Chevrolet 10 Series 1970 Service Manual page 531

General D e s c r ip t io n .............................................................10-1
Maintenance ......................................................................... 10-1
T ire In fla tio n ...................................................................... 10-1
Puncture Inspection and R e p a i r ...................................... 10-1
Jacking In s tr u c tio n s ...................................................... .
T ir e Inflation Tables for Highway Service
Service O p e ra tio n s ................................ ................................10-9
Wheel Nut Torques (Also See Specifications)................ 10-9
C orrecting Irregu lar T ire Wear
INSTALLING TIRES O N MULTI PIECE RIMS
CA U TIO N :
A lw ays inflate tir e s in a safety cage w henever p ossible or
use a 'c lip -o n ' a ir chuck and stand a s id e .
The 1970 truck is equipped with a wide range o f tube
o r tubeless type tir e s and w heels selected according to
the truck GVW rating and type of s e r v ic e .
Duty 10-30 S e rie s truck m odels w ill be equipped with
nylon cord tir e s except the 10 S eries with passenger car
type t ir e s . S eries 40 thru 80 trucks a re equipped alm ost
ex c lu s iv e ly with nylon cord tir e s .
short spoke, p ie rc ed d isc, o r cast spoke type depending
on model application. The dual re a r wheel option is
availab le beginning with the C20 S e rie s trucks.
TIRE TREAD WEAR IN D IC A TO R
The origin a l equipment passen ger type tir e s on 10-20
Light-D uty trucks in corp orate built in tread indicators
to assist in judging when tir e s a re worn out and should
be replaced.
T h ese indicators are m olded into the bottom of the
trea d gro o v e s and w ill appear as bands across the tread
as a visual rem in d er that the tir e should be replaced
(see fig . 1).
When the depth of tread b ecom es l/ l6 -in c h o r le s s as
indicated by the bands, th ere is a significant d ecrea se in
traction and anti-skid p ro p e rtie s , also, the m a jority of
t ir e troubles w ill occur in the last 10% of tir e life .
TIRE INFLA TIO N
T ir e p re s s u re s should be checked at least once a week
and inflated according to the follow in g table.
distribution o r special equipment is such as to im pose
heavy loads on the front axle, inflation of fron t tir e s
SECTION 10
WHEELS AND TIRES
NDEX
Page
10-2
................... 10-2
................................... 10-9
GENERAL DESCRIPTION
A ll L ig h t-
W h eels a re of the
If payload
Wheel and T ire B a la n c in g ................................................10-11
W h e e l s ................................................................................10-11
T ire Removal and In s ta lla tio n ..........................................10-12
Tube T y p e ...................................................................... 10-12
Tubeless T y p e .................................................................. 10-16
RHP Rim s R e p la c e m e n t................................................... .. 10-18
RHP Rim Mounting and Demounting
(T ir e R ep la cem en t)............................................................ 10-19
TREAD
STILL GOOD
F ig . 1-T ire Tread W ear In d ic a to r
should be in creased accordin gly but should not exceed
p res s u re shown fo r re a r tir e s .
• A void underinflation to prevent rim b ru ises, ex c es s iv e
heat, and ir r e g u la r o r rapid w ear.
• A vo id overin flation to prevent tir e ruptures, hard r id ­
ing, ir r e g u la r o r rapid w ear and reduction of skid
resistan ce.
• V alve caps should always be in stalled and tightened
fir m ly to prevent dust and w ater entering and damage
to v a lv e seats. The caps also act as an a ir seal.
Puncture Inspection and Repair
A t each lu brication, tir e s should be checked fo r f o r ­
eign objects in the trea d o r breaks in the tread o r s id e ­
w all. If tir e is punctured
should be rep a ired using one of s e v e ra l re p a ir kits a v a il­
able through t ir e m anufacturers' outlets.
Page
TREAD
WORN OUT
o r otherw ise damaged, it
CHEVROLET TRUCK SERVICE MANUAL