Makita PLM4817 Manuel D'instructions page 16

15. TROUBLESHOOTING
PROBLEM
Engine does not start.
Engine difficult to start or
loses power.
Engine operates
erratically.
Engine idles poorly.
Engine skips at high
speed.
Engine overheats.
Mower vibrates
abnormally.
16
PROBABLE CAUSE
Throttle chock not in the correct position
for the prevailing conditions.
Fuel tank is empty.
Air cleaner element is dirty.
Spark plug loose.
Spark plug wire loose or disconnected
from plug.
Spark plug gap is incorrect.
Spark plug is defective.
Carburetor is flooded with fuel.
Faulty ignition module.
Dirt, water, or stale fuel tank.
Vent hole in fuel tank cap is plugged.
Air cleaner element is dirty.
Spark plug is defective.
Spark plug gap is incorrect.
Air cleaner element is dirty.
Air cleaner element is dirty.
Air slots in engine shroud are blocked.
Cooling fins and air passages under
engine blower housing are blocked.
Gap between electrodes of spark plug is
too close.
Cooling air flow is restricted.
Incorrect spark plug.
Cutting assembly is loose.
Cutting assembly is unbalanced.
CORRECTIVE ACTION
Move throttle chock to correct position.
Fill tank with fuel: refer to ENGINE
OWNERS MANUAL.
Clean air cleaner element: refer to
ENGINE OWNERS MANUAL.
Tighten spark plug to 25 – 30 N•m.
Install spark plug wire on spark plug.
Set gap between electrodes at 0.7 to
0.8 mm.
Install new, correctly gapped plug: refer to
ENGINE OWNERS MANUAL.
Remove air cleaner element and pull
starter rope continuously until carburetor
clears itself and install air cleaner
element.
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: refer to
ENGINE OWNERS MANUAL.
Set gap between electrodes at 0.7 to
0.8 mm.
Clean air cleaner element: refer to
ENGINE OWNERS MANUAL.
Clean air cleaner element: refer to
ENGINE OWNERS MANUAL.
Remove debris from slots.
Remove debris from cooling fins and air
passages.
Set gap between electrodes at 0.7 to
0.8 mm.
Remover any debris from slots in shroud,
blower housing, air passages.
For PLM4817: Install QC12YC or
RC12YC spark plug and cooling fins on
engine.
For PLM4818: Install QC12YC spark plug
and cooling fins on engine.
For PLM4819: Install XC92YC spark plug
and cooling fins on engine.
Tighten blade.
Balance blade.