Gravely 817
The Gravely 817 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: 252 lbs 114 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
252 lbs
114 kg
Overview
 | 1977
800 SeriesGarden tractor
800 Series
Garden tractor |
|---|
Production | |
|---|---|
Manufacturer | Gravely |
Garden tractor | |
Gravely 817 Engine | |
|---|---|
16.5HP Onan 816cc 2-cyl gasoline | |
Fuel tank | 5.3 gal
20.1 L |
Engine details ...  | |
Gravely 817 Transmission | |
|---|---|
8-speed gear | |
Transmission details ...  |
Mechanical | |
|---|---|
Two-wheel drive | |
Manual steering | |
Open operator station. |
Dimensions & Tires | |
|---|---|
Weight | 960 lbs
435 kg |
Full dimensions and tires ...  | |
Electrical | |
|---|---|
Ground | negative |
Battery volts | 12 |
References | |
|---|---|
 | |
Choice of the Pros published in 1977, 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 |
Rated RPM | 3600 |
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 |
Oil capacity | 6 qts
5.7 L |
 | |
Dimensions
Gravely 817 Tires |
|---|
Dimensions | |
|---|---|
Length | 81.5 inches
207 cm |
Width | 41.75 inches
106 cm |
Height | 43 inches
109 cm |
Shipping weight | 960 lbs
435 kg |
Attachments
Attachment overview | |
|---|---|
50" mid-mount mower deck | |
Snowblower | |
Blade | |
Garden tractors are capable of using tillers, plows, or other ground-engaging attachments. TractorData does not list details of these attachments. |
50" Mower deck | |
|---|---|
Type | mid-mount Gravely |
3-blade with hydraulic lift | |
Cutting width | 50 inches
127 cm |
Weight | 252 lbs
114 kg |
Cut height | 1.5 to 4 inch
3 to 10 cm |
Photos
Gravely 817
Gravely 817
Gravely 817
Gravely 817
Recommended Implements & Sizing Guide
Engineering recommendations for Gravely Lawn Tractors Gravely 817 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 817.
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 817 Specification Unit Converter
Convert power, fluid capacities, and operating weights between metric and imperial standards for Gravely Lawn Tractors Gravely 817.
Converted Equivalents:
Horsepower (HP)16.5 hp
Kilowatts (kW)12.3 kW
Metric Horsepower (PS / CV)16.7 PS
Direct Competitor Comparison
Compare Gravely 817 against same-era industry alternatives in the same horsepower class.
Current Model
Gravely Lawn Tractors
Gravely 817
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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