Head to head · Row Crop

Allis Chalmers D21 Series I vs Allis Chalmers D21 Series II

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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
Allis ChalmersAllis Chalmers D21 Series I
vs
Allis ChalmersAllis Chalmers D21 Series II

How they compare

Headline specs vs. the whole Row Crop

n = 806–1,417

Engine Power

▲ D21 Series II higher · +18 hp (+17%)
D21 Series I103 hp
D21 Series II121 hp
Median Row Crop Tractor138 hp

D21 Series I is in the 27th percentile; D21 Series II is in the 40th · 1,206 models

Engine Displacement

= Effectively tied
D21 Series I426 ci
D21 Series II426 ci
Median Row Crop Tractor391 ci

D21 Series I is in the 72nd percentile; D21 Series II is in the 72nd · 1,409 models

Cylinders

= Effectively tied
D21 Series I6
D21 Series II6
Median Row Crop Tractor6

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

Forward Gears

= Effectively tied
D21 Series I8
D21 Series II8
Median Row Crop Tractor16

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

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

Full comparison

Every spec, side by side

General Information

SpecAllis Chalmers D21 Series IAllis Chalmers D21 Series IIDifference
ManufacturerAllis ChalmersAllis ChalmersSame
ModelD21 Series ID21 Series II—
CategoryRow CropRow CropSame

Engine

SpecAllis Chalmers D21 Series IAllis Chalmers D21 Series IIDifference
ManufacturerAllis ChalmersAllis ChalmersSame
Model34003500—
Power Output103hp121hp▲ D21 Series II+18 hp · +17%
Rated RPM2,200RPM2,200RPMSame
Cylinders66Same
Displacement426ci426ciSame
Bore4.3in4.3inSame
Stroke5in5inSame

Transmission

SpecAllis Chalmers D21 Series IAllis Chalmers D21 Series IIDifference
TypeSliding gear with dry disc clutchSliding gear with dry disc clutchSame

Dimensions & Weight

SpecAllis Chalmers D21 Series IAllis Chalmers D21 Series IIDifference
Length161in160in▲ D21 Series I+1 in · <1%
Width91.6in91.3in▲ D21 Series I+0.3 in · <1%
Height107in106in▲ D21 Series I+1 in · <1%
Operating Weight9,500lb9,502lb▲ D21 Series II+2 lb · <1%

Hydraulics

SpecAllis Chalmers D21 Series IAllis Chalmers D21 Series IIDifference
Steering TypePowerPowerSame

Power Take-off (PTO)

SpecAllis Chalmers D21 Series IAllis Chalmers D21 Series IIDifference
TypeIndependentIndependentSame
Speed 11,000rpm1,000rpmSame

Hitch & Towing

SpecAllis Chalmers D21 Series IAllis Chalmers D21 Series IIDifference
Hitch TypeThree-Point HitchThree-Point HitchSame
Hitch CategoryIII/IIIII/IISame
Hitch PositionRearRearSame

Chassis & Drive

SpecAllis Chalmers D21 Series IAllis Chalmers D21 Series IIDifference
Chassis Type4x2 2WD4x2 2WDSame
Drive Type2WD2WDSame
Steering TypePowerPowerSame
Brake TypeBand actuated discBand actuated discSame

Electrical

SpecAllis Chalmers D21 Series IAllis Chalmers D21 Series IIDifference
Starter TypeElectricElectricSame

Capacities

SpecAllis Chalmers D21 Series IAllis Chalmers D21 Series IIDifference
Coolant5.3gal7.8gal▲ D21 Series II+2.5 gal · +47%

Operator Station

SpecAllis Chalmers D21 Series IAllis Chalmers D21 Series IIDifference
TypeOpenOpenSame

Category context

Both models against the field

Engine Power

median 138 hp
A · 27th percentile (103 hp)B · 40th percentile (121 hp)

Engine Displacement

median 391 ci
A · 72nd percentile (426 ci)B · 72nd percentile (426 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 · 28th percentile (9,502 lb)
A · D21 Series IB · D21 Series IIMedian Row Crop Tractor
Full spec pageAllis Chalmers D21 Series IFull spec pageAllis Chalmers D21 Series II