Head to head · Agricultural

Allis Chalmers HD21 vs John Deere 8400

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 8400

Row Crop

power
225 hp
displacement
496 ci
Cylinders
6
Forward gears
16
Full 8400 specs
Allis ChalmersAllis Chalmers HD21
vs
John DeereJohn Deere 8400

How they compare

Headline specs vs. the whole Agricultural

n = 795–1,130

Engine Power

= Effectively tied
HD21225 hp
8400225 hp
Median Agricultural Tractor110 hp

HD21 is in the 84th percentile; 8400 is in the 84th · 1,028 models

Engine Displacement

▲ HD21 higher · +348 ci (+70%)
HD21844 ci
8400496 ci
Median Agricultural Tractor336 ci

HD21 is in the 96th percentile; 8400 is in the 84th · 1,083 models

Cylinders

= Effectively tied
HD216
84006
Median Agricultural Tractor5.5

HD21 is in the 74th percentile; 8400 is in the 74th · 1,130 models

Forward Gears

▲ 8400 higher · +14 (+700%)
HD212
840016
Median Agricultural Tractor16

HD21 is in the 1st percentile; 8400 is in the 50th · 972 models

HD21 (A)8400 (B)Median Agricultural Tractor

Full comparison

Every spec, side by side

General Information

SpecAllis Chalmers HD21John Deere 8400Difference
ManufacturerAllis ChalmersJohn Deere—
ModelHD218400—
CategoryAgriculturalRow Crop—

Engine

SpecAllis Chalmers HD21John Deere 8400Difference
ManufacturerAllis-ChalmersJohn Deere—
ModelNot recordedJohn Deere—
Power Output225hp225hpSame
Rated RPM1,800RPM2,200RPM▲ 8400+400 RPM · +22%
Cylinders66Same
Displacement844ci496ci▲ HD21+348 ci · +70%
Bore5.3in4.6in▲ HD21+0.7 in · +15%
Stroke6.5in5.1in▲ HD21+1.4 in · +27%

Transmission

SpecAllis Chalmers HD21John Deere 8400Difference
TypeTorque ConverterFull power shift—

Dimensions & Weight

SpecAllis Chalmers HD21John Deere 8400Difference
Length198in206in▲ 8400+8 in · +4%
Height99in120in▲ 8400+21 in · +21%
Operating Weight45,500lb19,191lb▲ HD21+26,309 lb · +137%

Hydraulics

SpecAllis Chalmers HD21John Deere 8400Difference
System TypeNot recordedClosed center pressure-flow compensated (PFC)—
Steering TypeNot recordedPower—

Power Take-off (PTO)

SpecAllis Chalmers HD21John Deere 8400Difference
TypeNot recordedIndependent—
Speed 1Not recorded1,000rpm—
Speed 2Not recorded540rpm—
Speed 3Not recorded1,000rpm—

Hitch & Towing

SpecAllis Chalmers HD21John Deere 8400Difference
Hitch TypeNot recorded3/3N—
Hitch CategoryNot recordedCategory 3—
Hitch CapacityNot recorded11,710lb—

Chassis & Drive

SpecAllis Chalmers HD21John Deere 8400Difference
Chassis TypeNot recorded4x4 MFWD 4WD—
Drive TypeNot recordedMFWD 4WD—
Steering TypeNot recordedPower—
Brake TypeNot recordedDifferential hydraulic wet disc—

Electrical

SpecAllis Chalmers HD21John Deere 8400Difference
Starter TypeElectricElectricSame

Capacities

SpecAllis Chalmers HD21John Deere 8400Difference
Coolant20gal7.5gal▲ HD21+12.5 gal · +167%

Operator Station

SpecAllis Chalmers HD21John Deere 8400Difference
TypeNot recordedCommandView Cab—

Category context

Both models against the field

Engine Power

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

Engine Displacement

median 336 ci
A · 96th percentile (844 ci)B · 84th percentile (496 ci)

Cylinders

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

Forward Gears

median 16
A · 1st percentile (2)B · 50th percentile (16)

Operating Weight

median 10,914 lb
A · 99th percentile (45,500 lb)B · 81st percentile (19,191 lb)
A · HD21B · 8400Median Agricultural Tractor
Full spec pageAllis Chalmers HD21Full spec pageJohn Deere 8400