FieldSpec
Equipment menu

Machine models

John Deere 644A and 644B specifications

Entries in this reference
Listing-entry count
2
Short answer

John Deere 644A and 644B: wheel loaders.

Selected configuration figures
ConfigurationDocumented field and quantity
644A
Gross Power
141 hp
Pump Flow Capacity
60 gpm
644B
Gross Power
160 hp
Operating Weight
28,100 lb
644A and 644B specification matrix — Listing labels reported by the source
Publisher nameSource guideListing-entry countLabels named by the source
John Deere644A and 644B2644A and 644B
Bucket
Specification644A644B
Dump Clearance At Max Raise9.25 ft9.33 ft
Breakout Force41,515 lb24,120 lb
Bucket Capacity - Heaped2.5 yd32.5 yd3
Bucket Capacity - Struck2.05 yd32.05 yd3
Bucket Width8.7 ft8.73 ft
Dimensions and weight
Specification644A644B
Ground Clearance1.44 ft1.66 ft
Length With Bucket On Ground20.67 ft21.1 ft
Height To Top Of Cab10.17 ft10.63 ft
Wheelbase8.67 ft8.67 ft
Hinge Pin - Max Height11.85 ft12 ft
Reach At Max Lift And Dump2.92 ft2.89 ft
Engine
Specification644A644B
Net Power131 hp145 hp
Gross Power141 hp160 hp
Power Measured @2,400 rpm2,200 rpm
Max Torque345 lb-ft432 lb-ft
Displacement404 cu in531 cu in
Torque Measured @1,600 rpm1,500 rpm
AspirationTurbochargedTurbocharged
Specification644B
Number Of Cylinders6
Operational
Specification644A644B
Operating Weight2,520 lb28,100 lb
Fuel Capacity50 gal56 gal
Hydraulic System Fluid Capacity17.5 gal17.5 gal
Engine Oil Fluid Capacity4.3 gal5.5 gal
Cooling System Fluid Capacity9 gal12.3 gal
Transmission Fluid Capacity9.8 gal9.8 gal
Front Axle/Diff Fluid Capacity6 gal6 gal
Rear Axle/Diff Fluid Capacity6.5 gal6.3 gal
Static Tipping Weight18,604 lb22,905 lb
Turning Radius15.5 ft15.5 ft
Operating Voltage12 V12 V
Alternator Supplied Amperage55 amps42 amps
Rear Axle Oscillation22 degrees22 degrees
Tire Size16-24 / 20.5- 2514.5-25 / 20.5-25
Transmission and speeds
Specification644A644B
Transmission TypePowershift TransmissionPower shift Planetary
Number Of Forward Gears44
Number Of Reverse Gears22
Max Speed - Forward23 mph25.8 mph
Max Speed - Reverse9.5 mph10.2 mph
Hydraulic System
Specification644A644B
Relief Valve Setting2,250 psi2,250 psi
Pump Flow Capacity60 gpm58.2 gpm
Pump TypeVariable displacement type pumpGear
Variants — Source comparison annotation
Source guideDiffering-field count reported
644A and 644B28
Ratios
Figure644A644B
Engine horsepower per 1,000 lb of weight52.05.2
Pump flow per engine horsepower0.46 gpm0.40 gpm
Fuel tank per engine horsepower0.38 gal0.39 gal

644A and 644B: owner reports

Sources: 3 forum discussions about the John Deere 644J wheel loaders; heavyequipmentforums.com.
644A and 644B: forum references — Forum-title search
Forum indexEquipment class queriedNames in the searchMatching titles
Heavy Equipment Forumswheel loaderJohn Deere and the 644A, 644B16
Topics named by those titles
Title topicTitles
fuel system2
hydraulics2
Topic in the titleThreadsShare of matching threads
fuel system213%
hydraulics213%
Used market for the 644A and 644B — Dated first-page listing snapshot
Observation dateListing sourceEquipment searchListings
2026-09-24MachineryTraderJohn Deere wheel loader8
ModelListedModel yearsLowest askingHighest askingMedian askingMedian hours
644A31972 to 1973$16,500$27,500$22,0004,641
644B51978 to 1979$9,900$30,000$12,8182,394
644A and 644B: recall reference — Dated CPSC search
Search dateDatabaseNames queriedSearch result
2026-09-24U.S. Consumer Product Safety CommissionJohn Deere together with the wheel loader 644A, 644BNo matching recall in this search

Sources for this page

Evidence classDocument, classification and recorded date
Reference site
Reference site
Forum threads
Forum threads
Used-market listings
Federal agency data

John Deere 644A and 644B: Configuration records

644A
SpecificationSource figure
Dimensions and weight
Ground Clearance1.44 ft
Length With Bucket On Ground20.67 ft
Wheelbase8.67 ft
Reach At Max Lift And Dump2.92 ft
Height To Top Of Cab10.17 ft
Hinge Pin - Max Height11.85 ft
Engine
Gross Power141 hp
Displacement404 cu in
Net Power131 hp
Power Measured @2,400 rpm
Max Torque345 lb-ft
Torque Measured @1,600 rpm
AspirationTurbocharged
Operational
Fuel Capacity50 gal
Hydraulic System Fluid Capacity17.5 gal
Engine Oil Fluid Capacity4.3 gal
Cooling System Fluid Capacity9 gal
Transmission Fluid Capacity9.8 gal
Front Axle/Diff Fluid Capacity6 gal
Rear Axle/Diff Fluid Capacity6.5 gal
Rear Axle Oscillation22 degrees
Tire Size16-24 / 20.5- 25
Operating Voltage12 V
Alternator Supplied Amperage55 amps
Static Tipping Weight18,604 lb
Turning Radius15.5 ft
Transmission and speeds
Number Of Forward Gears4
Number Of Reverse Gears2
Max Speed - Forward23 mph
Max Speed - Reverse9.5 mph
Transmission TypePowershift Transmission
Hydraulic System
Relief Valve Setting2,250 psi
Pump Flow Capacity60 gpm
Pump TypeVariable displacement type pump
Bucket
Dump Clearance At Max Raise9.25 ft
Bucket Capacity - Heaped2.5 yd3
Bucket Width8.7 ft
Breakout Force41,515 lb
Bucket Capacity - Struck2.05 yd3

Source

644B
SpecificationSource figure
Dimensions and weight
Ground Clearance1.66 ft
Length With Bucket On Ground21.1 ft
Wheelbase8.67 ft
Reach At Max Lift And Dump2.89 ft
Height To Top Of Cab10.63 ft
Hinge Pin - Max Height12 ft
Engine
Gross Power160 hp
Displacement531 cu in
Number Of Cylinders6
Net Power145 hp
Power Measured @2,200 rpm
Max Torque432 lb-ft
Torque Measured @1,500 rpm
AspirationTurbocharged
Operational
Operating Weight28,100 lb
Fuel Capacity56 gal
Hydraulic System Fluid Capacity17.5 gal
Engine Oil Fluid Capacity5.5 gal
Cooling System Fluid Capacity12.3 gal
Transmission Fluid Capacity9.8 gal
Front Axle/Diff Fluid Capacity6 gal
Rear Axle/Diff Fluid Capacity6.3 gal
Rear Axle Oscillation22 degrees
Tire Size14.5-25 / 20.5-25
Operating Voltage12 V
Alternator Supplied Amperage42 amps
Static Tipping Weight22,905 lb
Turning Radius15.5 ft
Transmission and speeds
Number Of Forward Gears4
Number Of Reverse Gears2
Max Speed - Forward25.8 mph
Max Speed - Reverse10.2 mph
Transmission TypePower shift Planetary
Hydraulic System
Relief Valve Setting2,250 psi
Pump Flow Capacity58.2 gpm
Pump TypeGear
Bucket
Dump Clearance At Max Raise9.33 ft
Bucket Capacity - Heaped2.5 yd3
Bucket Width8.73 ft
Breakout Force24,120 lb
Bucket Capacity - Struck2.05 yd3

Source

Compare John Deere 644A, 644B
Bucket
Specification644A644B
Dump Clearance At Max Raise9.25 ft9.33 ft
Breakout Force41,515 lb24,120 lb
Bucket Capacity - Heaped2.5 yd32.5 yd3
Bucket Capacity - Struck2.05 yd32.05 yd3
Bucket Width8.7 ft8.73 ft
Dimensions and weight
Specification644A644B
Ground Clearance1.44 ft1.66 ft
Length With Bucket On Ground20.67 ft21.1 ft
Height To Top Of Cab10.17 ft10.63 ft
Wheelbase8.67 ft8.67 ft
Hinge Pin - Max Height11.85 ft12 ft
Reach At Max Lift And Dump2.92 ft2.89 ft
Engine
Specification644A644B
Net Power131 hp145 hp
Gross Power141 hp160 hp
Power Measured @2,400 rpm2,200 rpm
Max Torque345 lb-ft432 lb-ft
Displacement404 cu in531 cu in
Torque Measured @1,600 rpm1,500 rpm
AspirationTurbochargedTurbocharged
Operational
Specification644A644B
Fuel Capacity50 gal56 gal
Hydraulic System Fluid Capacity17.5 gal17.5 gal
Engine Oil Fluid Capacity4.3 gal5.5 gal
Cooling System Fluid Capacity9 gal12.3 gal
Transmission Fluid Capacity9.8 gal9.8 gal
Front Axle/Diff Fluid Capacity6 gal6 gal
Rear Axle/Diff Fluid Capacity6.5 gal6.3 gal
Static Tipping Weight18,604 lb22,905 lb
Turning Radius15.5 ft15.5 ft
Operating Voltage12 V12 V
Alternator Supplied Amperage55 amps42 amps
Rear Axle Oscillation22 degrees22 degrees
Tire Size16-24 / 20.5- 2514.5-25 / 20.5-25
Transmission and speeds
Specification644A644B
Transmission TypePowershift TransmissionPower shift Planetary
Number Of Forward Gears44
Number Of Reverse Gears22
Max Speed - Forward23 mph25.8 mph
Max Speed - Reverse9.5 mph10.2 mph
Hydraulic System
Specification644A644B
Relief Valve Setting2,250 psi2,250 psi
Pump Flow Capacity60 gpm58.2 gpm
Pump TypeVariable displacement type pumpGear

More in John Deere: 644EH–644H Waste Handler specs, 544H–644J Z-Bar, 544K–724J Z-Bar.