Trouble Shooting - McCulloch M48 Owner's Manual

Discharge openings must be guarded at all times. Do not remove the mulching
plug or hold the safety flap up while mowing.

TROUBLE SHOOTING

PROBLEM PROBABLE CAUSE
Throttle not in CHOKE position.
Fuel tank is empty.
Air cleaner element is dirty.
Spark-plug loose.
Spark-plug leads loose or disconnect
from plug
Engine does not start.
Spark-plug gap is incorrect.
Spark-plug is defective.
Carburetor is flooded with fuel.
Faulty ignition module.
Dirt, water or stale fuel tank.
Engine difficult to start
Vent hole in fuel tank cap is plugged.
or losses power
Air cleaner element is dirty.
Spark-plug is defective.
Engine operates
Spark-plug gap is incorrect.
erratically.
Air cleaner element is dirty.
Air cleaner element is dirty.
Air slots in engine shroud are blocked.
Engine idles poorly.
Cooling fins and air passages under
engine fan housing are blocked.
Gap between electrodes or
Engine skips at speed.
spark-plug is too close.
Cooling air flow is restricted.
Engine overheats.
Incorrect spark-plug.
Cutting assembly is loose.
Mower vibrates
abnormally.
Cutting assembly is unbalanced.
WARNING
CORRECTIVE ACTION
Move throttle to CHOKE
Fill tank with fuel.
Clean air cleaner element.
Tighten spark-plug to 25-30 N•m.
Install spark-plug lead on spark plug.
Set gap between electrodes at
0.6 to 0.7mm.
Install new, correctly gapped plug.
Remove spark plug lead and remove
plug. Switch fuel tap off. Pull starter
rope 6 times to clear cylinder of fuel.
Clean and dry spark plug,then reinstall.
Contact the service agent.
Drain fuel and clean tank. Fill tank with
clean, fresh fuel.
Clean or replace fuel tank cap.
Clean air cleaner element.
Install new, correctly gapped plug.
Set gap between electrodes at
0.6 to 0.7mm.
Clean air cleaner element.
Clean air cleaner element.
Remove debris from shots.
Remove debris from cooling fins and air
passages.
Set gap between electrodes at high 0.7
to .08mm
Remove any debris from slots in
shroud, blower housing, air passages
and cooling fins on engine.
Install correct spark plug.
Check and tighten blade and cutting
plate bolts.
Check blade and cutting plate for
damaged wear. Replace all damaged or
worn components.
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