COATS 4070 Tire Changer - Manual (Page 8)

4 • Important: Always read and follow operating instructions.
6. Place the upper bead loosener shoe on the tire
next to, but not on, the rim (fig. 4). Press down on the
foot pedal until both bead looseners complete their
full stroke. If the top bead is not completely loosened,
release the foot pedal until the unit has completed the
full return stroke and press the foot pedal again. The
ratchet effect on the loosener will deliver a deeper
stroke. The repeat cycle is used only if the upper bead
is not loosened.
Figure 4 - Positioning the Upper Bead Loosener Shoe
Note: If may be necessary to loosen the bead at differ-
ent points around the wheel circumference to entirely
free the bead.
7. Once the tire beads have been loosened from the
bead seat of the wheel, lubricate the beads liberally
with rubber lubricant (fig. 5).
Note: Rubber lubricant makes demounting easier,
helps eliminate damage to the tire beads, and assists
the movement of the combination tool.
Figure 5 - Lubricate Tire Beads
8. Position the combination tool so that it aligns with
the center post key. Insert the demount end of the tool
between the tire and rim. Push the tool down towards
the center post as shown in figure 6 to lift the tire bead
over the rim.
IMPORTANT: Make sure the tool is oriented as shown
in figure 6.
Figure 6 - Align, Insert, and Push Down on the Tool
9. Continue to push down on the tool until the center
post key protrudes through the slot in the tool and the
tool stops against the shoulder of the key. The tool is
now positioned properly for operation of the center post
key (figure 7). Keep a firm hold on the tool at all times to
prevent accidental disconnect.
Figure 7 - Tool Properly Positioned
10. Press down on the foot pedal. The counterclock-
wise rotation of the center post key and combination
tool will remove the upper tire bead from the rim. Lifting
up on the tire with the left hand as shown by the arrow
in figure 8 helps in demounting tougher tires.
Figure 8 - Removing Upper Bead
11. To remove the lower bead from the wheel, repeat
steps 8, 9, and 10.