Chevrolet 10 1971 Series Chassis Service Manual Download

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WHEELS AND TIRES 10-2

t r e a d

STILL G O O D

W O RN OUT

Fig. 3 — Passenger Type Tire Tread W e ar Indicator

Tread Wear

When the depth of tread becomes 1/16-inch or less,

there is a significant decrease in traction and anti-skid
properties, also, the majority of tire troubles will occur
in the last 10% of tire life.

The original equipment passenger type tires on Series

10 trucks incorporate built in tread indicators to assist

in judging when tires are worn out and should be re
placed.

These indicators are molded into the bottom of the

tread groove and will appear as bands across the tread
as a visual reminder that the tire should be replaced

(see fig. 3).

MAINTENANCE

WHEEL NUT TORQUES

On a new vehicle or after the wheel has been changed,

the wheel nut torque must be checked at 100, 1,000 and

6,000 miles and every 6,000 miles thereafter.

TIRE ROTATION

The rotation of truck tires will minimize tire trouble

and  produce  longer  tire  life.  ;With  rotation,  accelerated
and  irregular  tire  wear  on  any  One  particular  tire will
be  spread  out  over  the  entire  set,  and replacement fre

quency will be reduced. Tire wear may also contribute

to such trouble as poor handling and shimmy.

No definite tire rotation formula is applicable to all

trucks because of the wide range of usage. However,

certain fundamentals, mixed with experience and obser

vation, will assist the trucker in reducing tire costs.

A rotation sequence that moves the front tires to the

rear is a general recommendation. Due to different

loading conditions on the wheels, new tires which are

broken in on the front wheels usually produce the great
est overall tire life.

The outer tire on a dual wheel will skid or drag on a

turn  because  of  the  difference  in  the turning radii  of the
inner  and  outer  tires.  This results in faster wear  of the
outer  tire.  In  general,  the tire with the  largest diameter
or  least  wear  should be at the outside of each dual wheel.
In  addition,  certain  truckers  have  found when trucks are

operated continuously on high crown roads an increase

in air pressure of from 5 to 10 pounds in the outside tire
of each dual produces maximum tire life.

To equalize wear it is recommended that the tires be

rotated  every  6,000  miles.  Upon  rotation,  tire pressure
must  be  adjusted  (front  and  rear)  in accordance with the
recommendations  in  the  "Tire  Load  and  Inflation  Pres
sure" table.

Inflation Pressure

Standard inflation pressures for tires are listed in the

"Load Capacity Chart" in the Section 0, "General Infor

mation," in this manual. These are the minimum re
quired tire pressures for maximum permissible loads.

The use of improper tire inflation pressures can affect

tire  life  and  load  carrying  capacity,  and  may  affect ve
hicle  handling.  Inflation  pressures  should  be  checked at
least  once  a  month  (and preferably more often)  to insure
that  the  right  amount  of  air  is  contained  in the tires.
With  regard  to  tire  life,  too  little  air  pressure  allows

abnormal deflection of the tire causing excessive operat

ing temperatures, while too much air pressure prevents
normal deflection, making the cord body more vulnerable
to road impacts.

Use of optional inflations is allowable only with a re

duced load.

When operating at loads greater than the optional re

duced load, the inflation pressure must be increased to
the standard inflation for full rated loads.

TIRE LOAD AND INFLATION PRESSURE

Inflation pressures shown below for passenger type tires are for normal ride

and  handling  use.  Pressures  may be  required  up  to  a  maximum  of 32  psi  cold
for  load  range  B  tires  or  36  psi  cold  for  load  range  C  tires  for  maximum  load
carrying  capacity.

Chevrolet 10 1971 Series, Chassis Service Manual

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