Volvo PV 544 Instruction Book page 25

Servicing
Wheels and tires
9 Check the air pressure
Make a habit of checking the air
pressure in the tires regularly. The
best way to do this is to check [he
pressures every time you fill the fuel
tank. See page 57 for the correct air
pressures. Do not forget the spare
wheel when you check the air
pressure. Even if this wheel is not
used, the air pressure cm go down
and you wi find that the tire is flat just
when you need it. Do not leave the
spare wheel unused for any length of
time but interchange it with one of
the other tires at regular intervals,
The tires with which the car is equip-
ped 2S standard are, according to the
manufacturers, suitable for speeds up
to 160 km.p.h. (100 m.p.h.). For
prolonged driving at high speeds (140-
160 km.p.h. = 90-100 m.p.h.) the
manufacturers recommend that the
pressure should be increased by 0.4
a
kg/cm (6lb,'sq.in.)
If the car is trimmed in such a way
that it can be driven at speeds exceeding
160 km.p.h. (100 m.p.h.]. special high-
speed tires must be f tied.
Tighten the wheel nuts, balance
the wheels
After every 10000 km (6000 milej} the
wheel nuts should be tightened
atorqueof10-Ukgm(7I-100lb.ft.)
The wheels should also be balanced at the
same time if this proves necessary.
If inspection of the tires shows chat
there are particularly worn spots and
unusual wear on the tread, take the
vehicle to a Volvo workihop for th«
wheels to be balanced.
Excessively low air pressure is one of the
most usual reasons for abnormal tire
wear. If pressure is too low, the outer
edges of the tread take the whole
loading and are therefore worn down
very quickly. Insufficiently inflated tires
to
Excessively high air pressure means that
the tire is worn along the centre of the
tread. It also means that the tire cannot
stand up to impact which results in
Changing a wheet
severe tire damage.
Before the vehicle is jacked up, the
handbrake should be applied and one of
the gears should be engaged to make
sure that the vehicle stands still. Liy a
couple of stones or chockj in front of
and behind the wheels that are to
remain on the ground. Do not rely
entirely on the jack, for safety's sake, a
block or something similar should be
used as an extra support under the
vehicle.
Removing
Lever off the hub cap with the help of
1
the spade-shaped lever.
Loosen the wheel nuts to a certain
extent with the help of the socket
and tommy bar. All the wheels
have nuts with right-hand threads
which are loosened by turning In
an anticlockwise direction.
Insert the lifting claw of the jack in
the appropriate jack attachment of
the wheel to be changed. Lift up
the side of the car far enough for
the wheels to turn freely.
Unscrew the wheel nuts com-
pletely and lift off the wheel. Be
careful when lifting off the wheel
so that the threads of the studs
are not damaged.
Fit the new wheel and tighten the nuts
until the wheel Is in good contact with
Fitting
the hub flange. Then lower the vehicle
and tighten the nuts finally. Tighten the
nuts alternately. Fit the hub cap by
striking it smartly with the hand opposite
th« last of the lugs to engage.