Operating The Pneumatic Bead Assist - Snap-On EEWH311A Instructions D'opération

EEWH311A Tire Changer Operation Manual

5.3 OPERATING THE PNEUMATIC BEAD ASSIST

All Snap-on model EEWH311A High Performance
Model come equipped with a specially designed
"Pneumatic Bead Assist Device" (referred to as the
PBA). The PBA offers the combined benefits of both
reducing the amount of physical exertion required by
the tire technician as well as providing an added level
of safety by allowing the machine to do the work rather
then the technician. Simply put the PBA allows the
technician to apply pneumatic power when most
needed in the tire changing process.
The PBA consists of three separate devices which are
attached to a powerful pneumatic cylinder which raises
and lowers the devices as needed.
First is the Upper Bead Roller. The Bead Roller can
be used to drive stiff upper beads down into the drop
center of the rim. This function will be useful both when
lubricating a tire prior to being removed from the rim
as well as when remounting the second bead of a High
Performance or Runflat design tire (Fig. 5.3-1).
Fig. 5.3-1
Move the bead roller into position overtop of the tires
sidewall. While the turntable is turning lower the roller
down into contact with the sidewall. Depress the bead
down 1-2" now you may insert the lubrication swab to
safely lubricate the upper bead.
Second is the Bead Depressor. The Bead Depressor
consists of a formed rubber head mounted on a
movable arm designed to comfortably depress the tires
sidewall. The size and mobility of the arm will allow
the formed head to depress the tire at any position
around the 360 degrees of rotation. The Bead
Depressor will be useful numerous times throughout
the remount cycle. When remounting a tire the bead
depressor will ensure that the bead stays down in the
drop center of the rim until the entire bead has been
remounted onto the rim.
Operation Manual
Once the first bead has been remounted move the bead
depressor into position just behind the mount demount
head. Now depress the second bead down 1-3" . Activate
the turntable, as the second bead moves across the
mount/demount head the bead depressor will follow the
tire around and ensure that the bead does not
prematurely seat causing the mount/demount head to
jam (Fig. 5.3-2).
Fig. 5.3-2
The third tool integrated into the PBA is the Bottom
Bead Roller. This device will be useful at several times
during the demount cycle. First the bottom roller can
be used to unseat a stubborn lower bead which may
have reseated after the bead breaking process and
before tire removal. Secondarily the lower roller can
be used to hold a wide tire up after the first bead has
been removed. This will assist in getting the second
bead up onto the mount demount head (Fig. 5.3-3).
901
Fig. 5.3-3
®
905
903
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