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Bolens 3112G ST120 Specifications
The Bolens 3112G ST120 is a 2-wheel drive garden tractor from Suburban series. This model was manufactured from 1987 to 1988. The driveline consists of 28.4 cu.in (465 cc) Briggs and Stratton 281707 4-cycle single cylinder vertical shaft air-cooled gasoline engine with a rated power of 12 Hp (8.9 kW), and belt-driven gear transmission with 5 forward and 1 reverse gears. The Bolens 3112G ST120 is equipped with a manual steering system, electric PTO, mechanical disc brakes, 15x6.00-6 front tires, and 20x8.00-10 rear tires.
The operating weight is 506 lbs (230 kg). The Bolens 3112G tractor is compatible with the following attachments: 36" mid-mount 2-blade mower deck, 38" front-mount one-stage snowblower, 38" front-mount two-stage snowblower, and 42" front-mount blade.
| Engine Specs |
Engine Model ...................... Briggs and Stratton 281707
Engine Type ...................... 4-cycle single cylinder vertical-shaft air-cooled gasoline
Number of Cylinders ...................... 1
Displacement, cu.in (cc) ...................... 28.4 (465)
Cylinder Bore, in (mm) ...................... 3.44 (87.0)
Piston Stroke, in (mm) ...................... 3.06 (78.0)
Engine Power, hp (kW) ...................... 12.0 (8.9)
Rated Engine Speed, rpm ...................... 3600
Idle Speed, rpm ...................... 1500
Fuel System ...................... Carburetor
Carburetor Type ...................... Fixed main jet
Governor Type ...................... Mechanical
Lubrication System ...................... Pressure lube
Air Cleaner Type ...................... Dry with foam precleaner
Spark Plug Gap, in (mm) ...................... 0.030 (0.76)
Intake Valve Clearance, in (mm) ...................... 0.003-0.005 (0.08-0.13)
Exhaust Valve Clearance, in (mm) ...................... 0.003-0.005 (0.08-0.13)
Fuel Tank Capacity, gal (L) ...................... 5.0 (19.0)
Oil Capacity, qts (L) ...................... 1.5 (1.4)
| Electrical System |
Electrical System Rating, Volts ...................... 12
Charging System ................... Alternator
Alternator Rating, Volts ................... 16
Starter Type ...................... Electric
Number of Batteries ...................... 1
Battery Voltage, Volts ...................... 12
Electric Ground ...................... Negative
| Power Take Off |
PTO Operational Type ...................... Independent
PTO Clutch ...................... Electric
PTO Speed, rpm ...................... 3600
| Transmission |
Transmission Model ...................... Peerless 801
Transmission Type ...................... Belt-driven gear
Gearbox Type ...................... 5F/1R
Number of Forward Gears ...................... 5
Number of Reverse Gears ...................... 1
Maximum Forward Speed, mph (kph) ...................... 5.0 (8.0)
Maximum Reverse Speed, mph (kph) ...................... 2.2 (3.5)
| Wheels and Tires |
Wheel Drive System ...................... 2WD 4x2
Steering Configuration ...................... Front steer
Steering System ...................... Manual
Brakes Type ...................... Mechanical disc
Front Tire Size ...................... 15x6.00-6
Rear Tire Size ...................... 20x8.00-10
| Dimensions and Weight |
Wheelbase, in (mm) ...................... 45 (1140)
Overall Length, in (mm) ...................... 69 (1750)
Overall Height, in (mm) ...................... 42.5 (1070)
Overall Width, in (mm) ...................... 34.5 (870)
Ground Clearance, in (mm) ...................... 7 (175)
Operating Weight, lbs (kg) ...................... 506 (230)
| Mower Deck |
Mower Deck Type ...................... Mid-mount
Number of Blades ...................... 2
Cutting Width, in (mm) ...................... 36 (910)
Lift System (Std) ...................... Mechanical
Lift System (Opt) ...................... Electric
| Snow Blower |
Snowblower Type ...................... Front-mount, single-stage
Clearing Width, in (mm) ...................... 38 (960)
Lift System (Std) ...................... Mechanical
Lift System (Opt) ...................... Electric
| Front Blade |
Blade Type ...................... Front-mount
Width, in (mm) ...................... 42 (1060)
Lift System (Std) ...................... Mechanical
Lift System (Opt) ...................... Electric
Angle ...................... Manual
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| Garden Tractors Technical Specifications |