Pump Diaphragm - Stihl MS 231 Manual

1
3
2
: Take out the screw (1).
: Remove the inlet control lever (2)
with
spindle (3) out of the inlet
needle's groove.
The small spring under the inlet
control lever may pop out.
1
: Remove the inlet needle (1).
: Remove the spring (2). Inspect
and replace if necessary.
: If there is an annular
indentation (arrow) on the
sealing cone of the inlet needle,
fit a new inlet needle.
MS 231, MS 231 C, MS 251, MS 251 C
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Installing
1
: Fit the inlet needle (1).
: Fit the spring (2) in the bore.
1
2
: 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
2
2
: Take out the screw (1).
2 3
: Remove the end cover (2).
If the gasket and pump diaphragm
are stuck to the carburetor, remove
them very carefully.
1
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