Adjustment; Valve - Stihl MS 441 Manual

13.3.2 Adjustment

The relevant settings are described
in the instruction manual.
In the case of oil pumps with
increased delivery rate, note that
the oil tank is empty before the fuel
tank and the saw chain may
therefore run dry when range "a" is
reached.
For setting range "a", the fuel tank
should therefore only be half-filled
or the oil tank refilled when the fuel
tank is half-empty.
1
The oil pump with increased
delivery rate can be identified via
the groove (1) or all-round groove
(arrow) in the pump piston.
94
13.4

Valve

A valve is installed in the tank wall to
keep internal tank pressure equal to
atmospheric pressure. The valve
must be replaced if faulty.
– Remove chain sprocket cover,
bar and chain, b 5.
– Unscrew oil tank cap and drain
oil tank.
Collect chain oil in a clean container
and dispose of it in accordance with
environmental regulations.
: Carefully drive valve out of the
housing from the outside, into the
tank, with a drift dia. 6 mm.
1
: Remove old valve (1) from oil
tank.
Ensure that valve is correctly
positioned.
: Insert valve in hole (arrow) of
engine housing.
: Carefully drive valve into hole in
engine housing from the outside
with a drift dia. 6 mm, noting the
insertion depth.
: Drive new valve into hole
a = approx. 2 – 3 mm.
– Reassemble all other parts in the
reverse sequence.
MS 441, MS 441 C