WCB11070 (PDF FORMAT)
5
©
Copyright Eaton Corp. 2007, All Rights reserved.
2.1.4
Refer to Table 3 for the setup dimension between the
tensioner mounting surface and the end of the gear
(dimension "A" on
Figure 1
). Gears should be posi-
tioned to ensure that - when the tensioner is mounted
- the disc splines will not overhang the end of the gear
when components are in both new and worn condi-
tions. The gear is typically bored and keyed for a
resulting Class FN2S interference fit for inch shafting
and ISO System S7h6 for metric shafting. Contact Air-
flex Application Engineering for specific recommenda-
tions.
2.2
Mounting
2.2.1
The WCB2 must be mounted to a clean, rigid surface
with hardened flat washers and screws of the grade,
quantity, and size as listed in Table 4. Mounting to a
properly aligned, rigid surface that fully supports the
face of the mounting flange minimizes any deflection
during operation and helps to ensure that the friction
discs will track properly on the copper wear plates.
Note :
To facilitate the mounting process, the friction
disc assemblies should be aligned to the gear and
centered in the tensioner. With the tensioner posi-
tioned with the mounting flange facing down, lower the
gear (28) slowly and carefully into the splined bore of
the friction disc assemblies (7). Adjust the discs so
that they are centered in the tensioner and fit in the
gear. Apply and maintain an air pressure of 25PSIG
(1.7bar) to the cylinder. This will engage and hold the
discs in position during installation. Remove the gear.
Use only the proper number and grade fasten-
ers shown in Table 4. Use of commercial
grade (Grade 2) fasteners where Grade 8 fas-
teners are specified may result in failure of
the fasteners and a sudden and drastic reduc-
tion in brake torque.
Water inlets and outlets must be located as
close as possible to the 6 o'clock and 12
o'clock positions, respectively. This will help
to prevent air pockets in the water cavities,
which would allow the tensioner to overheat.
TABLE 3
“A” dimension on Figure 1 & 2 inches (mm)
Size
Single
Dual
Triple
Quad
8WCB2
1.00
(25.4)
1.38
(35.0)
0.19
(4.8)
N/A
14WCB2
1.06
(26.9)
1.69
(42.9)
1.06
(26.9)
N/A
18WCB2
1.25
(31.8)
1.25
(31.8)
1.25
(31.8)
1.25
(31.8)
24WCB2
1.38
(35.1)
1.38
(35.1)
1.38
(35.1)
1.38
(35.1)
36WCB2
2.36
(59.9)
2.36
(59.9)
2.36
(59.9)
2.36
(59.9)
48WCB2
1.96
(50.0)
1.75
(44.0)
1.75
(44.0)
1.75
(44.0)
TABLE 4
Fastener Description and Assembly Torque - ft.-lb. (Nm)
Item #
Description
Specification
8WCB2
14WCB2
18WCB2
24WCB2
36WCB2
48WCB2
4 Screw &
5 Locknut
Size
#10-24NC
1/4-NC2
5/16-18 NC
Gr. 8
5/16-18NC
Gr. 8
3/8-16NC2
Gr. 8
3/8-16NC2
Gr. 8
Torque, Dry
5 (7)
12 (16)
21 (28)
21 (28)
40 (54)
40 (54)
18 Self
Locking
Nut
Size
1/2-13NC-3 3/4-10NC-3
3/4-10 NC-3
Gr. 8
1 1/8-7 NC
Gr. 8
1 3/8-6 NC
Gr. 8
1 3/8-6 NC
Gr. 8
Torque, Lubed
60 (81)
150 (203)
150 (203)
500 (677)
750 (1016)
750 (1016)
Mounting
Screw
Size
1/2-13 NC-2
Gr.8
5/8-11NC-2
Gr.8
5/8-11NC-2
Gr.8
5/8-11NC-2
Gr.8
1-8NC Gr.8
1 3/8-6NC
Gr.5
Quantity
4
6
10
10
14
14
Torque, Lubed
70 (95)
150 (203)
150 (203)
150 (203)
660 (895)
1100 (1490)
