The Gravely 8171 is a lawn tractor with a rated output of 17 hp, placing it mid-range in terms of power within its class. Produced in 1978, it features a 2-cylinder petrol air-cooled engine driving through a two-wheel drive system with an 8-speed gearbox. The listed weight of the Gravely 8171 is 424 kg, and it is designed for use on areas of 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
424 kg
Catalogue coverage
Variants represented
2
Richest spec table
45 rows
Recorded power
17 hp
Recorded weight
424 kg
Transmissions
8-speed gear
Production years
1978-1978
Verified variants
0
No linked source document is currently displayed; verify critical figures with the manufacturer or dealer.
Hover a source tag to verify
Overview
ManufacturerGravelyReference
Garden tractorReference
Two-wheel driveReference
Manual steeringReference
Mechanical band brakesReference
Open operator station.Reference
Engine
16.5HP Onan 816cc 2-cyl gasolineReference
Onan CCKAReference
gasolineReference
2-cylinderReference
air-cooled horizontal-shaft opposed-twinReference
Displacement49.8 ciReference
Bore/Stroke76 x 83 mmReference
Power (gross)12.3 kWReference
StarterelectricReference
Starter volts12Reference
Oil capacity1.9 LReference
Transmission
8-speed gearReference
Typeshaft-driven gearReference
Gears8 forward and 4 reverseReference
Four gears (1-4) in two ranges (low/high) with directional control lever (forward/reverse). Reverse speeds are the same in high or low range.Reference
Capacities
Fuel20.1 LReference
PTO & Hydraulics
Hydraulic system1.4 LReference
Typeopen centerReference
Capacity1.4 LReference
Pressure82.7 barReference
Pump flow6.4 lpmReference
Mid PTOindependentReference
ClutchmechanicalReference
Dimensions
Wheelbase121 cmReference
Weight424 kgReference
Front tire16x7.50-8Reference
Rear tire23x10.50-12Reference
Lawn/turf front16x7.50-8Reference
Lawn/turf rear23x10.50-12Reference
Length191 cmReference
Width106 cmReference
Height109 cmReference
Shipping weight424 kgReference
Ground clearance17 cmReference
Electrical
GroundnegativeReference
Charging systemflywheel alternatorReference
Charging amps15Reference
Battery volts12Reference
Battery AH42Reference
Values normalized to UK metric units. Every figure is traced to at least one source; verified specs are cross-checked against two or more.
