Gravely 424 - Page 17

I
Safep hecautions:
Adequate
ventilation
must be
provided
when bafteries are being
recharged.
Also,
sparks,
open flames
and smoking
should be avoided
since
hydrogen gas
is
produced
which, if ignited,
can cause
an
in-
ternal explosion that
ean shatter
the battery. This
gas
is
produced
in
quantity
only while the battery receives
high
rate of
charge
but
cau linger for
several hours
in a
poorly
ventilated area.
Servie: To
maintain battcry in
top
condition
perform
services at
frequent
intervals:
l. Begularly
check level of
eleetrolyte
-
add water as neoessary
to maintain level above
plates
-
do
not
overffll as this
can cause
poor perforrranoe
or
early
failure
due to loss
of
electrolyte.
2,
Xeep terminals and
top
of battery clean. Wash with
baking
soda and
rinse with
clear
water.
Do not
allow
soda solution
to enter
cells.
3. Check
other
elecEical comp,onents
if battery
repeatedly becomes
discharged.
,yIACNETO
-
ATTEI}IATOI
TYSTEIYIS
Ttre
Magneto-Alternator
System
consists of a
magneto
ignition
circuit
and a battery
cha:g:ng or alteraator
cireuit.
The alternator
system
consisB
of three
maior
components: a
permanent
magnet
ring bolted
to the inside rim
of the
fl)rwheel,
an alternator
stator
assembly whieh is aftxed to the
engine bearing
plate
and a
rectiffer-regulator
unit
which
is externally
mounted
on
the tractor.
Identiffcation
of en$nes
with this system
can be
made
through
the rectiBer-regulator
unit
as shown on the accompanying
illustration.
Operatioa:
As the
magDet
ring is
rotated around
the
stator,
an Alternating Current
is
generated
in the stator
winding.
The AC thus produced
is rectiffed to Direct Current
in the rectiffer-regulator
unit This is
accomplished
th:ough
the use
of solid
state
(no
moving
pa:ts)
electronic devices which
are arranged
to
form
a full wave bridge
recti8er.
Regulation
is
also
provided
by electronic
devices
whieh
'sense'
the
counter-voltage
created by the
bat-
tery to control
or limit
the char$ng rate.
Sine
heat
is
generated
in operation
of certain of these
electrodc de-
vices,
cooling ffns
are
provided
on
the
rectifter-regulator
to help
dissipate
the heat.
Servie;
The
nagneto
oil is
secured to a stator
1rcst
by a
tab which
is wedged betwen
&e
ptrst
aad &e inside
of
the
coll.
If
coil:qilacement
becomes neoessary,
the fywheel
must ffrst
be
removed
to
gain
aco$s to
the stator.
IqAGNETO
STATOR
ll
luos
TO
-
C0NDENSER
-TO
BREAKER
POI
NTS
HI
GfI
LEAD
TENSION
LOI.I'
LEAB
TENSION
Figure
l0
-
Rartiftrr
-
Regulotor Arrcmbly
t8
Figurc ll
-Aliernotor
Stolor
Asrcmbly
GROUND