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Sears SS18 Specifications

General Information

Tractor Model ...................... Sears SS-18 917.25960
Tractor Type ...................... Garden tractor
Manufacture Years ...................... 1976
Fuel Type ...................... Gasoline
Attachments ...................... Mower Deck, Blade and Snowblower

Sears SS18 Engine

Engine Model ...................... Onan BG-MS
Engine Type ...................... 4-cycle two cylinder air-cooled horizontal-shaft gasoline
Number of Cylinders ...................... 2
Displacement, cu.in (cc) ...................... 49.8 (816)
Engine Bore, in (mm) ...................... 3.25 (83.0)
Engine Stroke, in (mm) ...................... 3.00 (76.0)
Rated Engine Power, hp (kW) ...................... 18.0 (13.4)
Rated Engine Speed, rpm ...................... 3600
Idle Speed, rpm ...................... 1200
Compression ...................... 7.2:1
Fuel System Type ...................... Carburetor
Carburetor Type ...................... Adjustable main jet
Fuel Pump Type ...................... Mechanical
Air Cleaner Type ...................... Paper element
Spark Plug Type ...................... Champion H8
Spark Plug Gap, in (mm) ...................... 0.025 (0.63)
Breaker Point Gap, in (mm) ...................... 0.020 (0.51)
Intake Valve Clearance, in (mm) ...................... 0.007-0.009 (0.18-0.23)
Exhaust Valve Clearance, in (mm) ...................... 0.012-0.014 (0.30-0.35)
Fuel Tank Capacity, gal (L) ...................... 3.0 (11.5)
Oil Capacity, qt (L) ...................... 2.0 (1.9)

Electrical System

Electrical System Rating, Volts ...................... 12
Charging System ...................... Flywheel alternator
Charging System Rating, 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 ...................... 2000

Sears SS18 Transmission

Transmission Type ...................... Belt-driven gear
Gearbox Type ...................... 6F/2R
Number of Forward Gears ...................... 6
Number of Reverse Gears ...................... 2
Oil Capacity, qt (L) ...................... 5.0 (4.7)
Maximum Forward Speed, mph (kph) ...................... 6.5 (10.5)
Maximum Reverse Speed, mph (kph) ...................... 2.5 (4.0)

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) ...................... 44 (1115)
Overall Width, in (mm) ...................... 36.5 (920)
Weight, lb (kg) ...................... 737 (335)

Sears SS18 Attachments

42" Mower Deck

Mower Deck Type ...................... Mid-mount, right-discharge
Number of Blades ...................... 3
Cutting Width, in (mm) ...................... 42 (1060)
Cutting Height, in (mm) ...................... 1.5-4.5 (38-114)
Deck Drive ...................... Belt
Lift System ...................... Mechanical
Weight, lb (kg) ...................... 180 (81)

48" Mower Deck

Mower Deck Type ...................... Mid-mount, right-discharge
Number of Blades ...................... 3
Cutting Width, in (mm) ...................... 48 (1215)
Cutting Height, in (mm) ...................... 1.5-4.5 (38-114)
Deck Drive ...................... Belt
Lift System ...................... Mechanical
Weight, lb (kg) ...................... 187 (84)

40" Snow Blower

Snowblower Type ...................... Front-mount
Clearing Width, in (mm) ...................... 40 (1010)
Lift System ...................... Mechanical

Front Blade

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