Gravely Pro Master 20-H

The Gravely Pro Master 20-H is a tractor produced by Gravely Lawn Tractors. It is equipped with a 781 cc 47.7 ci engine. The listed engine power is Gasoline (gross): 20 hp / 14.9 kW; Gasoline (listed): 20 hp / 14.9 kW. Transmission: Eaton 850. Operating weight: 980 lbs*Weight with 60-inch mower 444 kg.

Overview

	1989 - 1991 Front-mount mower

Production
Manufacturer	Gravely (a part of Ariens)
Front-mount mower

Gravely Pro Master 20-H Transmission
hydrostatic
Transmission details ...

Mechanical
Two-wheel drive
Disc brakes
Open operator station.

Power Take-off (PTO)
Front PTO	independent
Clutch	electric

Dimensions & Tires
Weight	980 lbs 444 kg
Front tire	18x8.50-8
Rear tire	4.80/4.00-8
Full dimensions and tires ...

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

References
Riding Tractors published in 1990, by Gravely

Engine

Engine options
20HP Kohler 770cc 2-cyl gasoline
20HP Onan 781cc 2-cyl gasoline

Engine Detail — 770 cc / 46.98 ci Gasoline

Manufacturer	Kohler M20
Fuel Type	Gasoline
Configuration	2-cylinder, air-cooled horizontal-shaft horizontally-opposed
Displacement	770 cc 46.98 ci
Bore/Stroke	3.12x3.06 inches 79 x 78 mm
Power (gross)	20 hp 14.9 kW
Starter	electric
Starter volts	12
Oil capacity	2 qts 1.9 L

Engine Detail — 781 cc / 47.7 ci Gasoline

Manufacturer	Onan
Fuel Type	Gasoline
Configuration	2-cylinder, air-cooled
Displacement	781 cc 47.7 ci
Bore/Stroke	3.258x2.875 inches 83 x 73 mm
Power	20 hp 14.9 kW

Transmission

Transmission — Eaton 850

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

Dimensions

Gravely Pro Master 20-H Tires
Lawn/turf front	18x8.50-8
Lawn/turf rear	4.80/4.00-8

Dimensions
Length	105 inches 266 cm
Height	48 inches 121 cm
Weight	980 lbs*Weight with 60-inch mower 444 kg

Attachments

Attachment overview
50" front-mount mower deck
60" front-mount mower deck

Photos

Gravely Pro Master 20-H tractor photo