COATS Extended Mobility (EMT) RunFlat Tires - Manual (Page 17)

The Objective of this Section:
To demonstrate the safe and proper demounting of exceptionally stiff sidewall tires on wheels
with a valve-type low-pressure sensor installed. To demonstrate the use of a metal duckhead.
Safety Issues Related to this Section:
• ALWAYS wear eye protection during tire service activity.
• ALWAYS wear durable work clothing (i.e.; tight-fitting leather gloves, steel-toed shoes, back belts).
• NEVER wear loose fitting clothing or articles, jewelry, or long hair.
• ALWAYS deflate the tire completely and loosen both beads before beginning the demount procedure.
1 Lubricate the upper tire bead and the wheel liberally
with a slow-drying tire lubricant. Use the lift bar to help
push the sidewall down and provide easier access to the
bead and wheel. Rotate the wheel and lubricate the entire
circumference.
1A Make sure to adequately lubricate the horizontal
wheel surface above the drop center and below the
safety hump. This will help the tire bead slide into the drop
center of the wheel opposite the duckhead.
2 Move the swing arm into position. Adjust the duckhead
so that it is 1 ⁄
8
to 3 ⁄
16
inch away from the wheel.
NOTE: Always use a plastic bootie on metal duckheads. This
will help prevent damage to the wheel.
3 Rotate the wheel until the valve stem is under the rear
portion of the duckhead.
Position a drop center tool directly across from the duck-
head to help the tire slide into the drop center as the bead is
lifted over the duckhead. If a drop center tool is not available,
a valve stem can be used as an aid. Insert it between the tire
and wheel across from the duckhead.
Lubricate the end of the lift bar. Insert the lift bar between the
tire and wheel, immediately next to the duckhead.
4 Begin rotating the lift bar down over the duckhead to pull
the tire bead up and over the duckhead. Move the tool
slowly and do not rush.
Remove the drop center tool (or other aid) as the bead slides
into the drop center of the wheel.
Demounting–Valve-Type Sensor E–1
10
min
Stop Time
E