12.3.4 Pump Diaphragm - Stihl MS 270 User Manual

12.3.4 Pump Diaphragm

1
Take out the screw (arrow).
Remove the end cover (1).
1 2
Carefully remove the gasket (1)
and pump diaphragm (2) from the
end cover or carburetor body.
Carefully separate the diaphragm
and gasket.
– Inspect diaphragm for damage
and wear, install a new gasket.
76
The diaphragm, inlet and outlet
valves are subjected to continuous
alternating stresses and the
material eventually shows signs of
fatigue, i.e. the diaphragm distorts
and swells and has to be replaced.
1
Inspect the fuel strainer (1) for
contamination and damage. If
necessary, use a needle to
remove it from the carburetor
body and clean or replace.
Install in the reverse sequence.
Place the diaphragm and gasket
on the carburetor body so that
their tabs (arrow) point towards
the elbow connector (1).
– Fit the end cover on the
carburetor body.
The pump diaphragm, gasket and
end cover are held in position by
pegs on the end cover.
– Fit screw and tighten down firmly
– see 3.5.
Reassemble all other parts in the
reverse sequence.
MS 270, MS 280
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