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 TM 10-3930-644-14 & P
(3) Unserviceable If the difference
(a) If cell readings range between 1.230
between the highest and lowest cell
and 1.310 specific gravity, the
is MORE than 50 points (.050)
battery is ready for use.
All it
specific gravity by the hydrometer.
needed was a full charge. Any
variation in the specific gravity
(4) If battery tests "serviceable" by the
between cells within this range does
above tests, but fails to perform
satisfactorily
in
customer's
not indicate a defective battery.
equipment, allow it to stand off
charge 72 hours and test again for
(b) If any cell reads less than 1.230
cell differences as described above.
specific gravity and the battery has
been in service 3 months or less,
NOTE
the battery is good but it has been
Under the Allis-Chalmers Battery
improperly filled (activated) with
Service Adjustment Policy, only the
batteries that are unserviceable as a
electrolyte or water and will give
result of defects in material or
poor performance. To correct this
workmanship are to be replaced at no
condition, empty the electrolyte from
charge or on an adjusted basis. The
any cell reading less than 1.230 and
test procedure outlined above must
refill with 1.265 gravity battery grade
be adhered to as credit to the dealer
electrolyte.
The battery is then
will be made on the basis of results
of tests made on all returned
ready for service.
batteries at Allis-Chalmers branches.
Batteries returned to the branch that
(c) If any cell reads less than 1.230 and
are checked and found serviceable
battery has been in service more
will be returned to dealer at his
than 3 months, it is assumed to be
expense for transportation and
worn out and at best will give very
battery replacement costs.
little useful service.
The battery
6. Charging Battery
should be replaced.
There are two separate methods of recharging
The hydrometer readings should
batteries which differ basically in the amount of
always be corrected for the
charging current supplied, the slow charge
temperature
of
the
battery
method and the fast charge method. The slow
electrolyte. Add 4 gravity points
charge supplies the battery with a relatively low
amount of current for a relatively long period of
(.004) to the reading for every 10 F.
time. whereas, in the fast charge, the battery is
electrolyte temperature above 80F.
supplied with a high current for a short period of
For every 10F.
of electrolyte
time.
temperature below 80F., subtract 4
points from the gravity reading.
The following procedure is recommended when
charging the battery.
d. Test for Serviceability
a. Check the electrolyte level in the cells,
add water as necessary to obtain proper
(1) Cell Differences Read each cell with
level.
a hydrometer. Record individual cell
readings.
CAUTION
Do not overfill. If level is too high,
adjust to proper level by removing
(2) Serviceable
If
the
difference
electrolyte.
(Store
removed
between the highest and lowest cell
electrolyte in a clean jar.)
is LESS than 50 points (.050)
specific gravity by the hydrometer.
b. Leave cell vent plugs in place, check to
see that the vent holes are free to permit
the escape of gas.
R-146-1
3-78
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