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Gravely 450 vs Gravely 817
Verdict: Gravely 450 vs Gravely 817
The Gravely 450 and the Gravely 817 are both lawn tractors — here is how they stack up on the figures that matter. Both are rated at the same 17 hp. Gravely 450 is the lighter machine (430 kg vs 435 kg), which helps on soft ground and transport, while the heavier model carries more ballast for traction-limited draft work. Gravely 817 is the newer design (1977 vs 1970). Use the full side-by-side spec tables below to weigh the details against your own operation, and confirm with a dealer demo.
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Fit & specs
Gravely
62
Fit score
Best match
Clear
Gravely
62
Fit score
Best match
Clear
Rated power
17 hp
17 hp
Confidence
40%
40%
Guide price
—
—
Overview
Manufacturer
GravelyReference
GravelyReference
Two-speed shift-on-the-move affects transmission and PTO speed. Additional two-speed range for transmission can be shifted only when stopped. Right-hand directional clutch lever controls forward and reverse.Reference
air-cooled horizontal-shaft opposed-twinReference
Engine
Fuel tank
20.1 LReference
20.1 LReference
Displacement
49.8 ciReference
49.8 ciReference
Bore/Stroke
76 x 83 mmReference
76 x 83 mmReference
Power
12.3 kWReference
—
Air cleaner
dry elementReference
—
Rated RPM
3600Reference
3600Reference
Starter volts
12Reference
12Reference
Sparkplug gap
0.635 mmReference
—
Intake valve clearance
0.279 mmReference
—
Exhaust valve clearance
0.279 mmReference
—
Oil capacity
4.7 LReference
5.7 LReference
Power (gross)
—
12.3 kWReference
Starter
—
electricReference
Transmission
Transmission
Swiftamatic 8Reference
—
Type
shaft-driven gearReference
shaft-driven gearReference
Gears
4 forward and reverseReference
8 forward and 4 reverseReference
Oil type
SAE 90W-EPReference
—
Dimensions
Weight
430 kgReference
114 kgReference
Front tire
16x6.50-8Reference
—
Rear tire
23x8.50-12Reference
—
Lawn/turf front
16x6.50-8Reference
—
Lawn/turf rear
23x8.50-12Reference
—
Length
191 cmReference
207 cmReference
Width
106 cmReference
106 cmReference
Height
109 cmReference
109 cmReference
Shipping weight
430 kgReference
435 kgReference
Gravely 450 attachments
450 Serial Numbers
Location:
Ahead of rear axle on left side.Reference
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Electrical
Ground
negativeReference
negativeReference
Battery volts
12Reference
12Reference
Attachment overview
Gravely 817 attachments
50" Mower deck
Cutting width
—
127 cmReference
Cut height
—
3 to 10 cmReference
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.