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Gravely 812 vs Gravely 8122-G
Verdict: Gravely 812 vs Gravely 8122-G
The Gravely 812 and the Gravely 8122-G are both lawn tractors — here is how they stack up on the figures that matter. Both are rated at the same 12 hp. Gravely 812 is the lighter machine (408 kg vs 831 kg), which helps on soft ground and transport, while the heavier model carries more ballast for traction-limited draft work. Gravely 8122-G is the newer design (1986 vs 1973). 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
12 hp
12 hp
Confidence
40%
40%
Guide price
—
—
Overview
Manufacturer
GravelyReference
Gravely (a part of Ariens)Reference
air-cooled horizontal-shaftReference
Four gears (1-4) in two ranges (low-high) with forward/reverse clutches. The directional clutch must be in neutral to shift gears or ranges.Reference
Engine
Fuel tank
20.1 LReference
20.1 LReference
Displacement
29.07 ciReference
—
Bore/Stroke
83 x 86 mmReference
—
Power
8.9 kWReference
—
Rated RPM
3600Reference
—
Starter
electricReference
electricReference
Starter volts
12Reference
12Reference
Sparkplug gap
0.635 mmReference
—
Intake valve clearance
0.229 mmReference
—
Exhaust valve clearance
0.457 mmReference
—
Oil capacity
5.7 LReference
5.7 LReference
Power (gross)
—
8.9 kWReference
Transmission
Type
shaft-driven gearReference
shaft-driven gearReference
Gears
8 forward and 4 reverseReference
8 forward and 4 reverseReference
Oil type
SAE30Reference
10W-40 SCReference
Dimensions
Weight
408 kgReference
376 kgReference
Front tire
16x6.50-8Reference
16x6.50-8Reference
Rear tire
23x8.50-12Reference
23x8.50-12Reference
Lawn/turf front
16x6.50-8Reference
16x6.50-8Reference
Lawn/turf rear
23x8.50-12Reference
23x8.50-12Reference
Length
191 cmReference
208 cmReference
Width
92 cmReference
105 cmReference
Height
109 cmReference
116 cmReference
Shipping weight
408 kgReference
392 kgReference
Wheelbase
—
132 cmReference
Gravely 812 attachments
812 Serial Numbers
Location:
In front of, and below, air cleaner.Reference
Under hood on right side, on instrument panel support frame.Reference
Electrical
Ground
negativeReference
negativeReference
Battery volts
12Reference
12Reference
Battery AH
43Reference
42Reference
Battery Group
22FReference
BCI 22FReference
Attachment overview
PTO & Hydraulics
Mid PTO
—
independentReference
Gravely 8122-G attachments
8122-G Serial Numbers
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.