Chevrolet DB90 Series, Service Manual

Page: 207 / 242

S ec. 10-201
WHEELS AND TIRES
RIM AND WHEEL SAFETY PRECAUTIONS
CAUTION
An inflated tir e and rim can be very dangerous. Many accid en ts,
so m e fatal, have resu lted from im proper handling and operation of truck
r im s and w h eels. It .is , th erefo re, of the utm ost im portance that the
p recau tion s outlined in th is sectio n be carefully noted by a ll p er so n s
concerned in order to avoid p erso n a l in ju ries and c o stly dam age.
HOW TO PREVENT RIM ACCIDENTS
(R efer to F igu re 20)
DURING TIRE DEMOUNTING
C om pletely D eflate T ire P r io r to Demounting
(R efer to F ig . 20. View A)
If either rim or rin gs are damaged or ring
appears to be unseated, the tir e should be deflated
p r io r to rem oval of the tir e and rim assem b ly
from the veh icle.
F ir s t, reduce the p r e ssu r e by pushing the
plunger, then rem ove the en tire co re. Keep your
e y e s away fro m the valve.
R em ove valve c o re to en su re com plete de­
flation.
Follow Recom m ended Demounting P roced u res
S ee p revious p ages of this section fo r demount­
ing in stru ction s.
Check For D am aged o r Worn P a rts
Mark d efective p arts for destruction to p r e ­
clude th eir future u s e .
DURING TIRE MOUNTING
R eplace Dam aged P a r ts
A buse during road operations or in mounting
the tir e can cause dents, crack s o r d istortion s which
weaken the p arts and p revent sa fe , proper a s s e m ­
bly.
BEFORE mounting a tir e and assem b lin g the
rim , in sp ect the rim p arts carefully for dam age,
ru st, and d istortion . Avoid the u se of r im s, locking
rin gs o r flan ges which a re out of shape, rusted,
o r broken. Avoid the u se of a ring or r im p arts of
d ifferent manufacture than the rim , o r of any dif­
feren t s iz e or type than the rim .
Avoid the u se of any lubricant which contains
w ater o r solven t that is injurious to rubber. A com ­
bination lubricant and ru st-p reven tive compound is
p refera b le. T his p r o tectiv e m easu re is of particular
im portance with d rop -cen ter tu b ele ss r im s a s the
a ir in the tir e is contained by the t ir e - s id e rim
su r fa c e .
R em ove R ust and Other F oreign M atter
Accum ulation of such m aterial in the rim gut­
te r can prevent the proper fitting of rin g s. P arts
that a re e x c e s s iv e ly corroded are weakened and
should be rep laced . U se of a rust preven tive com ­
pound (not containing water) during mounting w ill
m in im ize rusting.
Do Not U se O v er-S ize or O ver-Inflated T ir e s
U se only p re fe r r ed or a lte r n a te -siz e rim s for
tir e s and do not exceed recom m ended air p r e s s u r e s
(s e e page 205). T hese are com m on c a u ses of rim
fa ilu r e s and accid en ts.
F ollow R ecom m ended Mounting P roced u res
See p reviou s p ages of th is sectio n for mounting
in stru ctio n s.
ADDED PRECAUTION: R e-ch eck a sse m b lie s
just p rio r to inflation, p articu larly if they have
been ro lled a c r o s s the floor o r have re c e iv ed rough
handling betw een mounting and inflation.
R im Ring Seating (F ig. 20, V iew B)
MAKE CERTAIN the rim ring i s seated to the
fu ll depth of the groove, fits tightly a ll around, and
is s e c u r e ly locked. With certain types of w h eels,
how ever, it is n e c e ssa r y to se a t the rin gs w hile the
tir e is being inflated. In eith er c a s e BEFORE in ­
flating.
Safety D ev ice o r Cage (F ig. 20, View C & F ig. 21)
ATTACH A PORTABLE SAFETY DEVICE,OR
USE SAFETY CAGE. MADE ESPECIALLY FOR
THE PURPOSE. TO THE ASSEMBLY. T his p o rt­
ab le device can be u sed w ith a ll typ es of w h eels
and r im s.
Or, if the a ssem b ly is not of the type which
req u ires inflation to sea t the rin g s, a SAFETY
CAGE can be u sed . T h is i s recom m ended to p r e ­
vent p erso n a l injury during inflation. An inflated
tir e contains potentially ex p lo siv e energy that can
blow rin gs lo o s e . A clip -o n type a ir chuck should
a lso be used , so that the operator can stand to one
sid e during tir e inflation.
A void a p osition w here the fa c e or body is
im m ed iately ov er the work beihg done on any tir e
CHEVROLET SERIES 70-90 HEAVY DUTY TRUCK SHOP MANUAL SUPPLEMENT