Ryan® Lawnaire® 28 Aerator

Model Number	544874D
Engine	4-cycle, Briggs & Stratton® Vanguardª recoil starter; on/off switch; muffler
Horsepower (@3,600 rpm)	7.5-hp (5.6 kW)
Displacement	13.1 cu. in. (215 cc)
Oil Capacity	1 qt. (.9 l)
Drive	Gear box with differential type

Unit

Machine Type	Reciprocating self-propelled walk-behind aerator
Clutch	Belt Tightener

Drive

Wheel	A-section V-belt, #40 O-ring-sealed roller chain
Tines	B-section V-belt, #50 O-ring-sealed roller chain
Aerating Width	28 in. (711 mm)
Coring Depth	Up to 2.5 in. (64 mm)
Core Diameter	0.75 in. (19 mm)
Aeration Pattern	3.5 in. x 5 in. (89 mm x 127 mm)
Holes per Square Feet	Up to 12
Productivity	Aerates up to 24,000 sq. ft./hr.
Transport	4 mph (6.4 km/h)
Tines	Hollow, tapered, austemper-hardened steel; 3/4 in. (19 mm) diameter tines
Tine Arms	4 arms; 2 tines per arm

Tires

Front	(1) 10.4 x 4.10/3.50, 4-ply, caster style
Rear	(2) 8.7 x 2.80/2.50, 4-ply

Features
Caster front for easy maneuverability Rubber isolated handlebars and spring-assist lift for ease of use Sealed, precision ball bearings at all locations in the tine arms and linkage for low maintenance and durability Extra set of tines standard

Dimensions

Width	34 in. (864 mm)
Length	56.4 in. (1.4 m)
Height	48 in. (1.2 m)
Weight	400 lbs. (181 kg)