Inlet Needle; Fixed Jet; Pump Diaphragm - Stihl 4180 Series Manual

6.2.5

Inlet Needle

1
– Remove the metering
diaphragm, b 6.2.4
: Loosen the collar screw (1).
1
: Carefully remove the inlet control
lever (1) with spindle.
Reassemble in the reverse
sequence.
– Engage clevis of inlet control
lever in groove on inlet needle.
– Helical spring must locate in inlet
control lever's recess.
Make sure the inlet needle and
spring are properly seated.
Series 4180 Powerhead
6.2.6

Fixed Jet

– Remove the metering
diaphragm, b 6.2.4
: Use a suitable screwdriver to
unscrew the fixed jet (1).
Reassemble in the reverse
sequence.
Take care not to damage the fixed
jet with the screwdriver during
assembly and installation.
6.2.7

Pump Diaphragm

2
1
1
– Remove the carburetor, b 6.2.2
: Take out the screws (1).
: Remove the end cover (2).
1
2
: Remove the spring (1) and spring
retainer (2) from the diaphragm.
1
23