Bolens 979 manual Troubleshooting, Problem Cause Remedy

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Refer to engine manual for correct engine storage instructions.

Coat mower’s cutting blade with chassis grease to prevent rusting.

Store mower in a dry, clean area. Do not store next to corrosive materials, such as fertilizer.

NOTE: When storing any type of power equipment in a poorly ventilated or metal storage shed, care should be taken to rust-proof the equipment. Using a light oil or silicone, coat the equipment, especially cables and all moving parts.

SECTION 8: TROUBLESHOOTING

Problem

 

Cause

 

Remedy

 

 

 

 

 

Engine fails to start

1.

Blade control handle disengaged.

1.

Engage blade control handle.

 

2.

Spark plug wire disconnected.

2.

Connect wire to spark plug.

 

3.

Fuel tank empty or stale fuel.

3.

Fill tank with clean, fresh gasoline.

 

4.

Blocked fuel line.

4.

Clean fuel line.

 

5.

Faulty spark plug.

5.

Clean, adjust gap, or replace.

 

6.

Engine flooded

6.

Wait a few minutes to start engine.

Engine runs erratic

1.

Spark plug wire loose.

1.

Connect and tighten spark plug wire.

 

2.

Blocked fuel line or stale fuel.

2.

Clean fuel line; fill tank with clean, fresh

 

 

 

 

gasoline

 

3.

Vent in gas plugged.

3.

Clear vent.

 

4.

Water or dirt in fuel system.

4.

Drain fuel tank. Refill with fresh fuel.

 

5.

Dirty air cleaner.

5.

Clean air cleaner.

 

6.

Carburetor out of adjustment.

6.

Adjust carburetor.

Engine overheats

1.

Engine oil level low.

1.

Fill crankcase with proper oil.

 

2.

Air flow restricted.

2.

Remove blower housing and clean.

 

3.

Carburetor not adjusted properly.

3.

Adjust carburetor.

Occasional skip (hesitates)

1.

Spark plug gap too close.

1.

Adjust gap to .030”.

at high speed

 

 

 

 

Idles poorly

1.

Spark plug fouled, faulty or gap too

1.

Reset gap to .030” or replace spark

 

 

wide.

 

plug.

 

2.

Carburetor improperly adjusted.

2.

Adjust carburetor.

 

3.

Dirty air cleaner.

3.

Clean air cleaner.

Excessive vibration

1.

Cutting blade loose or unbalanced.

1.

Tighten blade and adapter. Balance

 

 

 

 

blade.

 

2.

Bent cutting blade.

2.

Replace blade.

Mower will not mulch grass

1.

Wet grass.

1.

Do not mow when grass is wet; wait

 

 

 

 

until later to cut.

 

2.

Excessively high grass.

2.

Mow once at a high cutting height, then

 

 

 

 

mow again at desired height or make a

 

 

 

 

narrower cutting path.

 

3.

Dull blade.

3.

Sharpen or replace blade.

Uneven cut

1.

Wheels not positioned correctly.

1.

Place all four wheels in same height

 

 

 

 

position.

 

2.

Dull blade.

2.

Sharpen or replace blade.

Wheels will not propel

1.

Belt not installed properly.

1.

Check belt for proper pulley installation

 

 

 

 

and movement.

 

2.

Debris clogging drive operation.

2.

Clean out debris with engine off.

NOTE: For repairs beyond the minor adjustments listed above, contact your nearest authorized service dealer.

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Contents OPERATOR’S Manual Table of Contents Important Safe Operation Practices General OperationSlope Operation ServiceChildren Page Slope Gauge Disconnecting Spark Plug Wire Setting Up Your Lawn MowerAssembling Your Lawn Mower Removing Unit From CartonKnow Your Lawn Mower Stopping EngineOperating Your Lawn Mower Mulching Attaching The Grass BagAttaching Side Discharge Chute Emptying the Grass BagCutting Height Adjustment Handle Height AdjustmentDrive Clutch Control Adjustment Shift Lever Cable AdjustmentEngine Adjustments General Recommendations Customer ResponsibilitiesMaintenance Cutting Blade Removal, Replacement, and SharpeningLubrication EngineDrive Belt Removal and Replacement Control Storing your Lawn MowerArm Troubleshooting Problem Cause RemedyPage Model Part Description 747-0824 Control HandleModel 25 -0807 Spacer .385 ID x .624 OD 782-0568 Page Page MANUFACTURER’S Limited Warranty for