Tire Removal A N D Installation - Chevrolet 10 Series 1970 Service Manual

WHEELS AND TIRES 10-10
rim s on 40-60 S e ries trucks equipped with w heels of tw o-
p ie c e design (F igu re 4A).
Since it is im portant that these rim s and d iscs be
p ro p e rly matched and since only the wheel d iscs a re
id en tified (s ize stamped on them ), it is recom m ended that
c a re be taken to keep rim s tagged o r id en tified in som e
manner so that they may be assem bled to the c o rr e c t
d isc.
W here sto rage o r tir e r e p a ir situations re q u ire disc
and rim s be separated and the above precautions have
not alread y been taken, the fo llow in g inform ation should
be used to v e r ify rim size :
W h eel Size D im ension A
20 x 5.0
5.0"
.
6 0
20 x 6.0
20 x 6.5
6.5"
F ig . 4 A —T w o -P ie c e W hee l Assemblies
Cast Spoke W heels
Cast spoke wheels with demountable rim s a re available
on 50 and 60 s e r ie s only.
fro m the wheel after rem ovin g nuts and clam ps.
tir e s may then be s e rv ic e d as outlined under "M a in te ­
nance".
CA UTIO N: When rem ovin g wheel, loosen all
nuts approxim ately flush with end of stud, the~n
tap clam ps to loosen w heel.
until clam ps are fr e e as clam p may fly o ff stud.
F ig . 4 — In s ta lla tio n o f Spacer Ring
T ir e Size
7.00-20
"
7.50-20 - 8.25-20
8.25-20 - 9.00-20
D IM E N S IO N
-------- A ---------
R im and t ir e may be rem oved
Do not rem o ve nuts
Installation of Rims on W heels
CA UTIO N: Alw ays in flate tir e s in a safety cage
w henever p ossible o r use a ' clip -o n ' a ir chuck
and stand a sid e.
D u al Wheels
1. B efo re positioning inner rim , thoroughly clean all
contact su rfaces on both rim and w heel.
2. A fte r inner rim is positioned, in stall separator rin g
as shown in Figu re 4.
3. Install outer rim and proceed as outlined under "D u al
and Single W h eels".
D u a l a n d Single Wheels
When installing the tir e and rim on the w heel, the f o l ­
low ing p rocedu re should be follow ed:
A fte r rim clam ps and nuts a re put on lo o s e ly , turn the
wheel until one spoke is pointing straight upward; tighten
the nut on the spoke just snug.
nuts c r is s - c r o s s to m in im ize runout, then tighten the nuts
to the recom m ended torque a ltern ately and evenly to
avoid e x ce ssive runout.
Runout should not exceed 1/8" on fron t wheel o r 3/16"
on re a r wheel.
M a tc h in g S id e a n d L o c k R in g s
Side and lock rings of d ifferen t rim types a re not in te r­
changeable. Some may appear to be, but they do not fit
p ro p erly on the rim base.
sulted fro m the use o f m ism atched rin gs.
rings must be matched according to m anufacturer, s iz e
and type. T h is inform ation is stamped on each part.

TIRE REMOVAL A N D INSTALLATION

Tire M ounting
The
Safety Precautions!
C A UTIO N: A lw ays in flate t ir e s in a safety cage
whenever p ossible o r use a 1 clip -o n ' a ir chuck
and stand a s id e .
When t ir e s a re mounted on d irty o r corrod ed rim s , o r
when they a re not p ro p e rly centered on rim s , the tir e
bead may "bin d" on the rim , and refu se to seat.
ing p ressu re to continue to build up within the assem bly
in an attempt to seat the t ir e bead is a DANGEROUS
P R A C T IC E which can resu lt in seriou s injury to the
servicem a n and a broken tir e bead.
Be Safe!
1. Make sure that rim flan ges and bead ledge (esp e­
c ia lly hump and radius) areas a re smooth and clean.
R em ove any oxidized rubber, d ried soap solution,
rust, heavy paint, etc. with a w ir e brush, o r, in
extrem e cases, a file .
2. Lu b rica te t ir e beads, rim fla n ges, and bead ledge
areas with a lib e ra l amount of thin vegeta b le o il soap
solution, o r approved rubber lubricant.
3. Insure that a ir p ressu re build-up during the bead
seating p ro cess is not allow ed to exceed 40 pounds
p ressu re.
If beads have
reaches 40 pounds, assem bly should be deflated, r e ­
positioned on
Snug up the rem aining
Serious accidents have r e ­
R im base and
not seated by the tim e pressu re
rim , re-lu b ric a ted and re-in fla ted .
CHEVROLET TRUCK SERVICE MANUAL
A llo w ­