Swisher ZT18542 M - Manual (Page 6)

ENGINE CRANKS BUT WON’T START
Checks for electrical problems
•While turning ignition switch to its first position, listen for the fuel solenoid on the
carburetor to click. It must click to supply fuel to the carburetor.
•Try a new spark plug.
•Check for spark at plug when it is removed and the threaded end is grounded.
•Unplug the six-position socket that connects engine wiring to mower wiring harness.
Engine will still crank. If plug doesn’t have a spark now, ignition module is probably
defective.
Checks for mechanical problems
•Make sure the tank gas valve is turned on.
•Remove air filter element to check for signs of gas in the throat of the carburetor.
•If no gas, check to see if choke is working properly.
•If all above checks show positive, carburetor must have an internal problem. Remove and
clean the carburetor.
ENGINE STALLS WHEN PTO IS ENGAGED
The seat safety switch plug not being properly inserted, or a
defective plug can cause this problem. If the plug is not
inserted or is defective, the spark plug is grounded out when
the PTO is engage.
To check, remove plug from the PTO switch. Using an
ohmmeter, place one probe on the terminal connected to the
black wire going to the seat safety switch plug. Place the
other probe on a good chassis ground. The meter should be
on zero with no weight on the seat. Pulling the seat down
should open the circuit.
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