Kohler Command PRO CS, Service Manual

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Section 3
Troubleshooting
3
3.1
Section 3
Troubleshooting
Troubleshooting Guide
When troubles occur, be sure to check the simple
causes which, at first, may seem too obvious to be
considered. For example, a starting problem could be
caused by an empty fuel tank.
Some common causes of engine trouble are listed
below. Use these to locate the causing factors.
Engine Cranks But Will Not Start
1. Empty fuel tank.
2. Fuel shut-off valve closed.
3. Key switch or kill switch in “off” position.
4. Low oil level.
5. Dirt or water in the fuel system.
6. Clogged fuel line.
7. Spark plug lead disconnected.
8. Faulty spark plug.
9. Faulty ignition module.
Engine Starts But Does Not Keep Running
1. Restricted fuel cap vent.
2. Dirt or water in the fuel system.
3. Faulty choke or throttle controls.
4. Loose wires or connections that short the kill
terminal of ignition module to ground.
5. Faulty cylinder head gasket.
6. Faulty carburetor.
Engine Starts Hard
1. PTO drive is engaged.
2. Dirt or water in the fuel system.
3. Clogged fuel line.
4. Loose or faulty wires or connections.
5. Faulty choke or throttle controls.
6. Faulty spark plug.
7. Low compression.
8. Faulty ACR mechanism.
9. Weak spark/ignition.
Engine Will Not Crank
1. PTO drive is engaged.
2. Battery (if equipped) is discharged.
3. Safety interlock switch is engaged.
4. Loose or faulty wires or connections.
5. Faulty key switch or ignition switch.
6. Faulty electric starter or solenoid (electric start).
7. Pawls not engaging in drive cup (retractable
start).
8. Seized internal engine components.
Engine Runs But Misses
1. Dirt or water in the fuel system.
2. Spark plug lead loose.
3. Loose wires or connections that intermittently
short the kill terminal of ignition module to
ground.
4. Engine overheated.
5. Faulty ignition module.
6. Faulty spark plug.
7. Carburetor malfunction.
Engine Will Not Idle
1. Restricted fuel cap vent.
2. Dirt or water in the fuel system.
3. Faulty spark plug.
4. Idle fuel adjusting needle improperly set.
5. Idle speed adjusting screw improperly set.
6. Low compression.
7. Stale fuel and/or gum in carburetor.
Engine Overheats
1. Air intake/grass screen, cooling fins, or cooling
shrouds clogged.
2. Excessive engine load.
3. Low crankcase oil level.
4. High crankcase oil level.
5. Faulty carburetor.
Engine Knocks
1. Excessive engine load.
2. Low crankcase oil level.
3. Old/improper fuel.
4. Internal wear or damage.