Roper GTK18
The Roper GTK18 is a tractor produced by Roper 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: 6 forward and 2 reverse.
Engine Power
Gasoline (gross): 18 hp / 13.4 kW
Fuel & Capacities
Gasoline
Transmission
6 forward and 2 reverse
Overview
 | 1988
Garden tractor |
|---|
Production | |
|---|---|
Manufacturer | Roper |
Garden tractor | |
Original price was $2,700 in 1988 | |
Variants | |
|---|---|
GT18 | Briggs |
GTK18 | Kohler |
Roper GTK18 Engine | |
|---|---|
18HP Kohler 691cc 2-cyl gasoline | |
Engine details ...  |
Roper GTK18 Transmission | |
|---|---|
6-speed gear | |
Transmission details ...  |
Mechanical | |
|---|---|
Two-wheel drive | |
Manual steering | |
Open operator station. |
Dimensions & Tires | |
|---|---|
Front tire | 16x6.5-8 |
Rear tire | 23x10.5-12 |
Full dimensions and tires ...  | |
Electrical | |
|---|---|
Ground | negative |
Battery volts | 12 |
References | |
|---|---|
 | |
Owner's Manual Model Numbers GTK181AR and GTK181AT |
Engine
Engine Detail — 691 cc / 42.18 ci Gasoline
Manufacturer | Kohler M18 |
Fuel Type | Gasoline |
Configuration | 2-cylinder, air-cooled horizontal-shaft opposed-twin |
Displacement | 691 cc
42.18 ci |
Bore/Stroke | 3.125x2.75 inches
79 x 70 mm |
Power (gross) | 18 hp
13.4 kW |
Starter | electric |
Starter volts | 12 |
Transmission
Transmission — 6 forward and 2 reverse belt-driven gear
Type | belt-driven gear |
Gears | 6 forward and 2 reverse |
Dimensions
Roper GTK18 Tires | |
|---|---|
Lawn/turf front | 16x6.5-8 |
Lawn/turf rear | 23x10.5-12 |
Dimensions |
|---|
Attachments
50" Mower deck | |
|---|---|
Type | mid-mount Roper |
3-blade | |
Cutting width | 50 inches
127 cm |
Photos
Roper GTK18 tractor photo
Recommended Implements & Sizing Guide
Engineering recommendations for Roper Lawn Tractors Roper GTK18 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 Roper Lawn Tractors Roper GTK18.
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
Roper Lawn Tractors Roper GTK18 Specification Unit Converter
Convert power, fluid capacities, and operating weights between metric and imperial standards for Roper Lawn Tractors Roper GTK18.
Converted Equivalents:
Horsepower (HP)18 hp
Kilowatts (kW)13.4 kW
Metric Horsepower (PS / CV)18.2 PS
Direct Competitor Comparison
Compare Roper GTK18 against same-era industry alternatives in the same horsepower class.
Current Model
Roper Lawn Tractors
Roper GTK18
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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