644 X-Tier Mid-Size Wheel Loader
  • Net Power: 172 kW (231 hp) at 1,500 rpm
  • Operating Weight: 18 856–18 892 kg (41,571–41,649 lb.)
  • Bucket Capacity: 3.1–3.6 m3 (4.0–4.75 cu. yd.)

Features

  • Bucket Capacity: 3.1-3.6 m3; (4.0-4.75 cu. yd.)

  • Operating Weight: 18,856-18,892 kg (41,571-41,649 lb.)

  • Engine Net Power: 172 kW (231 hp)

Specifications

CAPACITIES - Alternator Output, Amp:
140
CAPACITIES - Axle - Front, ltr (gallons (US)):
22 (5.75)
CAPACITIES - Axle - Rear, ltr (gallons (US)):
22 (5.7)
CAPACITIES - Breakout - Bucket , kgf (lbf):
15574 (34334)
CAPACITIES - Fuel Tank, ltr (gallons (US)):
350 (92.6)
CAPACITIES - Heaped Capacity, m³ (yd³):
3.2 (4.25)
CAPACITIES - Hydraulic Tank, ltr (gallons (US)):
103.4 (27.3)
CAPACITIES - Largest bucket capacity, m³ (yd³):
3.4 (4.5)
CAPACITIES - Pump Flow - 1, lt/min (gallons (US) / min):
265 (70)
CAPACITIES - Pump Type:
Piston
CAPACITIES - Ride Control System:
Optional
CAPACITIES - Smallest bucket capacity, m³ (yd³):
3.2 (4.25)
CAPACITIES - System Pressure, bar (PSI):
251.66 (3650)
CAPACITIES - System Voltage, V:
24
CAPACITIES - Transmission, ltr (gallons (US)):
32 (8.5)
DIMENSIONS - Ground clearance, mm (inches):
386 (15.2)
DIMENSIONS - Height - Over Cab, mm (ft/in):
3450 (11 ft 4 in)
DIMENSIONS - Height - Pivot Pin, mm (ft/in):
4090 (13 ft 5 in)
DIMENSIONS - Length - Including Bucket, mm (ft/in):
8260 (27 ft 1 in)
DIMENSIONS - Reach - At 2130mm 45° Dump, mm (ft/in):
1610 (5 ft 3 in)
DIMENSIONS - Turning Circle - Maximum, mm (ft/in):
13000 (42 ft 9 in)
DIMENSIONS - Wheelbase, mm (ft/in):
3310 (10 ft 10 in)
DIMENSIONS - Width Over tires - Std, mm (ft/in):
2875 (9 ft 5 in)
DRIVELINE - Displacement, ltr (Inches³):
6.8 (415)
DRIVELINE - Emission Rating:
Tier 4 / Stage V
DRIVELINE - Engine Manufacturer :
John Deere
DRIVELINE - Engine Model:
PowerTech PSS 6068
DRIVELINE - Engine Output - Net, kW (hp):
172 (231)
DRIVELINE - Front Differential Type:
Locking
DRIVELINE - Parking Brake - Type:
Wet Multi Disc
DRIVELINE - Rated Speed, rpm:
1500
DRIVELINE - Rear Differential Type:
Open
DRIVELINE - Service Brake - Actuation:
Hydraulic
DRIVELINE - Service Brake - Location:
All Wheels
DRIVELINE - Service Brake - Type:
Wet Disc
DRIVELINE - Tire size - Standard:
23.5 R25
DRIVELINE - Torque Rise, %:
36
DRIVELINE - Torque, Nm (lbf / ft):
1095 (808)
DRIVELINE - Transmission Type:
Powershift w/Hybrid-Electric Drive
WEIGHTS - Operating Weight, kg (lbs):
18856 (41571)

Buckets & Linkage

  • A wide-ranging selection of enhanced production buckets with integrated spill guards, curved side cutters, and impressive rollback maximizes bucket-fill performance and material retention.
  • Choose from hi-vis and JRB-style couplers to maximize fleet versatility and machine utilization.

EH Controls

  • Seat-mounted hydraulic controls include two programmable multifunction buttons and intuitive electrohydraulic (EH) controls.
  • With the capacity to control up to six functions on the single hydraulic joystick, cycle times and productivity when using hydraulic attachments are improved.

Ground-Level Service

  • All daily service points including fuel are conveniently grouped on the left side of the machine at ground level, for easy access.
  • Hinged doors enable wide-open access to the engine, cooling system, and other components.

Comfortable Cab

  • Spacious cab boasts ample legroom and features ergonomically placed controls, foot pedals, and sealed-switch module.
  • Running wide open at 1,600 rpm, the in-cab noise rating is just 70 dBA.

E-Drive Innovation

  • Innovative E-Drive transmission system delivers premium performance and efficiency. System includes an engine-driven generator plus an inverter to control the electric motor that drives a simplified PowerShift™ transmission.
  • Features

    Features

    • Bucket Capacity: 3.1-3.6 m3; (4.0-4.75 cu. yd.)

    • Operating Weight: 18,856-18,892 kg (41,571-41,649 lb.)

    • Engine Net Power: 172 kW (231 hp)

  • Specifications

    Specifications

    CAPACITIES - Alternator Output, Amp:
    140
    CAPACITIES - Axle - Front, ltr (gallons (US)):
    22 (5.75)
    CAPACITIES - Axle - Rear, ltr (gallons (US)):
    22 (5.7)
    CAPACITIES - Breakout - Bucket , kgf (lbf):
    15574 (34334)
    CAPACITIES - Fuel Tank, ltr (gallons (US)):
    350 (92.6)
    CAPACITIES - Heaped Capacity, m³ (yd³):
    3.2 (4.25)
    CAPACITIES - Hydraulic Tank, ltr (gallons (US)):
    103.4 (27.3)
    CAPACITIES - Largest bucket capacity, m³ (yd³):
    3.4 (4.5)
    CAPACITIES - Pump Flow - 1, lt/min (gallons (US) / min):
    265 (70)
    CAPACITIES - Pump Type:
    Piston
    CAPACITIES - Ride Control System:
    Optional
    CAPACITIES - Smallest bucket capacity, m³ (yd³):
    3.2 (4.25)
    CAPACITIES - System Pressure, bar (PSI):
    251.66 (3650)
    CAPACITIES - System Voltage, V:
    24
    CAPACITIES - Transmission, ltr (gallons (US)):
    32 (8.5)
    DIMENSIONS - Ground clearance, mm (inches):
    386 (15.2)
    DIMENSIONS - Height - Over Cab, mm (ft/in):
    3450 (11 ft 4 in)
    DIMENSIONS - Height - Pivot Pin, mm (ft/in):
    4090 (13 ft 5 in)
    DIMENSIONS - Length - Including Bucket, mm (ft/in):
    8260 (27 ft 1 in)
    DIMENSIONS - Reach - At 2130mm 45° Dump, mm (ft/in):
    1610 (5 ft 3 in)
    DIMENSIONS - Turning Circle - Maximum, mm (ft/in):
    13000 (42 ft 9 in)
    DIMENSIONS - Wheelbase, mm (ft/in):
    3310 (10 ft 10 in)
    DIMENSIONS - Width Over tires - Std, mm (ft/in):
    2875 (9 ft 5 in)
    DRIVELINE - Displacement, ltr (Inches³):
    6.8 (415)
    DRIVELINE - Emission Rating:
    Tier 4 / Stage V
    DRIVELINE - Engine Manufacturer :
    John Deere
    DRIVELINE - Engine Model:
    PowerTech PSS 6068
    DRIVELINE - Engine Output - Net, kW (hp):
    172 (231)
    DRIVELINE - Front Differential Type:
    Locking
    DRIVELINE - Parking Brake - Type:
    Wet Multi Disc
    DRIVELINE - Rated Speed, rpm:
    1500
    DRIVELINE - Rear Differential Type:
    Open
    DRIVELINE - Service Brake - Actuation:
    Hydraulic
    DRIVELINE - Service Brake - Location:
    All Wheels
    DRIVELINE - Service Brake - Type:
    Wet Disc
    DRIVELINE - Tire size - Standard:
    23.5 R25
    DRIVELINE - Torque Rise, %:
    36
    DRIVELINE - Torque, Nm (lbf / ft):
    1095 (808)
    DRIVELINE - Transmission Type:
    Powershift w/Hybrid-Electric Drive
    WEIGHTS - Operating Weight, kg (lbs):
    18856 (41571)
  • Details

    Buckets & Linkage

    • A wide-ranging selection of enhanced production buckets with integrated spill guards, curved side cutters, and impressive rollback maximizes bucket-fill performance and material retention.
    • Choose from hi-vis and JRB-style couplers to maximize fleet versatility and machine utilization.

    EH Controls

    • Seat-mounted hydraulic controls include two programmable multifunction buttons and intuitive electrohydraulic (EH) controls.
    • With the capacity to control up to six functions on the single hydraulic joystick, cycle times and productivity when using hydraulic attachments are improved.

    Ground-Level Service

    • All daily service points including fuel are conveniently grouped on the left side of the machine at ground level, for easy access.
    • Hinged doors enable wide-open access to the engine, cooling system, and other components.

    Comfortable Cab

    • Spacious cab boasts ample legroom and features ergonomically placed controls, foot pedals, and sealed-switch module.
    • Running wide open at 1,600 rpm, the in-cab noise rating is just 70 dBA.

    E-Drive Innovation

    • Innovative E-Drive transmission system delivers premium performance and efficiency. System includes an engine-driven generator plus an inverter to control the electric motor that drives a simplified PowerShift™ transmission.

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