Compare/Allis Chalmers 840 vs Allis Chalmers HD-6G

Allis Chalmers 840 vs Allis Chalmers HD-6G

Verdict: Allis Chalmers 840 vs Allis Chalmers HD-6G

The Allis Chalmers 840 and the Allis Chalmers HD-6G are both industrial tractors — here is how they stack up on the figures that matter. Allis Chalmers 840 leads on rated power with 83 hp against 80 hp. Allis Chalmers 840 is the lighter machine (6,645 kg vs 9,525 kg), which helps on soft ground and transport, while the heavier model carries more ballast for traction-limited draft work. Allis Chalmers 840 is the newer design (1970 vs 1956). In short: choose the Allis Chalmers 840 for outright pulling power, or the Allis Chalmers HD-6G 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

83 hp

80 hp

Confidence

40%

Guide price

—

Overview

Manufacturer

Allis ChalmersReference

liquid-cooled inlineReference

liquid-cooledReference

Final drives

planetaryReference

—

Drive

—

crawlerReference

Engine

Engine (gross)

61.9 kWReference

59.7 kWReference

Displacement

4.1 LReference

5.6 LReference

Bore/Stroke

101 x 127 mmReference

113 x 141 mmReference

Power (gross)

61.9 kWReference

59.7 kWReference

Compression

16:1Reference

—

Rated RPM

2500Reference

1800Reference

Idle RPM

700-2700Reference

—

Torque

271.2 NmReference

—

Torque RPM

1400Reference

—

Starter

electricReference

Starter volts

12Reference

24Reference

Oil capacity

18.9 LReference

Coolant capacity

18.9 LReference

31.2 LReference

Engine (net)

—

53.7 kWReference

Power (net)

—

53.7 kWReference

Transmission

Gears

3 forward and reverseReference

4 forward and 2 reverseReference

Clutch

—

wet discReference

Capacities

Fuel

128.7 LReference

151.4 LReference

PTO & Hydraulics

Hydraulic system

113.6 LReference

102.2 LReference

Type

power shiftReference

gearReference

Capacity

113.6 LReference

102.2 LReference

Pressure

155.1 barReference

—

Pump flow

113.6 lpmReference

151.4 lpmReference

Steering flow

46.2 lpmReference

—

Steering press.

103.4 barReference

—

Dimensions

Wheelbase

243 cmReference

—

Weight

6645 kgReference

9525 kgReference

Length

530 cmReference

446 cmReference

Height (steering wheel)

240 cmReference

187 cmReference

Height (exhaust)

251 cmReference

200 cmReference

Operating weight

6645 kgReference

—

Front tread

170 cmReference

—

Rear tread

170 cmReference

—

Shipping weight

—

9525 kgReference

Ripper

—

703 kgReference

Gauge

—

152 cmReference

Allis Chalmers 840 attachments

Electrical

Ground

negativeReference

—

Charging system

alternatorReference

—

Charging amps

55Reference

—

Battery volts

12Reference

—

Battery AH

95Reference

—

Variants

HD6A

—

44-inch gaugeReference

HD6B

—

60-inch gaugeReference

HD6E

—

5-rollerReference

HD6G

—

loaderReference

HD6EP

—

power shiftReference

HD6AG

—

turbochargedReference

Allis Chalmers HD-6G attachments

Allis Chalmers HD-6G Tracks

Width

—

198 cmReference

Length on ground

—

212 cmReference

Area on ground

—

1.4 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.