Allis-Chalmers WD Operating Instructions And Repair Parts Illustrations page 22

BATTERY - The starting and lighting system
uses a six volt battery, designed and built
to meet the requirements of the tractor.
Check the electrolyte (solution) in the battery
at least once each week to see that it is at
the proper level. This level should be main-
tained to lower edge of filler tube (which is
about l/4" above top of separators). The
battery supplied with your tractor has a lead
washer type valve in the filler tube to pre-
vent over filling. Never add anything to the
solution except DISTILLED or RAIN water.
Boiled water will not do. The supply of water
should be kept in clean, covered vessels of
glass, china, rubber or lead.
Do not allow lighted matches or an open
flame of any kind near battery cell covers.
The need for frequent addition of water to
battery, indicates the charging rate maintained
is too high.
In cold weather, add water only immediately
before running the engine so that the charging
will mix the electrolyte and water and prevent
freezing. A fully charged battery will not
freeze in very cold temperatures, but if only
partly charged, will freeze and be ruined at
much higher temperatures. Weekly readings
of each battery cell should be taken with a
battery hydrometer.
. as follows: 1.280, full charge; 1.225, half
charge; 1.150 discharged.
By taking frequent readings with the hydrom-
eter, it is possible to keep generator charging
rate so adjusted as to have battery fully
charged, but not over charged. When taking
the readings, return the electrolyte to the cell
from which it was taken.
Due to the infrequent use of tractor in cold
weather and the extra amount of electrical
energy required by starting motor, it is
usually necessary to use a higher charging
rate than in summer, to keep battery fully
charged. Refer to instructions on ammeter
for charging information.
ELECTRICAL SYSTEM (Cont'd.)
The readings indicate
Keep the battery clean by using a stiff bristle
brush -- not metal. If terminals are corroded
or if the battery is acid soaked, wash with
soda solution (l/4 lb. of soda to one quart of
water). Vent plug must be kept in place when
cleaning battery. After washing battery check
gas escape holes in vent caps making sure
they are open.
from tractor, disconnect the grounded posi-
tive terminal first. When re-installing be
sure the ground cable is installed last and
connected to the positive post. Battery box
cover should be in place and tightened snugly
to prevent battery from being damaged by
vibration. (Be sure that wood spacer is be-
tween top of battery and cover.)
In event the tractor is not to be used for some
time, it is advisable to remove the battery,
have it fully charged and stored in a dry
basement or some similar place where the
temperature is to be as low as possible, but
above freezing.
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If the battery is removed