Stihl 4180 Series Service Manual

Series 4180 Powerhead28
Installing
N Fit a new gasket (6) and metering diaphragm (5) – the
small hole (arrow) in the gasket and metering
diaphragm (5) must be on the same side as the
adjusting screws.
N Fit bulb (3) in the annular groove (arrow) in the flange
(4).
N Fit the end cover (2).
N Line up the flange (4) so that both fuel connectors
(arrows) are opposite the adjusting screws.
N Fit two screws (1) to hold the gasket (6) and metering
diaphragm (5) in place.
N Fit the other screws (1).
N Tighten down the screws (1) firmly in a crosswise
pattern.
N Install the carburetor, @ 10.2
N Check operation:
11.6 Inlet Needle
Removing
N Remove the metering diaphragm (5).
N Use T8 screwdriver 5910 890 2310 to remove the
screw (11).
N Pull the inlet control lever (7) with spindle (8) out of
the groove in the inlet needle (10) – the spring (9)
under the inlet control lever (7) may pop out.
N Take out the spring (9), inspect it and renew if
necessary.
N Pull out the inlet needle (10), inspect it and renew if
necessary.
If there is an annular indentation (arrow) on the sealing
cone of the inlet needle (10), fit a new inlet needle.
Installing
N Fit the inlet needle (10), pointed end first, in the
carburetor.
N Fit the spring (9).
N Position the inlet control lever (7) with spindle (8) on
the spring (9) first, then slide the inlet control lever’s
clevis into the annular groove in the inlet needle (10).
The spring (9) must locate in the inlet control lever’s (7)
recess.
N Press the inlet control lever (7) down and secure it
with the screw (11).
N Check that the inlet control lever (7) moves freely.
N Install the metering diaphragm (5).
11.7 Pump Diaphragm
Removing
N Remove the carburetor, @ 10.2
N Take out the screws (33).
N Remove the end cover (32) – the spring (34) and
washer (35) may drop out.
N Carefully remove the gasket (31) and pump
diaphragm (30) from the pegs on the end cover (32).
N Carefully separate the pump diaphragm (30) and
gasket (31).
N Examine the pump diaphragm (30) for damage and
wear, replace if necessary. If the pump diaphragm
(30) is distorted, fit a new one.
N Clean the strainer (29) – if necessary, use a scriber to
remove the strainer from the carburetor body.
N Replace the gasket (31).
Installing
N Push the strainer (29) into its seat in the carburetor
body. Raised side of strainer (29) faces inwards.
N Fit the spring (35) and washer (35) on the end cover
(32).
N Place the gasket (31) on the end cover (32) so that
the pegs (arrows) hold it in position.
N Place the pump diaphragm (30) on the gasket (31)
and over the pegs (arrows).
5
6
2
3
4
1
0000-GXX-2421-A0
11
1
78
10 10
0000-GXX-2422-A0
35 31
32
33
32
30
34
0000-GXX-2424-A0

Stihl 4180 Series Specifications

General

Brand	Stihl
Model	4180 Series
Category	Engine
Language	English