Every 500 operating hours
BOMAG 79BMP 8500
5.19 Battery service, checking
the main battery switch
Danger of cauterisation ! Danger of explosion!
When working on the battery do not use open
fire, do not smoke!
The battery contains acid. Do not let acid come
in contact with skin or clothes!
Wear protective clothing!
Do not lay any tools on the battery!
For recharging remove the plugs from the bat-
tery to avoid the accumulation of highly explo-
sive gases.
Dispose of the old batteries environmentally.
Maintenance free batteries also need care. Main-
tenance free only means that the fluid level does
not need to be checked. Each battery suffers un-
der self-discharge, which may, in not checked oc-
casionally, even cause damage to the battery as a
result of exhaustive discharge.
The following therefore applies for the service
life:
l Switch off all consumers.
l Check open-circuit voltage of the battery at
regular intervals. At least once per month.
Reference values: 12.6 V = fully charged; 12.3 V =
50% discharged.
l Recharge the battery immediately after an
open-circuit voltage of 12.25 V or less is
reached. Do not perform quick charging.
The open-circuit voltage of the battery occurs ap-
prox. 10 hours after the last charging process or
one hour after the last discharge.
l After each charging process allow the battery
to rest for one hour before taking it into service.
l For resting periods of more than one month
you should always disconnect the battery. Do
not forget to perform regular open-circuit volt-
age measurements.
Exhausted batteries (batteries with formation
of sulphate on the plates) are not covered un-
der warranty!
l Open the maintenance flap and remove the
battery cover.
Fig. 117
l Clean the outside of the battery (Fig. 117).
l Clean battery poles and pole clamps and
grease them with pole grease (Vaseline).
l Check the fastening of the battery.
l On serviceable batteries check the acid level,
if necessary top up to the filling mark with dis-
tilled water.
Checking the main battery switch
l Turn the main battery switch to "horizontal"
position and check by voltage measurement
(ignition key test) whether the batteries are
disconnected from the electric system of the
machine.
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