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 positioned 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
conditions. The gear is typically bored and
keyed for a resulting Class FN2S interfer-
ence fit for inch shafting and ISO System
S7h6 for metric shafting. Contact Airflex Ap-
plication
Engineering for specific recommendations.
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 positioned 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 fasteners shown in Table 4.
Use of commercial grade (Grade 2)
fasteners where Grade 8 fasteners
are specified may result in failure of
the fasteners and a sudden and
drastic reduction in brake torque.
Water inlets and outlets must be
located as close as possible to the
6 o’clock and 12 o’clock posi-
tions, respectively. This will help
to prevent air pockets in the water
cavities, which would allow the ten-
sioner to overheat.
TABLE 4
Fastener Description and Assembly Torque - ft.-lb. (Nm)
Item #
Description
Specification
8WCB2
14WCB2
18WCB2
24WCB2
36WCB2
48 WCB2
4 Screw &
5 Locknut
Size
#10-24NC
1/4-NC2
5/16-18 NC
Gr. 8
5/16-18 NC
Gr. 8
3/8-16-NC2
Gr.8
3/8-16-NC2
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 3/4-10 NC-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
1-8 NC 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)
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)
WCB 11070 VP 4.2 Format
7
© Copyright Eaton Corp., 2003. All rights reserved
April 2002 (Revised June 2003)
