Hilti DSH 700 Mode D'emploi Original page 47

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Trouble or fault
High vibration, disc wanders
off the cutting line.
The saw doesn't start or is
difficult to start.
Low engine power / poor
cutting performance
Possible cause
The centering bushing is fitted in-
correctly.
The fuel tank is empty (no fuel in
the carburetor).
Air filter clogged with dirt or dust.
DSH 700
DSH 900
The engine is flooded (spark plug
wet).
DSH 700-X
DSH 900-X
The engine is flooded (spark plug
wet).
Wrong fuel mixture.
Air in the fuel line (no fuel reaching
the carburetor).
The fuel filter is dirty or blocked (no
fuel or too little fuel reaching the
carburetor).
No ignition spark visible or spark is
too weak (seen when spark plug is
removed).
Engine compression is too low.
The ambient temperature is too
low.
The spark arrestor or exhaust exit
is clogged.
The decompression valve is stiff to
operate.
Air filter clogged with dirt or dust.
Action to be taken
▶ Check that the mounting bore
of the cutting disc to be
fitted corresponds with the
centering collar of the cutting
disc mounting flange.
▶ Fill the fuel tank. → page 30
▶ Change the air filter.
▶ Remove the spark plug, dry the
plug and allow the cylinder to
dry out.
▶ Disengage the choke lever and
repeat the starting procedure
several times.
▶ Remove the spark plug, dry the
plug and allow the cylinder to
dry out.
▶ Empty the fuel tank and flush
out the tank and fuel supply line.
▶ Fill the fuel tank with the correct
fuel.
▶ Remove the air from the fuel
line by operating the fuel pump
several times.
▶ Clean the fuel tank and change
the fuel filter.
▶ Clean the spark plug to remove
carbon deposits.
▶ Check the spark plug electrode
gap and set it correctly.
▶ Change the spark plug.
▶ Check the ignition coil, cable,
plug connections and switch
and change the defective part if
necessary.
▶ Check the engine compression
and, if necessary, replace worn
parts (piston rings, piston,
cylinder, etc.).
▶ Allow the saw to warm up to
room temperature and repeat
the starting procedure.
▶ Clean the spark arrestor or
exhaust exit.
▶ Make sure that the valve
operates freely.
▶ Change the air filter.
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