The Gravely 450 is a lawn tractor rated at 17 hp, positioning it in the middle of its class in terms of power output. The model was manufactured in 1970. It features a 2-cylinder petrol air-cooled engine, coupled with a 4-speed gearbox and two-wheel drive. The listed weight of the Gravely 450 is 430 kg, suitable for tasks covering approximately 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
430 kg
Catalogue coverage
Variants represented
2
Richest spec table
46 rows
Recorded power
17 hp
Recorded weight
430 kg
Transmissions
4-speed gear
Production years
1970-1970
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-cooledReference
Displacement49.8 ciReference
Bore/Stroke76 x 83 mmReference
Power12.3 kWReference
Air cleanerdry elementReference
Rated RPM3600Reference
Starter volts12Reference
Sparkplug gap0.635 mmReference
Intake valve clearance0.279 mmReference
Exhaust valve clearance0.279 mmReference
Oil capacity1.9 LReference
Transmission
4-speed gearReference
TransmissionSwiftamatic 8Reference
Typeshaft-driven gearReference
Gears4 forward and reverseReference
Oil capacity4.7 LReference
Oil typeSAE 90W-EPReference
Two-speed shift-on-the-move affects transmission and PTO speed. Additional two-speed range for transmission can be shifted only when stopped. Right-hand directional clutch lever controls forward and reverse.Reference
Dimensions
Weight430 kgReference
Front tire16x6.50-8Reference
Rear tire23x8.50-12Reference
Lawn/turf front16x6.50-8Reference
Lawn/turf rear23x8.50-12Reference
Length191 cmReference
Width106 cmReference
Height109 cmReference
Shipping weight430 kgReference
Gravely 450 attachments
30" mid-mount mower deckReference
40" mid-mount mower deckReference
50" mid-mount mower deckReference
450 Serial Numbers
Location:Ahead of rear axle on left side.Reference
Electrical
GroundnegativeReference
Battery volts12Reference
Attachment overview
30" mid-mount mower deckReference
40" mid-mount mower deckReference
50" mid-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.
