DEERE 644K Hybrid Wheel Loader Wheel Loaders

Engine

Our FT4/Stage IV diesels delivers generous displacement, power, and lugging ability.

Ash-service intervals for the diesel particulate filter (DPF) are condition based, so changing it may not be necessary until the first engine overhaul. Intervals can be extended further depending on application, regular maintenance practices, and the use of recommended fluids and lubricants.

Quad-Cool™

Quad-Cool places the radiator, air-conditioner condenser, intercooler, and hydraulic, transmission, and optional axle coolers in a unique boxed configuration that's isolated from engine heat.

Optional programmable fan reverses, ejecting debris from radiator and cooler cores.

Transmission and Axles

With ride control, the lift cylinders act as shock absorbers, cushioning bumps to allow these loaders to navigate rough ground more quickly without losing their loads.

Automatic differential lock engages as soon as a tire begins to slip. It's ideal for inexperienced operators or applications requiring high traction, such as stockpiling silage, plowing snow, and handling pipe.

Maintenance

Lockable compartment swings open wide, offering convenient ground-level access to remote-start battery terminals and the electrical-disconnect switch.

Conveniently located, easy-to-read sight gauges and see-through reservoirs let you check transmission, hydraulic, coolant, and windshield washer fluid levels at a glance.

Controls

Choose single-lever joystick or two-lever fingertip pilot-operated hydraulic controls.

Optional joystick steering is ideal for V-pattern truck loading.

Versatility

Equip your loader with optional Z-Bar, High Lift, Tool Carrier, or Parallel Lift linkage

Worksite Pro couplers make attachment switchover easy to get even more out of your machine.

Safety & Security

Sealed-switch module keeps out dust and moisture while eliminating nearly 100 wires. Prevent unauthorized machine operation with keyless-start requiring a numeric pass code.

Optional rearview camera and radar object-detection system

DRIVELINE

Engine Manufacturer	John Deere
Engine Model	PowerTech PSX 6068
Emission Rating	Interim Tier 4
Displacement, ltr (Inches³)	6.8 (414)
Rated Speed, rpm	1700
Engine Output - Net, kW (hp)	171 (229)
Torque, Nm (lbf / ft)	991 (730)
Torque Rise, %	19
Transmission Type	Powershift w/Hybrid-Electric Drive
Front Differential Type	Locking
Rear Differential Type	Open
Tire size - Standard	23.5 R25
Service Brake - Type	Wet Disc
Service Brake - Location	Axle Inboard
Service Brake - Actuation	Hydraulic
Parking Brake - Type	Wet Multi Disc - Transmission

DIMENSIONS

Height - Over Cab, mm (ft/in)	3430 (11 ft 3 in)
Wheelbase, mm (ft/in)	3260 (10 ft 8 in)
Length - Including Bucket, mm (ft/in)	8300 (27 ft 3 in)
Ground clearance, mm (inches)	461 (18.1)
Width Over tires - Std, mm (ft/in)	2875 (9 ft 5 in)
Height - Pivot Pin, mm (ft/in)	4120 (13 ft 6 in)
Reach - At 2130mm 45° Dump, mm (ft/in)	1610 (5 ft 3 in)
Turning Circle - Maximum, mm (ft/in)	13280 (43 ft 7 in)

CAPACITIES

Fuel Tank, ltr (gallons (US))	397 (105)
Hydraulic Tank, ltr (gallons (US))	106 (28)
Axle - Front, ltr (gallons (US))	22 (5.75)
Axle - Rear, ltr (gallons (US))	22 (5.75)
Transmission, ltr (gallons (US))	37.9 (10)
Heaped Capacity, m³ (yd³)	3.2 (4.25)
Bucket Capacity - Smallest, m³ (yd³)	3.1 (4)
Largest bucket capacity, m³ (yd³)	3.2 (4.25)
Breakout - Bucket , kgf (lbf)	15378 (33903)
Ride Control System	Optional
System Voltage, V	24
Alternator Output, Amp	100
Pump Type	Piston
Pump Flow, lt/min (gallons (US) / min)	297 (78)
System Pressure, bar (PSI)	251.66 (3650)

WEIGHTS

Operating Weight, kg (lbs)	18341 (40435)