John Deere 6120 6220 6320 6420 and 6120L 6220L 6320L 6420L 6520L Tractors Repair Technical Manual TM4647

What's Covered in This Manual

This is the official John Deere TM4647 Repair Technical Manual covering the 6120, 6220, 6320, and 6420 standard-frame tractors along with the long-wheelbase 6120L, 6220L, 6320L, 6420L, and 6520L models. The manual is written for an experienced technician and is organized the way John Deere shops actually use it: safety first, then specifications and serial number locations, followed by the engine, transmission, hydraulics, electrical system, steering, and final drive sections, each broken into its own numbered group so a tech can jump straight to the procedure needed without hunting through unrelated chapters.

Inside you'll find the complete removal, disassembly, inspection, and reassembly steps for the engine and driveline, along with the torque specifications, wear tolerances, and special tool callouts that keep a repair within factory spec the first time. Electrical sections include wiring and component locations for troubleshooting charging, starting, and instrument circuits, while the hydraulics and steering groups cover pump, valve, and cylinder service for both two-wheel and front-wheel-drive configurations. Serial number and PIN location references for the tractor, engine, transmission, front-wheel-drive axle, cab, and seat are included so the right parts and procedures get matched to the right machine.

This manual cross-references three companion John Deere publications for a complete service picture: TM4646 covers Operation and Tests, TM4733 covers Diagnostics, and component-level manuals including CTM104 (POWERTECH Diesel Engines), CTM207 and CTM170 (fuel injection systems), and CTM77 (Alternators and Starting Motors) are referenced for deeper component work. Whether you're doing routine maintenance, a mid-level repair, or a full engine rebuild on one of these tractors, this is the same manual the dealership technician would pull off the shelf.

Table of Contents

• Section 10 - Safety - general and machine-specific safety information
• Section 20 - Specifications, lubricants, and serial number locations
• Section 30 - Engine - Diesel - specifications, diagnostics, repair
• Section 40 - Electrical - component locations, schematics, diagnostics
• Section 60 - Power Train - Transmission - repair and adjustments
• Section 70 - Front-Wheel Drive Axles - AS/MS and 700 Series
• Section 80 - Hydraulics - specifications, schematics, repair
• Section 90 - Steering - diagnostics, tests, adjustments, repair