Sachs SA 280A - Page 44

ENGINE WITH BOSCH SOLENOID-CONTROLLED
STARTER
(Type DO)
Fi g. 61
To remove starter, unscrew 2 o
nuts (3) M 8 with spring washers
and two screws (1) M 8 x 20 with
washers .
Fig. 61
The pinion of the solenoid-co nt ro ll ed starter (Fig. 61) slid es on a coar se thread on the
a rmature shaft and is first pr esse d up against the gear rim by means of a shift lever
until it engages with it. The lever is electro-magnetically operated. Shortly after
engagement of the pinion, the switch mounted on the starter automatically closes
- on mechanically operated starters by means of the engaging lever - the armature
revolves and the pinion screws it self furth er forward on the coarse thread until it is
fully engaged. Even if looth on tooth engagem ent occ urs, the switch will clos e, as
t
he spring is sp ring- conn e ct ed to the g uide ring and the l ever is therefore no t
hindered in its mov e ment; when starti ng, the arma tur e turns the pinion until it can
engage. As soo n as the pinion runs up against its co unt e rpart, firm contact is e stab -
lish
ed between it and the armatur e, and the eng in e is be ing started.
If, aft er s tarting, the e ngine be gins to overtake the s ta rt er, the pinion is uncoup led
f
rom the armature s haft by an overrunn ing roller clutch, but remains engaged with
the
gear rim until t he eng ag ing lev er is returned to its initial position by a return
s pnng .
To e
nabl e the sta rter to come to r est as soo n as possibl e after bei ng switch ed off, an d
to en able a new s ta rt to be made shortly aft e rwards, an armat ure b rake is install ed
on the commutator bearing of the s ta rter .
42
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