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 Deere™s 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
