vs.

      John Deere 644J Z-Bar vs. Case 621EXR

      17 reasons to buy John Deere 644J Z-Bar:

      Sizes

      Radius at maximum lifting and unloading 1120 mm and 1029 mm 8 % more or 91 mm
      Clearance 434 mm and 370 mm 15 % more or 64 mm

      Shovel

      Bucket capacity with top 3.2 m3 and 2.3 m3 28 % more or 0.9 m3
      Brimmed bucket capacity 2.8 m3 and 2 m3 29 % more or 0.8 m3

      Operation

      Engine oil volume 24.5 l. and 13.2 l. 46 % more or 11.3 l.
      Transmission fluid volume 26.5 l. and 18.9 l. 29 % more or 7.6 l.
      Generator current strength 80 amperes and 65 amperes 19 % more or 15 amperes
      Fuel Capacity 352 l. and 246 l. 30 % more or 106 l.

      Motor

      Effective power 138 kW and 109 kW 21 % more or 29 kW
      Power measured at 2200 rev / min and 1800 rev / min 18 % more or 400 rev
      Displacement 6.8 l. and 6.7 l. 1 % more or 0.1 l.
      Torque measured at 1400 rev / min and 1300 rev / min 7 % more or 100 rev
      Maximum torque 1016 Nm and 689 Nm 32 % more or 327 Nm
      Torque increase 55 % and 33 % 40 % more or 22 %

      Hydraulic system

      Lowering time 3 sec and 4.7 sec 36 % less or 1.7 sec
      Pump bandwidth 257 l/min and 171 l/min 33 % more or 86 l/min
      Lifting time 6.2 sec and 6.3 sec 2 % less or 0.1 sec

      7 reasons to buy Case 621EXR:

      Shovel

      Unloading ground clearance at maximum lifting 3214 mm and 2950 mm 8 % more or 264 mm
      Breakout power 106.4 kN and 153 kN 30 % less or 46.6 kN

      Operation

      Cooling system fluid volume 36 l. and 29.5 l. 18 % more or 6.5 l.
      Turn radius 5245 mm and 5490 mm 4 % less or 245 mm
      Hydraulic system fluid volume 147.6 l. and 117 l. 21 % more or 30.6 l.

      Hydraulic system

      Unloading time 1.3 sec and 1.4 sec 7 % less or 0.1 sec

      Gear box

      Maximum forward speed 38.6 km/h and 35.4 km/h 8 % more or 3.2 km/h

      Neutral reasons:

      Sizes

      Wheelbase 3200 mm and 2900 mm
      Hinge axis maximum height 4140 mm and 4243 mm
      Length with bucket on ground level 8050 mm and 7792 mm
      Between tyres width 2875 mm and 2523 mm
      Height to cab upper part 3400 mm and 3395 mm

      Shovel

      Shovel width 2895.6 mm and 2602 mm

      Operation

      Rear axle / differential fluid volume 22 l. and 22 l.
      Operating voltage 24 V and 24 V
      Front axle / differential fluid volume 22 l. and 22 l.
      Rear axle oscillating 26 degrees and 24 degrees
      Tyre size 23.5 R25 and 20.5 R25
      Working weight 18212 kg and 12521 kg

      Motor

      Manufacturer John Deere and Case
      Model 6068H and Family IV, 667TA/EDB, III Level III certified
      Cylinders number 6 and 6
      Aspiration Turbocharger with charge air cooler by oncoming air flow and Turbocharging with subsequent air cooling (by a cooling radiator)

      Hydraulic system

      Type of pump variable displacement axial piston pump and in the middle position with locking with pressure / flow compensation
      Overflow valve pressure 24800 kPa and 24822 kPa

      Gear box

      Transmission type automatic powershift and 4 forward / 3 reverse gears proportional with electronic control module
      Forward gears number 4 and 4
      Reverse gears number 3 and 3
      Maximum reverse gear 25 km/h and 25 km/h

      Images

      Sizes

      2. Between tyres width 2875 mm 2. Between tyres width 2523 mm
      3. Height to cab upper part 3400 mm 3. Height to cab upper part 3395 mm
      4. Wheelbase 3200 mm 4. Wheelbase 2900 mm
      5. Clearance 434 mm 5. Clearance 370 mm
      6. Hinge axis maximum height 4140 mm 6. Hinge axis maximum height 4243 mm
      8. Radius at maximum lifting and unloading 1120 mm 8. Radius at maximum lifting and unloading 1029 mm
      1. Length with bucket on ground level 8050 mm 1. Length with bucket on ground level 7792 mm

      Shovel

      7. Unloading ground clearance at maximum lifting 2950 mm 7. Unloading ground clearance at maximum lifting 3214 mm