Gravely lawn tractors

Gravely 8121

The Gravely 8121 is a garden tractor introduced in 1978 as part of the 8000 Series by Gravely. It features a 12 hp Kohler K301 476cc 1-cylinder air-cooled gasoline engine, an 8-speed shaft-driven gear transmission with 4 reverse speeds, and two-wheel drive with manual steering. The tractor has a hydraulic lift variant and an open operator station. It includes a mid independent PTO with mechanical clutch, an open center hydraulic system, and a fuel capacity of 5.3 gallons. The 8121 rides on 16x7.50-8 front tires and 23x10.50-12 rear tires, with a wheelbase of 48 inches and a weight of 890 lbs. Electrical system features a 12-volt battery and a 15-amp flywheel alternator charging system.

Power12 hp

Founded-

Model8121

View Images

Technical Specifications

Detailed specifications and technical data for Gravely 8121

Engine

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

Capacity

Fuel	5.3 gal (20.1 L)
Hydraulic system	0.375 gal (1.4 L)

Variants

8120	mechanical lift
8121	hydraulic lift

Electrical

Ground	negative
Battery AH	42
Battery volts	12
Charging amps	15
Charging system	flywheel alternator

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)

Mechanical

Drive	Two-wheel drive
Brakes	Mechanical band brakes
Steering	Manual steering
Operator station	Open operator station

Production

Type	Garden tractor
Series	8000 Series
Manufacturer	Gravely
Year introduced	1978

Transmission

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

Dimensions & Tires