Sachs SA 280A Repair Instructions

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Initial adjustment
Jet adju s tment should fi rst be done w hen the engine is col d. Proc eed as fo ll ows: Clo se
both jet s and open the adjus ti ng screw of the main j et and the adjust ing screw of the
id li ng jet again to the values given in the ca rburettor chart (see te chnic al data) . Turn
the idli ng adjust ment screw so far back that it is no lon ge r in contact with t he butterfly
v alve lev er ; then turn the screw in again about one whole turn, so that the butterfly
valve is slightly open .
Now s ta rt the eng ine and all ow it to warm up (open the choke as so on a s the engine
star ts up ).
Fino I adjustment: see secti on "Test-running the engine" .
Maintenance of the carburettor
At c ert ain intervals every ca r bu r etto r must be disassembled, cleaned and overhauled.
A ll exterior dirt sho uld be cleaned off with ga · soline before disassembl y. The holes ,
ducts, passage s and jets must not be cl ea ned with hard objects (e. g. wire or dr il l) ,
but s
hould only be rinsed with gasoline and cl eane d with compre ssed air (remov e
diap hra gms b ef or e blow ing thro ugh). Before asse mbly , check that a ll carbur ettor
components (espec i ally j et sea ts and diaphragms) are in proper working order.
Checking and cleaning the fuel filter in good t ime he lps to achieve satisfactory func-
tioning of the carburettor and longer engi ne service life.
Special maintenance instructions
1. If pump failu re occurs , always check (bef or e re moving the pump diaphragm) the
impulse pipelin e for l eakage and blockage.
2. When fitting the inlet co ntr ol l ever and the compression spring (see ill ustration) ,
take ca re t hat both ends of the spring are b edded in the spring seats.
3. The compres sion s pr ing mu st not be st re tc hed , as the spr ing pr essure is a ccurat e ly
adjusted to the carburettor.
4. The inlet control lever is cor -
rectly insert ed whe n it is at the
sa me level as th e b otto m of """""
the diap hragm ch amber (see
arrows on illus tration).
5. Th e inlet needl e should close
just when the inlet con trol le-
ver is flush with t he bottom of
the chamb er. If not, the lever
s hould be adjusted by bend-
ing it a little (on the inlet
needle si de).
6. W
hen assemb ling the carbu-
rettor, make sure th at main
diaphragm, gasket and cast -
ing
of the h ousi ng are care -
fully in
serted into the ea st- on
c en t ering pins; simila rl y, the
gasket, fuel diaphragm and F ig. 49
fuel pump body are adjus ted
by means of the sa me ki nd of
cen te ring pins.
The gaskets at both dia-
phragms are in eac h ca se po -
si
tion ed on that side of the
diaphragm which faces the
carburettor hou sing.
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Sachs SA 280A Specifications

General

Brand	Sachs
Model	SA 280A
Category	Engine
Language	English