Head to head · Row Crop

Allis Chalmers D21 Series I vs Kubota M108S

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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
KubotaModel B

Kubota M108S

Row Crop

power
103 hp
displacement
230 ci
Cylinders
4
Forward gears
16
Full M108S specs
Allis ChalmersAllis Chalmers D21 Series I
vs
KubotaKubota M108S

How they compare

Headline specs vs. the whole Row Crop

n = 806–1,417

Engine Power

= Effectively tied
D21 Series I103 hp
M108S103 hp
Median Row Crop Tractor138 hp

D21 Series I is in the 27th percentile; M108S is in the 27th · 1,206 models

Engine Displacement

▲ D21 Series I higher · +196 ci (+85%)
D21 Series I426 ci
M108S230 ci
Median Row Crop Tractor391 ci

D21 Series I is in the 72nd percentile; M108S is in the 12th · 1,409 models

Cylinders

▲ D21 Series I higher · +2 (+50%)
D21 Series I6
M108S4
Median Row Crop Tractor6

D21 Series I is in the 50th percentile; M108S is in the 17th · 1,417 models

Forward Gears

▲ M108S higher · +8 (+100%)
D21 Series I8
M108S16
Median Row Crop Tractor16

D21 Series I is in the 16th percentile; M108S is in the 50th · 1,200 models

D21 Series I (A)M108S (B)Median Row Crop Tractor

Full comparison

Every spec, side by side

General Information

SpecAllis Chalmers D21 Series IKubota M108SDifference
ManufacturerAllis ChalmersKubota—
ModelD21 Series IM108S—
CategoryRow CropRow CropSame

Engine

SpecAllis Chalmers D21 Series IKubota M108SDifference
ManufacturerAllis ChalmersKubota—
Model3400V3800-DT-TI—
Power Output103hp103hpSame
Rated RPM2,200RPM2,600RPM▲ M108S+400 RPM · +18%
Cylinders64▲ D21 Series I+2 · +50%
Displacement426ci230ci▲ D21 Series I+196 ci · +85%
Bore4.3in3.9in▲ D21 Series I+0.4 in · +10%
Stroke5in4.7in▲ D21 Series I+0.3 in · +6%

Transmission

SpecAllis Chalmers D21 Series IKubota M108SDifference
TypeSliding gear with dry disc clutch16-speed selective gear fixed ratio—

Dimensions & Weight

SpecAllis Chalmers D21 Series IKubota M108SDifference
Length161in160in▲ D21 Series I+1 in · <1%
Width91.6in91in▲ D21 Series I+0.6 in · <1%
Height107in106in▲ D21 Series I+1 in · <1%
Operating Weight9,500lb8,780lb▲ D21 Series I+720 lb · +8%

Hydraulics

SpecAllis Chalmers D21 Series IKubota M108SDifference
System TypeNot recordedOpen center—
Pump Flow CapacityNot recorded16gpm—
PressureNot recorded2,812psi—
Steering TypePowerHydrostatic power—

Power Take-off (PTO)

SpecAllis Chalmers D21 Series IKubota M108SDifference
TypeIndependentIndependentSame
Speed 11,000rpm540rpm▲ D21 Series I+460 rpm · +85%

Hitch & Towing

SpecAllis Chalmers D21 Series IKubota M108SDifference
Hitch TypeThree-Point HitchThree-Point HitchSame
Hitch CategoryIII/IIII—
Hitch PositionRearNot recorded—
Hitch CapacityNot recorded5,765lb—

Chassis & Drive

SpecAllis Chalmers D21 Series IKubota M108SDifference
Chassis Type4x2 2WD4x4 MFWD 4WD—
Drive Type2WDNot recorded—
Steering TypePowerHydrostatic power—
Brake TypeBand actuated discHydraulic wet disc—

Electrical

SpecAllis Chalmers D21 Series IKubota M108SDifference
Starter TypeElectricElectricSame

Capacities

SpecAllis Chalmers D21 Series IKubota M108SDifference
Coolant5.3gal2.4gal▲ D21 Series I+2.9 gal · +121%

Operator Station

SpecAllis Chalmers D21 Series IKubota M108SDifference
TypeOpenROPS or Cab with heat and A/C (optional)—

Category context

Both models against the field

Engine Power

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

Engine Displacement

median 391 ci
A · 72nd percentile (426 ci)B · 12th percentile (230 ci)

Cylinders

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

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 · 25th percentile (8,780 lb)
A · D21 Series IB · M108SMedian Row Crop Tractor
Full spec pageAllis Chalmers D21 Series IFull spec pageKubota M108S