Head to head · Row Crop

Allis Chalmers D21 Series I vs John Deere 6506

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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
John Deere 6506 Tractor
John DeereModel B

John Deere 6506

Agricultural

power
105 hp
displacement
414 ci
Cylinders
6
Forward gears
24
Full 6506 specs
Allis ChalmersAllis Chalmers D21 Series I
vs
John DeereJohn Deere 6506

How they compare

Headline specs vs. the whole Row Crop

n = 1,140–1,417

Engine Power

▲ 6506 higher · +2 hp (+2%)
D21 Series I103 hp
6506105 hp
Median Row Crop Tractor138 hp

D21 Series I is in the 27th percentile; 6506 is in the 28th · 1,206 models

Engine Displacement

▲ D21 Series I higher · +12 ci (+3%)
D21 Series I426 ci
6506414 ci
Median Row Crop Tractor391 ci

D21 Series I is in the 72nd percentile; 6506 is in the 68th · 1,409 models

Cylinders

= Effectively tied
D21 Series I6
65066
Median Row Crop Tractor6

D21 Series I is in the 50th percentile; 6506 is in the 50th · 1,417 models

Forward Gears

▲ 6506 higher · +16 (+200%)
D21 Series I8
650624
Median Row Crop Tractor16

D21 Series I is in the 16th percentile; 6506 is in the 81st · 1,200 models

D21 Series I (A)6506 (B)Median Row Crop Tractor

Full comparison

Every spec, side by side

General Information

SpecAllis Chalmers D21 Series IJohn Deere 6506Difference
ManufacturerAllis ChalmersJohn Deere—
ModelD21 Series I6506—
CategoryRow CropAgricultural—

Engine

SpecAllis Chalmers D21 Series IJohn Deere 6506Difference
ManufacturerAllis ChalmersJohn Deere—
Model34006068—
Power Output103hp105hp▲ 6506+2 hp · +2%
Rated RPM2,200RPM2,300RPM▲ 6506+100 RPM · +5%
Cylinders66Same
Displacement426ci414ci▲ D21 Series I+12 ci · +3%
Bore4.3in4.2in▲ D21 Series I+0.1 in · +2%
Stroke5in5inSame

Transmission

SpecAllis Chalmers D21 Series IJohn Deere 6506Difference
TypeSliding gear with dry disc clutchPartial Power Shift—

Dimensions & Weight

SpecAllis Chalmers D21 Series IJohn Deere 6506Difference
Length161in177in▲ 6506+16 in · +10%
Width91.6inNot recorded—
Height107in111in▲ 6506+4 in · +4%
Operating Weight9,500lb10,250lb▲ 6506+750 lb · +8%

Hydraulics

SpecAllis Chalmers D21 Series IJohn Deere 6506Difference
Steering TypePowerNot recorded—

Power Take-off (PTO)

SpecAllis Chalmers D21 Series IJohn Deere 6506Difference
TypeIndependentNot recorded—
Speed 11,000rpmNot recorded—

Hitch & Towing

SpecAllis Chalmers D21 Series IJohn Deere 6506Difference
Hitch TypeThree-Point HitchNot recorded—
Hitch CategoryIII/IICategory 3—
Hitch PositionRearNot recorded—

Chassis & Drive

SpecAllis Chalmers D21 Series IJohn Deere 6506Difference
Chassis Type4x2 2WDNot recorded—
Drive Type2WDNot recorded—
Steering TypePowerNot recorded—
Brake TypeBand actuated discNot recorded—

Electrical

SpecAllis Chalmers D21 Series IJohn Deere 6506Difference
Starter TypeElectricElectricSame

Capacities

SpecAllis Chalmers D21 Series IJohn Deere 6506Difference
Coolant5.3galNot recorded—

Operator Station

SpecAllis Chalmers D21 Series IJohn Deere 6506Difference
TypeOpenNot recorded—

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 · 68th percentile (414 ci)

Cylinders

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

Forward Gears

median 16
A · 16th percentile (8)B · 81st percentile (24)

Operating Weight

median 12,307 lb
A · 28th percentile (9,500 lb)B · 33rd percentile (10,250 lb)
A · D21 Series IB · 6506Median Row Crop Tractor
Full spec pageAllis Chalmers D21 Series IFull spec pageJohn Deere 6506