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Snap-On EEWH329A
5.3 OPERATING THE PNEUMATIC
BEAD ASSIST
All Snap-on model EEWH329A High Performance
Model come equipped with a specially designed
“Pneumatic Bead Assist Device” (referred to as the
PBA). The PBA offers the combined benefi ts 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 Runfl at design tire (Fig. 5.3-1).
901
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.
5.2 INFLATING TUBE-TYPE TIRES
Make sure that both beads are properly lubricated.
BEAD SEATING IS THE MOST DANGEROUS PART
OF MOUNTING A TIRE.
NEVER STAND OVER TIRE WHEN ATTEMPTING
TO SEAT BEADS OR DURING INFLATION.
IT IS POSSIBLE TO MOUNT TIRES THAT ARE 1/2”
SMALLER IN DIAMETER THAN THE RIM THAT
THEY ARE MOUNTED ON. WHILE THESE BEADS
WILL SEAL, IT IS IMPOSSIBLE TO GET THEM TO
SEAT IN THEIR PROPER POSITION.
EXPLOSION OF A TIRE MAY CAUSE SEVERE
INJURY OR DEATH.
SAFETY RESTRAINT ARM MUST BE IN PLACE PRIOR
TO ATTEMPTING BEAD SEATING OR INFLATION.
NEVER EXCEED THE MAXIMUM PRESSURE
ALLOWED BY THE TIRE MANUFACTURER.
THE RIM MUST BE UNCLAMPED WHEN INFLATING
BUT ONLY AFTER THE BEADS HAVE BEEN
SEATED.
THE OPERATOR MUST STAND CLEAR FROM THE
WHEEL WHEN INFLATING, AND PRESSURE MUST
BE MONITORED FREQUENTLY TO AVOID OVER
INFLATION.
BEFORE INFLATING A TIRE, CHECK THE
CONDITION OF THE TIRE AND THE RIM.
To infl ate the tire unlock the rim and start infl ating while
pressing the valve towards the inside (necessary to
avoid air pockets forming between tube and tire (Fig.
5.2-1).
537
Fig. 5.2-1
Ensure that the tire is correctly centered on the rim
and complete infl ation.
Summary of Contents for EEWH329A
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