John Deere 644J 4WD Loader


The 644J Loader is a 4-wheel drive, 4.25-cubic yard unit that can tackle a wide variety of jobs thanks to a variety of configurations, options and John Deere Worksite ProTM 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.


Get Better Productivity

        The John Deere PowerTech PlusTM 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

For extra productivity without extra effort, the Powershift torque-converter transmission employs smart-shift technology to continuously evaluate speed and load conditions, and continuously adjust clutch-pack engagement to suit and ensure the smoothest gear and directional shifts in the industry


        40-degree articulation allows for exceptional maneuverability in the tightest of quarters

        Hydraulic locking differential

Get Better Operator Performance

        Choose from single-lever joystick or two-lever fingertip pilot-operated controls, both featuring John Deeres innovative Quick Shift pushbutton gear change

        Backlit pushbuttons in the sealed touchpad allow fingertip control of numerous functions

        No tool is required to adjust boom height kick-out, return-to-carry, or return-to-dig

        Industry-leading 360-degree visibility gives clear sight lines to the work shead and the worksite around you.

        Eleven automotive-style louvers provide effective airflow to help keep the view clear and the cab comfortable

Get Better Uptime

        Quad Cool places the radiator and transmission, hydraulic and air-to-air coolers in a separate compartment for extra efficiency, easier clean-out and decreased debris buildup

        The electronic system employs highly reliable circuit-board technology and solid-state switches, eliminating numerous wiring harnesses, fuses, relays, and connectors

        Optional reversing fan back-blows every 30 minutes to help keep cores clean

        All daily service points, including fuel, are on the left side for quick and convenient ground-level access

        Extended engine, hydraulic and transmission service intervals contribute to low daily operating costs

        An advanced monitor gives easy-to-understand diagnostic messages with possible solutions to help get back up and running fast without the need to connect to a laptop