document Number / Seller:
29424 / Dennis Wilson
File Size:
64.12 MB
File Type:
PDF
Language:
English (some of our manuals are multi-language)
Pages:
490
Printable:
Yes
Estimated Download Time:
1.31 Minutes
Delivery Format:
Digital (PDF) - Instant Access
Category:
Excavator
Brand:
John Deere
Reviewed and Approved:
Dec 27, 2025
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Models Covered & Key Technical Specifications

Comprehensive Technical Wiring Manual: Excavator John Deere 120C & 120C LC Excavator Repair Technical Manual 2002-2005 OEM-Documentation

Service-Level: John Deere 120C & 120C LC Excavator Repair Technical Manual 2002-2005 // Coverage-Scope: Excavator / Hydraulic Excavator Logic // Operational-Framework: Diagrams, specifications, and procedures.

Component Baseline Architecture
Engine System Critical Function Overall Operation
Hydraulic System Performance Metrics Component Integration
Electrical System Diagnostic Flow Control Schematics
Undercarriage Structural Integrity Load Bearing Capacity
Operator's Station Ergonomic Design System Interface
Drivetrain Power Transfer Torque Specifications

Cataloging major assemblies into: Documented Twist Specifications: 300 N m is set to yield the primary torque for the track roller Assembly Sequences. Calibrated Capacity Limits: For optimal operation, 12000 kg defines the maximum operational weight Baseline. Authorized Measurement Bounds: The final fuel filter requires 4.5 N m for standard operation Requirements. Core Rated Data: The main hydraulic pump specifies 95 kg defines the component weight Threshold. Rated Environmental Range: The engine requires 26.5 L capacity for its cooling system Mapping. Principal Moment Values: For engine repair, 530 kg signifies the heavy component Weight Configuration.

Professional Workshop Service Manual & Technical Specifications

Comprehensive Technical Wiring Manual: Excavator John Deere 120C & 120C LC Excavator Repair Technical Manual 2002-2005 OEM-Documentation

Service-Level: John Deere 120C & 120C LC Excavator Repair Technical Manual 2002-2005 // Coverage-Scope: Excavator / Hydraulic Excavator Logic // Operational-Framework: Diagrams, specifications, and procedures.

Component Baseline Architecture
Engine System Critical Function Overall Operation
Hydraulic System Performance Metrics Component Integration
Electrical System Diagnostic Flow Control Schematics
Undercarriage Structural Integrity Load Bearing Capacity
Operator's Station Ergonomic Design System Interface
Drivetrain Power Transfer Torque Specifications

Cataloging major assemblies into: Documented Twist Specifications: 300 N m is set to yield the primary torque for the track roller Assembly Sequences. Calibrated Capacity Limits: For optimal operation, 12000 kg defines the maximum operational weight Baseline. Authorized Measurement Bounds: The final fuel filter requires 4.5 N m for standard operation Requirements. Core Rated Data: The main hydraulic pump specifies 95 kg defines the component weight Threshold. Rated Environmental Range: The engine requires 26.5 L capacity for its cooling system Mapping. Principal Moment Values: For engine repair, 530 kg signifies the heavy component Weight Configuration.

Engine Repair

Appropriately requiring...

Hydraulic System Repair

Undercarriage Repair

Electrical System Repair

Drivetrain Repair

This manual documents torque specifications for fasteners to ensure proper fastener fatigue prevention.

FAQ

Calculate the **precise** pressure specifications for the air intake system leakage test. keyboard_arrow_down

14–21 kPa (0.14–0.21 bar) (2–3 psi) is the specified pressure range for the air intake system leakage test, ensuring proper sealing.

What values represent the **proper** assembly sequence for the track roller components? keyboard_arrow_down

300 N·m (225 lb-ft) is the torque value specified for the Roller-to-Frame Cap Screw during track roller assembly.

Assess the **standard** service interval parameters for the fuel system. keyboard_arrow_down

250 L (66 gal) is the approximate capacity of the fuel tank that requires draining before servicing the fuel system.

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Reviews (4)

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Rated 5 out of 5 stars
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This manual has been a lifesaver for our technicians! The detailed diagrams and troubleshooting tips are top-notch.
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I found the repair procedures to be clear and easy to follow. The download was seamless and customer support was very responsive!
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The support team was quick to assist with my queries. The manual covers everything I need to keep my excavator running smoothly.