Allis Chalmers 720

The Allis Chalmers 720 is a tractor produced by Allis Chalmers Lawn Tractors. It is equipped with a 816 cc 49.8 ci engine. The listed engine power is Gasoline (gross): 19.5 hp / 14.5 kW. Transmission: infinite forward and reverse (3-range). Operating weight: 925 lbs 419 kg.

Engine Power

Gasoline (gross): 19.5 hp / 14.5 kW

Fuel & Capacities

3.8 gal 14.4 L

Transmission

infinite forward and reverse (3-range)

Operating Weight

925 lbs 419 kg

Overview

	1975 - 1980 Garden tractorSimplicity built Garden tractor Simplicity built

Production
Distributor	Allis Chalmers
Manufacturer	Simplicity
Garden tractor
Built in Port Washington, Wisconsin, USA

Variants
720 Special	economy model with no 3-point or rear PTO
9020	similar Simplicity model

Allis Chalmers 720 Engine
19.5HP Onan 816cc 2-cyl gasoline
Engine details ...

Allis Chalmers 720 Transmission
hydrostatic
Transmission details ...

Mechanical
Two-wheel drive
Manual steering
Disc brakes
Open operator station.

Capacity
Fuel	3.8 gal 14.4 L
Hydraulic system	1.5 gal 5.7 L

Hydraulics
Capacity	1.5 gal 5.7 L
Pressure	500 psi 34.5 bar
Pump flow	2.5 gpm 9.5 lpm

Tractor hitch
Rear Type	0

Power Take-off (PTO)
Rear PTO	independent
Clutch	electric
Rear PTO Type	2000
Front PTO	independent
Clutch	electric
Front PTO Type	3600

Dimensions & Tires
Wheelbase	56 inches 142 cm
Weight	1300 lbs 589 kg
Front tire	20x8.00-10
Rear tire	29x12.00-15
Full dimensions and tires ...

Electrical
Ground	negative
Charging system	flywheel magneto
Charging amps	20
Battery volts	12
Battery AH	53

References

1974 Buyer's Guide published by Allis-Chalmers
Allis-Chalmers Lawn and Garden Equipment published in 1975

Engine

Engine Detail — 816 cc / 49.8 ci Gasoline

Manufacturer	Onan CCKB
Fuel Type	Gasoline
Configuration	2-cylinder, air-cooled horizontal-shaft opposed-twin
Displacement	816 cc 49.8 ci
Bore/Stroke	3.25x3.00 inches 83 x 76 mm
Power (gross)	19.5 hp 14.5 kW
Air cleaner	paper element
Compression	7:1
Rated RPM	3600
Starter volts	12
Oil capacity	3.5 qts 3.3 L

Allis Chalmers 720 Engine

Image courtesy of Mike Meyer

Transmission

Transmission — infinite forward and reverse (3-range) hydrostatic

Manufacturer	Sundstrand
Type	hydrostatic
Gears	infinite forward and reverse (3-range)
Oil capacity	6 qts 5.7 L
With 29x12.00-15 R3 tires.

Dimensions

Allis Chalmers 720 Tires
Ag front	4.00x12
Ag rear	8.00-16
Lawn/turf front	20x8.00-10
Lawn/turf rear	29x12.00-15
Lawn/turf front	6.90/6.00-9
Lawn/turf rear	31x15.50-15

Dimensions
Wheelbase	56 inches 142 cm
Length	83 inches 210 cm
Width	48 inches 121 cm
Height	43.25 inches 109 cm
Shipping weight	1300 lbs 589 kg
Ground clearance	15 inches 38 cm

Attachments

Attachment overview
60" mid-mount mower deck
Snowblower
Blade
Front-end loader
Backhoe
Garden tractors are capable of using tillers, plows, or other ground-engaging attachments. TractorData does not list details of these attachments.

60" Mower deck
Type	mid-mount Allis Chalmers
	3-blade
Cutting width	60 inches 152 cm

Brantly LD6 Backhoe
Backhoe type	Brantly LD6 Backhoe
Weight	925 lbs 419 kg
Transport height	72 inches 182 cm
Bucket width	8 inches 20 cm
	13 inches 33 cm
	16 inches 40 cm
2-Foot flat digging depth	72 inches 182 cm
Reach from pivot	108 inches 274 cm
Swing Arc	135°
Bucket force	3000 lbs 1360 kg
Dipperstick force	1560 lbs 707 kg

Photos

Allis-Chalmers 720 with mid-mount mower deck.

Allis-Chalmers 720 operator station and controls.

Onan CCKB engine in an Allis-Chalmers 720.

Allis-Chalmers 720 with plow and front blade.

Recommended Implements & Sizing Guide

Engineering recommendations for Allis Chalmers Lawn Tractors Allis Chalmers 720 based on its 19.5 HP power envelope and ASAE agricultural standards.

Implement & Operation	Recommended Size	Workload Rating	Engineering Notes
Moldboard PlowPrimary Tillage	1 to 2 Bottom (12")1 - 2 铧 (30 cm)	Light Duty	Ideal for garden plots and light sandy soil.
Rotary Cutter / MowerMowing & Clearing	4 ft (48 in)1.2 m	Light Duty	Pasture clipping and light brush under 1" diameter.
Rotary TillerSeedbed Prep	42 to 48 in105 - 120 cm	Light Duty	Covers compact tractor tire width.

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 Lawn Tractors Allis Chalmers 720.

Estimated Continuous Field Runtime: 3.7 hrs

Approximately 3.7 hours of continuous field operation at ~75% rated power on a full tank (3.8 gal / 14.4 L).

Estimated 75% Load Fuel Burn~1 gal/hr (3.8 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

Allis Chalmers Lawn Tractors Allis Chalmers 720 Specification Unit Converter

Convert power, fluid capacities, and operating weights between metric and imperial standards for Allis Chalmers Lawn Tractors Allis Chalmers 720.

Enter value:

Unit:

Converted Equivalents:

Horsepower (HP)19.5 hp

Kilowatts (kW)14.5 kW

Metric Horsepower (PS / CV)19.8 PS

Direct Competitor Comparison

Compare Allis Chalmers 720 against same-era industry alternatives in the same horsepower class.

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