Head to head · Row Crop

Allis Chalmers D21 Series I vs Oliver 1950

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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
Oliver 1950 Tractor
OliverModel B

Oliver 1950

Row Crop

power
105 hp
displacement
212 ci
Cylinders
4
Forward gears
6
Full 1950 specs
Allis ChalmersAllis Chalmers D21 Series I
vs
OliverOliver 1950

How they compare

Headline specs vs. the whole Row Crop

n = 1,200–1,417

Engine Power

▲ 1950 higher · +2 hp (+2%)
D21 Series I103 hp
1950105 hp
Median Row Crop Tractor138 hp

D21 Series I is in the 27th percentile; 1950 is in the 28th · 1,206 models

Engine Displacement

▲ D21 Series I higher · +214 ci (+101%)
D21 Series I426 ci
1950212 ci
Median Row Crop Tractor391 ci

D21 Series I is in the 72nd percentile; 1950 is in the 10th · 1,409 models

Cylinders

▲ D21 Series I higher · +2 (+50%)
D21 Series I6
19504
Median Row Crop Tractor6

D21 Series I is in the 50th percentile; 1950 is in the 17th · 1,417 models

Forward Gears

▲ D21 Series I higher · +2 (+33%)
D21 Series I8
19506
Median Row Crop Tractor16

D21 Series I is in the 16th percentile; 1950 is in the 11th · 1,200 models

D21 Series I (A)1950 (B)Median Row Crop Tractor

Full comparison

Every spec, side by side

General Information

SpecAllis Chalmers D21 Series IOliver 1950Difference
ManufacturerAllis ChalmersOliver—
ModelD21 Series I1950—
CategoryRow CropRow CropSame

Engine

SpecAllis Chalmers D21 Series IOliver 1950Difference
ManufacturerAllis ChalmersGeneral Motors—
Model3400Apr-53—
Power Output103hp105hp▲ 1950+2 hp · +2%
Rated RPM2,200RPM2,400RPM▲ 1950+200 RPM · +9%
Cylinders64▲ D21 Series I+2 · +50%
Displacement426ci212ci▲ D21 Series I+214 ci · +101%
Bore4.3in3.9in▲ D21 Series I+0.4 in · +10%
Stroke5in4.5in▲ D21 Series I+0.5 in · +11%

Transmission

SpecAllis Chalmers D21 Series IOliver 1950Difference
TypeSliding gear with dry disc clutchGear—

Dimensions & Weight

SpecAllis Chalmers D21 Series IOliver 1950Difference
Length161inNot recorded—
Width91.6inNot recorded—
Height107inNot recorded—
Operating Weight9,500lb11,955lb▲ 1950+2,455 lb · +26%

Hydraulics

SpecAllis Chalmers D21 Series IOliver 1950Difference
Steering TypePowerHydraulic power—

Power Take-off (PTO)

SpecAllis Chalmers D21 Series IOliver 1950Difference
TypeIndependentIndependentSame
Speed 11,000rpm540rpm▲ D21 Series I+460 rpm · +85%

Hitch & Towing

SpecAllis Chalmers D21 Series IOliver 1950Difference
Hitch TypeThree-Point HitchNot recorded—
Hitch CategoryIII/IIII/I—
Hitch PositionRearRearSame

Chassis & Drive

SpecAllis Chalmers D21 Series IOliver 1950Difference
Chassis Type4x2 2WD4x2 2WDSame
Drive Type2WD2WDSame
Steering TypePowerHydraulic power—
Brake TypeBand actuated discDifferential disc—

Electrical

SpecAllis Chalmers D21 Series IOliver 1950Difference
Starter TypeElectricElectricSame

Capacities

SpecAllis Chalmers D21 Series IOliver 1950Difference
Coolant5.3galNot recorded—

Operator Station

SpecAllis Chalmers D21 Series IOliver 1950Difference
TypeOpenOpenSame

Category context

Both models against the field

Engine Power

median 138 hp
A · 27th percentile (103 hp)B · 28th percentile (105 hp)

Engine Displacement

median 391 ci
A · 72nd percentile (426 ci)B · 10th percentile (212 ci)

Cylinders

median 6
A · 50th percentile (6)B · 17th percentile (4)

Forward Gears

median 16
A · 16th percentile (8)B · 11th percentile (6)

Operating Weight

median 12,307 lb
A · 28th percentile (9,500 lb)B · 48th percentile (11,955 lb)
A · D21 Series IB · 1950Median Row Crop Tractor
Full spec pageAllis Chalmers D21 Series IFull spec pageOliver 1950