WCB 11060 (PDF Format)
9
© Copyright Eaton Corp., 1998. All rights reserved
June, 1998
Table 5
Fastener Description and Assembly Torque - ft-lb (Nm) (Lubed)
Fastener
18WCB
24WCB
36WCB
Item #18
Description
3/4-10NC-3
1 1/8-7NC Gr. 8
1 3/8-6NC Gr. 8
Torque
150 (203)
500 (677)
750 (1016)
Item # 5
Description
5/16-18NC
5/16-18NC
3/8-16NC2
Torque
25(31)
25(31)
40(54)
Mounting
Screw
Description
5/8-11NC-2 Gr. 8
5/8-11NC-2 Gr. 8
1-8NC2 Gr. 8
Quantity
10
10
14
Torque
150 (203)
150 (203)
660 (895)
2.3
Mounting
2.3.1
The WCB must be mounted to a clean, rigid
surface with hardened flat washers and
screws of the grade, quantity, and size and
torqued to the values identified in Table 5 for
each WCB size. Mounting to a rigid surface
minimizes any deflection during operation
and ensures that the friction discs will track
properly on the copper wear plates.
Use only the proper number and
grade fasteners shown in Table 5.
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.
Make sure that the water inlets and
outlets are at the 6 o’clock and 12
o’clock positions, respectively. See
Figure 4 & 5. This will ensure that
there will be no air pockets in the wa-
ter cavity during operation, which
would allow the tensioner to over-
heat.
2.3.2
To facilitate the tensioner mounting process,
the friction disc assemblies should be aligned
to the gear and centered in the tensioner. With
the tensioner laying on the floor, lower the
gear (28) slowly and very carefully into the
splined bore of the friction disc assemblies
(7). Adjust the discs so that they are centered
in the tensioner and fit the gear. Apply and
maintain an air pressure of 25 PSIG (1.7 bar)
to the cylinder. This will engage and hold
the discs in position to facilitate tensioner
installation. Remove the gear.
2.3.3
Ensure that the shaft is free of nicks or burrs
and the key fits properly in the shaft and
gear.
2.3.4
Apply a light coat of anti-seizing compound to
the shaft and key. Tap the key into the shaft
keyway.
2.3.5
Press the gear onto the shaft, making sure
that the dimension between the gear and the
tensioner mounting surface (“A”) is
maintained. See Figure 1- 3 and Table 3.
Heating the gear uniformly to 250
o
F (121
o
C)
will expand the bore and ease assembly.
For an Airflex supplied plated gear,
do not heat the gear to more than
300
o
F (150
o
C). Temperatures in
excess of 300
o
F (150
o
C) will cause
the plating to separate from the gear.
2.3.6
Apply a thin coat of Molub-alloy
®
412ES to
the gear teeth.
2.3.7
Using lifting equipment and straps, lift the
tensioner and slide it over the gear. Fasten it
to the mounting surface using the hardware
called for in Table 5.
2.3.8
Torque the screws to the values called for
in Table 5 using a crosswise tightening
sequence. Release the air pressure applied
in 2.3.2
