Gravely 8171
The Gravely 8171 is a tractor produced by Gravely Lawn Tractors. It is equipped with a 816 cc 49.8 ci engine. The listed engine power is Gasoline (gross): 16.5 hp / 12.3 kW. Transmission: 8 forward and 4 reverse. Operating weight: 935 lbs 424 kg.
Engine Power
Gasoline (gross): 16.5 hp / 12.3 kW
Fuel & Capacities
5.3 gal
20.1 L
Transmission
8 forward and 4 reverse
Operating Weight
935 lbs
424 kg
Overview
 | 1978
8000 SeriesGarden tractor
8000 Series
Garden tractor |
|---|
Production | |
|---|---|
Manufacturer | Gravely |
Garden tractor | |
Gravely 8171 Engine | |
|---|---|
16.5HP Onan 816cc 2-cyl gasoline | |
Engine details ...  |
Gravely 8171 Transmission | |
|---|---|
8-speed gear | |
Transmission details ...  |
Mechanical | |
|---|---|
Two-wheel drive | |
Manual steering | |
Mechanical band brakes | |
Open operator station. |
Capacity | |
|---|---|
Fuel | 5.3 gal
20.1 L |
Hydraulic system | 0.375 gal
1.4 L |
Hydraulics | |
|---|---|
Type | open center |
Capacity | 0.375 gal
1.4 L |
Pressure | 1200 psi
82.7 bar |
Pump flow | 1.7 gpm
6.4 lpm |
Power Take-off (PTO) | |
|---|---|
Mid PTO | independent |
Clutch | mechanical |
Dimensions & Tires | |
|---|---|
Wheelbase | 48 inches
121 cm |
Weight | 935 lbs
424 kg |
Front tire | 16x7.50-8 |
Rear tire | 23x10.50-12 |
Full dimensions and tires ...  | |
Electrical | |
|---|---|
Ground | negative |
Charging system | flywheel alternator |
Charging amps | 15 |
Battery volts | 12 |
Battery AH | 42 |
References | |
|---|---|
 | |
Commercial Ground Maintenance Tractors published in 1978, by Gravely |
Engine
Engine Detail — 816 cc / 49.8 ci Gasoline
Manufacturer | Onan CCKA |
Fuel Type | Gasoline |
Configuration | 2-cylinder, air-cooled horizontal-shaft opposed-twin |
Displacement | 816 cc
49.8 ci |
Bore/Stroke | 3.00x3.25 inches
76 x 83 mm |
Power (gross) | 16.5 hp
12.3 kW |
Starter | electric |
Starter volts | 12 |
Oil capacity | 2 qts
1.9 L |
Transmission
Transmission — 8 forward and 4 reverse shaft-driven gear
Type | shaft-driven gear |
Gears | 8 forward and 4 reverse |
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. | |
 | |
Dimensions
Gravely 8171 Tires | |
|---|---|
Lawn/turf front | 16x7.50-8 |
Lawn/turf rear | 23x10.50-12 |
Dimensions | |
|---|---|
Wheelbase | 48 inches
121 cm |
Length | 75.5 inches
191 cm |
Width | 41.75 inches
106 cm |
Height | 43 inches
109 cm |
Shipping weight | 935 lbs
424 kg |
Ground clearance | 7 inches
17 cm |
Photos
Gravely 8171 Commercial, left side.
Gravely 8171 Commercial, front view.
Front-mount mower on the Gravely 8171.
Recommended Implements & Sizing Guide
Engineering recommendations for Gravely Lawn Tractors Gravely 8171 based on its 16.5 HP power envelope and ASAE agricultural standards.
| Implement & Operation | Recommended Size | Workload Rating | Engineering Notes |
|---|---|---|---|
Moldboard PlowPrimary Tillage | 1 to 2 Bottom (12")1 - 2 铧 (30 cm) | Light Duty | Ideal for garden plots and light sandy soil. |
Rotary Cutter / MowerMowing & Clearing | 4 ft (48 in)1.2 m | Light Duty | Pasture clipping and light brush under 1" diameter. |
Rotary TillerSeedbed Prep | 42 to 48 in105 - 120 cm | Light Duty | Covers compact tractor tire width. |
Sizing & Soil Condition NoteActual implement sizing varies depending on local soil conditions (heavy clay vs sandy loam), field slope, and operating speed. Heavy tillage implements may require front ballast weights and wheel weights.
Fluids, Capacities & Working Autonomy
Standard fluid requirements, service intervals, and continuous runtime estimates for Gravely Lawn Tractors Gravely 8171.
Estimated Continuous Field Runtime: 6.2 hrs
Approximately 6.2 hours of continuous field operation at ~75% rated power on a full tank (5.3 gal / 20.1 L).
Estimated 75% Load Fuel Burn~0.9 gal/hr (3.2 L/hr)
Engine Crankcase Oil
SAE 15W-40 (Heavy Duty Diesel)
Standard Spec: API CK-4 / CJ-4 Heavy Duty
Service Interval: 150 – 250 Hours
Transmission & Hydraulic System
UTTO (Universal Tractor Transmission Oil)
Standard Spec: ISO VG 46 / 68 (Wet Brake & Trans Compatible)
Service Interval: 600 – 1000 Hours
Engine Cooling System
50/50 Ethylene Glycol Pre-mix
Standard Spec: ASTM D6210 / Heavy-Duty OAT Antifreeze
Service Interval: 2 Years / 1500 Hours
Gravely Lawn Tractors Gravely 8171 Specification Unit Converter
Convert power, fluid capacities, and operating weights between metric and imperial standards for Gravely Lawn Tractors Gravely 8171.
Converted Equivalents:
Horsepower (HP)16.5 hp
Kilowatts (kW)12.3 kW
Metric Horsepower (PS / CV)16.7 PS
Direct Competitor Comparison
Compare Gravely 8171 against same-era industry alternatives in the same horsepower class.
Current Model
Gravely Lawn Tractors
Gravely 8171
Engine Power:Gasoline (gross): 16.5 hp / 12.3 kW
★ Baseline Reference
International HarvesterMarket Competitor
International Harvester D-215
Engine Power:15
Production Years:1962 - 1964
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