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Sears GT18 Specifications

General Information

Tractor Model ...................... Sears GT-18
Tractor Type ...................... Garden tractor
Manufacture Years ...................... 1978-1980
Fuel Type ...................... Gasoline
Attachments ...................... Mower Deck, Blade and Snowblower

Sears GT18 Engine

Engine Model ...................... Onan B48M
Engine Type ...................... 4-Cycle air-cooled gasoline engine
Number of cylinders ...................... Two
Displacement, cu in (L) ...................... 47.7 (0.780)
Engine Bore, in (mm) ...................... 3.25 (83.0)
Engine Stroke, in (mm) ...................... 2.88 (73.0)
Rated Engine Power, hp (kW) ...................... 18.0 (13.4)
Rated Engine Speed, rpm ...................... 3600
Idle Speed, rpm ...................... 1200
Compression ratio ...................... 6.6:1
Fuel System Type ...................... Carburetor
Carburetor Model ...................... Nikki
Carburetor Type ...................... Fixed main jet
Fuel Pump Type ...................... Vacuum diaphragm
Cooling System ...................... Air-cooled
Ignition Timing, deg ...................... 21 BTC
Spark Plug ...................... Champion RH18Y
Spark Plug Gap, in (mm) ...................... 0.025 (0.64)
Point Gap, in (mm) ...................... 0.021 (0.53)
Intake Valve Clearance, in (mm) ...................... 0.007-0.008 (0.17-0.20)
Exhaust Valve Clearance, in (mm) ...................... 0.012-0.013 (0.30-0.33)
Fuel Tank Capacity, gal (L) ...................... 2.0 (7.6)
Oil Capacity, qts (L) ...................... 4.0 (3.8)

Electrical System

Electrical System Rating, Volts ...................... 12
Charging System, Amps ...................... 15
Starter Type ...................... Electric
Number of Batteries ...................... 1
Electric Ground ...................... Negative

Power Take Off

PTO Operational Type ...................... Independent
PTO Clutch ...................... Mechanical
PTO Speed, rpm ...................... 3000

Sears GT18 Transmission

Transmission Model ...................... Peerless
Transmission Type ...................... Belt-driven gear
Gearbox Type ...................... 6F/2R
Number of Forward Gears ...................... 6
Number of Reverse Gears ...................... 2
Clutch Type ...................... Mechanical idler pulley
Oil Capacity, qt (L) ...................... 5.0 (4.7)
Maximum Forward Speed, mph (kph) ...................... 6.0 (9.6)
Maximum Reverse Speed, mph (kph) ...................... 2.5 (3.6)

Transmission Type ...................... Belt-driven hydrostatic
Number of Forward Gears ...................... Infinite
Number of Reverse Gears ...................... Infinite
Oil Capacity, qt (L) ...................... 4.5 (4.3)
Maximum Forward Speed, mph (kph) ...................... 6.5 (10.5)
Maximum Reverse Speed, mph (kph) ...................... 2.6 (3.7)

Wheels and Tires

Drive Wheels ...................... 2WD 4x2
Steering Configuration ...................... Front steer
Steering System ...................... Manual
Front Tire Size ...................... 16x6.50x8
Rear Tire Size ...................... 23x10.00x12

Dimensions and Weight

Wheelbase, in (mm) ...................... 47 (1190)
Length, in (mm) ...................... 68.5 (1730)
Height, in (mm) ...................... 41 (1035)
Overall Width, in (mm) ...................... 36.5 (920)
Weight (6-Speed), lb (kg) ...................... 619 (280)
Weight (Hydro), lb (kg) ...................... 688 (312)

Sears GT18 Attachments

42" Mower Deck

Mower Deck Type ...................... Mid-mount, right-discharge
Number of Blades ...................... 3
Cutting Width, in (mm) ...................... 42 (1060)
Overall Width, in (mm) ...................... 58 (1470)
Cutting Height, in (mm) ...................... 1.5-4.5 (38-114)
Deck Drive ...................... Belt
Lift System ...................... Mechanical
Weight, lb (kg) ...................... 172 (78)

48" Mower Deck

Mower Deck Type ...................... Mid-mount, right-discharge
Number of Blades ...................... 3
Cutting Width, in (mm) ...................... 48 (1215)
Overall Width, in (mm) ...................... 64 (1620)
Cutting Height, in (mm) ...................... 1.5-4.5 (38-114)
Deck Drive ...................... Belt
Lift System ...................... Mechanical
Weight, lb (kg) ...................... 184 (83)

42" Snow Blower

Snowblower Type ...................... Front-mount
Clearing Width, in (mm) ...................... 42 (1060)
Lift System ...................... Mechanical
Weight, lb (kg) ...................... 253 (114)

Front Blade

Blade Type ...................... Front-mount
Width, in (mm) ...................... 46 (1160)
Height, in (mm) ...................... 17 (430)
Lift System ...................... Mechanical
Angle ...................... Manual
Weight, lb (kg) ...................... 113 (51)