Compare/Gravely 18-G vs Gravely Pro Master 20-H

Gravely 18-G vs Gravely Pro Master 20-H

Verdict: Gravely 18-G vs Gravely Pro Master 20-H

The Gravely 18-G and the Gravely Pro Master 20-H are both lawn tractors — here is how they stack up on the figures that matter. Gravely Pro Master 20-H leads on rated power with 20 hp against 18 hp. Gravely 18-G is the lighter machine (391 kg vs 444 kg), which helps on soft ground and transport, while the heavier model carries more ballast for traction-limited draft work. Gravely Pro Master 20-H is the newer design (1989 vs 1988). In short: choose the Gravely Pro Master 20-H for outright pulling power, or the Gravely 18-G if a tighter budget and lighter footprint matter more. Compare the full spec tables below before booking a demo.

Tune the fit score

Tell us about your operation

Acreage600 acBudgetMain crop / use

Fit & specs

Gravely

Fit score

Best match

Clear

Gravely

Fit score

Best match

Clear

Rated power

18 hp

20 hp

Confidence

40%

Guide price

—

Overview

Manufacturer

GravelyReference

Gravely (a part of Ariens)Reference

air-cooledReference

Engine

Fuel tank

20.1 LReference

Displacement

42.18 ciReference

47.7 ciReference

Bore/Stroke

79 x 70 mmReference

83 x 73 mmReference

Power (gross)

13.4 kWReference

14.9 kWReference

Rated RPM

3300Reference

—

Starter

electricReference

Starter volts

12Reference

Oil capacity

5.7 LReference

Power

—

14.9 kWReference

Transmission

Type

shaft-driven gearReference

hydrostaticReference

Gears

8 forward and 4 reverseReference

infinite forward and reverseReference

Oil type

SC10W-30Reference

—

Transmission

—

Eaton 850Reference

Dimensions

Wheelbase

132 cmReference

—

Weight

391 kgReference

444 kgReference

Front tire

16x7.50-8Reference

18x8.50-8Reference

Rear tire

23x10.50-12Reference

4.80/4.00-8Reference

Lawn/turf front

16x7.50-8Reference

18x8.50-8Reference

Lawn/turf rear

23x10.50-12Reference

4.80/4.00-8Reference

Length

208 cmReference

266 cmReference

Width

109 cmReference

—

Height

129 cmReference

121 cmReference

Gravely 18-G attachments

Electrical

Ground

negativeReference

Charging amps

15Reference

20 (Onan)Reference

Battery volts

12Reference

Battery AH

42Reference

—

Battery Group

22FReference

—

Attachment overview

PTO & Hydraulics

Front PTO

—

independentReference

Clutch

—

electricReference

Gravely Pro Master 20-H attachments

Fit score weighs budget, operation size, crop match and data confidence against the details above. It’s guidance, not advice — always confirm with a dealer demo.