Head to head · Row Crop

Allis Chalmers D21 Series I vs John Deere 4020

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Allis ChalmersModel A

Allis Chalmers D21 Series I

Row Crop

power
103 hp
displacement
426 ci
Cylinders
6
Forward gears
8
Full D21 Series I specs
Image not recorded
John DeereModel B

John Deere 4020

Industrial

power
101 hp
displacement
404 ci
Cylinders
6
Forward gears
8
Full 4020 specs
Allis ChalmersAllis Chalmers D21 Series I
vs
John DeereJohn Deere 4020

How they compare

Headline specs vs. the whole Row Crop

n = 806–1,417

Engine Power

▲ D21 Series I higher · +2 hp (+2%)
D21 Series I103 hp
4020101 hp
Median Row Crop Tractor138 hp

D21 Series I is in the 27th percentile; 4020 is in the 26th · 1,206 models

Engine Displacement

▲ D21 Series I higher · +22 ci (+5%)
D21 Series I426 ci
4020404 ci
Median Row Crop Tractor391 ci

D21 Series I is in the 72nd percentile; 4020 is in the 57th · 1,409 models

Cylinders

= Effectively tied
D21 Series I6
40206
Median Row Crop Tractor6

D21 Series I is in the 50th percentile; 4020 is in the 50th · 1,417 models

Forward Gears

= Effectively tied
D21 Series I8
40208
Median Row Crop Tractor16

D21 Series I is in the 16th percentile; 4020 is in the 16th · 1,200 models

D21 Series I (A)4020 (B)Median Row Crop Tractor

Full comparison

Every spec, side by side

General Information

SpecAllis Chalmers D21 Series IJohn Deere 4020Difference
ManufacturerAllis ChalmersJohn Deere—
ModelD21 Series I4020—
CategoryRow CropIndustrial—

Engine

SpecAllis Chalmers D21 Series IJohn Deere 4020Difference
ManufacturerAllis ChalmersJohn Deere—
Model3400Not recorded—
Power Output103hp101hp▲ D21 Series I+2 hp · +2%
Rated RPM2,200RPM2,200RPMSame
Cylinders66Same
Displacement426ci404ci▲ D21 Series I+22 ci · +5%
Bore4.3in4.3inSame
Stroke5in4.8in▲ D21 Series I+0.2 in · +4%

Transmission

SpecAllis Chalmers D21 Series IJohn Deere 4020Difference
TypeSliding gear with dry disc clutchPartially synchronized (Syncro-Range)—

Dimensions & Weight

SpecAllis Chalmers D21 Series IJohn Deere 4020Difference
Length161in151in▲ D21 Series I+10 in · +7%
Width91.6in89.4in▲ D21 Series I+2.2 in · +2%
Height107in77.9in▲ D21 Series I+29.1 in · +37%
Operating Weight9,500lb8,645lb▲ D21 Series I+855 lb · +10%

Hydraulics

SpecAllis Chalmers D21 Series IJohn Deere 4020Difference
System TypeNot recordedClosed center—
Steering TypePowerPowerSame

Power Take-off (PTO)

SpecAllis Chalmers D21 Series IJohn Deere 4020Difference
TypeIndependentIndependentSame
Speed 11,000rpm540rpm▲ D21 Series I+460 rpm · +85%
Speed 2Not recorded1,000rpm—

Hitch & Towing

SpecAllis Chalmers D21 Series IJohn Deere 4020Difference
Hitch TypeThree-Point HitchThree-Point HitchSame
Hitch CategoryIII/IIII—
Hitch PositionRearRearSame
Hitch CapacityNot recorded3,790lb—

Chassis & Drive

SpecAllis Chalmers D21 Series IJohn Deere 4020Difference
Chassis Type4x2 2WD4x2 2WDSame
Drive Type2WD2WDSame
Steering TypePowerPowerSame
Brake TypeBand actuated discHydraulic wet disc—

Electrical

SpecAllis Chalmers D21 Series IJohn Deere 4020Difference
Starter TypeElectricElectricSame

Capacities

SpecAllis Chalmers D21 Series IJohn Deere 4020Difference
Coolant5.3gal6gal▲ 4020+0.7 gal · +13%

Operator Station

SpecAllis Chalmers D21 Series IJohn Deere 4020Difference
TypeOpenOpenSame

Category context

Both models against the field

Engine Power

median 138 hp
A · 27th percentile (103 hp)B · 26th percentile (101 hp)

Engine Displacement

median 391 ci
A · 72nd percentile (426 ci)B · 57th percentile (404 ci)

Cylinders

median 6
A · 50th percentile (6)B · 50th percentile (6)

Forward Gears

median 16
A · 16th percentile (8)B · 16th percentile (8)

Operating Weight

median 12,307 lb
A · 28th percentile (9,500 lb)B · 24th percentile (8,645 lb)
A · D21 Series IB · 4020Median Row Crop Tractor
Full spec pageAllis Chalmers D21 Series IFull spec pageJohn Deere 4020