Troubleshooting

Troubleshooting

Important: It is essential that all operator safety mechanisms be connected and in proper operating condition prior to mower use.

When a problem occurs, Do Not overlook the simple causes. For example: starting problems could be caused by an empty fuel tank.

The following table lists some of the common causes of trouble. If a problem continues, contact an Authorized Service Dealer.

Problem

 

Possible Cause

 

Corrective Action

 

 

 

 

 

Engine will not start, starts hard, or fails to

1.

Fuel tank is empty.

1.

Fill the fuel tank.

keep running.

2.

Fuel shutoff valve is closed.

2.

Open the fuel shutoff valve.

 

 

3.

The throttle lever is not in the correct

3.

Move the throttle lever to the Choke

 

 

position.

 

position.

 

4.

Dirt, water, or stale fuel is in the fuel

4.

Contact an Authorized Service Dealer.

 

 

system.

 

 

 

5.

Faulty spark plug.

5.

Clean, adjust or replace spark plug.

 

6.

Spark plug wire is not connected.

6.

Check the spark plug wire connection.

 

 

 

 

 

Engine loses power.

1.

Air cleaner is dirty.

1.

Clean or replace the air cleaner element.

 

2.

Oil level in the crankcase is low.

2.

Add oil to the crankcase.

 

3.

Vent hole in the fuel cap is plugged.

3.

Clean or replace the fuel cap.

 

4.

Dirt in fuel filter.

4.

Replace the fuel filter.

 

5.

Dirt, water, or stale fuel is in the fuel

5.

Contact an Authorized Service Dealer.

 

 

system.

 

 

 

6.

The underside of the lawn mower deck

6.

Clean the underside of the lawn mower

 

 

contains clippings and debris.

 

deck.

 

 

 

 

 

Engine runs rough.

1.

The wire is not connected to the spark

1.

Connect the wire to the spark plug.

 

 

plug.

 

 

 

2.

Faulty spark plug.

2.

Clean, adjust or replace spark plug.

 

3.

The throttle lever is not in the Fast

3.

Move the throttle lever to the Fast

 

 

position.

 

position.

 

4.

The air filter element is dirty and is

4.

Clean the air filter pre-cleaner and/or

 

 

restricting the air flow.

 

replace the paper air filter.

 

 

 

 

 

Lawn mower or engine vibrates excessively.

1.

The blade is bent or is out of balance.

1.

Balance the blade. If the blade is bent,

 

 

 

 

replace it.

 

2.

The blade mounting bolt is loose.

2.

Tighten the blade mounting bolt.

 

3.

The underside of the lawn mower deck

3.

Clean the underside of the lawn mower

 

 

contains clippings and debris.

 

deck.

 

4.

The engine mounting bolts are loose.

4.

Tighten the engine mounting bolts.

 

 

 

 

 

Uneven cutting pattern.

1.

All four wheels are not at the same height.

1.

Place all four wheels at the same height.

 

2.

The blade is dull.

2.

Sharpen and balance the blade.

 

3.

Mowing in the same pattern repeatedly.

3.

Change the mowing pattern.

 

4.

The underside of the lawn mower deck

4.

Clean the underside of the lawn mower

 

 

contains clippings and debris.

 

deck.

 

 

 

 

 

Discharge chute plugs.

1.

The throttle lever is not in the Fast

1.

Move the throttle lever to the Fast

 

 

position.

 

position.

 

2.

Cutting too much grass in one pass

2.

Raise the cutting height. If necessary, cut

 

 

 

 

a second time at lower cutting height.

 

3.

Mowing too fast.

3.

Slow down.

 

4.

The grass is wet.

4.

Allow the grass to dry before mowing.

 

5.

The underside of the lawn mower deck

5.

Clean the underside of the lawn mower

 

 

contains clippings and debris.

 

deck.

 

 

 

 

 

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Exmark COMMERCIAL 21 manual Troubleshooting, Problem Possible Cause Corrective Action

COMMERCIAL 21 specifications

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