Compare/John Deere 3640 vs John Deere 7420

John Deere 3640 vs John Deere 7420

Verdict: John Deere 3640 vs John Deere 7420

The John Deere 3640 and the John Deere 7420 are both tractors — here is how they stack up on the figures that matter. Both are rated at the same 117 hp. John Deere 3640 is the lighter machine (10,564 kg vs 12,890 kg), which helps on soft ground and transport, while the heavier model carries more ballast for traction-limited draft work. John Deere 7420 is the newer design (2003 vs 1984). Use the full side-by-side spec tables below to weigh the details against your own operation, and confirm with a dealer demo.

Tune the fit score

Tell us about your operation

Acreage600 acBudgetMain crop / use

Fit & specs

John Deere

Fit score

Best match

Clear

John Deere

Fit score

Best match

Clear

Rated power

117 hp

Confidence

98%

Guide price

—

Overview

Manufacturer

John DeereReference

With 18.4-38 rear tires.Reference

available with MFWD onlyReference

Final drives

planetaryReference

inboard planetaryReference

Differential lock

rear standardReference

electro-hydraulic rearReference

Engine

Engine (gross)

87.2 kWReference

—

Displacement

5.9 LReference

6.8 LReference

Bore/Stroke

106 x 110 mmReference

106 x 127 mmReference

Power (gross)

87.2 kWReference

—

Fuel system

direct injectionReference

—

Air cleaner

dryReference

dual paper elementsReference

Compression

17.4:1Reference

17:1Reference

Rated RPM

2400Reference

2100Reference

Torque

393.2 NmReference

610.2 NmReference

Torque RPM

1400Reference

1500Reference

Starter volts

12Reference

Oil capacity

42.0 LReference

56.0 LReference

Coolant capacity

19.0 LReference

28.0 LReference

Fuel tank

—

207.0 LReference

Engine

—

100.7 kWReference

Drawbar (tested)

—

76.7 kWReference

Power

—

100.7 kWReference

Idle RPM

—

850-2250Reference

Operating RPM

—

1300-2100Reference

Firing order

—

1-5-3-6-2-4Reference

Starter power

—

3.1 kWReference

Max power

—

76.7 kWReference

Power at rated engine speed

—

86.9 kWReference

Transmission

Power SynchronReference

Infinitely Variable Transmission (IVT)Reference

Gears

16 forward and 8 reverseReference

infinite forward and reverseReference

Capacities

Fuel

186.2 LReference

—

Max capacity

8019 kgReference

9995 kgReference

PTO & Hydraulics

Hydraulic system

42.0 LReference

—

Type

partial power shiftReference

Capacity

42.0 LReference

—

Pressure

170.0 barReference

—

Pump flow

84.0 lpmReference

101.1 lpmReference

Rear Type

II/IIIReference

IIReference

Control

lower-link draft sensingReference

—

Rear lift (at ends)

5814 kgReference

—

Rear lift (at 24"/610mm)

3597 kgReference

—

Front Hitch

optionalReference

—

Rear PTO

independentReference

Clutch

hydraulic cerametallic dry discReference

electro-hydraulicReference

Rear PTO Type

540/1000Reference

540/1000 (1.375)Reference

Engine RPM

1000@2175Reference

—

Front PTO

optionalReference

independentReference

PTO (claimed)

—

85.8 kWReference

PTO (tested)

—

95.0 kWReference

Valves

—

4Reference

Rear lift

—

3946 kgReference

Front PTO Type

—

1000Reference

Dimensions

Wheelbase

259 cmReference

—

Weight

10564 to 12929 poundsReference

12890 to 13280 poundsReference

Front tire

12.4-28Reference

14.9R28Reference

Rear tire

16.9-38Reference

18.4R38Reference

Standard tires (ag)

Front: 16.9-24. Rear: 18.4-38Reference

—

Length

480 cmReference

516 cmReference

Width

215 cmReference

243 cmReference

Height (cab)

281 cmReference

—

Height (exhaust)

297 cmReference

—

Clearance (front axle)

53 cmReference

—

Front tread

160 to 210 cmReference

150 to 211 cmReference

Rear tread

160/175/185/193/200 cmReference

152 to 302 cmReference

Shipping

4791 kgReference

5846 kgReference

Operating

5864 kgReference

6023 kgReference

2WD Wheelbase

—

286 cmReference

4WD Wheelbase

—

264 cmReference

Ag front

—

14.9R28Reference

Ag rear

—

18.4R38Reference

Height

—

289 cmReference

4WD Clearance (front axle)

—

52 cmReference

Flanged rear axle

—

1663 mmReference

Rack-and-pinion rear axle

—

86 by 2806 mmReference

Ballasted

—

7101 kgReference

Max Drawbar

—

2247 kgReference

Max front axle

—

6849 kgReference

Max rear axle

—

7795 kgReference

Electrical

Ground

negativeReference

Charging system

alternatorReference

Charging amps

55Reference

150Reference

Batteries

2Reference

—

Battery volts

12Reference

Battery AH

88Reference

—

Battery CCA

—

850Reference

Speeds

Variants

7420

—

row-cropReference

7420HC

—

high-cropReference

John Deere 7420 attachments

7420 Serial Numbers

2003

—

1001Reference

2004

—

10001Reference

2005

—

30001Reference

2006

—

45001Reference

2007

—

60001Reference

Location:

—

On the main tractor frame, right side, above the front axle.Reference

Test results

Fuel use

—

25.4 l/hourReference

Fit score weighs budget, operation size, crop match and data confidence against the details above. It’s guidance, not advice — always confirm with a dealer demo.