Husqvarna YTH150 To Adjust Throttle Control Cable See Fig, To Adjust Carburetor See Fig

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SERVICE AND ADJUSTMENTS

ENGINE

TO ADJUST THROTTLE CONTROL CABLE (See Fig. 32)

The throttle control has been preset at the factory and adjustment should not be necessary. Check adjustment as described below before loosening cable. If 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 to see if hole in throttle lever and hole in speed control bracket are aligned.

•If holes are not aligned, loosen cable clamp screw and align the holes by inserting a pencil or a 1/4" drill bit through both holes.

•Pull throttle cable up to remove slack and tighten cable clamp screw. Remove alignment pencil or drill bit.

CABLE

CLAMP

SCREW

SPEED CONTROL

BRACKET

THROTTLE

LEVER

FIG. 32

TO ADJUST CARBURETOR (See Fig. 33)

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 needlesout (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.

NOTE: The carburetor on this engine is low emission. It is equipped with an idle fuel adjusting needle with a limiter cap, which allows some adjustment within the limits allowed by the cap. Do not attempt to remove the limiter cap. The limiter cap cannot be removed without breaking the adjusting needle.

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

•Start engine and allow to warm for five minutes. Make 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 adjustment needlein (clock- wise) until engine begins to die and then turn out (counterclockwise) until engine runs rough. Turn needle to a point midway between those two positions.

•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. 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 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. 33

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Contents YTH150 IV. Service Safe Operation Practices for Ride-On MowersGeneral Operation II. Slope OperationProduct Specifications Customer ResponsibilitiesModel Number YTH150 Serial Table of Contents Contents of Hardware Pack Assembly Tools Required for AssemblyHOW to SET UP Your Tractor To Remove Tractor from CartonInstall Seat See Fig To Attach Front Bumper See FigTo Attach Nose Roller See Fig Install Mulcher Plate See Figs Assemble Gauge Wheels to Mower Deck See FigTo Convert to Bagging or Discharging Check Tire Pressure Check Deck LevelnessCheck for Proper Position of ALL Belts Check Brake SystemOperation Know Your Tractor HOW to USE Your Tractor Before Starting the Engine To Operate Mower See aTo Operate on Hills To Transport See FigsADD Gasoline To Start Engine See FigPurge Transmission Hydrostatic Transmission Warm UPMowing Tips Mulching Mowing TipsLubrication Chart Customer ResponsibilitiesGeneral Recommendations Before Each USETractor To Service PRE-CLEANER To Service CartridgeEngine LubricationCleaning Clean AIR INTAKE/COOLING AreasMuffler Spark PlugsService and Adjustments To Install Mower See FigTo Level Mower Housing To Remove Mower See Fig To Adjust Brake See Fig Belt Installation To Replace Mower Blade Drive Belt See Fig Belt RemovalTransmission REMOVAL/REPLACEMENT To Adjust Steering Wheel AlignmentTo Replace Motion Drive Belt See Fig Front Wheel TOE-IN/CAMBERTo Replace Headlight Bulb Interlocks and RelaysTo Replace Fuse To Adjust Throttle Control Cable See Fig To Adjust Carburetor See FigAcceleration Test Storage OtherFuel System Engine OILTroubleshooting Points Problem Cause CorrectionOFF Service Notes Schematic Ignition SwitchPTO Switch Wiring Insulated ClipsElectrical KEY Part NO. NO. Description Chassis and Enclosures KEY Part Description Repair Parts KEY Part NO. no Description Repair Parts Steering Assembly KEY Part Description NO. noSeat Assembly KEY Part NO. no DescriptionDecals Wheels & TiresLSB42 LBD48Engine KEY Part NO. NO. Description Mower Deck KEY Part Description Mower Lift 25 24KEY Part NO. NO. Description Hydro Gear Transaxle Model Number KEY Part Description Service Notes Service Notes CUT This OUT Dotted Lines SlopeWarranty Statement Limited Warranty532162559 Rev.1 03.11.98 RH/SJ
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