1. The JOHN DEERE 644J (SN.-611231) and 724J (SN.-611218) 4WD Loaders are reliable and powerful machines designed to tackle heavy-duty tasks with ease. With their robust construction and advanced features, these loaders are built to withstand demanding work environments. The TM2075 Free Online Manual provides comprehensive guidance on operating and maintaining these loaders, ensuring optimal performance and longevity. Whether you need to move large quantities of material or handle various attachments, the JOHN DEERE 644J and 724J loaders are the perfect choice for efficient and productive operations.