Exmark Lawn mower COMMERCIAL 21 - Manual (Page 34)

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
1. Fuel tank is empty. 1. Fill the fuel tank.
2. Fuel shutoff valve is closed. 2. Open the fuel shutoff valve.
3. The throttle lever is not in the correct
position.
3. Move the throttle lever to the Choke
position.
4. Dirt, water, or stale fuel is in the fuel
system.
4. Contact an Authorized Service Dealer.
5. Faulty spark plug. 5. Clean, adjust or replace spark plug.
Engine will not start, starts hard, or fails to
keep running.
6. Spark plug wire is not connected. 6. Check the spark plug wire connection.
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
system.
5. Contact an Authorized Service Dealer.
Engine loses power.
6. The underside of the lawn mower deck
contains clippings and debris.
6. Clean the underside of the lawn mower
deck.
1. The wire is not connected to the spark
plug.
1. Connect the wire to the spark plug.
2. Faulty spark plug. 2. Clean, adjust or replace spark plug.
3. The throttle lever is not in the Fast
position.
3. Move the throttle lever to the Fast
position.
Engine runs rough.
4. The air filter element is dirty and is
restricting the air flow.
4. Clean the air filter pre-cleaner and/or
replace the paper air filter.
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
contains clippings and debris.
3. Clean the underside of the lawn mower
deck.
Lawn mower or engine vibrates excessively.
4. The engine mounting bolts are loose. 4. Tighten the engine mounting bolts.
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.
Uneven cutting pattern.
4. The underside of the lawn mower deck
contains clippings and debris.
4. Clean the underside of the lawn mower
deck.
1. The throttle lever is not in the Fast
position.
1. Move the throttle lever to the Fast
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.
Discharge chute plugs.
5. The underside of the lawn mower deck
contains clippings and debris.
5. Clean the underside of the lawn mower
deck.
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