Head to head · Agricultural

Allis Chalmers HD21 vs John Deere 8R 250

Allis Chalmers HD21 Tractor
Allis ChalmersModel A

Allis Chalmers HD21

Agricultural

power
225 hp
displacement
844 ci
Cylinders
6
Forward gears
2
Full HD21 specs
Image not recorded
John DeereModel B

John Deere 8R 250

Row Crop

power
225 hp
displacement
548 ci
Cylinders
6
Forward gears
23
Full 8R 250 specs
Allis ChalmersAllis Chalmers HD21
vs
John DeereJohn Deere 8R 250

How they compare

Headline specs vs. the whole Agricultural

n = 795–1,130

Engine Power

= Effectively tied
HD21225 hp
8R 250225 hp
Median Agricultural Tractor110 hp

HD21 is in the 84th percentile; 8R 250 is in the 85th · 1,028 models

Engine Displacement

▲ HD21 higher · +296 ci (+54%)
HD21844 ci
8R 250548 ci
Median Agricultural Tractor336 ci

HD21 is in the 96th percentile; 8R 250 is in the 90th · 1,083 models

Cylinders

= Effectively tied
HD216
8R 2506
Median Agricultural Tractor5.5

HD21 is in the 74th percentile; 8R 250 is in the 74th · 1,130 models

Forward Gears

▲ 8R 250 higher · +21 (+1050%)
HD212
8R 25023
Median Agricultural Tractor16

HD21 is in the 1st percentile; 8R 250 is in the 76th · 972 models

HD21 (A)8R 250 (B)Median Agricultural Tractor

Full comparison

Every spec, side by side

General Information

SpecAllis Chalmers HD21John Deere 8R 250Difference
ManufacturerAllis ChalmersJohn Deere—
ModelHD218R 250—
CategoryAgriculturalRow Crop—

Engine

SpecAllis Chalmers HD21John Deere 8R 250Difference
ManufacturerAllis-ChalmersJohn Deere—
ModelNot recordedRG6090U094226—
Power Output225hp225hpSame
Rated RPM1,800RPMNot recorded—
Cylinders66Same
Displacement844ci548ci▲ HD21+296 ci · +54%
Bore5.3in4.7in▲ HD21+0.6 in · +13%
Stroke6.5in5.4in▲ HD21+1.1 in · +20%

Transmission

SpecAllis Chalmers HD21John Deere 8R 250Difference
TypeTorque ConverterFull Power Shift, e23 Transmission—

Dimensions & Weight

SpecAllis Chalmers HD21John Deere 8R 250Difference
Length198in253in▲ 8R 250+55 in · +28%
Height99in138in▲ 8R 250+39 in · +39%
Operating Weight45,500lb27,405lb▲ HD21+18,095 lb · +66%

Hydraulics

SpecAllis Chalmers HD21John Deere 8R 250Difference
System TypeNot recordedClosed-Center Pressure Flow Compensated—
Steering TypeNot recordedPower—

Power Take-off (PTO)

SpecAllis Chalmers HD21John Deere 8R 250Difference
Speed 3Not recorded1,000rpm—

Hitch & Towing

SpecAllis Chalmers HD21John Deere 8R 250Difference
Hitch TypeNot recordedThree-Point Hitch Category III/IIIN—
Hitch CategoryNot recordedCategory 3—
Hitch PositionNot recordedRear—
Hitch CapacityNot recorded20,254lb—

Chassis & Drive

SpecAllis Chalmers HD21John Deere 8R 250Difference
Chassis TypeNot recorded4x4 MFWD 4WD—
Drive TypeNot recorded4WD—
Steering TypeNot recordedPower—

Electrical

SpecAllis Chalmers HD21John Deere 8R 250Difference
Starter TypeElectricElectricSame

Capacities

SpecAllis Chalmers HD21John Deere 8R 250Difference
Coolant20galNot recorded—

Operator Station

SpecAllis Chalmers HD21John Deere 8R 250Difference
TypeNot recordedCab—

Category context

Both models against the field

Engine Power

median 110 hp
A · 84th percentile (225 hp)B · 85th percentile (225 hp)

Engine Displacement

median 336 ci
A · 96th percentile (844 ci)B · 90th percentile (548 ci)

Cylinders

median 5.5
A · 74th percentile (6)B · 74th percentile (6)

Forward Gears

median 16
A · 1st percentile (2)B · 76th percentile (23)

Operating Weight

median 10,914 lb
A · 99th percentile (45,500 lb)B · 93rd percentile (27,405 lb)
A · HD21B · 8R 250Median Agricultural Tractor
Full spec pageAllis Chalmers HD21Full spec pageJohn Deere 8R 250