John Deere 56 Riding Lawnmower Starting Problems

Proper Starting Configuration

• Before assuming a starting problem is the result of equipment malfunction, double-check that the controls are properly set. If the engine is cold, place the throttle control in the "choke" position; if it is warm, place the control in the "run" position. The drive clutch, which does double duty as the brake pedal, must be set to "park." Disengage the mower clutch pedal. Setting the drive clutch or mower clutch incorrectly will engage the safety system and prevent the mower from starting.

Safety Start System

• The safety start system prevents dangerous situations such as starting the mower while it is in gear or while the blades are engaged. It accomplishes this by grounding the magneto via electrical switches that only open when the pedals are set correctly. If the controls are properly set but the engine does not turn over, use an ohm meter to test the switches on the magneto, under the drive clutch pedal and mower clutch pedal, and on the ignition switch if the mower is equipped with an electric starter. Replace any bad switches.

Spark Plug and Wire

• If the safety start system is functioning properly, remove the spark plug from the engine and crank the starter while holding the tip of the plug against a ground. If the spark is weak or there is no spark, check the spark plug gap, which should be 0.030 inches. Inspect both the spark plug and wire for damage, and replace them if necessary. If the plug and wire still show no spark, remove the flywheel and check the ignition points for damage. The points should have a gap of 0.020 inches.

Fuel System and Engine

• If the ignition system is creating a strong spark and the mower still will not start, suspect a fuel system problem. Make sure the fuel is clean and fresh. Check the air filter and fuel filter for clogs. After cranking the engine with the spark plug removed, check for the smell of fuel in the engine. If there is no gasoline odor, the fuel line or carburetor jet may be clogged. If fuel odor is present, the carburetor may be incorrectly adjusted or there may be a serious engine problem preventing starting.