74 TROUBLESHOOTING If you have any questions, consult your local KUBOTA Dealer. Trouble Cause Countermeasure Rough engine running. A Spark plug defective. A Adjust the spark plug gap or replace it. A High tension cord defective. A Consult your KUBOTA Dealer. A Ignition coil defective. A Consult your KUBOTA Dealer. A Fuel hose or fuel filter clogged or damaged. A Clean or replace fuel lines, and consult your KUBOTA Dealer. A Improper or stale fuel. (Fuel quality is poor.) A Replace fuel and consult your KUBOTA Dealer. A Air cleaner is clogged. A Clean or replace the air cleaner element. Exhaust fumes are colored. (Black, Dark or Gray) A Overload. A Reduce load. A Low grade fuel is used.
A Use specified fuel. A Air cleaner is clogged. A Clean or replace the air cleaner element. Exhaust fumes are colored. (White or Blue) A Excessive engine oil. A Reduce to the specified oil level. A Piston ring is worn or stuck. A Consult your KUBOTA Dealer. Engine overheats. A Engine is overloaded. A Lower speed or reduce load. A Engine oil is insufficient. A Replenish engine oil. A Low coolant level. A Fill cooling system to the correct level; check radiator and hoses for loose connections or leaks. A The motor driven fan does not turn. A Check to see if the fuse is not blown. A Check the electric system. A Dirty radiator core or grille screens. A Remove all trash.
A Coolant flow route corroded. A Flush cooling system. Engine diagnostic light comes on. --- A Consult your KUBOTA Dealer. Engine will not idle. A Spark plug defective. A Adjust the spark plug gap or replace it. A Faulty spark plug. A Replace the spark plug.