Pump Diaphragm - Stihl MS 261 User Manual

1 2 3
: Position the inlet control lever (3)
with spindle (2) on the
spring (arrow) first, then slide the
inlet control lever's clevis into the
groove in the inlet needle (1).
Make sure the spring locates on the
control lever's nipple.
– Press the inlet control lever down
and secure it with the screw.
– Check that the inlet control lever
moves freely.
– Install the metering diaphragm,
b 12.6.1

12.6.3 Pump Diaphragm

– Troubleshooting, b 3.6
– Remove the carburetor, b 12.5
1 2
: Take out the screw (1).
: Remove the end cover (2).
114
Models with handle and
carburetor heating
1
2
: Take out the screw (1).
: Remove the thermostatic
switch (2).
: Remove the end cover (3).
If the gasket and pump diaphragm
are stuck to the carburetor, remove
them very carefully.
: Carefully remove the pump
diaphragm with gasket.
1
3
2
: Carefully separate the 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.
– Check the pump diaphragm for
signs of damage and wear. Install
a new gasket.
– Check fuel strainer for
contamination and damage.
Clean or replace if necessary.
1
: Use a needle to remove the fuel
strainer (1) from the carburetor
body. Clean or replace the fuel
strainer.
– Reassemble in the reverse
sequence.
MS 261, MS 261 C