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Troubleshooting - 31
TROUBLESHOOTING
Engine
Electrical System
If Check
Poor Engine Performance Fuel:
• Dirt in fuel system or fuel is old.
Replace fuel with fresh stabilized fuel.
Obtain fuel from another supplier
before suspecting machine problems.
Suppliers blend fuels differently and
changing suppliers will generally solve
any performance problems.
• Fuel blended with alcohol or ether
may contribute to performance
problems by causing gum and varnish
deposits, especially if fuel is stored for
several weeks or more. Obtain fresh
fuel.
Engine Will Not Start Or Is
Hard To Start
• Park brake lever not in the proper
position.
• OPC switch not depressed. Stand on
platform or adjust switch.
• Check that motion control levers are in
neutral and neutral switches are
correctly adjusted.
• PTO engaged.
• Stale or improper fuel/fuel level.
• Plugged fuel filter.
• Plugged air intake filter.
• Spark plug wires loose or
disconnected.
• Spark plugs not gapped correctly.
• Blown fuse.
• Electrical problem – dead battery.
• Choke adjusted incorrectly. See your
authorized dealer.
Engine Will Not Slow Idle • Carburetion problems. See your
authorized dealer.
• Bent or kinked throttle cable.
• Bent governor control.
• Incorrect governor idle control.
Engine Runs Rough or Stalls • Plugged fuel filter.
• Plugged air intake system.
Fuel cap vent dirty.
• Stale or improper fuel/fuel level.
• Spark plugs not gapped correctly.
• Replace spark plugs.
• Choke adjusted incorrectly. See your
authorized dealer.
Engine Knocks • Engine oil level low.
• Reduce load. (Slower ground speed.)
• Fuel is bad. Fill tank with fresh fuel,
correct octane.
• Idle speed too slow.
Engine Overheats • Clean cooling fins.
• Low oil level.
• Do not operate at slow idle. Operate
at fast idle.
• Cooling air intake screen is dirty.
• Plugged carburetor air intake filter.
• Plugged air intake filter.
• Operating at too fast ground speed for
conditions.
Engine Lacks Power • Reduce load.
• Plugged air intake system.
• Plugged fuel filter.
• Improper type of fuel. Drain tank and
fill with correct fuel.
• Clean cooling fins to help prevent
overheating.
• Replace spark plugs.
Engine Uses Too Much Oil • Find and correct oil leaks.
• Incorrect engine oil.
• Plugged oil filter.
• Plugged air intake filter.
• Worn engine components.
Engine Backfires Through
Muffler
• Throttle lever should be at low idle for
thirty seconds before turning off
machine.
High Fuel Consumption • Improper type of fuel.
• Plugged air intake system.
• Operating at too fast ground speed for
conditions.
• Improper valve clearance. See your
authorized dealer.
• Restricted air intake system.
Other Symptoms • See engine manufacturer’s owner’s
manual provided with your machine for
additional information.
If Check