Pump Diaphragm - Stihl MS 311 Manual

: If there is an annular indentation
(arrow) on the sealing cone of the
inlet needle, fit a new inlet
needle.
Installing
1
: Fit the inlet needle (1).
: Fit the spring (2) in the bore.
74
1
: 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.
2
– Install the metering diaphragm,
b 12.6.1

12.6.3 Pump Diaphragm

2 3
2
– Troubleshooting, b 3.6
– Remove the carburetor, b 12.5
: Take out the screw (1).
– Remove the end cover (2).
If the gasket and pump diaphragm
are stuck to the carburetor, remove
them very carefully.
: Carefully remove the pump
1
diaphragm with gasket.
MS 311, MS 391