Troubleshooting - ST. SpA MJ 66 Séries Manuel D'utilisation

IMPORTANT A blown fuse must always be re-
placed by one of the same type and ampere rating,
and never with one of another rating.
If you cannot find out why the fuse has blown,
consult a Licensed Service Centre.
6.3.5 Removing, replacing and
reassembling of cutting means
WARNING! Always wear strong protec-
tive gloves to handle the cutting means.

7. TROUBLESHOOTING

PROBLEM
1. W ith the key on «START» the
starter motor does not run.
2. W ith the key on «START» the
starter motor runs but the engine
does not start
3. The engine stops
4. S tarting is difficult or the engine
runs erratically
5. W eak engine performance
during cutting
6. T he engine switches off when
the cutting device is engaged
bent cutting means; never attempt to repair
them! ALWAYS USE ORIGINAL CUTTING
MEANS!
Only cutting means bearing the code indicated in
the table on page ii must be used on this machine.
Given product evolution, the above mentioned
cutting means may be replaced in time with oth-
ers having similar interchangeable and operating
safety features.
LIKELY CAUSE
Electronic circuit board blocked
due to:
– flat battery
– fuse blown
– bad earthing to the engine or the
frame
– earth connections of the
microswitches disconnected
– badly earthed starter motor
– starting conditions have not
been met
– faulty fuel supply
– faulty ignition
Electronic circuit board blocked
due to:
– earth connections of the
microswitches disconnected
– flat battery
– b adly connected battery (poor
contact)
– engine badly earthed
– fault in carburetion
– f orward speed too high in relation
to cutting height
– t he movement of the lever used
to engage the cutting means is
too brusque
– y ou are not ready to engage the
cutting means
EN - 16
WARNING! Always replace damaged or
SOLUTION
Turn the ignition key to «STOP»
position and look for the cause of
the problem:
– recharge the battery (see 6.2.3)
– replace the fuse (10 A) (see 6.3.4)
– c heck connections of black earth
leads
– check connections
– check earth connections
– c heck that the conditions
allowing the start are met
(see 5.2.a)
– c heck the level in the tank
(see 5.3.3)
– check the fuel filter
– c heck that spark plug cap is
securely fitted
– c heck that the electrodes are
clean and have the correct gap
Turn the ignition key to «STOP»
position and look for the cause of
the problem:
– check connections
– recharge the battery (see 6.2.3)
– check connections (see 3.5)
– check engine earth connection
– clean or replace the air filter
– flush out the float chamber
– e mpty the fuel tank and refill with
fresh fuel
– c heck and replace the fuel filter if
necessary
– r educe the forward speed and/or
raise the cutting height (see 4.4)
– do it more slowly
– c heck that the safety
requirements are met (see 5.2.b)