Head to head · Row Crop

Allis Chalmers D21 Series I vs John Deere 6403

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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
Image not recorded
John DeereModel B

John Deere 6403

Utility

power
102 hp
displacement
276 ci
Cylinders
4
Forward gears
9
Full 6403 specs
Allis ChalmersAllis Chalmers D21 Series I
vs
John DeereJohn Deere 6403

How they compare

Headline specs vs. the whole Row Crop

n = 806–1,417

Engine Power

▲ D21 Series I higher · +1 hp (<1%)
D21 Series I103 hp
6403102 hp
Median Row Crop Tractor138 hp

D21 Series I is in the 27th percentile; 6403 is in the 26th · 1,206 models

Engine Displacement

▲ D21 Series I higher · +150 ci (+54%)
D21 Series I426 ci
6403276 ci
Median Row Crop Tractor391 ci

D21 Series I is in the 72nd percentile; 6403 is in the 25th · 1,409 models

Cylinders

▲ D21 Series I higher · +2 (+50%)
D21 Series I6
64034
Median Row Crop Tractor6

D21 Series I is in the 50th percentile; 6403 is in the 17th · 1,417 models

Forward Gears

▲ 6403 higher · +1 (+13%)
D21 Series I8
64039
Median Row Crop Tractor16

D21 Series I is in the 16th percentile; 6403 is in the 20th · 1,200 models

D21 Series I (A)6403 (B)Median Row Crop Tractor

Full comparison

Every spec, side by side

General Information

SpecAllis Chalmers D21 Series IJohn Deere 6403Difference
ManufacturerAllis ChalmersJohn Deere—
ModelD21 Series I6403—
CategoryRow CropUtility—

Engine

SpecAllis Chalmers D21 Series IJohn Deere 6403Difference
ManufacturerAllis ChalmersJohn Deere—
Model3400Not recorded—
Power Output103hp102hp▲ D21 Series I+1 hp · <1%
Rated RPM2,200RPM2,100RPM▲ D21 Series I+100 RPM · +5%
Cylinders64▲ D21 Series I+2 · +50%
Displacement426ci276ci▲ D21 Series I+150 ci · +54%
Bore4.3in4.2in▲ D21 Series I+0.1 in · +2%
Stroke5in5inSame

Transmission

SpecAllis Chalmers D21 Series IJohn Deere 6403Difference
TypeSliding gear with dry disc clutchPartially synchronized—

Dimensions & Weight

SpecAllis Chalmers D21 Series IJohn Deere 6403Difference
Length161in163in▲ 6403+2 in · +1%
Width91.6in73in▲ D21 Series I+18.6 in · +25%
Height107in109in▲ 6403+2 in · +2%
Operating Weight9,500lb8,987lb▲ D21 Series I+513 lb · +6%

Hydraulics

SpecAllis Chalmers D21 Series IJohn Deere 6403Difference
System TypeNot recordedOpen center—
Steering TypePowerPowerSame

Power Take-off (PTO)

SpecAllis Chalmers D21 Series IJohn Deere 6403Difference
TypeIndependentIndependentSame
Speed 11,000rpm540rpm▲ D21 Series I+460 rpm · +85%
Speed 2Not recorded1,000rpm—

Hitch & Towing

SpecAllis Chalmers D21 Series IJohn Deere 6403Difference
Hitch TypeThree-Point HitchThree-Point HitchSame
Hitch CategoryIII/IIII—
Hitch PositionRearRearSame
Hitch CapacityNot recorded4,830lb—

Chassis & Drive

SpecAllis Chalmers D21 Series IJohn Deere 6403Difference
Chassis Type4x2 2WD4x4 MFWD 4WD—
Drive Type2WDMFWD 4WD—
Steering TypePowerPowerSame
Brake TypeBand actuated discMechanical wet disc—

Electrical

SpecAllis Chalmers D21 Series IJohn Deere 6403Difference
Starter TypeElectricElectricSame

Capacities

SpecAllis Chalmers D21 Series IJohn Deere 6403Difference
Coolant5.3gal3.6gal▲ D21 Series I+1.7 gal · +47%

Operator Station

SpecAllis Chalmers D21 Series IJohn Deere 6403Difference
TypeOpenTwo-post folding ROPS—

Category context

Both models against the field

Engine Power

median 138 hp
A · 27th percentile (103 hp)B · 26th percentile (102 hp)

Engine Displacement

median 391 ci
A · 72nd percentile (426 ci)B · 25th percentile (276 ci)

Cylinders

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

Forward Gears

median 16
A · 16th percentile (8)B · 20th percentile (9)

Operating Weight

median 12,307 lb
A · 28th percentile (9,500 lb)B · 26th percentile (8,987 lb)
A · D21 Series IB · 6403Median Row Crop Tractor
Full spec pageAllis Chalmers D21 Series IFull spec pageJohn Deere 6403