Firestone EMDG198 - Manual (Page 10)

10
When using bead rings, THE CUSTOMER WILL NEED
TO FABRICATE HIS OWN MOUNTING PLATES. Hot or
cold rolled steel provides satisfactory mounting surfaces,
with specific finishes of 32 micro-inches, if machined in a
circular fashion, and 250 micro-inches when ground (side
to side). The thickness of mounting plates depends upon
the application. The plates must be strong enough and
backed by structural members to prevent bowing (of the
plates) when subjected to the forces or loads involved.
The rubber bellows provides its own seal; therefore, ‘O’
rings or other sealants are not needed when installing the
part.
INSTALLATION
Follow this technique for assembling a bead ring style bel-
lows to the mounting plate:
a. Insert the bolts into the bead ring (the bead rings have
been previously attached to the bellows at the factory).
The bolts will be pulled into place by the action of tighten-
ing the nuts.
b. Slip all of the bolts (which are protruding through the
bead ring) into the mating holes of the mounting plate
and attach the lockwashers and nuts. FINGER TIGHT-
EN all nuts to produce a uniform gap between the bead
ring and mounting plate all the way around.
c. At this point, make certain that the bellows bead is prop-
erly seated under the bead ring.
PLEASE NOTE THAT UNIFORM SUCCESSIVE TIGHT-
ENING OF THE NUTS IS IMPORTANT TO SEAT THE
RUBBER BEAD PROPERLY TO THE MOUNTING
PLATE FOR ITS FULL CIRCUMFERENCE.
Continue with the following sequence:
d. Tighten all nuts one turn each, moving around the circle
until continuous contact is made between the bead ring
and mounting plate.
e. Torque all nuts to the torque specifications shown on the
page, going at least two complete turns around the bolt
circle.
MATERIAL
Bead rings are supplied in either steel or aluminum. Steel
bead rings can be of two different types. Both the bead ring
material and type of ring are called out in the description
section of the order block on each individual data page.
Also, the bolt length (for the bolts supplied with that particu-
lar order number) is given.
WHERE A BEAD PLATE PART IS SHOWN AND THE
BEAD RING ATTACHMENT IS PREFERRED, PLEASE
REFER TO THE SELECTION GUIDE ON PAGE 32 FOR
BOLT CIRCLE DIAMETERS AND NUMBER OF BOLTS
(EACH RING).
BUTTON HEAD STEEL
BEAD RING COUNTERSUNK STEEL
BEAD RING RIBBED NECK
ALUMINUM
BEAD RING SOCKET HEAD
ALUMINUM BEAD RING*
Optional Shorter Length
Ribbed Neck Bolt
Used on
4.5 in.
Bolt
Circles
Use M6
Cap
Screws,
(Not
Included)
Customer
Supplies Plate
Effective
Length
Bolt
Length
Customer
Supplies Plate
Customer
Supplies
Plate
Customer
Supplies Plate
Effective
Length
Bolt
Length
Effective
Length
Bolt
Length
Standard Bolt Length (in.) Standard Bolt Length (in.) Standard Bolt Length (in.)
1 7 / 8 1 5 / 8 1 7 / 8
Standard Effective Length (in.) Standard Effective Length (in.) Standard Effective Length (in.)
1.28 1.22 1.28
Standard Order Number Standard Order Number Standard Order Number
(bolt only) (bolt only) (bolt only)
WC1-358-3607 WC1-358-3625 WC1-358-3620
Thread Thread Thread
5 / 16 -24 UNF 5 / 16 -24 UNF 3 / 8 -24 UNF
Tightening Torque (ft.-lbs.) Tightening Torque (ft.-lbs.) Tightening Torque (ft.-lbs.)
17 to 22 17 to 22 28 to 32
END CLOSURE OPTIONS
THE FOUR TYPES OF BEAD RINGS
BEAD RINGS CONTINUED
*Available only on style #16, #25, and #255-1.5