T01127en.fm
71
Maintenance work
8.14 Troubleshooting
Malfunction
System
Observation
Cause
Cutting blade
does not start
Clutch
Engine is run-
ning
Clutch is damaged.
Cutting blade
rotates when
engine is idling
Carburetor
Cutting blade is
running
Idle setting incorrect.
Clutch
Clutch is blocked.
V-belt
Belt has insufficient tension,
V-belt is worn.
Engine will not
start or is hard
to start
Ignition sys-
tem
There is an igni-
tion spark
Malfunction in the fuel sup-
ply, compression system,
mechanical fault.
No ignition
spark
STOP switch was actuated,
fault or short-circuit in the
cable, spark plug connector
or spark plug is defective.
Fuel supply
Fuel tank is full
Choke is in the wrong posi-
tion, carburetor is defective,
suction head is dirty, fuel line
is kinked or interrupted.
Compression
system
Inside the
machine
Cylinder base gasket is
defective, oil seals are dam-
aged or the piston ring is
damaged.
Outside of the
machine
The spark plug does not
make an airtight seal.
Mechanical
faults
Starter does not
engage
Spring in the starter is bro-
ken, broken parts within the
engine.
Problems with
warm start
Carburetor
Fuel in tank,
there is an igni-
tion spark
Carburetor setting is incor-
rect.
Engine starts,
but goes out
again immedi-
ately
Fuel supply
Fuel in the tank
Idle setting incorrect, suc-
tion head or carburetor is
dirty. Tank venting is defec-
tive, fuel supply interrupted,
cable is damaged, STOP
switch is damaged, decom-
pression valve.
Insufficient
power
This may
affect several
systems
Machine runs in
idle
Air cleaner is dirty, carbure-
tor setting is incorrect, muf-
fler is clogged, exhaust port
in the cylinder is clogged.
Belt has insufficient tension,
V-belt is worn.
