Same brandLawn and Garden tractorsSpec sheet
Bolens 3212H ST120
The Bolens 3212H ST120 is a compact lawn and garden tractor made from 1988 to 1992. It's perfect for small yards and light garden work. This tractor has a 2-wheel drive system and manual steering, making it easy to use in tight spaces. The heart of this tractor is a Briggs & Stratton 281707 engine. It's a single-cylinder, air-cooled gasoline engine that puts out 12 horsepower. The engine size and power are below average compared to other tractors, but it's just right for lawn care. The tractor has a belt-driven hydrostatic transmission, which means smooth speed changes without shifting gears. It can go forward and backward at many different speeds. The 3212H ST120 is lightweight at 463 pounds, making it easy to move around. It has an open operator station and an electric starter for quick start-ups. The fuel tank holds 5 US gallons, enough for several hours of work.
ManufacturerBolensPower12 hp(8.9 kW)ClassUnder 25 HP tractors →Engine1-cylinderTransmissionBelt-driven Hydrostatic
Key specifications
- Category
- Lawn and Garden
- Engine power
- 12hp
- Operating weight
- 463 lb
- Transmission
- Belt-driven Hydrostatic
Category comparison
3212H ST120 compared with its category
vs. Lawn and Garden medianDistribution
Engine Power (hp)
All recorded Lawn and Garden tractors
12 hp · 16th
This model
4
Median 18 hp
28
This modelLawn and Garden tractorsMediann = 380
The 3212H ST120 ranks at the 16th percentile for engine power among recorded lawn and garden tractors.
Overview
About the Bolens 3212H ST120
The Bolens 3212H ST120 is a compact lawn and garden tractor made from 1988 to 1992. It's perfect for small yards and light garden work. This tractor has a 2-wheel drive system and manual steering, making it easy to use in tight spaces. The heart of this tractor is a Briggs & Stratton 281707 engine. It's a single-cylinder, air-cooled gasoline engine that puts out 12 horsepower. The engine size and power are below average compared to other tractors, but it's just right for lawn care. The tractor has a belt-driven hydrostatic transmission, which means smooth speed changes without shifting gears. It can go forward and backward at many different speeds. The 3212H ST120 is lightweight at 463 pounds, making it easy to move around. It has an open operator station and an electric starter for quick start-ups. The fuel tank holds 5 US gallons, enough for several hours of work.
Full specifications
Recorded specifications
General
| Manufacturer | Bolens |
|---|---|
| Model | 3212H ST120 |
| Category | Lawn and Garden tractor |
| Type | 4x2 |
| Years built | 1988–1992 |
| Operating weight | 463lb(210 kg) |
Engine
| Make | Briggs & Stratton |
|---|---|
| Model | 281707 |
| Power | 12hp(8.95 kW) |
| Cylinders | 1 |
| Displacement | 28.4ci(0.47 L) |
| Bore | 3.43in(87.12 mm) |
| Stroke | 3.07in(77.98 mm) |
Transmission
| Type | Belt-driven Hydrostatic |
|---|
Chassis & drive
| Chassis | 4x2 |
|---|---|
| Drive | 2WD |
| Steering | Manual |
| Brakes | Disc |
| Cab | Open Operator Station |
Power take-off
| Rear PTO | Independent with Electric Clutch |
|---|
Dimensions
| Width | 34.3in(871.2 mm) |
|---|---|
| Height | 42.1in(1,069 mm) |
| Operating weight | 463lb(210 kg) |
Tires
| Front | 15x6Shop size |
|---|---|
| Rear | 20x8Shop size |
Closest alternatives
3212H ST120 compared with the nearest models by horsepower
Among lawn and garden tractors, the Bolens 3212G and the Simplicity 4212 are closest to the Bolens 3212H ST120 in rated horsepower. The Bolens 3212G matches it on rated power at almost the same operating weight. The Simplicity 4212 matches it on rated power.
| Spec | Bolens 3212H ST120 | Bolens 3212G | Simplicity 4212 |
|---|---|---|---|
| Engine power | 12 hp8.9 kW | 12 hp8.9 kW | 12 hp8.9 kW |
| Operating weight | 463 lb210 kg | 463 lb210 kg | - |
| Weight per hp | 39 lb/hp23 kg/kW | 39 lb/hp23 kg/kW | - |
| Displacement | 28.4 ci0.47 L | 28.4 ci0.47 L | 28.6 ci0.47 L |
| Cylinders | 1 | 1 | 1 |
| Transmission | Belt-driven Hydrostatic | Belt-driven gear type | Belt-driven gear |
| Drive | 2WD | 2WD | 2WD |
| Years built | 1988-1992 | 1987-1992 | 1987-1989 |
Calculators
Calculators for the 3212H ST120
PTO power
About 10 to 11 PTO hp
Estimated from the 12 hp engine rating. The calculator also estimates drawbar power by surface.
Implement sizing
Implements a 12 hp tractor can run
The calculator sizes mowers, tillers, discs, plows and balers for this tractor.
Ballast
45 lb per PTO hp as listed
Heavy draft work calls for 130 to 150 lb/hp. The calculator gives the ballast to add.
Units
12 hp is 8.9 kW
The converter gives kW and metric PS values, as used on European spec sheets.
Parts and manuals
Parts and manuals for the Bolens 3212H ST120
Each link opens a retailer search keyed to the fields recorded for this model. Confirm fitment against the serial plate before ordering.
Filters
- Oil filter for the Briggs & Stratton 281707Amazon
Fits the Briggs & Stratton 281707 1-cylinder gasoline engine listed for this model. Confirm the part number against the engine serial plate.
- Air filter for the Briggs & Stratton 281707Amazon
Fits the Briggs & Stratton 281707 1-cylinder gasoline engine listed for this model. Confirm the part number against the engine serial plate.
- Fuel filter for the Briggs & Stratton 281707Amazon
Fits the Briggs & Stratton 281707 1-cylinder gasoline engine listed for this model. Confirm the part number against the engine serial plate.
- Hydraulic filter for the Briggs & Stratton 281707Amazon
Fits the Briggs & Stratton 281707 1-cylinder gasoline engine listed for this model. Confirm the part number against the engine serial plate.
Manuals
- Bolens 3212H ST120 service and repair manualseManualOnline
Digital manuals. Built 1988 to 1992. Check the serial number range on the listing.
- Bolens 3212H ST120 operator's manualAmazon
Printed and reprint manuals. Built 1988 to 1992. Check the serial number range on the listing.
- Bolens 3212H ST120 service manualAmazon
Shop and repair manuals for this model.
Tires
- 15x6 tiresAmazon
Listed front tire size for the Bolens 3212H ST120.
- 20x8 tiresAmazon
Listed rear tire size for the Bolens 3212H ST120.
Links in this section go to retailers. A purchase through them earns this site a commission at no extra cost to the buyer. As an Amazon Associate, Heavy Equipment Specs earns from qualifying purchases. Affiliate disclosure
Category medians
3212H ST120 vs. Lawn and Garden median
Bolens 3212H ST120 compared with other Lawn and Garden tractors
| Spec | This model | Lawn and Garden median | Difference | Percentile |
|---|---|---|---|---|
| Engine Power | 12 hp | 18 hp | -33% | 16th |
| Engine Displacement | 28.4 ci | 41.1 ci | -31% | 19th |
| Cylinders | 1 | 2 | -50% | 17th |
| Operating Weight | 463 lb | 738 lb | -37% | 10th |
| Width | 34.3 in | 43.3 in | -21% | 9th |
| Height | 42.1 in | 42.9 in | -2% | 40th |
Medians and percentiles are calculated from the lawn and garden tractors in the database that have a recorded value for each specification (sample size 269–380 models).
Same manufacturer
Other Bolens models
Other manufacturers
Models with similar horsepower
Gallery
Bolens 3212H ST120 photos
FAQ
Frequently asked questions
When was the Bolens 3212H ST120 made?
The Bolens 3212H ST120 was manufactured from 1988 to 1992.
What size tires does the Bolens 3212H ST120 use?
The Bolens 3212H ST120 is fitted with 15x6 front tires and 20x8 rear tires from the factory.
What is the engine power output of the Bolens 3212H ST120?
Rated engine output for the Bolens 3212H ST120 is 12 hp, delivered by a 1-cylinder engine. The engine displaces 28.4 ci.
What is the operating weight of the Bolens 3212H ST120?
The Bolens 3212H ST120 has an operating weight of about 463 lb.
Which transmission does the Bolens 3212H ST120 use?
The Bolens 3212H ST120 is equipped with a Belt-driven Hydrostatic transmission.
How do I maintain a Bolens 3212H ST120?
Routine service for the Bolens 3212H ST120 covers engine oil and filter changes, hydraulic and coolant level checks, air filter cleaning, and scheduled inspections. Refer to the manufacturer's maintenance schedule for exact intervals.