Hilti DSH 700, Operating Instructions Manual

Page: 24 / 285

10. Pull the starter cord out as far as it will go and
check to ensure that the spool can be turned
by hand at least a further ½ turn in a clock-
wise direction. If this is not possible, spring
tension must be reduced by one revolution in a
counterclockwise direction.
11. Fit the starter assembly to the machine and press
it down gently.
Pull the starter cord slightly until the coupling
engages and the starter assembly is fully seated.
12. Secure the starter assembly with the three re-
taining screws.
8.4 Checking and replacing the fuel filter
13
NOTE
Check the condition of the fuel filter regularly.
NOTE
When refueling the machine, take care to ensure that
no dirt or foreign matter finds its way into the fuel
tank.
1. Remove the cap from the fuel tank.
2. Pull the fuel filter out of the fuel tank.
3. Check the condition of the fuel filter.
The filter must be replaced if badly soiled.
4. Push the fuel filter back into the fuel tank.
5. Close the cap on the fuel tank.
8.5 Cleaning the spark plug / setting the spark
plug gap / replacing the spark plug
14
CAUTION
The spark plug and parts of the motor may be hot
immediately after the machine has been running.
To
avoid burning your hands, wear suitable protective
gloves or allow the machine to cool down before
touching its parts.
Use only spark plugs of the type NGK ತ CMR7A-5.
1. Use a gentle twisting motion to pull the cable
connector off the spark plug.
2. Use the spark plug wrench to unscrew and re-
move the spark plug from the cylinder.
3. If necessary, clean the spark plug electrode with
a soft wire brush.
4. Check the spark plug gap (0.5 mm) with the aid
of a feeler gauge and reset it to the correct gap if
necessary.
5. Fit the ignition cable connector to the spark plug
and hold the threaded section of the spark plug
against the cylinder.
6. Move the start / stop switch to the “start” posi-
tion.
7. CAUTION Avoid touching the spark plug elec-
trode.
Pull the starter cord (press the decompression
valve first).
An ignition spark must now be clearly visible.
8. Use the spark plug wrench to screw the spark
plug into the cylinder (12 Nm).
9. Fit the ignition cable connector to the spark plug.
8.6 Retensioning the drive belt
15
CAUTION
A slack drive belt can damage the machine.
Reten-
sion the drive belt if it slips when a load is applied to
the cutting disc.
NOTE
The drive belt must be replaced as soon as the
wear mark on the saw arm becomes visible after
retensioning.
This machine is equipped with a semi-automatic,
spring-assisted drive belt tensioning system.
1.
Slacken the three clamping nuts on the forward
section of the saw arm approx. one complete
turn.
2. After releasing the nuts, the drive belt is ten-
sioned automatically by spring pressure.
3. Retighten the three clamping nuts securely (18
Nm).
8.7 Changing the drive belt
16
NOTE
After doing this, check that the cutting disc can be
turned easily by hand and that all screws have been
tightened securely.
1. Slacken the three clamping nuts on the forward
section of the saw arm approx. one complete
turn.
2. Release the tension on the drive belt by turning
the belt tensioning cam counterclockwise care-
fully as far as it will go (until resistance is felt,
i.e. approx. ¼ of a turn).
3. Remove the upper and lower clamping nuts and
the two securing screws from the forward section
of the saw arm and remove the drive belt cover.
4. Release the four securing screws on the rear
drive belt cover and remove the cover.
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Printed: 07.07.2013 | Doc-Nr: PUB / 5069783 / 000 / 00