Compare/Allis Chalmers D21 Series I vs Allis Chalmers HD11

Allis Chalmers D21 Series I vs Allis Chalmers HD11

Verdict: Allis Chalmers D21 Series I vs Allis Chalmers HD11

The Allis Chalmers D21 Series I and the Allis Chalmers HD11 are both tractors — here is how they stack up on the figures that matter. Allis Chalmers HD11 leads on rated power with 110 hp against 103 hp. Allis Chalmers D21 Series I is the lighter machine (4,309 kg vs 21,000 kg), which helps on soft ground and transport, while the heavier model carries more ballast for traction-limited draft work. Allis Chalmers HD11 holds more fuel (227.1 L vs 196.8 L) for longer stints between fills. Allis Chalmers D21 Series I is the newer design (1963 vs 1955). In short: choose the Allis Chalmers HD11 for outright pulling power, or the Allis Chalmers D21 Series I if a tighter budget and lighter footprint matter more. Compare the full spec tables below before booking a demo.

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Acreage600 acBudgetMain crop / use

Fit & specs

Allis Chalmers

Fit score

Best match

Clear

Allis Chalmers

Fit score

Best match

Clear

Rated power

103 hp

110 hp

Confidence

40%

Guide price

—

Overview

Manufacturer

Allis ChalmersReference

With 18.4x34 rear tires.Reference

Gear 1 used for pull test.Reference

Total built

1,129Reference

—

Drive

—

crawlerReference

Engine

Fuel tank

196.8 LReference

227.1 LReference

Engine

88.7 kWReference

—

Drawbar (claimed)

69.4 kWReference

57.4 kWReference

Plows

7Reference

—

Drawbar (tested)

69.4 kWReference

55.0 kWReference

Displacement

7.0 LReference

8.5 LReference

Bore/Stroke

108 x 127 mmReference

113 x 141 mmReference

Power

88.7 kWReference

—

Air cleaner

dryReference

oil bathReference

Compression

16.0:1Reference

15.0:1Reference

Rated RPM

2200Reference

1800Reference

Firing order

1-5-3-6-2-4Reference

—

Coolant capacity

19.9 LReference

41.6 LReference

Intake valve clearance

0.381 mmReference

—

Exhaust valve clearance

0.381 mmReference

—

Oil capacity

87.1 LReference

16.1 LReference

Power at rated engine speed

76.9 kWReference

—

Max power

69.4 kWReference

55.0 kWReference

Engine (gross)

—

82.0 kWReference

Engine (net)

—

73.8 kWReference

Belt (claimed)

—

70.1 kWReference

Belt (tested)

—

66.9 kWReference

Power (net)

—

73.8 kWReference

Power (gross)

—

82.0 kWReference

Starter volts

—

24Reference

Belt power (max)

—

66.9 kWReference

Transmission

Power DirectorReference

—

Type

sliding gearReference

Gears

8 forward and 2 reverseReference

6 forward and 3 reverseReference

Clutch

dry discReference

—

PTO & Hydraulics

PTO (claimed)

76.8 kWReference

—

PTO (tested)

76.9 kWReference

—

Rear Type

III/IIReference

—

Rear PTO

independentReference

—

Rear PTO Type

1000Reference

—

Dimensions

Wheelbase

244 cmReference

—

Weight

4309 kgReference

21000 to 22200 poundsReference

Front tire

7.50x20Reference

—

Rear tire

18.4x34Reference

—

Ag front

11.00x16Reference

—

Ag rear

24.5x32Reference

—

Length

407 cmReference

391 cmReference

Width

232 cmReference

40 cmReference

Shipping weight

4309 kgReference

—

Ballasted weight

5307 kgReference

—

Clearance (front axle)

54 cmReference

—

Clearance (rear axle)

67 cmReference

—

Steering wheel

229 cmReference

—

Height (hood)

—

213 cmReference

Gauge

—

187 cmReference

HD11S Shipping

—

9525 kgReference

HD11ES Shipping

—

9933 kgReference

D21 Serial Numbers

1963

100 (Series I)Reference

7870Reference

1964

1417 (Series I)Reference

8606Reference

1965

2130 (Series II)Reference

10533Reference

1966

2408 (Series II)Reference

11451Reference

1967

2863 (Series II)Reference

—

1968

3777 (Series II)Reference

—

1969

4498 (Series II)Reference

—

Location:

Serial number on the left side of the Allis-Chalmers D21, stamped into the flange near the starter mounting.Reference

Serial number on the rear of the right-side final drive.Reference

Final

4609 (Series II)Reference

—

Electrical

Ground

negativeReference

positiveReference

Charging system

Delco-Remy generatorReference

—

Charging amps

32Reference

—

Batteries

4Reference

2Reference

Battery volts

12Reference

Battery AH

95Reference

—

Allis Chalmers D21 Height

Hood

182 cmReference

—

Exhaust

270 cmReference

—

Test results

Fuel use

26.9 l/hourReference

—

Max pull

6731 kgReference

9284 kgReference

Belt fuel use (max)

—

26.1 l/hourReference

Speeds

Variants

HD11S

—

6-roller agriculturalReference

HD11ES

—

7-roller agriculturalReference

HD11B

—

6-roller industrialReference

HD11 Serial Numbers

1955

—

101Reference

1956

—

1058Reference

1957

—

3255Reference

1958

—

4115Reference

1959

—

4768Reference

1960

—

5802Reference

1961

—

6448Reference

1962

—

6995Reference

Allis Chalmers HD11 Tracks

Length on ground

—

217 cmReference

Area on ground

—

1.8 m²Reference

HD11E width

—

40 cmReference

HD11E length on ground

—

244 cmReference

HD11E area on ground

—

2.0 m²Reference

Fit score weighs budget, operation size, crop match and data confidence against the details above. It’s guidance, not advice — always confirm with a dealer demo.