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Gravely 8121

The Gravely 8121 is a tractor produced by Gravely Lawn Tractors. It is equipped with a 476 cc 29.07 ci engine. The listed engine power is Gasoline (gross): 12 hp / 8.9 kW. Transmission: 8 forward and 4 reverse. Operating weight: 890 lbs 403 kg.

Engine Power
Gasoline (gross): 12 hp / 8.9 kW
Fuel & Capacities
5.3 gal 20.1 L
Transmission
8 forward and 4 reverse
Operating Weight
890 lbs 403 kg

Overview

Gravely 8121 tractor photo
1978 8000 SeriesGarden tractor 8000 Series Garden tractor
Production
Manufacturer
Gravely
Garden tractor
Variants
8120
mechanical lift
8121
hydraulic lift
Gravely 8121 Engine
12HP Kohler 476cc 1-cyl gasoline
Engine details ...
Gravely 8121 Transmission
8-speed gear
Transmission details ...
Mechanical
Two-wheel drive
Manual steering
Mechanical band brakes
Open operator station.
Capacity
Fuel
5.3 gal 20.1 L
Hydraulic system
0.375 gal 1.4 L
Hydraulics
Type
open center
Capacity
0.375 gal 1.4 L
Pressure
1200 psi 82.7 bar
Pump flow
1.7 gpm 6.4 lpm
Power Take-off (PTO)
Mid PTO
independent
Clutch
mechanical
Dimensions & Tires
Wheelbase
48 inches 121 cm
Weight
890 lbs 403 kg
Front tire
16x7.50-8
Rear tire
23x10.50-12
Full dimensions and tires ...
Electrical
Ground
negative
Charging system
flywheel alternator
Charging amps
15
Battery volts
12
Battery AH
42
References
8121 references literature
Commercial Ground Maintenance Tractors published in 1978, by Gravely

Engine

Engine Detail — 476 cc / 29.07 ci Gasoline

Manufacturer
Kohler K301
Fuel Type
Gasoline
Configuration
1-cylinder, air-cooled horizontal-shaft
Displacement
476 cc 29.07 ci
Bore/Stroke
3.258x3.37 inches 83 x 86 mm
Power (gross)
12 hp 8.9 kW
Starter
electric
Starter volts
12
Oil capacity
2 qts 1.9 L

Transmission

Transmission — 8 forward and 4 reverse shaft-driven gear

Type
shaft-driven gear
Gears
8 forward and 4 reverse
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.
8121 shaft-driven gear speeds

Dimensions

Gravely 8121 Tires
Lawn/turf front
16x7.50-8
Lawn/turf rear
23x10.50-12
Dimensions
Wheelbase
48 inches 121 cm
Length
75.5 inches 191 cm
Width
36.375 inches 92 cm
Height
43 inches 109 cm
Shipping weight
890 lbs 403 kg
Ground clearance
7 inches 17 cm

Photos

Gravely 8121

Gravely 8121

Fluids, Capacities & Working Autonomy

Standard fluid requirements, service intervals, and continuous runtime estimates for Gravely Lawn Tractors Gravely 8121.

Estimated Continuous Field Runtime: 8.5 hrs

Approximately 8.5 hours of continuous field operation at ~75% rated power on a full tank (5.3 gal / 20.1 L).

Estimated 75% Load Fuel Burn~0.6 gal/hr (2.4 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 8121 Specification Unit Converter

Convert power, fluid capacities, and operating weights between metric and imperial standards for Gravely Lawn Tractors Gravely 8121.

Converted Equivalents:

Horsepower (HP)12 hp
Kilowatts (kW)8.9 kW
Metric Horsepower (PS / CV)12.2 PS

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