2008 John Deere Construction 644J Z Bar
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Productivity
An impressive torque reserve of 55% provides extra power when you need it.

When rpms drop below 2200, horsepower actually goes up. The John Deere Power Bulge advantage helps maintain good boom and bucket speed into the pile. For quicker and easier bucket fill.

You won't find a smoother shifting loader. The powershift torque-converter transmission employs smart-shift technology to continuously evaluate speed and load conditions, and adjusts clutch-pack engagement to suite. For extra productivity without extra effort.

Comfort
Choose from single-lever joystick or two lever fingertip pilot operated controls. Both include John Deere's innovative Quick Shift feature that allows pushbutton gear changes.

Backlit pushbuttons in the sealed touchpad allow fingertip control of numerous functions. No tools required to adjust boom height kick-out, return-to-carry, or return-to-dig.

Standard air-ride sear adjusts multiple ways for extra comfort. All-around visibility is unobstructed and 11 automotive-style louvers provide effective airflow to help keep the view clear, the cab comfortable.

Uptime / Service
Quad Cool™ places the radiator and transmission, hydraulic, and air-to-air coolers in a separate compartment for extra efficiency and decreased debris buildup. 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.

If something goes wrong, and advanced monitor gives easy-to-understand diagnostic messages and even offers possible solutions to help get you back up and running quickly.

 GENERAL INFORMATION
 Insurance  Get an Insurance Quote
 Manufacturer  John Deere Construction
 Model Year  2008
 Model  644J Z Bar
 MSRP  Request a Quote
 DIMENSIONS
 Length Overall  27 ft. 1 in.
 Height  11 ft. 2 in. (3.40 m)
 Weight  41,310 lbs. (18,738 kg)
 Wheelbase  10 ft. 6 in. (3.20 m)
 Ground Clearance  18.1 in. (460 mm)
 Turning Radius  18 ft. (5,486 mm)
 Fuel Tank Capacity  93 gal. (352 l)
 Hydraulic Tank Capacity  31 gal. (117.3 l)
 DRIVETRAIN
 Transmission Make  Countershaft-type PowerShift™
 Number of Speeds  4 forward / 3 reverse
 Tire Size  23.5 R 25
 Axles  Heavy-duty mid-board planetary
 ENGINE
 Engine Make  John Deere PowerTech Plus™
 Engine Model  6068H
 Fuel Type  Diesel
 Cylinders  6
 Displacement  414 ci (6.8 l)
 Net Horsepower  232 hp (173 kW)
 Torque  749 ft. lbs. (1,016 Nm) @ 1,400 rpm
 Cooling  Hydraulically driven, proportionally controlled, fan aft of coolers
 Rated Speed  1,700 rpm
 Speed Forward  Gear 1: 4.6 mph (7.4 km/h)
Gear 2: 7.6 mph (12.2 km/h)
Gear 3: 14.7 mph (23.7 km/h)
Gear 4: 22 mph (35.4 km/h)
 Speed Reverse  Gear 1: 4.9 mph (7.9 km/h)
Gear 2: 8 mph (12.9 km/h)
Gear 3: 15.5 mph (24.9 km/h)
 BATTERY
 Voltage  24V
 Amps  80A
 HYDRAULICS
 Hydraulic Reserve  Variable-displacement, axial-piston pump; closed-center, pressure-compensating system
 Std Pump Flow  68 gpm (257 lpm)
 OPERATIONAL
 Tipping Load  30,520 - 34,379 lbs. (13,844 - 15,594 kg)
 Bucket Capacity  3.7 - 4.25 cu. yd. (2.8 - 3.2 cu. m)
 Height to Bucket Pin  13 ft. 7 in. (41.4 m)
 Dump Height  9 ft. 8 in. (2.94 m)
 Dump Reach  3 ft. 6 in. - 5 ft. 6 in. (1.07 - 1.67 m)
 Bucket Breakout  34,407 lbs. (15,607 kg)
 Max Dump Angle  45°
 Total Cycle Time  10.6 sec.
 Insurance  Get an Insurance Quote
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*Price, if shown, is Manufacturer's Suggested Retail Price (MSRP) and does not include government fees, taxes, dealer freight/preparation, dealer document preparation charges or any finance charges (if applicable). MSRP and/or final actual sales price will vary depending on options or accessories selected.


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