Pump Diaphragm - Stihl MS 441 Manual

14.4.5 Pump diaphragm

– Remove carburetor, b 14.3.
: Take out screw (arrow).
: Carefully remove end cover (1).
: Carefully remove gasket with
pump diaphragm from the end
cover.
104
1
2
: Carefully separate pump
diaphragm (1) and gasket (2).
The diaphragm material is
subjected to continuous alternating
stresses and eventually shows
signs of fatigue, i.e. the diaphragm
distorts and swells and has to be
replaced.
– Examine pump diaphragm for
signs of damage and wear,
replace gasket.
– Examine fuel strainer for
1
contamination and damage,
clean or replace if necessary.
1
: Pull fuel strainer (1) with needle
out of the carburetor housing and
clean it, replace if necessary.
– Reassemble in the reverse
sequence.
2
: Fit gasket (1) so that tab (2) is
opposite lug (3) and the gasket is
secured by the pegs (arrows).
2
: Place diaphragm (1) on the
gasket so that tab (2) is opposite
lug (3) and the diaphragm is
secured by the pegs (arrows).
1
: Fit end cover so that the lug
(arrow) points towards the
adjusting screws.
MS 441, MS 441 C
1 3
1
3