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Lawn Tractor · 1989Unverified

Gravely Pro Master 20-H

Name: Gravely Pro Master 20-H
Brand: Gravely

Gravely Pro Master 20-H — Front-mount mower · 20 hp. Reference specifications; pending source verification.

The Gravely Pro Master 20-H is a lawn tractor with a rated engine power of approximately 20 hp, placing it at the higher end of its class. It was produced from 1989 to 1991. The Pro Master 20-H is equipped with a 2-cylinder petrol air-cooled engine and two-wheel drive, paired with a hydrostatic transmission. Its operating weight is listed at 444 kg, and it is suitable for use on areas of up to 200 acres.

Provisional listing — the headline figure is shown; full specifications are auto-generated and pending verification against published sources.

Rated power

20 hp

Weight

444 kg

Catalogue coverage

Variants represented

Richest spec table

45 rows

Recorded power

20 hp

Recorded weight

444 kg

Transmissions

hydrostatic

Production years

1989-1991

Verified variants

No linked source document is currently displayed; verify critical figures with the manufacturer or dealer.

Hover a source tag to verify

Overview

ManufacturerGravely (a part of Ariens)Reference

Front-mount mowerReference

Two-wheel driveReference

Disc brakesReference

Open operator station.Reference

Engine

20HP Kohler 770cc 2-cyl gasolineReference

20HP Onan 781cc 2-cyl gasolineReference

Fuel tank20.1 LReference

Kohler M20Reference

gasolineReference

2-cylinderReference

air-cooled horizontal-shaft horizontally-opposedReference

Displacement46.98 ciReference

Bore/Stroke79 x 78 mmReference

Power (gross)14.9 kWReference

StarterelectricReference

Starter volts12Reference

Oil capacity1.9 LReference

OnanReference

air-cooledReference

Displacement47.7 ciReference

Bore/Stroke83 x 73 mmReference

Power14.9 kWReference

Transmission

hydrostaticReference

TransmissionEaton 850Reference

TypehydrostaticReference

Gearsinfinite forward and reverseReference

Oil capacity5.7 LReference

PTO & Hydraulics

Front PTOindependentReference

ClutchelectricReference

Dimensions

Weight444 kgReference

Front tire18x8.50-8Reference

Rear tire4.80/4.00-8Reference

Lawn/turf front18x8.50-8Reference

Lawn/turf rear4.80/4.00-8Reference

Length266 cmReference

Height121 cmReference

Gravely Pro Master 20-H attachments

50" front-mount mower deckReference

60" front-mount mower deckReference

Electrical

GroundnegativeReference

Charging amps15 (Kohler)Reference

Charging amps20 (Onan)Reference

Battery volts12Reference

Attachment overview

50" front-mount mower deckReference

60" front-mount mower deckReference

Values normalized to UK metric units. Every figure is traced to at least one source; verified specs are cross-checked against two or more.

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