SERVICE AND ADJUSTM

ENGINE

TO ADJUST THROTTLE CONTROL CABLE (See Fig. 31)

The throttle contro! has been preset at the factory and adjustment should not be necessary. Check adjustment as described below before loosening cable° tf adjustment is necessary, proceed as follows:

•With engine not running, move throttle control lever from slow to choke position, Slowly move lever from choke to fast position°

•Check that holes"A" in governor control lever and hole in governor'plate line-up. If holes "A"are not aligned, loosen clamp screw and movethrottle cable until holes are aligne& Tighten clamp screw securely°

GOVERNOR

GOVERNOR

CONTROL LEVER

CONTROL PLATE

 

HOLES *'A"

CLAMP

THROTTLE

 

SCREW

CABLE

FIG. 31

TO ADJUST CARBURETOR (See Fig. 32)

FINAL SETTING -

.o Start engine and allow to warm for five minutes. Make final adjustments with engine running and shift/motion control lever in neutral (N) position.

*Move throttle control leverto stow position. With finger, rotate and ho[d throttle lever against idlespeed screwy Turn idle speed screw to attain 1750 RPM

°While still holding throttle lever'against idle speed screw, turn idle mixture vaive in (clockwise) until en- gine begins to die and then turn out (counterclockwise) until engine runs rough. Turn valve to a point midway between those two positions, Release throttle lever,

ACCELERATION TEST -

•Move throttle control lever from slow to fast position. If engine hesitates or dies, turn idle mixture valve out (counterclockwise) 1/8 turn. Repeat test and continue

to adjust, if necessary, until engine accelerates smoothly.

High speed stop is factory adjusted. Do not adjust - damage may result.

IMPORTANT: NEVER TAMPER WITH THE ENGINE GOVERNOR, WHICH IS FACTORY SET FOR PROPER ENGINE SPEED. OVERSPEEDING THE ENGINE ABOVE

THE FACTORY HIGH SPEED SETTtNG CAN BE DANGEROUS., IFYOU THINKTHE ENGINE-GOVERNED HIGH SPEED NEEDS ADJUSTING, CONTACT YOUR

NEAREST AUTHORIZED SERVICE CENTER/

DEPARTMENT, WHICH HAS PROPER EQUIPMENT AND

EXPERIENCE TO MAKE ANY NECESSARY ADJUSTMENTS_

THROTTLE

IDLE SPEED

LEVER

SCREW

The carburetor has been preset at the factory and adjust- ment should not be necessary. However, minor adjust- ment may be required tocompensate for differences infuel, temperature, altitude or load. if the carburetor does need adjustment, proceed as follows:

In general, turning idle mixture valve in (clockwise) de- creases the supply offuel tothe engine givinga leaner rue!/ air mixture. Turning the idle mixture valve out (counter- clockwise)increases the supply of fuel to the engine giving a richer fuel!air mixture_

IMPORTANT: DAMAGE TO THE NEEDLE VALVE AND THE SEAT IN CARBURETOR MAY RESULT IF SCREW IS TURNED IN TOO TIGHT.

PRELIMINARY SETTING -

•Air cleaner assembly must be assembled to the carbu- retor when making carburetor adjustments_

•Be sure the throttle control cable is adjusted propedy (see above),

oWith engine off turn idle mixture valve in (clockwise) closing it finger tight and then turn out (counterclock_ wise) 1 full tum.

IDLE MIXTURE

VALVE

FIG. 32

o6

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Sears 917.258473 owner manual Service and Adjustm, To Adjust Throttle Control Cable See Fig, To Adjust Carburetor See Fig
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917.258473 specifications

The Sears 917.258473 is a versatile lawn tractor that has earned a reputation for its reliability and performance in the field of gardening and landscaping. Designed to cater to a range of lawn care needs, this model combines innovative technology with user-friendly features, making it an excellent choice for both novice and experienced gardeners.

At the heart of the Sears 917.258473 is a powerful engine, typically offering a robust horsepower that ensures efficient mowing, trimming, and yard maintenance. This engine is designed for durability and ease of starting, often featuring an automatic choke system. The tractor's high-performance capabilities allow it to tackle larger lawns and uneven terrains with ease.

One of the standout features of the Sears 917.258473 is its cutting deck. With multiple cutting heights available, users can customize the length of their grass according to seasonal needs or personal preferences. The reinforced deck is not only sturdy but also designed for efficient grass collection and minimal clumping, ensuring a clean and polished lawn after each mow.

Maneuverability is another significant aspect of this lawn tractor. It is equipped with an ergonomic steering system that allows for easy navigation around obstacles such as trees and flower beds. The tight turning radius enhances its capability to operate in smaller yards without sacrificing performance.

Another notable characteristic is the inclusion of a hydrostatic transmission. This feature provides seamless speed adjustments without the need for manual shifting, making it simple to control the tractor's speed in various mowing conditions. Additionally, the Sears 917.258473 is often designed with a comfortable seat and user-friendly controls, allowing for prolonged periods of usage without fatigue.

Safety features are thoughtfully integrated into the design, including a seat switch that ensures the engine shuts off when the user leaves the seat. This enhances overall safety during operation, especially on slopes or uneven ground.

Overall, the Sears 917.258473 represents a great investment for homeowners seeking an efficient and reliable lawn care solution. With its potent engine, adjustable cutting deck, ease of maneuverability, and advanced technologies, it stands as a competitive option in the realm of lawn tractors, helping users achieve their desired lawn aesthetics with minimal effort.
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