John Deere 644H, 644H MH Loader Operation and Test Technical Manual TM1637

John Deere operation and test technical manual for the 644H wheel loader and the 644H MH material handler, dated 15 January 2004.

This is the book you use to find the fault before pulling parts. It explains how each system works, gives the diagnostic trouble codes, and walks through electrical, transmission, hydraulic, steering and brake tests. The engine is the John Deere 8.1 L. Repair procedures are in the separate TM1638.

What the manual covers

• Diagnostic trouble codes and how to clear them
• Electrical theory, schematics, component location and testing
• Engine and fuel system checks
• Transmission operation and pressure tests
• Hydraulic system operation, pressure and flow tests
• Steering and brake tests
• Air conditioning and heating tests

Models covered

644H and 644H MH loaders, John Deere 8.1 L engine. Changes marked at serials such as 571786, 574051 and 585561.

Before you order

• Check the fit. Confirm the model plate reads 644H or 644H MH. For disassembly and repair, get TM1638 as well.
• Manual type. Technical manual (operation and tests). Written for a trained mechanic. Each section opens with the specs, torque values, wear limits and special tools you need before the steps.
• Format. PDF download, 392 pages, English. Link right after checkout. No printed copy is posted.

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