Compare/Gravely 18-H vs Gravely 8171

Gravely 18-H vs Gravely 8171

Verdict: Gravely 18-H vs Gravely 8171

The Gravely 18-H and the Gravely 8171 are both lawn tractors — here is how they stack up on the figures that matter. Gravely 18-H leads on rated power with 18 hp against 17 hp. Gravely 18-H is the lighter machine (394 kg vs 424 kg), which helps on soft ground and transport, while the heavier model carries more ballast for traction-limited draft work. Gravely 18-H is the newer design (1987 vs 1978). In short: choose the Gravely 18-H for outright pulling power, or the Gravely 8171 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

17 hp

Confidence

40%

Guide price

—

Overview

Manufacturer

Gravely (a part of Ariens)Reference

GravelyReference

air-cooled horizontal-shaft horizontally-opposedReference

Four gears (1-4) in two ranges (low/high) with directional control lever (forward/reverse). Reverse speeds are the same in high or low range.Reference

Engine

Fuel tank

17.0 LReference

—

Displacement

42.18 ciReference

49.8 ciReference

Bore/Stroke

79 x 70 mmReference

76 x 83 mmReference

Power (gross)

13.4 kWReference

12.3 kWReference

Starter

electricReference

Starter volts

12Reference

Oil capacity

3.8 LReference

1.9 LReference

Transmission

SundstrandReference

—

Gears

infinite forward and reverseReference

8 forward and 4 reverseReference

PTO & Hydraulics

Rear Type

0Reference

—

Mid PTO

independentReference

Clutch

electricReference

mechanicalReference

Hydraulic system

—

1.4 LReference

Capacity

—

1.4 LReference

Pressure

—

82.7 barReference

Pump flow

—

6.4 lpmReference

Dimensions

Wheelbase

123 cmReference

121 cmReference

Weight

76 kgReference

424 kgReference

Front tire

16x6.50-8Reference

16x7.50-8Reference

Rear tire

23x10.50-12Reference

Lawn/turf front

16x6.50-8Reference

16x7.50-8Reference

Lawn/turf rear

23x10.50-12Reference

Length

187 cmReference

191 cmReference

Width

108 cmReference

106 cmReference

Height

116 cmReference

109 cmReference

Shipping weight

394 kgReference

424 kgReference

Ground clearance

—

17 cmReference

Gravely 18-H attachments

Electrical

Ground

negativeReference

Charging amps

15Reference

Battery volts

12Reference

Charging system

—

flywheel alternatorReference

Battery AH

—

42Reference

Attachment overview

48" Mower deck

Type

shaft-driven hydrostaticReference

shaft-driven gearReference

Cutting width

121 cmReference

—

Overall width

134 cmReference

—

Cut height

3 to 8 cmReference

—

Capacities

Fuel

—

20.1 LReference

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.