Hilti DSH 700 Manual De Instrucciones página 42

1. Use a gentle twisting motion to pull the cable con-
nector off the spark plug.
2. Use the spark plug wrench to unscrew and remove
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" position.
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. Retension
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 tensioned
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 carefully 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.
5. Remove the defective drive belt. Place the new drive
belt carefully over the two drive pulleys.
6. Tension the drive belt by turning the belt tensioning
cam clockwise carefully as far as it will go (until
resistance is felt, i.e. approx. ¼ of a turn).
7. Fit the rear drive belt cover and secure it with the
four screws.
8. Secure the forward drive belt cover with the two
clamping nuts and two securing screws.
9. Tighten the three clamping nuts securely (18 Nm).
8.8 Adjusting the carburetor 17
CAUTION
Tampering with the carburetor settings may cause
damage to the motor.
The carburetor of this machine (jets H and L) has been
factory set for optimum performance and sealed to pre-
vent tampering. The idling speed of the machine (jet T)
may be adjusted by the user. All other adjustments must
be carried out at a Hilti service center.
NOTE
Use a suitable flat screwdriver (tip width 4 mm/ ⁵/₃₂ ")
and do not force the adjusting screw beyond its intended
adjustment range.
1. Clean the air filter.
2. Allow the machine to run until it reaches its normal
operating temperature.
3. Adjust the idling speed jet (T) so that the motor runs
smoothly when idling but the cutting disc does not
begin to rotate.
8.9 Cleaning
Careful cleaning of the machine is one of the main pre-
requisites for trouble-free, reliable operation.
Heavy dirt and dust deposits on the motor and in the
cooling openings may lead to overheating.
Don't permit foreign objects to enter the interior of the
machine.
Don't use a high pressure jet system or running water for
cleaning.
Don't use cleaning agents which contain silicone.
Clean the exterior of the machine at regular intervals with
a slightly damp cloth or a dry brush.
Check that all grips are clean, dry and free from oil and
grease.
8.10 Maintenance
Check all external parts of the machine and the ac-
cessories for damage at regular intervals and check that
all controls operate faultlessly. Don't operate the machine
if parts are damaged or when the controls do not function
faultlessly. If necessary, the machine should be repaired
by Hilti Service.
en
35