Husqvarna LTH140 owner manual To Adjust Carburetor See Fig, Preliminary Setting, Final Setting

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SERVICE AND ADJUSTMENTS

TO ADJUST CARBURETOR (See Fig. 34)

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 in fuel, temperature, altitude or load. If the carburetor does need adjustment, proceed as follows:

In general, turning the adjusting needles in (clockwise) decreases the supply of fuel to the engine giving a leaner fuel/air mixture. Turning the adjusting needles out (counter- clockwise) increases the supply of fuel to the engine giving a richer fuel/air mixture.

IMPORTANT: DAMAGE TO THE NEEDLES AND THE SEATS IN CARBURETOR MAY RESULT IF NEEDLE IS TURNED IN TOO TIGHT.

PRELIMINARY SETTING -

•Be sure you have a clean air filter and the throttle control cable is adjusted properly (see above).

•With engine off turn idle fuel adjusting needle in (clock- wise) closing it finger tight and then turn out (counter- clockwise) 1 turn.

FINAL SETTING -

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

•Idle speed setting - With throttle control lever in slow ( ) position, engine should idle at 1750 RPM. If engine idles too slow or fast, turn idle speed adjusting screw in or out until correct idle is attained.

•Idle fuel needle setting - With throttle control lever in slow ( ) position, turn idle fuel adjusting needle in (clockwise) until engine begins to die and then turn out (counterclockwise) approximately 1/8 to 1/4 turn to obtain best low speed performance.

•Recheck idle speed. Readjust if necessary.

ACCELERATION TEST -

•Move throttle control lever from slow () to fast () position. If engine hesitates or dies, turn idle fuel adjusting needle out (counterclockwise) 1/8 turn. Re- peat 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 SETTING CAN BE DANGEROUS. IF YOU THINK THE ENGINE-GOVERNED HIGH SPEED NEEDS ADJUSTING, CONTACT YOUR N E A R E S T A U T H O R I Z E D S E R V I C E C E N T E R / DEPARTMENT, WHICH HAS PROPER EQUIPMENT AND E X P E R I E N C E T O M A K E A N Y N E C E S S A R Y ADJUSTMENTS.

IDLE SPEED

ADJUSTING

SCREW

IDLE FUEL

ADJUSTING

NEEDLE

FIG. 34

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Contents LT H 1 4 Safe Operation Practices for Ride-On Mowers Safety RulesCustomer Responsibilities Product SpecificationsModel Number LTH140 Serial Table of Contents Contents of Hardware Pack Tools Required for Assembly AssemblyTo Remove Tractor from Carton Before Rolling Tractor OFF SkidCheck Tire Pressure HOW to SET UP Your TractorCheck Deck Levelness Check for Proper Position of ALL BeltsTo Attach Front Bumper See Fig Install Battery See FigsTo Convert to Bagging or Discharging Assemble Gauge Wheels to Mower Deck See FigKnow Your Tractor OperationHOW to USE Your Tractor To Operate on Hills Before Starting the EngineADD Gasoline To Start Engine See Fig Mowing TipsPurge Transmission Service Dates Lubrication ChartCustomer Responsibilities General RecommendationsBrake Operation TractorTires Blade CareTo Clean Battery and Terminals Battery See FigBelts Transaxle CoolingTo Service Cartridge To Service PRE-CLEANEREngine LubricationClean AIR INTAKE/COOLING Areas CleaningMuffler Spark PlugsTo Install Mower See Fig Service and AdjustmentsTo Remove Mower See Fig FRONT-TO-BACK Adjustment See Figs To Level Mower HousingTo Adjust Brake See Fig To Adjust Attachment Clutch See FigBelt Installation To Replace Mower Blade Drive Belt See FigTransmission REMOVAL/REPLACEMENT To Adjust Motion Control Lever See FigTo Replace Motion Drive Belt See Fig To Start Engine with a Weak Battery See Fig To Adjust Steering Wheel AlignmentFront Wheel TOE-IN/CAMBER To Remove Wheel for Repairs See FigTo Adjust Throttle Control Cable See Fig To Remove Hood and Grill Assembly See FigTo Replace Fuse To Replace Headlight BulbPreliminary Setting To Adjust Carburetor See FigFinal Setting Acceleration TestOther StorageProblem Cause Correction Troubleshooting PointsOFF 14 HP 42 Tractor Model NO. LTH140 954001192A SchematicElectrical KEY Part NO. NO. Description Chassis and Enclosures KEY Part NO. no Description Drive KEY Part Description Engine 532132753 Control Th/ch Steering Assembly Repair Parts 14 HP 42 Tractor Model NO. LTH140 H954001192A Seat AssemblyLBD48 DecalsLSB42 Mower KEY Part NO. no Description Mower Lift Assembly Repair Parts HYDRO-GEAR Transaxle Model no Repair Parts Service Notes Service Notes Sighting Guide Suggested Guide for Sighting Slopes for Safe OperationLimited Warranty Warranty Statement
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