John Deere 6020 to 6920S and SE Tractors Diagnostics Technical Manual TM4726

John Deere diagnostics technical manual TM4726 for the 6020 series tractors. That is the 6020, 6120, 6220, 6320, 6420 and 6420S, and also the 6520, 6620, 6820, 6920 and 6920S, plus the SE models.

At almost 1,500 pages, this is the book for electronic fault finding. It is built around diagnostic trouble codes, with test steps for PowrQuad, AutoQuad and IVT transmissions.

Compatibility and quick facts

• Make: John Deere
• Models: 6020, 6120, 6220, 6320, 6420, 6420S, 6520, 6620, 6820, 6920, 6920S, SE tractors
• Book code: TM4726
• Transmissions: PowrQuad, AutoQuad, IVT
• Companion books: Operation and Tests, and Repair manuals for 6020-6620 and 6820-6920S
• Edition: 1 Nov 2003
• Manual type: Technical manual (diagnostics)
• Language: English
• Length: 1496 pages
• Format: PDF, download link right after checkout

What is inside

• Diagnostic trouble codes for every control unit, with step-by-step checks
• Wiring schematics, connectors and harness tests
• Transmission control: PowrQuad, AutoQuad and IVT
• Hitch, PTO and hydraulic electronics
• Cab heater and air conditioning circuits
• AutoTrac and GreenStar related circuits

Good to know before you buy

John Deere technical manuals are written for a trained mechanic. Each group opens with the special tools, specs, wear limits and torque values, then the steps.

The file name on the store lists only the 6020 to 6420S, but the book covers the whole 6020 range up to the 6920S.

This is the diagnostics book only. Repair steps are in the separate repair manuals.

Common questions

Does it cover the IVT transmission codes?
Yes, the IVT, AutoQuad and PowrQuad are all covered.

Is my 6420 SE covered?
Yes. The SE tractors are included.