The Gravely 8129 is a lawn tractor with a rated power of 12 hp, a mid-range figure for its class. Built in 1980, this model features a 1-cylinder petrol air-cooled engine and a two-wheel drive system with an 8-speed gearbox. The Gravely 8129 has an operating weight of 403 kg and is suited to operations covering up to 200 acres.
Provisional listing — the headline figure is shown; full specifications are auto-generated and pending verification against published sources.
Rated power
12 hp
Weight
403 kg
Catalogue coverage
Variants represented
2
Richest spec table
44 rows
Recorded power
12 hp
Recorded weight
403 kg
Transmissions
8-speed gear
Production years
1980-1980
Verified variants
0
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Overview
ManufacturerGravelyReference
Garden tractorReference
Two-wheel driveReference
Manual steeringReference
Mechanical band brakesReference
Open operator station.Reference
Variants
8128mechanical liftReference
8129hydraulic liftReference
Engine
12HP Kohler 476cc 1-cyl gasolineReference
Fuel tank20.1 LReference
Kohler K301Reference
gasolineReference
1-cylinderReference
air-cooled horizontal-shaftReference
Displacement29.07 ciReference
Bore/Stroke86 x 83 mmReference
Power8.9 kWReference
StarterelectricReference
Starter volts12Reference
Image courtesy of Todd JonesReference
Transmission
8-speed gearReference
Typeshaft-driven gearReference
Gears8 forward and 4 reverseReference
Four gears (1-4) in two ranges (low-high) with forward/reverse clutches. The directional clutch must be in neutral to shift gears or ranges.Reference
PTO & Hydraulics
Typeopen centerReference
Pressure82.7 barReference
Pump flow6.4 lpmReference
Mid PTOindependentReference
ClutchmechanicalReference
Mid PTO Type1000Reference
Dimensions
Wheelbase132 cmReference
Weight403 kgReference
Front tire16x6.50-8Reference
Rear tire23x8.50-12Reference
Lawn/turf front16x6.50-8Reference
Lawn/turf rear23x8.50-12Reference
Length201 cmReference
Width92 cmReference
Height109 cmReference
Shipping weight403 kgReference
Ground clearance17 cmReference
Electrical
GroundnegativeReference
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.
