Allis Chalmers lawn tractors

Allis Chalmers 720

The Allis Chalmers 720 is a garden tractor built by Simplicity and distributed by Allis Chalmers from 1975 to 1980. It features a 19.5 hp Onan 816cc 2-cylinder air-cooled gasoline engine, hydrostatic transmission by Sundstrand with infinite forward and reverse speeds in 3 ranges, and two-wheel drive with manual steering and disc brakes. The tractor has an open operator station and is built in Port Washington, Wisconsin, USA. It has a fuel capacity of 3.8 gallons and a hydraulic system capacity of 1.5 gallons with 500 psi pressure. The 720 supports independent front and rear PTOs with electric clutches. Dimensions include a 56 inch wheelbase, 83 inch length, 48 inch width, and 43.25 inch height, weighing 1300 lbs. Tires are available in agricultural and lawn/turf sizes. Attachments include a 60" mid-mount mower deck, snowblower, blade, front-end loader, and backhoe. Variants include the 720 Special economy model and the similar Simplicity 9020.

Power19 hp

Founded60" deck

Model720

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Technical Specifications

Detailed specifications and technical data for Allis Chalmers 720

Power

Power (gross)	19.5 hp (14.5 kW)

Tires

Ag rear	8.00-16
Ag front	4.00x12
Lawn/turf rear	29x12.00-15
Lawn/turf front	20x8.00-10
Lawn/turf rear (alt)	31x15.50-15
Lawn/turf front (alt)	6.90/6.00-9

Engine

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

Capacity

Fuel	3.8 gal (14.4 L)
Hydraulic system	1.5 gal (5.7 L)

Variants

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

Dimensions

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

Electrical

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

Hydraulics

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

Mechanical

Drive	Two-wheel drive
Brakes	Disc brakes
Steering	Manual steering
Operator station	Open operator station

Production

Type	Garden tractor
Built in	Port Washington, Wisconsin, USA
Distributor	Allis Chalmers
Manufacturer	Simplicity
Production years	1975 - 1980

Attachments

Overview	60" mid-mount mower deck, snowblower, blade, front-end loader, backhoe
60" Blade	Allis Chalmers front-mount, 60 inches width (152 cm), 225 lbs (102 kg), hydraulic-lift
60" Mower deck	mid-mount Allis Chalmers, 3-blade, 60 inches (152 cm) cutting width
52" Snow blower	Allis Chalmers, 52 inches width (132 cm), single-stage, front-mount, 340 lbs (154 kg)
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)
Simplicity 1690112 Loader	built by Ark, 400 lbs lift (full at pin) (181 kg), 650 lbs breakout (294 kg), 45° dump, 24.75 inches reach (dumped) (62 cm), 52 inches reach (ground) (132 cm), 8° rollback (ground line), 85 inches height (at pin) (215 cm), 66.5 inches clearance (dumped) (168 cm), Bucket width: 40 inches (101 cm) and 48 inches (121 cm)
Simplicity 1690157 Loader	built by Ark, 400 lbs lift (full at pin) (181 kg), 650 lbs breakout (294 kg), 43° dump, 23.5 inches reach (dumped) (59 cm), 51.5 inches reach (ground) (130 cm), 8° rollback (ground line), 86.5 inches height (at pin) (219 cm), 69 inches clearance (dumped) (175 cm), Bucket width: 48 inches (121 cm)