Sears SS/18 Twin 917.25960

The Sears SS/18 Twin 917.25960 is a tractor produced by Sears Lawn Tractors. It is equipped with a 816 cc 49.8 ci engine. The listed engine power is Gasoline (gross): 18 hp / 13.4 kW. Transmission: 6 forward and 2 reverse. Operating weight: 707 lbs 320 kg.

Engine Power

Gasoline (gross): 18 hp / 13.4 kW

Fuel & Capacities

3.5 gal 13.2 L

Transmission

6 forward and 2 reverse

Operating Weight

707 lbs 320 kg

Overview

	1976 Garden tractorRoper built Garden tractor Roper built

Production
Distributor	Sears
Manufacturer	Roper
Garden tractor
Original price was $1,884 in 1976

Sears SS/18 Twin Engine
18HP Onan 816cc 2-cyl gasoline
Fuel tank	3.5 gal 13.2 L
Engine details ...

Sears SS/18 Twin Transmission
6-speed gear
Transmission details ...

Mechanical
Two-wheel drive
Manual steering
Open operator station.

Tractor hitch
Type	Sears 3-point hitch OptOptional

Dimensions & Tires
Weight	707 lbs 320 kg
Front tire	16x6.50-8
Rear tire	23x10.00-12
Full dimensions and tires ...

Electrical
Ground	negative
Battery volts	12

References

Yard and Garden Tractors and Attachments published in 1976, by Sears
Suburban, Farm and Ranch Catalog published in 1976, by Sears
Spring/Summer Catalog published in 1976, by Sears

Engine

Engine Detail — 816 cc / 49.8 ci Gasoline

Manufacturer	Onan BG-MS
Fuel Type	Gasoline
Configuration	2-cylinder, air-cooled horizontal-shaft opposed-twin
Displacement	816 cc 49.8 ci
Bore/Stroke	3.25x3.00 inches 83 x 76 mm
Power (gross)	18 hp 13.4 kW
Starter	electric
Starter volts	12

Sears SS/18 Twin Engine

Transmission

Transmission — 6 forward and 2 reverse belt-driven gear

Type	belt-driven gear
Gears	6 forward and 2 reverse
Three gears (1-3) plus reverse (R) with two ranges (low/high).

Dimensions

Sears SS/18 Twin Tires
Lawn/turf front	16x6.50-8
Lawn/turf rear	23x10.00-12

Dimensions
Length	68.5 inches 173 cm
Width	36.5 inches 92 cm
Height (steering wheel)	41.4 inches 105 cm
Shipping weight	707 lbs 320 kg

Attachments

Attachment overview
42" mid-mount mower deck
48" mid-mount mower deck
Snowblower
Blade
Front-end loader
Garden tractors are capable of using tillers, plows, or other ground-engaging attachments. TractorData does not list details of these attachments.

Photos

Sears SS/18 Twin, left side.

Sears SS/18 Twin, right side.

Recommended Implements & Sizing Guide

Engineering recommendations for Sears Lawn Tractors Sears SS/18 Twin 917.25960 based on its 18 HP power envelope and ASAE agricultural standards.

Implement & Operation	Recommended Size	Workload Rating	Engineering Notes
Moldboard PlowPrimary Tillage	1 to 2 Bottom (12")1 - 2 铧 (30 cm)	Light Duty	Ideal for garden plots and light sandy soil.
Rotary Cutter / MowerMowing & Clearing	4 ft (48 in)1.2 m	Light Duty	Pasture clipping and light brush under 1" diameter.
Rotary TillerSeedbed Prep	42 to 48 in105 - 120 cm	Light Duty	Covers compact tractor tire width.

Sizing & Soil Condition NoteActual implement sizing varies depending on local soil conditions (heavy clay vs sandy loam), field slope, and operating speed. Heavy tillage implements may require front ballast weights and wheel weights.

Fluids, Capacities & Working Autonomy

Standard fluid requirements, service intervals, and continuous runtime estimates for Sears Lawn Tractors Sears SS/18 Twin 917.25960.

Estimated Continuous Field Runtime: 3.7 hrs

Approximately 3.7 hours of continuous field operation at ~75% rated power on a full tank (3.5 gal / 13.2 L).

Estimated 75% Load Fuel Burn~0.9 gal/hr (3.5 L/hr)

Engine Crankcase Oil

SAE 15W-40 (Heavy Duty Diesel)

Standard Spec: API CK-4 / CJ-4 Heavy Duty

Service Interval: 150 – 250 Hours

Transmission & Hydraulic System

UTTO (Universal Tractor Transmission Oil)

Standard Spec: ISO VG 46 / 68 (Wet Brake & Trans Compatible)

Service Interval: 600 – 1000 Hours

Engine Cooling System

50/50 Ethylene Glycol Pre-mix

Standard Spec: ASTM D6210 / Heavy-Duty OAT Antifreeze

Service Interval: 2 Years / 1500 Hours

Sears Lawn Tractors Sears SS/18 Twin 917.25960 Specification Unit Converter

Convert power, fluid capacities, and operating weights between metric and imperial standards for Sears Lawn Tractors Sears SS/18 Twin 917.25960.

Enter value:

Unit:

Converted Equivalents:

Horsepower (HP)18 hp

Kilowatts (kW)13.4 kW

Metric Horsepower (PS / CV)18.2 PS

Direct Competitor Comparison

Compare Sears SS/18 Twin 917.25960 against same-era industry alternatives in the same horsepower class.

Current Model

Sears Lawn Tractors