TC39 Series Changer Operation Instructions  Getting Started •
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• 11 
Use the following tips to prevent this type of tool head damage: 
•  DO NOT ROTATE while pressing the “Tool Head Raise” button. 
•  Ensure tool head cradles the rim edge before rotating during demount of 
upper bead. 
 
 
TOOL HEAD NOT CRADLED ON RIM  TOOL HEAD CORRECTLY POSITIONED 
 
 
 
 
 
 
 
If the tool head breaks at the mount/demount end the tire bead was not in the drop 
center when mounting the upper bead. 
Use the following tips to prevent this type of tool head damage: 
•  The bead MUST be in the drop center when mounting the upper bead. 
•  Use the bead press device and the upper roller to guide the bead into the 
drop center. 
•  Ensure the bead is completely in the drop center on wheels where the 
drop center is far from the bead seat. 
 
BEAD FULLY IN DROP CENTER
Mounting 
Bead not drop center.