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John Deere 644 P-Tier

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Features

Vision and Detection Systems

Interior view of a heavy construction vehicle cab showing an operator seated at the controls, wearing a hard hat and a high-visibility safety vest

Active jobsites present many operational challenges, including multiple machines, crew members, and bystanders. The John Deere Advanced Vision System (AVS) and SmartDetect™ can help enhance operator awareness to confidently navigate busy work areas.

Electrohydraulic (EH) Controls

Interior view of wheel loader cab showing a steering wheel and a control joystick with orange buttons mounted on a black base

Electrohydraulic (EH) controls provide enhanced functionality, allowing operators to customize machine operations. This includes soft hydraulic stops and programmable joystick buttons. These features empower operators with increased productivity across various jobsite tasks.

Payload Weighing Systems

644 P-Tier wheel loader with a raised bucket full of gravel or dirt, parked on a dry, dusty construction site.

SmartWeigh delivers dynamic weighing without slowing down the job—no workflow interruption or boom reset needed. Easily viewed on the onboard monitor and integrated with the John Deere Operations Center, it’s available as a factory or field‑installed option.

Specifications

Engine

ManufacturerJohn Deere
ModelPowerTech™ PSS 6068
Non-Road Emission StandardsEPA Final Tier 4/EU Stage V
Cylinders6
Valves Per Cylinder4
Displacement 6.8 L
Displacement 415 cu in.
Net Peak Power At Rated RPM (ISO 9249)186 kW
Net Peak Power At Rated RPM (ISO 9249)249 hp
Gross Peak Power At Rated RPM (ISO 9249)194 kW
Gross Peak Power At Rated RPM (ISO 9249)260 hp
Net Peak Torque At Rated RPM (ISO 9249)1062 Nm
Net Peak Torque At Rated RPM (ISO 9249)783 lb-ft
Gross Peak Torque At Rated RPM (ISO 9249)1100 Nm
Gross Peak Torque At Rated RPM (ISO 9249)811 lb-ft
Net Torque Rise58 %
Fuel System (Electronically Controlled)High-pressure common rail
LubricationFull-flow spin-on filter and integral cooler
AspirationSeries turbocharged, charge air cooled
Air CleanerUnder-hood, dual-element dry type, restriction indicator in cab monitor for service

Transmission System

TypeCountershaft-type PowerShift™
Torque ConverterSingle stage, single phase
Shift ControlElectronically modulated, adaptive, load and speed dependent
Operator InterfaceSteering-column or joystick-mounted F-N-R and gear-select lever; Quick-Shift button on hydraulic lever
Shift ModesManual/auto (1st–D or 2nd–D); Quick-Shift button with two selectable modes: kick-down or kick-up/down; and four clutch cutoff settings

Serviceability

Fuel Tank (With Lockable Cap) Refill Capacity350.5 L
Fuel Tank (With Lockable Cap) Refill Capacity92.6 gal.
Cooling System Refill Capacity44.5 L
Cooling System Refill Capacity47 qt
Diesel-Exhaust Fluid (DEF) Refill Capacity18.5 L
Diesel-Exhaust Fluid (DEF) Refill Capacity19.5 qt
Engine Oil With Vertical Spin-On Filter Refill Capacity27 L
Engine Oil With Vertical Spin-On Filter Refill Capacity28.5 qt
Transmission Reservoir With Vertical Filter Refill Capacity22.7 L
Transmission Reservoir With Vertical Filter Refill Capacity6 gal.
Axle Oil Without Coolers (Front And Rear, Each) Refill Capacity21.8 L
Axle Oil Without Coolers (Front And Rear, Each) Refill Capacity5.75 gal.
Hydraulic Reservoir With Filter Refill Capacity105.3 L
Hydraulic Reservoir With Filter Refill Capacity27.8 gal.
Parking Brake Oil (Wet Disc) Refill Capacity0.65 L
Parking Brake Oil (Wet Disc) Refill Capacity22 oz.

Wheels And Tires

Tread Width On Standard Tires2169 mm
Tread Width On Standard Tires85.4 in.
Width Over Tires On Standard Tires2875 mm
Width Over Tires On Standard Tires113.2 in.

Maximum Forward Travel Speeds (Standard 5-Speed With Lockup Torque Converter)

Tire Size Used To Measure Travel Speeds23.5 R 25
Range 1 7 km/h
Range 1 4.4 mph
Range 2 12 km/h
Range 2 7.5 mph
Range 3 20.4 km/h
Range 3 12.7 mph
Range 4 24.6 km/h
Range 4 15.3 mph

Axles And Brakes

Final DrivesHeavy-duty inboard-mounted planetary
Standard Differentials FrontHydraulic locking
Standard Differentials RearConventional
Optional Differentials FrontDual locking
Optional Differentials RearDual locking
Service Brakes (ISO 3450)Hydraulically actuated, inboard sun-shaft mounted, oil cooled, self adjusting, single disc
Parking Brake (ISO 3450)Automatic spring applied, hydraulically released, driveline mounted, oil cooled, multi disc

Electrical And Lighting

System Type24 volt with 100-amp alternator
Battery Voltage24 V
Number Of Batteries2
Battery Capacity Per Each950 CCA
Standard Alternator Rating100 amp
Optional Alternator Rating140 amp

Hydraulic System And Steering

Pump Type And System (Loader And Steering)Variable-displacement, axial-piston pump; closed-center, pressure-compensating system
Rated RPM2250 rpm
System Pressure At Max Rated Flow6895 kPa
System Pressure At Max Rated Flow1000 psi
Max Rated Flow At Rated RPM310.4 L/min
Max Rated Flow At Rated RPM82 gpm
System Relief Pressure (Loader And Steering)25165 kPa
System Relief Pressure (Loader And Steering)3650 psi
Loader ControlsTwo-function valve; joystick control or fingertip controls; hydraulic-function enable/disable; optional 3rd- and 4th-function valve with auxiliary lever
Steering Type (ISO 5010)Power, fully hydraulic
Steering Articulation Full Arc Angle80 degrees
Steering Articulation Angle Each Direction40 degrees
Turning Radius (Measured To Centerline Of Outside Tire)5.64 m
Turning Radius (Measured To Centerline Of Outside Tire)18.5 ft, in.
Hydraulic Raise Cycle Time5.3 seconds
Hydraulic Dump Cycle Time1.4 seconds
Hydraulic Lower (Power Down) Cycle Time3.8 seconds
Hydraulic Total Cycle Time10.5 seconds

Cooling

Fan Drive TypeHydraulically driven, proportionally controlled, fan aft of coolers