Sears 917.257643 owner manual To Adjust Carburetor See Fig, Important Damage to the Needle Valve

Page 25

SERVICE AND

TO ADJUST CARBURETOR (See Fig. 32)

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

tn general, turning idle mixture valve in (clockwise) de- creases the supply of fuel to the engine giving a leaner fuel/ air mixture. Turning the idle mixture valve out (counter- clockwise) increases the supply of fuel to the engine giving a richer fue!/air mixture.,

IMPORTANT: DAMAGE TO THE NEEDLE VALVE AND

THE SEAT IN CARBURETOR MAY RESULT tF SCREW IS TURNED IN TOO TIGHT

PRELIMINARY SE-I-FING -

=Air cleaner assembly must be assembled to the carbu- retor when making carburetor adjustments.,

. Be sure the throttle control cable is adjusted properly (see above).

•With engine off turn idle mixt[Jre valve in (clockwise) closing it finger tight and then turn out (counterclock- wise) 1 full turn.,

FINAL SETTING

ADJUST ENT$

ACCELERATION TEST -

•Move throttle control lever from slow (,_) to fast (4) 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 acceler_ ates 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 ENGINI_ABOVE

THE FACTORY HiGH SPEED SETTING CAN BE DANGEROUS, IF YOU THINK THE ENGINE-GOVERNED

HIGH SPEED NEEDS ADJUSTING, CONTACT YOUR

NEAREST AUTHORIZED SERVICE CENTER/

DEPARTMENT, WHICH HAS PROPER EQUIPMENT AND

EXPERIENCE TO MAKE ANY NECESSARY ADJUSTMENTS.

I

THROTTLE

IDLE SPEED

 

LEVER

SCREW

•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 lever to slow (._) position, With finger, rotate and hold throttle lever against idle speed screw° Turn idle speed screw to attain 1750 RPM.,

. While still holding throttle lever against idle speed screw, turn idle mixture valve 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,,

IDLE MIXTURE

VALVE

FIG. 32

25

Page 24 Page 26
Image 25
Page 24 Page 26
Contents Model Safe Operation Practices for Ride-On Mowers Safety RulesModel Limited 90=DAY Warranty on BatterySerial Number Date of Purchase Index Performance MaintenanceEngine Contents of Hardware Pack Attach Steering Wheel See Fig UnpackcartonTo Roll Tractor OFF Skid See Fig WheelInstall Seat See Fig Connect Battery See FigsNegave BoltCheck Deck Levelness Check Tire PressureCheck for Proper Position of ALL Belts Check Brake SystemInstall Mulcher Plate See Figs AssemblyTo Convert to Bagging or Discharging Guard from mower, Raise and hold OperationKnow Your Tractor Heightadjustm ENT Knob Usedtoadjustthe mower cutting heighLAttachment Clutch Lever Used to engage HOW to USE Your Tractor To Operate Mower See Fig Before Starting the EngineTo Transport ADD GasolineOperation When starting engine for the first time orif engine has runMowing Tips To Start Engine See FigBefore Each USE General RecommendationsTires Brake OperationBlade Care Blade Removal See FigBelts To Clean Battery and TerminalsTransaxle Cooling LubricationTo Service PRE-CLEANER Clean AIR Screen See FigCustomer R AIR Filter See FigSpark Plugs MufflerIN-LINEFUEL Filter See Fig To Install Mower See Fig Service and AdjustmentsTractor To Remove Mower See FigAdjustments ServiceTo Level Mower Housing To Adjust Brake See Fig AdjustmTo Replace Motion Drive Belt See Fig To Replace Mower Blade Drive BeltTo Start Engine with a Weak Battery See Fig To Adjust Steering Wheel AlignmentFront Wheel TOE-IN/CAMBER To Remove Wheel for RepairsTo Adjust Throttle Control Cable ICE and AdjustmentsEngine To Replace Headlight BulbFinal Setting To Adjust Carburetor See FigImportant Damage to the Needle Valve Preliminary SE-I-FINGStorage BatteryFuel System Engine OILCorrection Problem CauseTroucoting Points ProblemcauseCorrection Ignition Switch SchematicWiring Insulated Clips NON-REMOVABLE ConnectionsElectrical Repair PartsBulb, Light Electrical KEY Part DescriptionKey, Ignition 128 Chassis and EnclosuresKEY Part NO, NON Description Chassis AndenclosuresDrive KEY Part Description Drive KEY Part NO. noSteering Assembly Steering Assembly KEY Part NO. no Spacer, Split 28 x Seat Assembly140552 Wheels & Tires DecalsFront Tire 2122 29\ 2O EngineLine, Fuel KEY Part NO. NO. DescriptionMower Lift 15 HP 42 Tractor - Model Number161718 15 HP 42 TRACTOR-- Model Number 103 Mower Deck138440 KEY Part NO. noWith Nibs 2732 5219 Dana Transaxle Model Number105941X 20 xBriggs & Stratton Engine Model Number 28N707, Type Number 868A127 138 106 987 95 117 6346B 104 1022 105 147 Requires Specialtools To INSTALL, see RepairValve Overhaul KIT Carburetor467 872 523445 224 668 304Eo2 Eo3 801265 209 601NOo Briggs & Stratton Engine Model Number 28N707, Type Number399265 127727 394358Page Suggested Guide for SiGHTiNG Slopes for Safe Operation Owners Manual If YOU Need Repair Service Or PartsInformation Part Description

917.257643 specifications

The Sears 917.257643 is a notable riding lawn mower model that represents a blend of performance, reliability, and user-friendly features. This machine is designed to cater to homeowners seeking a robust solution for lawn care. Among its main features, the 917.257643 boasts a powerful engine that provides sufficient horsepower to handle even tougher mowing conditions. This ensures that it can tackle both small and expansive yards with ease.

One of the essential characteristics of the Sears 917.257643 is its cutting system. It typically comes equipped with a wide cutting deck, which allows for a broader swath of grass to be cut in a single pass. This feature not only enhances efficiency but also reduces the overall mowing time. The adjustable cutting height is another significant advantage, allowing users to select the desired grass length based on seasonal requirements or personal preference.

In terms of technology, the Sears 917.257643 incorporates ease of operation into its design. The intuitive control panel is easy to understand, featuring straightforward levers and buttons that allow for smooth operation. Additionally, the mower is equipped with a reliable hydrostatic transmission, providing seamless speed adjustments without the need for manual gear changes. This feature allows users to focus more on mowing rather than managing speed.

The construction of the Sears 917.257643 is robust, designed to withstand the rigors of regular use. Its durable housing and high-quality materials contribute to the longevity of the mower. Furthermore, it often includes ergonomic seating, which adds to the comfort of the operator during longer mowing sessions.

Another characteristic that stands out is its maintenance features. The mower is designed for easy access to key components, allowing for straightforward maintenance routines. Regular upkeep ensures that the lawn mower remains in excellent working order, which is crucial for long-term performance.

In summary, the Sears 917.257643 is more than just a lawn mower; it is a reliable partner in lawn maintenance. Its combination of powerful performance, advanced technologies, and user-centric features makes it a favored choice among homeowners looking to keep their lawns in pristine condition. Its durable build and ease of maintenance further enhance its appeal, ensuring that users can enjoy a well-groomed lawn for years to come.
Top Page Image Contents