Gravely 18-H
The Gravely 18-H is a tractor produced by Gravely Lawn Tractors. It is equipped with a 691 cc 42.18 ci engine. The listed engine power is Gasoline (gross): 18 hp / 13.4 kW. Transmission: Sundstrand. Operating weight: 169 lbs 76 kg.
Engine Power
Gasoline (gross): 18 hp / 13.4 kW
Fuel & Capacities
4.5 gal
17.0 L
Transmission
Sundstrand
Operating Weight
169 lbs
76 kg
Overview
 | 1987 - 1991
Garden tractor |
|---|
Production | |
|---|---|
Manufacturer | Gravely (a part of Ariens) |
Garden tractor | |
Gravely 18-H Engine | |
|---|---|
18HP Kohler 691cc 2-cyl gasoline | |
Fuel tank | 4.5 gal
17.0 L |
Engine details ...  | |
Gravely 18-H Transmission | |
|---|---|
hydrostatic | |
Transmission details ...  |
Mechanical | |
|---|---|
Two-wheel drive | |
Manual steering | |
Disc brakes | |
Open operator station. |
Tractor hitch | |
|---|---|
Rear Type | 0 OptOptional |
Power Take-off (PTO) | |
|---|---|
Mid PTO | independent |
Clutch | electric |
Dimensions & Tires | |
|---|---|
Wheelbase | 48.5 inches
123 cm |
Weight | 870 lbs
394 kg |
Front tire | 16x6.50-8 |
Rear tire | 23x10.50-12 |
Full dimensions and tires ...  | |
Electrical | |
|---|---|
Ground | negative |
Charging amps | 15 |
Battery volts | 12 |
References | |
|---|---|
 | |
Riding Tractors published in 1990, by Gravely |
Engine
Engine Detail — 691 cc / 42.18 ci Gasoline
Manufacturer | Kohler M18 |
Fuel Type | Gasoline |
Configuration | 2-cylinder, air-cooled horizontal-shaft horizontally-opposed |
Displacement | 691 cc
42.18 ci |
Bore/Stroke | 3.12x2.75 inches
79 x 70 mm |
Power (gross) | 18 hp
13.4 kW |
Starter | electric |
Starter volts | 12 |
Oil capacity | 1.5 qts
1.4 L |
Transmission
Transmission — Sundstrand
Transmission | Sundstrand |
Type | shaft-driven hydrostatic |
Gears | infinite forward and reverse |
Oil capacity | 4 qts
3.8 L |
 | |
Dimensions
Gravely 18-H Tires | |
|---|---|
Lawn/turf front | 16x6.50-8 |
Lawn/turf rear | 23x10.50-12 |
Dimensions | |
|---|---|
Wheelbase | 48.5 inches
123 cm |
Length | 74 inches
187 cm |
Width | 42.8 inches
108 cm |
Height | 45.8 inches
116 cm |
Shipping weight | 870 lbs
394 kg |
Attachments
Attachment overview | |
|---|---|
48" 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. |
48" Mower deck | |
|---|---|
Type | mid-mount Gravely |
3-blade with hydraulic lift | |
Cutting width | 48 inches
121 cm |
Weight | 169 lbs
76 kg |
Overall width | 53 inches
134 cm |
Cut height | 1.5 to 3.5 inch
3 to 8 cm |
Photos
Gravely 18-H tractor photo
Recommended Implements & Sizing Guide
Engineering recommendations for Gravely Lawn Tractors Gravely 18-H 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 18-H.
Estimated Continuous Field Runtime: 4.8 hrs
Approximately 4.8 hours of continuous field operation at ~75% rated power on a full tank (4.5 gal / 17 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 18-H Specification Unit Converter
Convert power, fluid capacities, and operating weights between metric and imperial standards for Gravely Lawn Tractors Gravely 18-H.
Converted Equivalents:
Horsepower (HP)18 hp
Kilowatts (kW)13.4 kW
Metric Horsepower (PS / CV)18.2 PS
Direct Competitor Comparison
Compare Gravely 18-H against same-era industry alternatives in the same horsepower class.
Current Model
Gravely Lawn Tractors
Gravely 18-H
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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