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- John Deere 644H MH vs. John Deere 644K Z-Bar
John Deere 644H MH vs. John Deere 644K Z-Bar
15 reasons to buy John Deere 644H MH:
Sizes
Clearance | 473 mm and 408 mm | 14 % more or 65 mm |
Shovel
Unloading ground clearance at maximum lifting | 2962 mm and 2860 mm | 3 % more or 102 mm |
Bucket capacity with top | 3.4 m3 and 3.2 m3 | 6 % more or 0.2 m3 |
Brimmed bucket capacity | 2.9 m3 and 2.8 m3 | 3 % more or 0.1 m3 |
Operation
Rear axle / differential fluid volume | 27 l. and 22 l. | 19 % more or 5 l. |
Turn radius | 5500 mm and 5570 mm | 1 % less or 70 mm |
Hydraulic system fluid volume | 117 l. and 110 l. | 6 % more or 7 l. |
Engine oil volume | 25 l. and 24.5 l. | 2 % more or 0.5 l. |
Transmission fluid volume | 26 l. and 23 l. | 12 % more or 3 l. |
Front axle / differential fluid volume | 27 l. and 22 l. | 19 % more or 5 l. |
Motor
Power measured at | 2200 rev / min and 1700 rev / min | 23 % more or 500 rev |
Displacement | 8.1 l. and 6.8 l. | 16 % more or 1.3 l. |
Hydraulic system
Unloading time | 1.2 sec and 1.4 sec | 14 % less or 0.2 sec |
Gear box
Maximum forward speed | 39 km/h and 36.6 km/h | 6 % more or 2.4 km/h |
Maximum reverse gear | 26.7 km/h and 24.9 km/h | 7 % more or 1.8 km/h |
12 reasons to buy John Deere 644K Z-Bar:
Sizes
Radius at maximum lifting and unloading | 1120 mm and 1055 mm | 6 % more or 65 mm |
Shovel
Breakout power | 150.8 kN and 152.8 kN | 1 % less or 2.0 kN |
Operation
Static tipping weight | 15230 kg and 14019 kg | 8 % more or 1211 kg |
Fuel Capacity | 352 l. and 341 l. | 3 % more or 11 l. |
Generator current strength | 80 amperes and 55 amperes | 31 % more or 25 amperes |
Cooling system fluid volume | 29.5 l. and 29 l. | 2 % more or 0.5 l. |
Motor
Maximum torque | 1016 Nm and 1010.1 Nm | 1 % more or 5.9 Nm |
Effective power | 173 kW and 134 kW | 23 % more or 39 kW |
Torque increase | 55 % and 40 % | 27 % more or 15 % |
Torque measured at | 1400 rev / min and 1300 rev / min | 7 % more or 100 rev |
Hydraulic system
Pump bandwidth | 310 l/min and 280 l/min | 10 % more or 30 l/min |
Lifting time | 5.5 sec and 6 sec | 8 % less or 0.5 sec |
Neutral reasons:
Sizes
Between tyres width | 2874 mm and 2875 mm |
Height to cab upper part | 3412 mm and 3380 mm |
Wheelbase | 3200 mm and 3260 mm |
Hinge axis maximum height | 4156 mm and 4070 mm |
Length with bucket on ground level | 7815 mm and 8140 mm |
Shovel
Shovel width | 3040 mm and 3040 mm |
Operation
Tyre size | 23.5-25 and 23.5 R25 |
Working weight | 17657 kg and 18160 kg |
Operating voltage | 24 V and 24 V |
Rear axle oscillating | 26 degrees and 26 degrees |
Motor
Aspiration | Turbocharging with subsequent air cooling (by a cooling radiator) and Turbocharger with charge air cooler by oncoming air flow |
Cylinders number | 6 and 6 |
Manufacturer | John Deere and John Deere |
Model | 6081H and 6068H, III Level III certified |
Hydraulic system
Lowering time | 3 sec and 3 sec |
Type of pump | piston pump and variable displacement axial piston pump |
Overflow valve pressure | 24850 kPa and 25165.8 kPa |
Gear box
Transmission type | powershift and Powershift transmission of intermediate type |
Forward gears number | 4 and 4 |
Reverse gears number | 3 and 3 |
Images
Sizes
1. Length with bucket on ground level | 7815 mm | 1. Length with bucket on ground level | 8140 mm |
2. Between tyres width | 2874 mm | 2. Between tyres width | 2875 mm |
3. Height to cab upper part | 3412 mm | 3. Height to cab upper part | 3380 mm |
4. Wheelbase | 3200 mm | 4. Wheelbase | 3260 mm |
5. Clearance | 473 mm | 5. Clearance | 408 mm |
6. Hinge axis maximum height | 4156 mm | 6. Hinge axis maximum height | 4070 mm |
8. Radius at maximum lifting and unloading | 1055 mm | 8. Radius at maximum lifting and unloading | 1120 mm |
Shovel
7. Unloading ground clearance at maximum lifting | 2962 mm | 7. Unloading ground clearance at maximum lifting | 2860 mm |