Allis Chalmers HD20

The Allis Chalmers HD20 is a tractor produced by Allis Chalmers. It is equipped with a 660 ci 10.8 L engine. The listed engine power is Diesel (net): 175 hp / 130.5 kW. Transmission: 2 forward and 1 reverse. Drive type: crawler. Operating weight: 41000 lbs 18597 kg.

Engine Power

Diesel (net): 175 hp / 130.5 kW

Drive & Traction

crawler

Fuel & Capacities

120 gal 454.2 L

Transmission

2 forward and 1 reverse

Operating Weight

41000 lbs 18597 kg

Overview

	1951 - 1954 Agricultural Crawler tractor

Production
Manufacturer	Allis Chalmers
Agricultural Crawler tractor
Built in Springfield, Illinois, USA
Total built	3,100

Allis Chalmers HD20 Engine
General Motors 10.8L 6-cyl diesel
Fuel tank	120 gal 454.2 L
Engine details ...

Allis Chalmers HD20 Transmission
2-speed torque converter
Transmission details ...

Allis Chalmers HD20 Power
Engine (net)	175 hp 130.5 kW
Drawbar (claimed)	117 hp 87.2 kW
Drawbar (tested)	116.7 hp 87.0 kW
Performance test details ...

Mechanical
Drive	crawler
Open operator station.

Dimensions & Tracks
Weight	41000 lbs 18597 kg
Tracks
Full dimensions and tracks ...

Engine

Engine Detail — 660 ci / 10.8 L Diesel

Manufacturer	General Motors
Configuration	6-cylinder, liquid-cooled 2-cycle vertical I-head
blower diesel
Displacement	660 ci 10.8 L
Bore/Stroke	5.00x5.60 inches 127 x 142 mm
Power (net)	175 hp 130.5 kW
Compression	18.0:1
Rated RPM	1700
Starter volts	24
Coolant capacity	60 qts 56.8 L

Transmission

Transmission — 2 forward and 1 reverse torque converter

Type	torque converter
Gears	2 forward and 1 reverse

Dimensions

Allis Chalmers HD20 Tracks

Dimensions
Length	191 inches 485 cm
Height	95 inches 241 cm
Weight	41000 lbs 18597 kg

Tests

Nebraska Tractor Test 465
July 1951
Drawbar performance
Max power	116.7 hp 87.0 kW
Max pull	30,464 lbs 13818 kg

Photos

Allis Chalmers HD20

Recommended Implements & Sizing Guide

Engineering recommendations for Allis Chalmers HD20 based on its 175 HP power envelope and ASAE agricultural standards.

Implement & Operation	Recommended Size	Workload Rating	Engineering Notes
Moldboard PlowPrimary Tillage	5 to 7 Bottom (18")5 - 7 铧 (45 cm)	Commercial / Field Scale	Large acreage tillage; requires front ballast weights.
Rotary Cutter / MowerMowing & Clearing	15 to 20 ft Batwing4.6 - 6.1 m 宽幅折叠翼	Commercial / Field Scale	Large commercial field and roadside mowing operations.
Rotary TillerSeedbed Prep	90 to 120 in Heavy Duty230 - 300 cm 重型旋耕机	Commercial / Field Scale	Deep intensive seedbed preparation for commercial row crops.
Disc HarrowSecondary Tillage	15 to 22 ft Folding Disc4.5 - 6.7 m 折叠式圆盘耙	Commercial / Field Scale	Wide commercial field leveling; requires hydraulic remotes.
Hay BalerHay & Forage	Large Square Baler (3x4 or 4x4)大方捆商用打捆机 (1.2x1.2 m)	Commercial / Field Scale	High-capacity commercial forage harvesting (1000 RPM PTO).

Sizing & Soil Condition NoteActual implement sizing varies depending on local soil conditions (heavy clay vs sandy loam), field slope, and operating speed. Heavy tillage implements may require front ballast weights and wheel weights.

Fluids, Capacities & Working Autonomy

Standard fluid requirements, service intervals, and continuous runtime estimates for Allis Chalmers HD20.

Estimated Continuous Field Runtime: 13.2 hrs

Approximately 13.2 hours of continuous field operation at ~75% rated power on a full tank (120 gal / 454.2 L).

Estimated 75% Load Fuel Burn~9.1 gal/hr (34.4 L/hr)

Engine Crankcase Oil

SAE 15W-40 (Heavy Duty Diesel)

Standard Spec: API CK-4 / CJ-4 Heavy Duty

Service Interval: 150 – 250 Hours

Transmission & Hydraulic System

UTTO (Universal Tractor Transmission Oil)

Standard Spec: ISO VG 46 / 68 (Wet Brake & Trans Compatible)

Service Interval: 600 – 1000 Hours

Engine Cooling System

50/50 Ethylene Glycol Pre-mix

Standard Spec: ASTM D6210 / Heavy-Duty OAT Antifreeze

Service Interval: 2 Years / 1500 Hours