Murray Understanding the Lawn Mower Spark Plug Gap and Troubleshooting Techniques

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F-030426L

TROUBLE SHOOTING CHART

The Engine will not start.

1.Move the throttle control lever to the FAST or START position.

2.Make sure the fuel tank is filled with clean gasoline. Do not use old gasoline.

3.On a cold engine, push the primer button (optional on some models) five times.

4.Make sure the wire for the spark plug is connected to the spark plug.

5.Adjust the Carburetor. See the “Engine Instruction Book”.

6.There is too much gasoline in the engine cylinder. Remove and dry the spark plug. Put the throttle control in the SLOW position. Pull the recoil-start grip several times. Install the spark plug. Connect the wire to the spark plug. Start the engine.

7.The engine is difficult to start in heavy or high grass. Move the mower to a clean dry surface.

8.Make sure the engine stop lever is in the operating position.

9.Make sure the fuel valve is in the ON position. See the “Engine Instruction Book”.

10.On electric start models, make sure the wiring harness is connected. Charge the battery.

The Engine will not stop.

1.Release the engine stop lever.

2.Check the engine stop cable. Replace the cable if bent or damaged.

The Engine performance is bad.

1.Check the height of cut settings. Raise the height of cut if the grass is high.

2.Check the bottom of the blade housing. Clean the blade housing of grass and other debris.

3.Check the wire to the spark plug. Make sure the wire is connected.

4.Clean the engine cooling fins of grass and other debris.

5.Check the carburetor adjustments. See the “Engine Instruction Book”.

6.Check the spark plug gap. Set the spark plug gap at 0.030”.

7.Check the amount of oil in the engine. Fill with oil if necessary.

8.Check the engine air cleaner. See the “Engine Instruction Book”.

9.The gasoline is bad. Drain and clean the fuel tank. Fill the fuel tank with clean gasoline.

10.Check the throttle control. Make sure the lever is not in the CHOKE position.

Excessive Vibration.

1.Remove the blade. Check the blade and balance if necessary. See the blade maintenance instructions.

2.Check for a bent or broken blade. A DAMAGED BLADE IS DANGEROUS AND MUST BE REPLACED.

3.Check the blade adapter. REPLACE A BROKEN BLADE ADAPTER.

4.If the vibration continues, take the mower to an Authorized Service Center.

The grass will not discharge correctly.

1.Clean the bottom of the mower housing.

2.Check for a badly worn blade. Remove and sharpen the blade. For safety, replace the blade every two years with a factory replacement blade.

3.Move the throttle control lever to the FAST position. Check the speed of the engine according to the “Engine Instruction Book”.

The grass is not cut even.

1.Check the height adjustment at each wheel. The height adjustment must be the same for each wheel.

2.Make sure the blade is sharp.

3.Check for a bent or broken blade. A DAMAGED BLADE IS DANGEROUS AND MUST BE REPLACED.

4.Check for a broken blade adapter. REPLACE A BROKEN BLADE ADAPTER.

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Contents Models MURRAY, INC. Two Year Limited Warranty Responsibility of the Owner OWNER’S InformationSafe Operation Practices for Walk-Behind Mowers III. Children Safe Mowing Guide Safe Mowing Guide Safe Mowing Guide Safe Mowing Guide Steps to Follow Before Mowing While MowingAfter Mowing Unpacking Instructions PreparationHigh LOW Models with Optional Grass BAG HOW to Empty the Grass BAG HOW to Mount the Grass BAGMulching Tips HOW to Attach the Side Mounted Discharge DeflectorFinal Assembly HOW to Prepare the EngineHOW to Start Engine HOW to Stop the EngineOperation Engine Stop LeverEngine Maintenance MaintenanceHOW to Clean Mower Housing HOW to Adjust Height of CUTBlade Service HOW to Remove the BladeHOW to Sharpen the Blade HOW to Prepare Mower for Storage Check the Level of CUTStorage for NON-FOLDING Upper Handles Engine will not start Trouble Shooting ChartMulcher Models Description Side Discharge Models Housing 7501004 Mulcher Models with 14 Rear Wheels Housing 7501001 Side Discharge Models with 14 Rear Wheels Guard, Rear 672684 Description Handle Briggs & Stratton ModelsWheel Size & Type Wheels and TiresKEY Description Grass BAG030426L 030426L 030426L MURRAY, INC. Lawn Mower Central Parts Distributors HOW to Order Repair Parts