Hunter TCX56 Operating Instructions Manual page 32

If the automatic lever does not completely seat under the upper bead, continue to
rotate until it does.
Press the wheel rotation pedal
Position the valve stem directly beneath the tool head.
Pull up on the automatic lever to pull the bead over the edge of the rim.
32
GOOD
MOUNT HEAD CORRECTLY
PLACED
THIS CAN DAMAGE THE TIRE
MOUNT HEAD INCORRECTLY
NOTICE
until the valve location is in the one o'clock position.
Operation Instructions for TCX56/57 Tire Charger
BAD
WARNING
PLACED
VALVE
STEM