Compare/Allis Chalmers 6140 vs Allis Chalmers K

Allis Chalmers 6140 vs Allis Chalmers K

Verdict: Allis Chalmers 6140 vs Allis Chalmers K

The Allis Chalmers 6140 and the Allis Chalmers K are both tractors — here is how they stack up on the figures that matter. Allis Chalmers 6140 leads on rated power with 40 hp against 36 hp. Allis Chalmers 6140 is the lighter machine (4,000 kg vs 5,216 kg), which helps on soft ground and transport, while the heavier model carries more ballast for traction-limited draft work. Allis Chalmers K holds more fuel (147.6 L vs 50.0 L) for longer stints between fills. Allis Chalmers 6140 is the newer design (1982 vs 1929). In short: choose the Allis Chalmers 6140 for outright pulling power, or the Allis Chalmers K if a tighter budget and lighter footprint matter more. Compare the full spec tables below before booking a demo.

Tune the fit score

Tell us about your operation

Acreage600 acBudgetMain crop / use

Fit & specs

Allis Chalmers

Fit score

Best match

Clear

Allis Chalmers

Fit score

Best match

Clear

Rated power

40 hp

36 hp

Confidence

40%

Guide price

—

Overview

Manufacturer

Allis ChalmersReference

liquid-cooledReference

The four-speed transmission was introduced in 1935 at tractor serial number 4451.Reference

Original price

$15,891Reference

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Final drives

inboard planetaryReference

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Differential lock

mechanical rearReference

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Total built

—

9,468Reference

Drive

—

crawlerReference

Engine

Fuel tank

50.0 LReference

147.6 LReference

Displacement

2.3 LReference

8.4 LReference

Bore/Stroke

98 x 103 mmReference

127 x 165 mmReference

Air cleaner

dryReference

oil bathReference

Pre-heating

glow plugsReference

—

Compression

23:1Reference

5.2:1Reference

Rated RPM

2500Reference

1050Reference

Starter volts

12Reference

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Coolant capacity

8.0 LReference

41.6 LReference

Drawbar (claimed)

—

26.5 kWReference

Belt (claimed)

—

36.8 kWReference

Drawbar (tested)

—

40.0 kWReference

Belt (tested)

—

46.4 kWReference

Belt power (max)

—

46.4 kWReference

Max power

—

40.0 kWReference

Transmission

Gears

10 forward and 2 reverseReference

4 forward and 1 reverseReference

Clutch

279.4mm dry discReference

—

Oil capacity

—

20.8 LReference

PTO & Hydraulics

PTO (claimed)

29.8 kWReference

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Type

synchromeshReference

gearReference

Pump flow

37.9 lpmReference

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Rear Type

IReference

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Control

top-link draft sensingReference

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Rear lift

1446 kgReference

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Rear PTO

independentReference

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Rear PTO Type

540 (1.375)Reference

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Dimensions

Wheelbase

193 cmReference

—

Weight

4000 to 4400 poundsReference

5216 kgReference

Front tire

6.00-16Reference

—

Rear tire

13.6-28Reference

—

Ag front

8.00-18Reference

—

Ag rear

14.9-28Reference

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Length

334 cmReference

314 cmReference

Width

173 cmReference

38 cmReference

2WD Shipping weight

1814 kgReference

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4WD Shipping weight

1995 kgReference

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Front tread

126 to 198 cmReference

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Rear tread

137 to 213 cmReference

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Steering wheel

159 cmReference

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K Width

—

167 cmReference

Height (hood)

—

162 cmReference

K Gauge

—

121 cmReference

WK Gauge

—

160 cmReference

Allis Chalmers 6140 attachments

6140 Serial Numbers

1982

1001Reference

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1983

1726Reference

—

1984

1851Reference

—

1985

2711Reference

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Location:

Serial number on the left side of the fuel tank.Reference

Serial number on the transmission case or instrument panelReference

Electrical

Ground

negativeReference

—

Battery volts

12Reference

—

Allis Chalmers 6140 Height

Hood

128 cmReference

—

Exhaust

223 cmReference

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Variants

—

gasolineReference

—

wide gasReference

—

dieselReference

WKO

—

wide dieselReference

K Serial Numbers

1929

—

1Reference

1930

—

49Reference

1931

—

1373Reference

1932

—

2334Reference

1933

—

2654Reference

1934

—

3046Reference

1935

—

3594Reference

1936

—

4793Reference

Allis Chalmers K Tracks

Length on ground

—

170 cmReference

Area on ground

—

1.3 m²Reference

Ground pressure

—

0.4 barReference

Test results

Belt fuel use (max)

—

23.5 l/hourReference

Max pull

—

5345 kgReference

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.