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Gravely Pro Master 20-H

Gravely Pro Master 20-H tractor
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The Gravely Pro Master 20-H is a front-mount mower lawn tractor produced from 1989 to 1991 by Gravely, a part of Ariens. It features a 20 horsepower engine option from either Kohler or Onan, hydrostatic Eaton 850 transmission with infinite forward and reverse speeds, and an open operator station. It has a 5.3 gallon fuel tank and weighs 980 lbs with the 60-inch mower attached. The tractor uses 18x8.50-8 front tires and 4.80/4.00-8 rear tires. It offers front PTO with an independent electric clutch. Attachments include 50-inch and 60-inch front-mount mower decks with hydraulic lift and right discharge.
Gravely Pro Master 20-Hlawn tractorKohler engineOnan enginehydrostatic transmissionfront-mount mowermower decktractor specs
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ModelPro Master 20-H

Technical Specifications

Detailed specifications and technical data for Gravely Pro Master 20-H

Engine

Onan:gasoline, 2-cylinder, air-cooled
Starter:electric
Fuel tank:5.3 gal (20.1 L)
Kohler M20:gasoline, 2-cylinder, air-cooled horizontal-shaft horizontally-opposed
Power Onan:20 hp (14.9 kW)
Bore/Stroke:3.12x3.06 inches (79 x 78 mm)
Displacement:770 cc (46.98 ci)
Oil capacity:2 qts (1.9 L)
Power (gross):20 hp (14.9 kW)
Starter volts:12
Engine options:20HP Kohler 770cc 2-cyl gasoline; 20HP Onan 781cc 2-cyl gasoline
Bore/Stroke Onan:3.258x2.875 inches (83 x 73 mm)
Displacement Onan:781 cc (47.7 ci)

Dimensions

Height:48 inches (121 cm)
Length:105 inches (266 cm)
Weight:980 lbs (444 kg) *Weight with 60-inch mower
Rear tire:4.80/4.00-8
Front tire:18x8.50-8

Electrical

Ground:negative
Battery volts:12
Charging amps:15 (Kohler), 20 (Onan)

Production

Type:Front-mount mower
Years made:1989 - 1991

Attachments

50" front-mount mower deck

Lift:hydraulic lift
Mount:front-mount
Width:50 inches (127 cm)
Blades:3-blade
Weight:215 lbs (97 kg)
Discharge:right-discharge
Cut height:1 to 4 inch (2 to 10 cm)
Manufacturer:Gravely

60" front-mount mower deck

Lift:hydraulic lift
Mount:front-mount
Width:60 inches (152 cm)
Blades:3-blade
Weight:297 lbs (134 kg)
Discharge:right-discharge
Cut height:1 to 4 inch (2 to 10 cm)
Manufacturer:Gravely

Transmission

Type:hydrostatic
Gears:infinite forward and reverse
Oil capacity:6 qts (5.7 L)
Transmission:Eaton 850

Power Take-off (PTO)

Clutch:electric
Front PTO:independent

Related Models

Gravely Pro Master 18-H

Model:Pro Master 18-H

Gravely Pro Master 30-H

Model:Pro Master 30-H