Firestone EMDG198 User Manual download pdf (Page 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.)

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

-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

1 2 ... 5 6 7 8 9 10 11 12 13 14 15 ... 101 102

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Firestone EMDG198 User Manual Page 10

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