Head to head · Agricultural

Allis Chalmers HD21 vs John Deere 8400T

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 8400T

Crawler

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

How they compare

Headline specs vs. the whole Agricultural

n = 795–1,130

Engine Power

▲ 8400T higher · +2 hp (<1%)
HD21225 hp
8400T227 hp
Median Agricultural Tractor110 hp

HD21 is in the 84th percentile; 8400T is in the 85th · 1,028 models

Engine Displacement

▲ HD21 higher · +348 ci (+70%)
HD21844 ci
8400T496 ci
Median Agricultural Tractor336 ci

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

Cylinders

= Effectively tied
HD216
8400T6
Median Agricultural Tractor5.5

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

Forward Gears

▲ 8400T higher · +14 (+700%)
HD212
8400T16
Median Agricultural Tractor16

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

HD21 (A)8400T (B)Median Agricultural Tractor

Full comparison

Every spec, side by side

General Information

SpecAllis Chalmers HD21John Deere 8400TDifference
ManufacturerAllis ChalmersJohn Deere—
ModelHD218400T—
CategoryAgriculturalCrawler—

Engine

SpecAllis Chalmers HD21John Deere 8400TDifference
ManufacturerAllis-ChalmersJohn Deere—
ModelNot recordedSerial No.*RG6081 H040198*—
Power Output225hp227hp▲ 8400T+2 hp · <1%
Rated RPM1,800RPM2,000RPM▲ 8400T+200 RPM · +11%
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 8400TDifference
TypeTorque ConverterFull powershift—

Dimensions & Weight

SpecAllis Chalmers HD21John Deere 8400TDifference
Length198in207in▲ 8400T+9 in · +5%
WidthNot recorded104in—
Height99in123in▲ 8400T+24 in · +24%
Operating Weight45,500lb25,000lb▲ HD21+20,500 lb · +82%

Hydraulics

SpecAllis Chalmers HD21John Deere 8400TDifference
System TypeNot recordedClosed center pressure-flow compensated (PFC)—
Steering TypeNot recordedHydrostatic power—

Power Take-off (PTO)

SpecAllis Chalmers HD21John Deere 8400TDifference
TypeNot recordedIndependent—
Speed 1Not recorded1,000rpm—

Hitch & Towing

SpecAllis Chalmers HD21John Deere 8400TDifference
Hitch TypeNot recordedThree-Point Hitch—
Hitch CategoryNot recordedCategory 3—
Hitch PositionNot recordedRear—
Hitch CapacityNot recorded15,650lb—

Chassis & Drive

SpecAllis Chalmers HD21John Deere 8400TDifference
Chassis TypeNot recordedCrawler—
Drive TypeNot recordedTrack—
Steering TypeNot recordedHydrostatic power—
Brake TypeNot recordedHydraulic wet disc—

Electrical

SpecAllis Chalmers HD21John Deere 8400TDifference
Starter TypeElectricElectricSame

Capacities

SpecAllis Chalmers HD21John Deere 8400TDifference
Coolant20gal9gal▲ HD21+11 gal · +122%

Operator Station

SpecAllis Chalmers HD21John Deere 8400TDifference
TypeNot recordedCab—

Category context

Both models against the field

Engine Power

median 110 hp
A · 84th percentile (225 hp)B · 85th percentile (227 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 · 92nd percentile (25,000 lb)
A · HD21B · 8400TMedian Agricultural Tractor
Full spec pageAllis Chalmers HD21Full spec pageJohn Deere 8400T