Specific Gravity; Cold Weather Operation; Ground Cable - International Harvester Company CUB Operator's Manual

ELECTRICAL SYSTEM
STORAGE BATTERY. Continued
Example No.2
Hydrometer reading. 1.255
Electrolyte temperature. +lOOoF.
Add .008 Sp. Gr. (.004x2)
Corrected Sp. Gr. is. 1.263
Use Ccn accurate hydrometer when testing
for specific gravity. Readings should not be
taken immediately after adding water. Allcells
should show approximately the same
specific gravity reading. Wide variationsindicate
something is wrong.
Liquid Level -Continued
For dependable battery service see your
International Harvester dealer.
Specific Gravity
The specific gravity of the electrolyte
indicates the relative condition of the battery
charge and warns when it may be necessary to
recharge the battery.
Cold
Weather Operation
It is especially important to keep the bat-
tery close to full charge for cold weatheroperation.
Add water to the battery in freezingtemperatures
only when the tractor is to oper-ate
for several hours, to thoroughly mix the
water and electrolyte, or damage to the battery
will result from the water freezing.
The electrolyte of a battery in various
stages of charge will start to freeze at tem-peratures
indicated below:
~
A-30612
Illust.34
Taking a hydrameter reading af electrolyte in the battery
(l2-volt shown).
Specific GraviJY Freezing Temperature
(Corrected to +SO F.) Degrees Fahrenheit
1.265 SOoF.
1.220 30oF.
1.210 20oF.
1.lSO lOoF.
1.160 OoF.
1.140 +lOoF.
1.100 +20oF.
1.000 +30oF.
The temperatures shown indicate the ap-
proximate points at which the first ice crys-
tals begin to appear in the solution. The solu-
tion does not freeze solid until a lower tem-perature
is reached.
A battery three-fourths charged is in no
danger of damage from freezing. Therefore
keep the battery better than three-fourths
charged, especially during winter weather.
If your tractor is not to be operated for
some time during the winter months, it is
advisable to remove the battery and store it
in a cool, dry place above freezing (+32OF .).Place
the battery on a rack or bench.
Inspect the battery once every two weeks to
maintain the correct specific gravity. The
specific gravity of a fully char~ed battery is
1.255 to 1.270 corrected to +80 F. (liquid
temperature). A specific gravity reading of at
least 1.230 corrected to +80oF. should be
maintained. Never allow the battery to fall
below 1.230.
The specific gravity reading will vary withthe
temperature of the electrolyte. For read-ings
taken at any temperature other than +800F.,
a temperature correction must be applied.This
is done by adding .004 specific gravity
for every 100 above +800F., and bJ subtracting
.004 specific gravity for every 10 below+800F.
Ground Coble
When replacing a battery, make certain
that the ground cable is connected to the nega-tive
(-) terminal (on the twelve-volt battery)
or to the positive (+) terminal (on the six-voltbattery).
Note: Before working on any part of the
electrical system, disconnect the batteryground
cable from the battery terminal. Do
not reconnect it until all electrical work hasbeen
,-:ompleted. This will prevent shortingand
causing damage to any of the electricalunits.
1.270
+20oF.
.004x6)
1.246
Example No. 1Hydrometer
reading. Electrolyte temperature. Subtract .024 Sp. Gr. Corrected Sp. Gr. is.
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