Troubleshooting - LawnMaster 400 B 2.4 Owner's Manual

The engine does not start, runs
erratically or experiences power loss
POSSIBLE CAUSE
• Throttle not in choke/
start position.
• Fuel tank empty or fuel
shut off valve closed.
• Air filter element is
dirty.
• Spark plug loose.
• Spark plug cable
disconnected.
• Defective spark plug.
• Spark plug gap
incorrect.
• Carburettor is flooded
with fuel.
• Dirt, water or stale fuel
in the tank.
• Vent hole in the filler
cap is blocked.
The engine skips at high speed
POSSIBLE CAUSE
• Spark plug gap too
small.
The engine idles poorly
POSSIBLE CAUSE
• Blocked engine cooling
fins and air passages.
• Air filter element is
dirty.
The engine overheats
POSSIBLE CAUSE
• Cooling airflow
restricted.
• Incorrect spark plug
fitted.
• Low engine oil leve.l
Excessive vibration and/or noise
POSSIBLE CAUSE
• Worn or damaged
bearings.
• Worn or damaged drive
chains and/or sprockets.
• Worn or damaged
cutting reel or bottom
blade.

TroubleShooting

REMEDY
• Move throttle to
choke/start position.
• Fill tank with
recommended fuel
grade and open fuel
shut-off valve.
• Service or replace air
filter.
• Tighten spark plug.
• Re-fit cable to spark
plug.
• Replace damaged
spark plug.
• Replace damaged
spark plug/refer to
engine manual.
• Move throttle to STOP
position, pull the
starter cord 5-6 times,
move the throttle to
RUN and start engine.
• Drain and clean fuel
tank. Refill with clean,
fresh fuel before
starting.
• Clean or replace the
filler cap.
REMEDY
• Refer to Engine
Manual.
REMEDY
• Remove debris from
around the engine.
• Service or replace the
air filter.
REMEDY
• Remove debris from
around the engine.
• Refer to the Engine
Manual.
• Check oil level and top
up if necessary.
REMEDY
• Remove and inspect
suspect bearings, replace
if necessary.
• Remove and inspect
suspect chains/sprockets,
replace if necessary.
• Inspect cutting reel
& bottom blade for
excessive wear/damage.
Cutting edges will
require re-grinding or
replacement.
Oil leaks from muffler or air filter
POSSIBLE CAUSE
• Worn or damaged
flexible coupling.
• Engine oil sump
overfilled.
• Mower tipped or
handled incorrectly.
If fault persists consult your authorised Twin-Drive
service agent.
10
REMEDY
• Inspect and replace
worn spider if
necessary.
• Check oil level and
drain excessive oil.
• Check oil level, air
filter and spark
plug and correct as
necessary.