73
Checking the acid level
First charge discharged batteries and,
if necessary, then top up with distilled
water.
The battery acid level falls due to
evaporation of water, especially dur-
ing high ambient temperature.
The acid level is correct when it is
just above the filling hole insert
or
approx. 5 mm above the top edg-
es of the plates.
Measuring the acid density
The measurement of the acid density
with the acid tester gives an insight
into the actual charge state of the bat-
teries.
Observe the brochure < Safety infor-
mation >, section entitled < General
information on electrical systems >!
With compressed ball pump, insert
the tube for sucking out the acid
into the cell opening and sub-
merge it into the acid (as in fig. 47).
Suck out the acid by releasing the
ball pump (fig. 47).
The indicator float must swim free-
ly in the acid (fig. 47).
Compare the acid level with the
charge scale of the float.
47
Charge batteries immediately if the
acid level of a cell is below the scale
value of 1.18*.
The battery is fully charged when the
acid levels of all cells are above the
scale value of 1.28*.
The differences between the individ-
ual cell values should not exceed an
acid density of 0.02 to 0.03 kg/dm³. If
it does, this can be due to battery
damage. Seek the assistance of a spe-
cialist workshop!
