Gravely 818
The Gravely 818 is a tractor produced by Gravely Lawn Tractors. It is equipped with a 781 cc 47.7 ci engine. The listed engine power is Gasoline (gross): 18 hp / 13.4 kW. Transmission: 8 forward and 4 reverse. Operating weight: 900 lbs 408 kg.
Engine Power
Gasoline (gross): 18 hp / 13.4 kW
Fuel & Capacities
5.3 gal
20.1 L
Transmission
8 forward and 4 reverse
Operating Weight
900 lbs
408 kg
Overview
 | 1978
800 SeriesGarden tractor
800 Series
Garden tractor |
|---|
Production | |
|---|---|
Manufacturer | Gravely |
Garden tractor | |
Gravely 818 Engine | |
|---|---|
18HP Onan 781cc 2-cyl gasoline | |
Fuel tank | 5.3 gal
20.1 L |
Engine details ...  | |
Gravely 818 Transmission | |
|---|---|
8-speed | |
Transmission details ...  |
Mechanical | |
|---|---|
Two-wheel drive | |
Manual steering | |
Open operator station. |
Dimensions & Tires | |
|---|---|
Weight | 900 lbs
408 kg |
Front tire | 16x6.50-8 |
Rear tire | 23x8.50-12 |
Full dimensions and tires ...  | |
Electrical | |
|---|---|
Ground | negative |
Battery volts | 12 |
Battery AH | 43 |
Battery Group | 22F |
References | |
|---|---|
 | |
Owner's Manual 800 Series (22454) published in 1977 | |
Riding Tractors published in 1978, by Gravely |
Engine
Engine Detail — 781 cc / 47.7 ci Gasoline
Manufacturer | Onan B48M |
Fuel Type | Gasoline |
Configuration | 2-cylinder, air-cooled horizontal-shaft opposed-twin |
Displacement | 781 cc
47.7 ci |
Bore/Stroke | 3.25x2.875 inches
83 x 73 mm |
Power (gross) | 18 hp
13.4 kW |
Starter | electric |
Starter volts | 12 |
Oil capacity | 2.25 qts
2.1 L |
Transmission
Transmission — 8 forward and 4 reverse
Gears | 8 forward and 4 reverse |
Oil capacity | 6 qts
5.7 L |
 | |
Dimensions
Gravely 818 Tires | |
|---|---|
Lawn/turf front | 16x6.50-8 |
Lawn/turf rear | 23x8.50-12 |
Dimensions | |
|---|---|
Length | 81.5 inches
207 cm |
Width | 41.75 inches
106 cm |
Height | 43 inches
109 cm |
Shipping weight | 900 lbs
408 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 21297 |
3-blade with hydraulic lift | |
Cutting width | 50 inches
127 cm |
Photos
Gravely 818
Gravely 818
Recommended Implements & Sizing Guide
Engineering recommendations for Gravely Lawn Tractors Gravely 818 based on its 18 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 818.
Estimated Continuous Field Runtime: 5.7 hrs
Approximately 5.7 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 (3.5 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 818 Specification Unit Converter
Convert power, fluid capacities, and operating weights between metric and imperial standards for Gravely Lawn Tractors Gravely 818.
Converted Equivalents:
Horsepower (HP)18 hp
Kilowatts (kW)13.4 kW
Metric Horsepower (PS / CV)18.2 PS
Direct Competitor Comparison
Compare Gravely 818 against same-era industry alternatives in the same horsepower class.
Current Model
Gravely Lawn Tractors
Gravely 818
Engine Power:Gasoline (gross): 18 hp / 13.4 kW
★ Baseline Reference
International HarvesterMarket Competitor
International Harvester Type A 15HP
Engine Power:16.7
Production Years:1908 - 1911
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