4-56. WHEEL/TIRE ASSEMBLY REPAIR (THREE-PIECE WHEEL)(CONT).
Insert the goose-necked end of two tire irons
between tire (6) and side ring (8)
approximately five in. (13 cm) apart.
Ensure not to tear the chafer
fabric when unseating the tire
bead or damage to tire may
Use tire lubricant as necessary
to avoid damaging tire beads
or bead seats during
Pry both tire irons outward and sideways
through an arc of about 70 degrees. Leave
one tire iron in position and place the
second tire iron approximately five in. (13
cm) away. Repeat this procedure until tire
bead (9) is completely unseated.
Lock ring is under tension. If lock
ring breaks loose it could cause
injury to personnel. Keep hands
and fingers away from
lock ring when removing.
Ensure side ring and tire side wall
are depressed below lock ring and
Using tire iron, pry under lock ring (7)
and remove from lock ring groove (10).
Remove preformed packing (11) from
preformed packing groove (12). Cut in
two and discard preformed packing.
Remove side ring (8) from tire (6).
Wheel/tire assembly weighs 425 lbs (193 kg). Use suitable lifting device to lift wheel/tire
assembly and prevent possible injury to personnel.
Using lifting device, turn wheel/tire assembly (1) over on blocks so flange is facing up.
Repeat Step (7) to unseat tire bead (9) from wheel/tire assembly (1).