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MTD H12 Get To Know page 23

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Installing the single line
To install the Split-Line™, please read Point 8
6. Take approx. 7.3 metres of new trim line and fold in half.
Feed each end of the line through each of the two holes
in the coil (Fig. 28). Pull the line through the coil until
the loop is as small as possible.
7. Wind the lines onto the coil in tight, even layers (Fig. 29).
Wind the line in the direction indicated on the coil.
Place your index finger between the two lines to prevent
them from overlapping. Do not overlap the ends
of the line. In addition to step 11.
Split-Line™
8. Take approx. 3.65 metres of new trim line.
Feed one end of the line through one of the two holes
in the coil (Fig. 30). Pull the line through the coil until there
is only approx. 10 cm left.
9. Feed the end of the line into the open hole in the coil
and pull the line tight until the loop is as small as possible
(Fig. 30).
10. Before winding the line, divide a length of approx. 15 cm.
11. Wind the line in tight, even layers in the direction
indicated on the coil.
Note: If the line is not wound in the direction indicated
on the coil, the cutting attachment will not run correctly.
12. Feed the ends of the line into the two retaining slots
(Fig. 31).
13. Feed the ends of the line through the eyes in the coil
housing and place the coil with spring in the coil housing
(Fig. 24) Press the coil and coil housing together.
Hold coil and coil housing and simultaneously grip
the ends of the line and pull firmly to detach the line
from the retaining slots in the coil.
Note: The spring must be installed on the coil before
the cutting attachment is reinstalled.
14. Hold the spool in place and install the bump head
by rotating it anti-clockwise. Tighten firmly.
Installing a coil with prewound line
1. Hold the outer spool with one hand and unscrew
the bump head clockwise with the other hand (Fig. 24).
Check that the bolt inside the bump knob can move
freely. Replace a damaged bump knob.
2. Remove the old inner coil from the outer coil (Fig. 24).
3. Take the spring out of the inner coil (Fig. 24).
4. Clean the inner coil, the spring, the shaft and the inner
surface of the outer coil with a clean cloth.
5. Insert the spring into the new inner coil.
Note: The spring must be installed on the inner coil before
the line coil is reinstalled.
6. Feed the ends of the line into the eyes in the outer
coil (Fig. 32).
7. Insert the new inner coil into the outer coil (Fig. 32).
Then press to connect both coils. Hold the inner and
outer coils, grip the ends of the line and pull firmly
to release the line from both retaining slots in the coil.
8. Hold the inner spool in place and firmly tighten the bump
head again by rotating it anti-clockwise.
Maintenance and repair
Cleaning the air filter
After ten operating hours clean and lubricate the air filter.
It is important to service these components properly.
If the air filter is not cleaned and serviced, any warranty
will be deemed null and void.
1. Open air filter cover: Press retention plate (3) and open
2. Remove the air filter (2) (Fig. 33).
3. Wash the filter with detergent and water (Fig. 34).
4. Use adequately clean oil (SAE 30) to lubricate the filter
5. Press on the filter to distribute the oil and remove excess
6. Install filter.
7. Close air filter cover, ensuring that it locks in place.
Note: If the unit is used without the air filter, the warranty
Adjust carburettor
The idle speed can be set with the screw (Fig. 37).
Have this setting carried out by a specialist company only.
Check/replace spark plug
Use a Champion RDJ7J spark plug (or an equivalent
spark plug). The correct electrode gap is 0,63 mm.
Every 50 operating hours take out the spark plug and check
its condition.
1. Stop the engine and leave it to cool down.
2. Remove spark-plug terminal.
3. Remove dirt from around the spark plug.
4. Unscrew spark plug to the left with a spark plug wrench.
5. Check/set the electrode gap 0,63 mm (Fig. 38).
Note: Replace a damaged, sooted or dirty spark plug.
6. Screw in spark plug and tighten to a torque
Cleaning
Use a small brush for cleaning the outside of the unit.
Do not use abrasive detergents. Household cleaners which
contain aromatic oils such as pine oil or lemon as well as
solvents such as kerosene may damage the plastic housing
and handle. Wipe damp areas with a soft cloth.
Storage
cover (1) (Fig. 33).
Flush out the filter thoroughly, leave to drip and
dry completely.
easily (Fig. 35).
oil (Fig. 36).
will be voided.
of 12.3–13.5 Nm. Do not tighten too tightly.
Never store the unit with fuel in the tank or where fumes
are within reach of a spark or naked flame.
Before storing the unit, leave the engine to cool down.
Store the unit locked away or high up to prevent
unauthorised use and damage. Keep the unit away from
children.
23

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