Volvo 120 Operating Instructions Manual page 22

SERVICING
33 Check the state of charge of the battery
The state of charge of the battery should be checked after every 10 000
km (6 000 miles). The check is carried out with the help of a hydro-
meter, this showing the specific gravity of the electrolyte which varies
with the state of charge. See page 55. When checking the battery,
check also the terminals and terminal bolts to make sure they are
well tightened and smeared with grease or vaseline. If necessary, wipe
off the terminals and terminal bolts with a rag or brush them with
a wire brush before greasing them.
34 Check headlight alignment
The alignment of the headlights should be checked in a Volvo workshop
after every 10 000 km (6 000 miles). Remember that the section of the
road lit up by the headlights can vary depending on the load in the
vehicle.
Replacement of bulbs
To obtain maximum lighting effect and to forestall the chances of
lights going out, the headlights bulbs should be changed every year,
suitably during the Autumn. Some of the bulbs have two functions,
for example, the headlight bulbs which have filaments for both main-
beam and dipped lights. The guide pins on the sockets of these bulbs
are either of different thickness or they are staggered so that the bulbs
can only be fitted in one definite position. Certain makes of bulbs
have a "Top" mark on the socket and this should face upwards.
Replacing the roof light bulb
When replacing the roof light bulb,
the lamp shade is pulled straight
out.
When fitting headlight bulbs do not
touch the glass with your fingers. The
reason for this is that grease, oil or any
other impurities can be carbonized onto
the bulb and this can cause damage to
the deflector.
Replacing the headlight bulbs
Loosen the three screws retaining the
the rim with a screwdriver.
Pull out the bottom part of the rim
slightly and then lift upwards so that
the retainer catch releases its grip. (Do
not pull out the headlight rim so far
forwards that the catch at the top be-
comes bent, otherwise water can pene-
trate into and damage the reflector.)
Loosen the screw on the underside of
insert. It is not necessary to remove
these screws completely. The insert can
be removed by turning it in an anti-
clockwise direction.
Remove the bulb holder contact and
take off the rubber sleeve. Remove the
spring fixing the lamp holder in the
correct position.
The bulb and holder are changed com-
pletely as one unit. When fitting the
bulb holder into the insert, make sure
that the small spring retainer engages in
the notch.