Head to head · Row Crop

Allis Chalmers D21 Series I vs John Deere 6615

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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 6615

Utility

power
105 hp
displacement
414 ci
Cylinders
6
Forward gears
16
Full 6615 specs
Allis ChalmersAllis Chalmers D21 Series I
vs
John DeereJohn Deere 6615

How they compare

Headline specs vs. the whole Row Crop

n = 1,140–1,417

Engine Power

▲ 6615 higher · +2 hp (+2%)
D21 Series I103 hp
6615105 hp
Median Row Crop Tractor138 hp

D21 Series I is in the 27th percentile; 6615 is in the 29th · 1,206 models

Engine Displacement

▲ D21 Series I higher · +12 ci (+3%)
D21 Series I426 ci
6615414 ci
Median Row Crop Tractor391 ci

D21 Series I is in the 72nd percentile; 6615 is in the 66th · 1,409 models

Cylinders

= Effectively tied
D21 Series I6
66156
Median Row Crop Tractor6

D21 Series I is in the 50th percentile; 6615 is in the 50th · 1,417 models

Forward Gears

▲ 6615 higher · +8 (+100%)
D21 Series I8
661516
Median Row Crop Tractor16

D21 Series I is in the 16th percentile; 6615 is in the 50th · 1,200 models

D21 Series I (A)6615 (B)Median Row Crop Tractor

Full comparison

Every spec, side by side

General Information

SpecAllis Chalmers D21 Series IJohn Deere 6615Difference
ManufacturerAllis ChalmersJohn Deere—
ModelD21 Series I6615—
CategoryRow CropUtility—

Engine

SpecAllis Chalmers D21 Series IJohn Deere 6615Difference
ManufacturerAllis ChalmersJohn Deere—
Model34006068T—
Power Output103hp105hp▲ 6615+2 hp · +2%
Rated RPM2,200RPM2,300RPM▲ 6615+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 6615Difference
TypeSliding gear with dry disc clutchFully synchronized, Power shuttle, Four-speed power shift—

Dimensions & Weight

SpecAllis Chalmers D21 Series IJohn Deere 6615Difference
Length161in177in▲ 6615+16 in · +10%
Width91.6inNot recorded—
Height107in108in▲ 6615+1 in · <1%
Operating Weight9,500lb10,670lb▲ 6615+1,170 lb · +12%

Hydraulics

SpecAllis Chalmers D21 Series IJohn Deere 6615Difference
System TypeNot recordedConstant-flow load-sensing—
Steering TypePowerHydrostatic power—

Power Take-off (PTO)

SpecAllis Chalmers D21 Series IJohn Deere 6615Difference
TypeIndependentIndependentSame
Speed 11,000rpm540rpm▲ D21 Series I+460 rpm · +85%
Speed 2Not recorded1,000rpm—

Hitch & Towing

SpecAllis Chalmers D21 Series IJohn Deere 6615Difference
Hitch TypeThree-Point HitchNot recorded—
Hitch CategoryIII/IICategory 2—
Hitch PositionRearRearSame
Hitch CapacityNot recorded6,475lb—

Chassis & Drive

SpecAllis Chalmers D21 Series IJohn Deere 6615Difference
Chassis Type4x2 2WD4x4 MFWD 4WD—
Drive Type2WD4WD—
Steering TypePowerHydrostatic power—
Brake TypeBand actuated discHydraulic wet disc—

Electrical

SpecAllis Chalmers D21 Series IJohn Deere 6615Difference
Starter TypeElectricElectricSame

Capacities

SpecAllis Chalmers D21 Series IJohn Deere 6615Difference
Coolant5.3gal3.4gal▲ D21 Series I+1.9 gal · +56%

Operator Station

SpecAllis Chalmers D21 Series IJohn Deere 6615Difference
TypeOpenTwo-post foldable ROPS or ComfortVantage Cab (optional)—

Category context

Both models against the field

Engine Power

median 138 hp
A · 27th percentile (103 hp)B · 29th percentile (105 hp)

Engine Displacement

median 391 ci
A · 72nd percentile (426 ci)B · 66th percentile (414 ci)

Cylinders

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

Forward Gears

median 16
A · 16th percentile (8)B · 50th percentile (16)

Operating Weight

median 12,307 lb
A · 28th percentile (9,500 lb)B · 36th percentile (10,670 lb)
A · D21 Series IB · 6615Median Row Crop Tractor
Full spec pageAllis Chalmers D21 Series IFull spec pageJohn Deere 6615