Chevrolet DB90 Series, Service Manual

Page: 209 / 242

S ec. 10-203
in which th ere is p r e ssu r e (fig. 20, V ie w D ).
U se only accu rate, tested gauges to ensure
proper a ir p r e ssu r e . Check a ll gauges regularly
w ith a m aster gauge.
Drop Center W heels (Fig. 20. View E)
IN CHANGING TIRES on drop center w h eels,
rem ove w h eels fro m the truck and p la ce on a wheel
holder or tir e changing m achine, rem oving and
mounting the tir e s in th is way. G reater speed and
e a se thus can be obtained than by making the change
with the w heel on the veh icle.
This a lso w ill prevent cuts on hands and w r ists
from fender edges and w ill make it u n n ecessary to
u se a ham m er for seatin g the tir e .
U se only standard tir e mounting to o ls and
equipment. The u se of m akeshift to o ls, screw d riv ­
e r s or p lie r s to fo rce tir e s on or off rim s or w h eels
is dangerous.
A ll Wheel and Rim A sse m b lie s
(R efer to F ig. 20, View F)
IN THE SERVICING OF ALL TIRES u se cau­
tion not to drop them , or the w h eels or a s s e m b lie s ,
on the feet, hands, o r body, or heavily on the floor.
Learn how to lift properly - - u se your le g s
as w e ll a s your body. T his can help prevent pain­
ful, internal injury o r rupture.
T ire Iron Safety (F ig. 20. View D)
BE CAREFUL IN USING TIRE IRONS, p a r tic ­
u la rly a s to gripping them fir m ly and keeping the
hands fr ee of o il and g r e a s e . The iron s can slip
and fly with trem endous fo rce.
H am m ers (Fig. 20, View G)
USE CARE IN HAMMERING RINGS OR RIMS
WITH STEEL HAMMERS. Sm all b its of ste e l may
be broken off the ham m er o r rim , flying into the
eye, fa ce, or body.
U se ru b b er-covered steel-h ea d ed ham m ers
w h erever p o ssib le .
Do not ham m er on r im s or rin gs after tire
inflation has started .
Changing Equipment (F ig. 20, View H)
TIRE SPREADER ARMS CAN BE DANGEROUS.
Keep them c lo se d when the machine is id le and
u se care in a ll r e sp e c ts w hile operating the spreader
F a ce and E ye P rotection
ALWAYS WEAR GOGGLES or fa ce sh ield s
when buffing r im s or tir e s , or when ham m ering
rin gs.
DURING VEHICLE OPERATION
Do Not O verload T ir e s
E nsure that the combination of load and veh icle
WHEELS AND TIRES
Figure 21 —S a fely Cage ITypicalI
weight does not ex ceed the rated load of the tir e s
u sed . R im s are designed to sustain the maximum
rated load of the maximum tir e s iz e recom m ended
for that rim (s e e page 205).
Do Not E xceed Maximum Inflation P r e s s u r e s
This is determ ined by the s iz e and ply rating
of the tir e (s e e page 206). It is a lso im portant to
m aintain uniform inflation in both tir e s of a dual
a ssem b ly so that w eight is equally sustained.
Do Not Run V eh icle on One T ire
of Dual A ssem b ly
When th ere is lo s s of air in a dual tir e the
carrying capability is reduced and the load m ust
be sustained by the other tir e and rim . Both tir e s
should be inflated to balanced, reco m m en d ed p res-
su r e s before further operation.
N ever R e-Inflate a T ir e That Has B een Run Flat
Without F ir st Thoroughly Inspecting It and
The Rim and Wheel A ssem b ly
It is e sp e c ia lly important to make su re the
lo ck ring is se c u re in the gutter and has not been
damaged p rior to re-in fla tio n .
P er io d ica lly Check Clam ps and Wheel Nuts
L oose clam ps can ca u se dangerous rim s lip ­
page or detachment of rim and tir e from the v e ­
h icle w hile in m otion. L oose w heel nuts can cau se
dangerous w heel shim m y and lo s s of v eh icle con­
tr o l. E x c e ssiv e torque is a lso dangerous in that
it can cause stud and ring break age. R efer to page
205 for torque recom m endations.
CHEVROLET SERIES 70-90 HEAVY DUTY TRUCK SHOP MANUAL SUPPLEMENT