Gravely 424 - Page 19

heceutions
l.
Battery
polarity
must
be corect. Negative
gmund
systems are
used.
2. Prevent
alterrator
leads
(AC)
from
touching
or
shorting.
This
could
permanently
damage the stator.
3. Disaonnect
leads
at rectiffer-regulator
before
electric
welding is done on
equipment.
COMPACT
SIARTING
MOTOR
The compact
starting
motors
used with
magneto-alternator
(ignition
and
battery charging)
systems,
use
Bendix
type
&ives
to engage
and disengage from
the engine.
OPERATION:
When the starting
circuit
is closed
and
the
armature starts
to rotate, the
Bendix
drive
pinion
moves
laterally
on a splined
sleeve into mesh
with the flywheel
ring
gear.
When the
pinion
butts against
a
stop
washer
at the end of
the
armature
shaft, the
pinion rotates
along
with
the armature to erank
&e
en$ne.
The alm-
ature
and
pinion
remain
in
positive
engagement
until
the
engine
ffres and
attains
the speed where the
flywheel
begins
overriding
the armature.
At th*
instant, the
greater
momentum
of
the
flywheel throws &e
pinion
out
of
mesh
and back
into the
retracted
or disengaged
position. After
the
starting circuit
is opened aad as
the armature
coasts
to a stop, a
small
spring
holds
the
pinion
in
the retracted
position.
P3ECAUTIONS:
In the event
of a'false start",
that
is,
if the
engine
gets
up sufreient
speed to disengage
the
starter
but fails
to csntinue
running
the engine
must be
allowed to come
to a
complete
halt before
a restart
at'
tempt
is made.
If the
iywheel
is still rotating
when the
starter is
engaged,
the
pinion
and ring
gear
will
clash
and almost
certaidy
be
damaged.
AIso,
as with
all
starting
motors,
the
cranking
time
must be
Iimited
to
prevent
overheating
oj
the startel.
On these
eompact
starters, the
maximum time
allowed
for cranking
is 30 seconds
followed
by a 15 second
cooling
period.
The cranking
limit
is not
unreasonable
for if an
engine fails
to
start after
this
length of
time, ignition
or
carburetion
troubles
are
indicated and these
should
be corrected
before
the engine
is
placed
in
operation'
END
CAP ASSE},IBLY
{includes
-brush)
ARI4ATURE
SPACER WASHER
(S)
(
End
Pl
ay)
+BRUSH
THRU BOLTS
(Torque
40-55 in.Ibs.)
HIGH MOUNT
STARTER
BENDIX
DRIVT
RETAINIIIG
NUT
('l
30-150
jn
.
I bs
.
)
(
a..-irrausT
I'IASHER
lr&/l[lP,l.'
Figure
l2
-
Compoct
Storting
r.8
I