Gravely Pro Master 18-H

The Gravely Pro Master 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: Eaton 850. Operating weight: 980 lbs*Weight with 60-inch mower 444 kg.

Engine Power

Gasoline (gross): 18 hp / 13.4 kW

Fuel & Capacities

5.3 gal 20.1 L

Transmission

Eaton 850

Operating Weight

980 lbs*Weight with 60-inch mower 444 kg

Overview

	1989 - 1991 Front-mount mower

Production
Manufacturer	Gravely (a part of Ariens)
Front-mount mower

Gravely Pro Master 18-H Engine
18HP Kohler 691cc 2-cyl gasoline
Fuel tank	5.3 gal 20.1 L
Engine details ...

Gravely Pro Master 18-H Transmission
hydrostatic
Transmission details ...

Mechanical
Two-wheel drive
Disc brakes
Open operator station.

Power Take-off (PTO)
Front PTO	independent
Clutch	electric

Dimensions & Tires
Weight	980 lbs 444 kg
Front tire	18x8.50-8
Rear tire	4.80/4.00-8
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	2 qts 1.9 L

Transmission

Transmission — Eaton 850

Transmission	Eaton 850
Type	hydrostatic
Gears	infinite forward and reverse
Oil capacity	6 qts 5.7 L

Dimensions

Gravely Pro Master 18-H Tires
Lawn/turf front	18x8.50-8
Lawn/turf rear	4.80/4.00-8

Dimensions
Length	105 inches 266 cm
Height	48 inches 121 cm
Weight	980 lbs*Weight with 60-inch mower 444 kg

Attachments

Attachment overview
50" front-mount mower deck
60" front-mount mower deck

Photos

Gravely Pro Master 18-H tractor photo

Recommended Implements & Sizing Guide

Engineering recommendations for Gravely Lawn Tractors Gravely Pro Master 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 Pro Master 18-H.

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 Pro Master 18-H Specification Unit Converter

Convert power, fluid capacities, and operating weights between metric and imperial standards for Gravely Lawn Tractors Gravely Pro Master 18-H.

Enter value:

Unit:

Converted Equivalents:

Horsepower (HP)18 hp

Kilowatts (kW)13.4 kW

Metric Horsepower (PS / CV)18.2 PS

Direct Competitor Comparison

Compare Gravely Pro Master 18-H against same-era industry alternatives in the same horsepower class.

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