Troubleshooting - Viking MB 248 T Instruction Manual

18. Troubleshooting

If necessary, contact a specialist
dealer; VIKING recommends VIKING
specialist dealers.
@ See engine instruction manual.
Fault:
Engine will not start
Possible cause:
– Motorstop lever not pressed.
– No fuel in tank; fuel line blocked.
– Inferior, dirty or old fuel in tank.
– Air filter dirty.
– Spark plug socket detached from spark
plug; ignition lead not properly fastened
to socket.
– Spark plug dirty or damaged; incorrect
electrode gap.
– Primer not pressed.
Remedy:
– Press motorstop lever to handlebar and
hold. ( 8.1)
– Top up fuel; clean fuel line.
– Always use fresh, good quality fuel,
normal unleaded petrol; clean
carburettor.
– Clean air filter.
– Connect spark plug socket; check
connection between ignition lead and
socket.
– Clean or replace spark plug; adjust
electrode gap.
– Press primer three times before
starting. ( 10.1)
0478 111 9820 B - EN
Fault:
Starting problems or deteriorating engine
power.
Possible cause:
– Lawn mower housing blocked.
– Mowing at an excessively low cutting
height or fast pushing speed.
– Water in fuel tank and carburettor;
carburettor blocked.
– Fuel tank contaminated.
– Air filter dirty.
– Spark plug dirty.
Remedy:
– Clean lawn mower housing (detach
spark plug socket!). ( 11.2)
– Set lower cutting height/reduce pushing
speed. ( 7.7)
– Empty fuel tank, clean fuel line and
carburettor.
– Clean fuel tank.
– Clean air filter.
– Clean spark plug.
Fault:
Engine overheating.
Possible cause:
– Oil level in engine too low.
– Cooling ribs dirty.
Remedy:
– Change engine oil. ( 7.8)
– Clean cooling ribs. ( 11.2)
Fault:
Excessive vibration during operation.
Possible cause:
– Cutting unit defective.
– Engine mounting loose.
Remedy:
– Check mowing blade, blade shaft and
blade fastening (blade fastening screw
and retaining washer), and repair if
necessary.
– Tighten engine mounting bolts.
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