TRUCK SERVICE MANUAL
WHEELS, RIMS, TIRES
With the improvement in design of both wheel bolt
lubricate top bead thoroughly. Insert spoon ends
holes and mounting bolts or nuts the left-hand threaded
of both tire irons between rim and tire bead at
parts are no longer used and right-hand threaded parts
points about 10" apart. While standing on tire, pull
are used at all wheels. To prevent loosening of wheel
end of tire iron to the opposite side of rim so as to
bolts or nuts, cup-shaped depressions are formed in
pry tire bead up and out of rim (Fig. 30).
wheel disc at the bolt holes so that when mating cup-
Hold tool in position with one foot and pull second
shaped nut or bolt is tightened, elastic pressure against
tool toward center of rim (Fig. 31). Progressively
the nut or bolt together with thread friction prevents
work bead off rim in this manner, taking additional
loosening in service. For this reason wheel mounting
bites as necessary.
bolts, nuts and wheel bolt hole surface must not be
It is good practice to tighten wheel nuts daily during
the first 500 miles of service on new vehicles and
anytime wheels have been removed. Regular inspection
periods should be established to assure keeping nuts
ONE PIECE DROP CENTER HEAVY DUTY TUBELESS
TIRES (7.00-20 and Up)
The mounting or demounting of heavy duty tubeless
truck tires is accomplished in much the same manner as
light duty or passenger-car type tubeless tires.
Consequently, same precautions for protecting the
sealing edges of the tire beads and rims should be
observed. Rims used are all of the one-piece drop-
Stand assembly in a vertical position and lubricate
center type whether they are integral with wheel (disc
second bead. At top of assembly, insert straight
type) or demountable (cast type). Because heavier tires
end of tool between bead and back flange of rim at
are less flexible, it is suggested that the special tubeless
about 45 degree angle (Fig. 32).
truck tire tools, which are available, be obtained.
Remove the valve core to completely deflate tire.
With tire lying flat on the floor, loosen beads from
rim seats by walking around on tire with heels at
points close to rim. With wide side of rim down,