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The John Deere 644J Loader is a 4-wheel driver, 4.25-cubic yard unit that can tackle a wide variety of jobs thanks to a variety of configurations, options and John Deere Worksite Pro attachments. A Powerllel linkage version provides powerful digging forces and the convenient parallel lift characteristics for applications demanding versatility, while a Z-bar linkage is the choice for pure production. The John Deere PowerTech Plus delivers class leading horsepower to handle the most difficult applications. Exceptional power match between the engine and hydraulics provides excellent boom and bucket power going into the pile. The PowerTech Plus diesel engine delivers an impressive torque rise that tops out at 55 percent. Built-in Power Bulge generates additional horsepower when the rpms drop