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Lawn Tractor · 1983Unverified

John Deere 420

Name: John Deere 420
Brand: John Deere

John Deere 420 — 400 Series · 20 hp. Reference specifications; pending source verification.

The John Deere 420 is a lawn tractor model with a rated power output of 20 hp, positioning it at the more powerful end of its category. Built between 1983 and 1991, this model features a 2-cylinder petrol air-cooled engine and a hydrostatic transmission with two-wheel drive. Its listed operating weight is 450 kg, and it is suitable for operations of up to 200 acres.

Provisional listing — the headline figure is shown; full specifications are auto-generated and pending verification against published sources.

Rated power

20 hp

Weight

450 kg

Catalogue coverage

Variants represented

Richest spec table

97 rows

Recorded power

20 hp

Recorded weight

450 kg

Transmissions

hydrostatic

Production years

1983-1991

Verified variants

1 linked source document displayed

Hover a source tag to verify

Overview

ManufacturerJohn DeereReference

Garden tractorReference

Built in Horicon, Wisconsin, USAReference

Original price$6,489 (1983 )Reference

Original price$7,700 (1992 )Reference

Two-wheel driveReference

Differential lockmechanical rearReference

Power steeringReference

Differential mechanical drum brakesReference

Open operator station.Reference

Engine

20HP Onan 781cc 2-cyl gasolineReference

Fuel tank24.6 LReference

Onan B48GReference

gasolineReference

2-cylinderReference

air-cooled horizontal-shaft opposed-twinReference

The B48G was the original engine on the Deere 420, used through the 1986 model year.Reference

Displacement47.7 ciReference

Bore/Stroke83 x 73 mmReference

Power (gross)14.9 kWReference

Air cleanerfoam and paperReference

Compression7.0:1Reference

Rated RPM3500Reference

Idle RPM1000-3450Reference

Starter volts12Reference

Oil capacity1.7 LReference

Onan P220GReference

The P220G replaced the B48G in the John Deere 420 during the 1987 model year, starting at tractor serial number 420001.Reference

Bore/Stroke83 x 73 mmReference

Power14.9 kWReference

Rated RPM3600Reference

SparkplugNGK BPR5EFSReference

SparkplugChampion RS14YCReference

Image courtesy of Terry RussellReference

Transmission

hydrostaticReference

TransmissionSundstrand Series 15 Model 90Reference

Typeshaft-driven hydrostaticReference

Gearsinfinite forward and reverse (2-range)Reference

Oil capacity7.1 LReference

Oil typeJD Hy-GardReference

1ThrottleReference

2Forward/reverseReference

3Left brakeReference

4Right brakeReference

5Range shiftReference

6Differential lockReference

PTO & Hydraulics

Rear Type0Reference

Controldirectional controlReference

Rear lift290 kgReference

Rear PTOindependentReference

ClutchelectricReference

Rear PTO Type2000Reference

Front PTOindependentReference

Front PTO TypepulleyReference

Dimensions

Wheelbase132 cmReference

Weight450 kgReference

Front tire18x8.50-8Reference

Rear tire26x12.00-12Reference

Ag front4.80x4.00-8Reference

Ag rear23x10.50-12Reference

Lawn/turf front18x8.50-8Reference

Lawn/turf rear26x12.00-12Reference

Length195 cmReference

Width130 cmReference

Height120 cmReference

Front tread91 cmReference

Rear tread81/98 cmReference

Shipping450 kgReference

Max front axle480 kgReference

Max rear axle816 kgReference

John Deere 420 attachments

50" mid-mount mower deckReference

60" mid-mount mower deckReference

snowblowerReference

bladeReference

front-end loaderReference

420 Serial Number Location

Serial number plate below steering column.Reference

420 Serial Numbers

1983M00420X222001Reference

1984M00420X285001Reference

1985M00420X315001Reference

1986M00420X360001Reference

1987M00420X420001Reference

1988M00420X475001Reference

1989M00420X595001Reference

1990M00420X010001Reference

1991M00420X100001Reference

FAQ: How to read a serial number table.Reference

Electrical

GroundnegativeReference

Charging systemalternatorReference

Charging amps20Reference

Battery volts12Reference

Battery GroupBCI 22FReference

Attachment overview

50" mid-mount mower deckReference

60" mid-mount mower deckReference

SnowblowerReference

BladeReference

Front-end loaderReference

A rear-mounted finish mower was available for the 420 if the tractor was equipped with 2000 RPM rear PTO and a three-point hitch.Reference

Values normalized to UK metric units. Every figure is traced to at least one source; verified specs are cross-checked against two or more.

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