Stihl MS 661 Manual page 5

Storing and disposing of fuels
Collect fuel in a clean container and
dispose of it properly in accordance
with local environmental
regulations.
Connectors in electrical wires
The insulating tube must be
centered on the connector and
completely cover it – there is
otherwise a risk of a short circuit.
The connector is properly
assembled when its overall length is
a = no more than 30 mm.
Positioning wires
Always use punch down tool
5910 890 4000 to press electrical
wires fully into their guides.
1.2 Safety Precautions
If the machine is started up in the
course of repairs or maintenance
work, observe all local and country-
specific safety regulations as well
as the safety precautions and
warnings in the instruction manual.
4
Fuel is extremely flammable and
can be explosive in certain
conditions.
Do not smoke or bring any fire,
flame or other source of heat near
the fuel. All work with fuel must be
performed outdoors only. Spilled
fuel must be wiped away
immediately.
Avoid direct skin contact with fuel
and avoid breathing in fuel vapor.
Always perform leakage test after
working on the fuel system and the
engine.
Exercise extreme caution while
carrying out maintenance and repair
work on the ignition system. The
high voltages which occur can
cause serious or fatal accidents.
The ignition is switched on again
automatically after the engine stops.
The engine can start at any time if
the rewind starter is operated.
Always wear suitable protective
gloves for operations in which
components are heated for
assembly or disassembly.
Improper handling may result in
burns or other serious injuries.
Always replace damaged parts.
Check disassembled parts for wear
or damage before re-installing –
replace as necessary.
Run the machine only with the
rewind starter and shroud mounted
in position – there is otherwise a risk
of injury from the flywheel and a risk
of engine damage due to
overheating.
Remove the spiked bumper
to reduce the risk of injury from
contact with the sharp tips.
The chapter on tightening torques
lists all machine components that
have to be tightened to a specific
torque or coated with threadlocking
adhesive. The specifications must
be maintained when tightening
down screws, nuts and other
fasteners in all the procedures
described in this service manual.
Fuel system – hose barb
connectors
Pull off or push on fuel hoses in line
with the connector, preferably by
hand, to ensure the tightness of the
fuel system.
Avoid damaging the hose barb
– do not use sharp-edged pliers,
screwdrivers, etc.
Do not cut open fuel hoses with a
knife or similar tool.
Do not re-use fuel hoses after
removal. Always install new hoses
– fuel hoses can be overstretched
during removal.
Install new fuel hoses either dry or
with the aid of STIHL press fluid
– coat the ends of hoses and the
connectors, b 16.
Other press fluids are not approved
and may result in damage to the fuel
hoses.
MS 661, MS 661 C-M