Stihl 020 T Service Manual page 49

• If the fuel strainer in the pump
side of the carburetor body is
dirty, use a scriber to pry it out
and then clean it.
Important: If the fuel strainer is
damaged, fit a new one.
In such a case the fuel pickup
body should also be inspected and
replaced if necessary - see 10.4.
• Take out the screws of the
metering chamber end cover and
lift away the cover.
STIHL 020 T
• Remove the metering diaphragm
and gasket from the carburetor
body or the cover.
• Carefully separate the
diaphragm and gasket.
• Inspect diaphragms and replace
if necessary.
Note: The diaphragms are the most
delicate parts of the carburetor. They
are subjected to continuous alternating
stresses and the material eventually
shows signs of fatigue, i.e. the
diaphragms distort and swell and have
to be replaced.
The inlet needle valve is located in a
recess in the metering diaphragm
chamber.
• Remove the round head screw (1).
• Remove the inlet control lever (2)
with spindle (3), helical spring (4)
and inlet needle (5).
• If there is an annular indentation
on the sealing cone of the inlet
needle, it will be necessary to
replace the inlet needle because it
will no longer seal properly. This
is indicated by constant flooding
of the carburetor even though the
needle is clean.
• Remove the carburetor adjusting
screws.
49