John Deere 644 G Tier (Gen A – 4WD) Loader Technical Repair Manual (SN LA00001 and up)

Table of Contents
Technical Repair Manual – TM14593X019
Section 00—General Information
Group 0001—Safety
Group 0003—Torque Values
Section 01—Wheels
Group 0110—Powered Wheels and Fastenings
Section 02—Axles and Suspension Systems
Group 0200—Removal and Installation
Group 0225—Input Drive Shafts and U-Joints
Group 0250—Axle Shaft, Bearings, and Reduction Gears
Group 0260—Hydraulic System
Section 03—Transmission
Group 0300—Removal and Installation
Group 0350—Gear, Shafts, and Power Shift Clutches
Group 0351—Gear, Shafts, Bearings and Seals
Group 0360—Hydraulic System
Section 04—Engine
Group 0400—Removal and Installation
Section 05—Engine Auxiliary System
Group 0505—Cold Weather Starting Aids
Group 0510—Cooling System
Group 0520—Intake System
Group 0530—External Exhaust System
Group 0560—External Fuel Supply Systems
Section 09—Steering System
Group 0960—Hydraulic System
Section 10—Service Brakes
Group 1062—Service Brake Valve
Group 1064—Reservoir and Accumulator
Section 11—Park Brake
Group 1111—Active Elements
Group 1163—Park Brake Lines
Section 15—Equipment Attaching
Group 1520—Hitches and Hitch Pins
Section 16—Electrical System
Group 1600—Removal and Installation
Section 17—Frame or Supporting Structure
Group 1740—Frame Installation
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 19—Sheet Metal and Styling
Group 1910—Hood or Engine Enclosure
Group 1921—Grille and Grille Housing
Section 31—Loader
Group 3102—Bucket
Group 3140—Frames
Group 3160—Hydraulic System
Operation and Test Manual – TM14592X019
Section 9000—General Information
Group 01—Safety
Section 9001—Diagnostic Trouble Codes (DTCs)
Group 10—Engine Control Unit (ECU) Diagnostic Trouble Codes—L Engine
Group 20—Transmission Control 1 (TC1) Diagnostic Trouble Codes
Group 30—Vehicle Control Unit (VCU) Diagnostic Trouble Codes
Group 40—Vehicle Control Unit 2 (VC2) Diagnostic Trouble Codes
Group 50—Switch Module 1 (SM1) Diagnostic Trouble Codes
Group 60—Primary Display Unit (PDU) Diagnostic Trouble Codes
Section 9005—Operational Checkout Procedure
Group 10—Operational Checkout Procedure
Section 9010—Engine
Group 05—Theory of Operation
Group 10—System Diagrams
Group 15—Diagnostic Information
Group 20—Adjustments
Group 25—Tests
Section 9015—Electrical System
Group 05—Theory of Operation
Group 10—System Diagrams
Group 15—Diagnostic Information
Group 16—Monitor Operation
Group 17—Diagnostic Test Box
Group 20—Adjustments
Group 25—Tests
Section 9020—Power Train
Group 05—Theory of Operation
Group 10—System Diagrams
Group 15—Diagnostic Information
Group 20—Adjustments
Group 25—Tests
Section 9025—Hydraulic System
Group 05—Theory of Operation
Group 10—System Diagrams
Group 15—Diagnostic Information
Group 20—Adjustments
Group 25—Tests
Section 9031—Heating and Air Conditioning
Group 05—Theory of Operation
Group 10—System Diagrams
Group 15—Diagnostic Information
Group 25—Tests
The Technical manuals 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. Technical Manuals are concise guides for specific machines. They are on-the-job guides containing only the vital information needed for diagnosis, analysis, testing and repair.