John Deere 120C Excavator Repair Technical Manual

Table of Contents
Technical Repair Manual – TM1935
Section 00—General Information
Group 0001—Safety
Group 0003—Torque Values
Section 01—Tracks
Group 0130—Track System
Section 02—Axles and Suspension Systems
Group 0250—Axle Shaft, Bearings, and Reduction Gears
Group 0260—Hydraulic System
Section 04—Engine
Group 0400—Removal and Installation
Section 05—Engine Auxiliary Systems
Group 0510—Cooling System
Group 0520—Intake System
Group 0560—External Fuel Supply Systems
Section 07—Dampener Drive (Flex Coupling)
Group 0752—Elements
Section 17—Frame or Supporting Structure
Group 1740—Frame Installation
Group 1749—Chassis Weights
Section 18—Operator’s Station
Group 1800—Removal and Installation
Group 1810—Operator Enclosure
Group 1821—Seat and Seat Belt
Group 1830—Heating and Air Conditioning
Section 32—Bulldozers (Backfill Blade)
Group 3201—Blades
Group 3260—Hydraulic System
Section 33—Excavator
Group 3302—Buckets
Group 3340—Frames
Group 3360—Hydraulic System
Section 43—Swing or Pivoting System
Group 4350—Mechanical Drive Elements
Group 4360—Hydraulic System
Section 99—Dealer Fabricated Tools
Group 9900—Dealer Fabricated Tools
Operation and Test Manual – TM1934
Section 9000—General Information
Group 01—Safety
Section 9005—Operational Checkout Procedure
Group 10—Operational Checkout Procedure
Section 9010—Engine
Group 05—Theory of Operation
Group 15—Diagnostic Information
Group 25—Tests
Section 9015—Electrical System
Group 05—System Information
Group 10—System Diagrams
Group 15—Sub-System Diagnostics
Group 20—References
Section 9020—Power Train
Group 05—Theory of Operation
Group 15—Diagnostic Information
Section 9025—Hydraulic System
Group 05—Theory of Operation
Group 15—Diagnostic Information
Group 25—Tests
Section 9031—Heating and Air Conditioning
Group 05—Theory Of Operation
Group 15—Diagnostic Information
Group 25—Tests
Section 9900—Dealer Fabricated Tools
Group 99—Dealer Fabricated Tools
Read the safety messages in the introduction of this manual and the cautions presented throughout the text of the manual.
These are divided in two parts: repair and operation and tests. Repair sections tell how to repair the components. Operation and tests sections help you identify the majority of routine failures quickly.
Information is organized in groups for the various components requiring service instruction. At the beginning of each group are summary listings of all applicable essential tools, service equipment and tools, other materials needed to do the job, service parts kits, specifications, wear tolerances, and torque values.
These are concise guides for specific machines. They are on-the-job guides containing only the vital information needed for diagnosis, analysis, testing, and repair.