Mountfield 550 SP TRI-CUT, Owner'S Manual, Page: 11 / 16

11
ENGLISH
GB
SPARK PLUG
Never remove the spark plug or spark
plug cable when checking to see if there
is a spark. Always use an approved test
instrument.
Clean the spark plug regularly (every 50 hours of
run time or once a season). Use a wire brush for
cleaning.
Change the spark plug if the electrodes are exces-
sively burnt or if the plug is damaged. The engine
manufacturers recommendations are as follows:
(fig. 15):
Champion J19LM (RJ19LM), spark gap 0.75 mm.
ADJUSTING CLUTCH CABLE
If the drive does not engage when the power drive
lever is pressed against the handle, or if the lawn-
mower feels cumbersome or slow, this may be be-
cause the clutch in the transmission is slipping. To
rectify this situation, adjust the clutch cable as fol-
lows:
1. When the clutch loop is released, it should be
possible to push the mower without any resist-
ance. If this is not the case, screw in the nipple
T until the mower can be pushed (fig. 17).
2. When the clutch loop is
pressed in approx. 2 cm (posi-
tion 1), there should be some
resistance when pushing the
lawnmower. With the clutch
loop fully pressed in (position
2) it should not be possible to
push the mower. Unscrew the
nipple
T until this position is
achieved.
CHANGING BLADES
Wear protective gloves when changing
blade(s) to avoid cutting yourself.
Check the blade system regularly. Check
particularly the curved area behind the
blade edge for traces of wear. If the blade
shows traces of damage it should be re-
placed. A worn blade creates imbalance
and can damage the mower.
Always check the blades after a collision. First dis-
connect the spark plug cable. If the blade system
has been damaged, defective parts should be re-
placed. Always use genuine spare parts. Replace-
ment blade pack reference MS1186 is available
from all B&Q stores and specialist garden machin-
ery dealers.
To replace the blade, slacken the screw (fig. 18).
Fit the new blade so that the stamped logo is turned
up facing the blade holder (not facing the grass).
Reinstall the washer and screw. Tighten the screw
properly. Tightening torque 40 Nm.
When replacing the blade, the blade screw should
also be replaced.
The guarantee does not cover damage to the blade,
blade holder or engine caused by running into ob-
stacles.
When replacing the blade, the blade holder and
blade screw, always use genuine spare parts. Non-
genuine spare parts can entail a risk of injury or
damage, even if they fit the machine.
SHARPENING THE BLADES
Sharpening of the blades must be done by wet
method grinding, using a whetstone or a grind-
stone. It is important to keep the same angle as the
original edge.
For safety reasons, the blades should not be sharp-
ened on an emery wheel. A very high temperature
could cause the blades to become brittle.
Once the blade has been sharpened, it
must then be balanced to avoid vibra-
tion damage. Refer tp your local dealer.
STORAGE
WINTER STORAGE
Empty the fuel tank. Start the engine and let it
run until it stops. The same petrol must not re-
main in the tank for more than one month.
Tip up the mower and unscrew the spark plug.
Pour a tablespoon of engine oil into the spark plug
hole. Pull out the starter handle slowly so that the
oil is distributed in the cylinder. Screw in the spark
plug.
Thoroughly clean the mower and store it indoors in
a dry place.