The Gravely 817 is a lawn tractor model rated at 17 hp, positioning it within its class for power output. It was manufactured in 1977, featuring a 2-cylinder petrol air-cooled engine. This engine drives through a two-wheel drive system with an 8-speed gearbox. The listed weight of the Gravely 817 is 435 kg, suitable for jobs 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
17 hp
Weight
435 kg
Catalogue coverage
Variants represented
2
Richest spec table
40 rows
Recorded power
17 hp
Recorded weight
435 kg
Transmissions
8-speed gear
Production years
1977-1977
Verified variants
0
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Overview
ManufacturerGravelyReference
Garden tractorReference
Two-wheel driveReference
Manual steeringReference
Open operator station.Reference
Engine
16.5HP Onan 816cc 2-cyl gasolineReference
Fuel tank20.1 LReference
Onan CCKAReference
gasolineReference
2-cylinderReference
air-cooled horizontal-shaft opposed-twinReference
Displacement49.8 ciReference
Bore/Stroke76 x 83 mmReference
Power (gross)12.3 kWReference
Rated RPM3600Reference
StarterelectricReference
Starter volts12Reference
Oil capacity1.9 LReference
Transmission
8-speed gearReference
Typeshaft-driven gearReference
Gears8 forward and 4 reverseReference
Oil capacity5.7 LReference
Dimensions
Weight435 kgReference
Weight114 kgReference
Length207 cmReference
Width106 cmReference
Height109 cmReference
Shipping weight435 kgReference
Gravely 817 attachments
50" mid-mount mower deckReference
snowblowerReference
bladeReference
Electrical
GroundnegativeReference
Battery volts12Reference
Attachment overview
50" mid-mount mower deckReference
SnowblowerReference
BladeReference
50" Mower deck
Typemid-mount GravelyReference
Type3-blade with hydraulic liftReference
Cutting width127 cmReference
Cut height3 to 10 cmReference
Values normalized to UK metric units. Every figure is traced to at least one source; verified specs are cross-checked against two or more.
