Stihl MS 440 - Fixed Jet; Pump Diaphragm

70 MS 440, MS 440 C
: Fit the inlet needle (1).
: Fit spring (2) in bore.
: Insert spindle (3) in the inlet
control lever (4).
– Engage clevis in annular groove
VA
176RA280
4
2
1
3
on head of the inlet needle.
– Press the inlet control lever down
and secure it with the screw.
Make sure the helical spring locates
on the control lever’s nipple.
– Check that inlet control lever
moves freely.
The upper face of the inlet control
lever must be flush with the top of
the carburetor body.
– Install the metering diaphragm –
b 12.3.1
– Remove the metering
diaphragm – b 12.3.1
: Use a suitable screwdriver to
unscrew the fixed jet (1).
The fixed jet must not be damaged
by the screwdriver during assembly
VA
176RA288
1
or disassembly!
Reassemble in the reverse
sequence.
: Take out the screw (arrow).
– Remove the end cover.
VA
176RA266
: Remove the gasket (1) and pump
diaphragm (2) from the end cover
or carburetor body.
VA
176RA267
2
1
: Carefully separate the diaphragm
and gasket.
– Inspect diaphragm for damage
and wear, install a new gasket.
VA
176RA268
12.3.3 Fixed Jet 12.3.4 Pump Diaphragm