Accelerator Pump - Stihl BR 500 Service Manual

– Carefully separate the diaphragm
and gasket.
– Inspect the diaphragm for
damage and wear, fit anew
gasket.
As a result of the alternating
stresses, the diaphragm material
and the inlet and outlet valves
eventually show signs of fatigue, i.e.
the diaphragm distorts and swells
and has to be replaced.
1
: Examine the fuel strainer (1) for
contamination and damage. If
necessary, use a needle to pull it
out of the carburetor body and
clean or replace.
Install in the reverse sequence.
BR 500, BR 550, BR 600
1 2
: Fit the diaphragm (1) and
gasket (2) on the carburetor body
so that contours (arrow) match.
– Place the end cover on the
carburetor.
The pump diaphragm and gasket
are held in position by cast pegs on
the end cover.
– Fit the screw and tighten it down
firmly, b 3.4
Install all other parts in the reverse
sequence.
6.3.4

Accelerator Pump

1
– Remove the carburetor, b 6.2.2
Wear safety glasses.
: Take out the screw (1).
: Remove the throttle lever (2).
2
: Carefully remove the spring (1).
: Remove the sleeve (2).
1
2
Note correct installed position of
throttle shutter.
: Take out the screw (1).
: Remove the throttle shutter (2).
2
1
23