John Deere 444J, 544J, 624J Operation and Test Manual (TM2135)
John Deere Models Covered & Key Technical Specifications
Models: John Deere 444J, John Deere 544J, John Deere 624J
Model Year: 2004
Serial Numbers: 590068 and later
Technical Data:
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Hydraulic oil temperature: 44—56 °C (110—130°F)
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Engine fast idle speed: 2325—2375 rpm
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444J (Z-Bar) boom raise cycle time: 5.8 seconds
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544J (Z-Bar) boom raise cycle time: 6.0 seconds
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624J (Z-Bar) boom raise cycle time: 6.4 seconds
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444J (Z-Bar) boom lower (float) cycle time: 3.0 seconds
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Steering (stop to stop) cycle time: 2.7 seconds
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Air intake system pressure: 13.8—20.7 kPa (0.13—0.21 bar, 2—3 psi)
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Engine cooling system pressure (cap relief): 103 kPa (1 bar, 15 psi)
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444J/544J turbocharger boost pressure: 62—83 kPa (0.62—0.83 bar, 9—12 psi)
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624J turbocharger boost pressure: 83—103 kPa (0.83—1.03 bar, 12—15 psi)
John Deere Manual Features & Content Preview
John Deere 444J, 544J, 624J Loader Technical Manual
- Details 444J, 544J, and 624J J-Series loaders, featuring operational, testing, and system specifications for heavy equipment technicians
- Original OEM publication TM2135, released January 8, 2004
- Features over 170 component-location listings, electrical schematics, and cycle-time tables for engine and hydraulic performance testing
- Contains 630 pages of factory diagnostic procedures and electrical integration data
Operational and Testing Documentation
This technical manual reviews the operational checkout procedures required for daily maintenance and diagnostic troubleshooting on J-Series loaders. It outlines the testing parameters for electrical systems, hydraulic controls, and transmission performance. The documentation guides users through both engine-off and engine-running checks to verify factory-standard operation. The manual also outlines essential safety protocols for handling high-pressure fluid systems, executing welding repairs, and operating heavy equipment. Working with heavy machinery involves inherent risks; relying strictly on the original John Deere procedures is critical to safely verify mechanical reliability and avoid structural failures during shop work.
Engine and Electrical Reference Values
The TM2135 publication documents essential mechanical and electrical specifications, including boost pressure ratings, cycle timing, and fuse configurations. For example, the test data specifies a hydraulic oil temperature of 44—56 °C (110—130°F) during cycle time tests and an engine fast idle speed of 2325—2375 rpm across all models. The pressure test tables list the 624J turbocharger boost pressure at 83—103 kPa (0.83—1.03 bar, 12—15 psi). For more context on the scope of these documents, review what an OEM service publication covers. Note that all service data provided here is for general review; qualified technicians should always consult the complete original OEM documentation for actual hands-on diagnostics.
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