Bolens 721, 521 manual Troubleshooting Guide, Problem Cause Remedy

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SECTION 8: TROUBLESHOOTING GUIDE

Problem

 

Cause

 

Remedy

 

 

 

 

 

Engine fails to start

1.

Fuel tank empty, or stale fuel

1.

Fill tank with clean fresh gasoline.

 

2.

Blocked fuel line

2.

Clean fuel line

 

3.

Key not in ON position

3.

Insert key and turn to ON position

 

4.

Spark plug wire disconnected

4.

Connect wire to spark plug.

 

5.

Faulty spark plug

5.

Clean spark plug, readjust gap, or

 

6.

Engine not primed

 

replace.

 

7.

Engine flooded with excessive priming

6.

Prime engine four times.

 

 

 

7.

Wait at least ten minutes before

 

 

 

 

starting.

Engine runs erratic

1.

Unit running on choke

1.

Move choke lever to OFF position.

 

2.

Fuel line blocked, or stale fuel

2.

Clean fuel line and fill tank with fresh,

 

 

 

 

clean gasoline.

 

3.

Water or dirt in fuel system

3.

Refer to engine manual for remedy.

 

4.

Carburetor out of adjustment

4.

Refer to engine manual for remedy.

Engine overheats

1.

Carburetor out of adjustment

1.

Refer to engine manual for instruction.

Loss of power

1.

Spark plug wire loose

1.

Connect and tighten spark plug wire.

 

2.

Vent in gas cap plugged

2.

Clear vent.

Excessive vibration

1.

Loose parts or damaged auger

1.

Stop engine immediately and

 

 

 

 

disconnect spark plug wire. Check for

 

 

 

 

possible damage. Tighten all bolts

 

 

 

 

and nuts. Repair as needed. If the

 

 

 

 

problem persists, take unit to an

 

 

 

 

authorized service dealer.

Unit fails to self-

1.

Drive cable out of adjustment

1.

Adjust control cable following

propel

 

 

 

instructions on page 9 of this manual.

 

2.

Drive belt loose or damaged

2.

Replace drive belt.

Unit fails to

1.

Discharge chute clogged

1.

Stop engine immediately and

discharge snow

 

 

 

disconnect spark plug wire. Clean

 

 

 

 

discharge chute and the auger

 

 

 

 

housing.

 

2.

Foreign object lodged in auger

2.

Stop engine immediately and

 

 

 

 

disconnect spark plug wire. Remove

 

 

 

 

object .

 

3.

Control cable not adjusted properly

3.

Adjust control cable following

 

 

 

 

instructions on page 9 of this manual.

 

4.

Drive belt loose or damaged

4.

Replace drive belt.

NOTE: For repairs beyond the minor adjustments listed above, contact your nearest authorized service representative or call 1-866-840-6483 for the Customer Support Center. Refer to the engine manual for more engine related information.

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Contents Operator’s Manual Table of Contents Preparation Important Safe Operation PracticesTraining Your Responsibility Maintenance & StorageUnpacking From Carton Items Required For AssemblyBefore Assembly Raising Upper Handle Assembling Your Snow ThrowerAuger Control Handle Know Your Snow ThrowerTo Start Engine Operating Your Snow ThrowerBefore Starting Gas and Oil Fill-UpShave Plate To Stop EngineOperating the Snow Thrower Operating TipsReplacing Belt Maintaining Your Snow ThrowerCarburetor Control CableReplacing the Auger’s Rubber Paddles EngineLubrication Problem Cause Remedy Troubleshooting GuideParts List for Models 521 Models 521 Models 521 Models 521 MANUFACTURER’S Limited Warranty for