Troubleshooting - Exmark NAVIGATOR NV640KC Operator's Manual

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. Do Not attempt to service or replace major
items or any items that call for special timing or adjustments procedures (such as valves, governor, etc.). Have
this work done by your Engine Service Dealer.
Note: When disconnecting electrical connectors Do Not pull on the wires to separate the connectors.
Problem
Starter does not crank.
Engine will not start, starts hard, or fails to
keep running.
Possible Cause
1. PTO is engaged.
2. Parking brake is not set.
3. Speed control lever is not in neutral
position.
4. Battery does not have a full charge.
5. Electrical connections are corroded, loose
or faulty.
6. Fuse is blown.
7. Relay or switch is defective.
1. Fuel tank is empty.
2. Fuel shutoff valve is closed.
3. Oil level in the crankcase is low.
4. The throttle and choke are not in the
correct position.
5. Dirt in fuel filter.
6. Dirt, water, or stale fuel is in the fuel
system.
7. Air cleaner is dirty.
8. Electrical connections are corroded, loose
or faulty.
9. Relay or switch is defective.
10. Faulty spark plug.
11. Spark plug wire is not connected.
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Troubleshooting
Corrective Action
1. Disengage the PTO.
2. Set the parking brake.
3. Ensure the speed control lever is in the
neutral position.
4. Charge the battery. See Check
Battery Charge and Recommended
Jump Starting Procedure sections in
Maintenance.
5. Check the electrical connections for
good contact. Clean connector terminals
thoroughly with electrical contact cleaner,
apply dielectric grease and reconnect.
6. Replace the blown fuse.
7. Contact an Authorized Service Dealer.
1. Fill the fuel tank.
2. Open the fuel shutoff valve.
3. Add oil to the crankcase.
4. Be sure the throttle control is midway
between the "SLOW" and "FAST"
positions, and the choke is in the "ON"
position for a cold engine (except Kohler
EFI) or the "OFF" position for a warm
engine.
5. Replace the fuel filter.
6. Contact an Authorized Service Dealer.
7. Clean or replace the air cleaner element.
8. Check the electrical connections for
good contact. Clean connector terminals
thoroughly with electrical contact cleaner,
apply dielectric grease and reconnect.
9. Contact an Authorized Service Dealer.
10. Clean, adjust or replace spark plug.
11. Check the spark plug wire connection.