117
4.14 Wheels and tyres
Maintenance
Wheels and tyres
Tyres are to be examined
periodically for damage, foreign
objects and wear.
You should look for :
●
Bumps or bulges in treads or
sides of tyre. Replace tyre if you
find either of these conditions.
●
Cuts, splits or cracks in the side
of the tyre. Replace tyre if you
see the fabric or chord.
●
Excessive tread wear.
Tyres can give satisfactory service
only if the load carried by each tyre
and pressure is within specified limit.
For this reason maximum
recommended GVW must never be
exceeded as otherwise life of tyres
will be adversely affected.
Under inflation and over inflation are
both injurious to life of tyres.
Therefore, correct tyre pressure must
be maintained at all times. It is
possible that after initial inflation of
tyres in cold condition, there is a rise
in pressure after vehicle has travelled
some distance and tyres get hot. Tyre
pressure should not be corrected
under these conditions because if
tyre pressure is corrected at this
stage, it will result in under inflation
when it cools down.
It is good practice to have best tyres
on front axle for operational safety of
the vehicle. However, it is essential to
match size of the tyres so that all
tyres on the same axle have more or
less same degree of wear. Fitting
tyres of size other than specified will
have a number of adverse effects
and therefore should be avoided.
Wheel changes
When changing wheels observe
specified tyre load capabilities and
pressures.
Secure the vehicle to prevent rolling
by using suitable wheel chokes.
The jack should be applied at front
axle towards front, below spring pack
(i.e. below 8th leaf ).
Never put the jack below the
differential housing.
Specified tightening torque for
wheel nuts is 35-40 mkg.
Jack location at front
Jack location at rear
