EATON
WSB11206 WCSB Tensioner / Brake with ORB Coolant Ports Installation, Operation and Maintenance Manual E-CLCL-II009-E
August 2015
7
WCSB tensioner / brake with ORB coolant ports
2.1 Preparation
2.1.1
Refer to the appropriate assembly drawing
(available upon request) for appropriate envelope
dimensions, mounting register diameters, mounting
bolt circles and positions, and stud support bracket
recommendations for each specific WCSB tensioner /
brake assembly.
2.1.2 The WCSB tensioner / brake assembly's reaction
member should have a machined register to allow
for mounting and alignment control of the WCSB
tensioner / brake assembly and allow for full support
of the face of the mounting flange / cylinder (112).
2.1.3 For proper operation and service life, the WCSB
tensioner / brake assembly reaction member must
be aligned to the shaft within the limits shown
in Table 1.
Caution
Proper alignment is necessary to ensure that the
friction discs track properly. Improper alignment will
result in excessive wear to the friction material and
mating surfaces, plus the gear and splined bore of
the friction disc assemblies. See Figure 2.
Table 1
Alignment Requirements
Concentricity Perpendicularly
(Parallel, TIR) of
(Angular, TIR) of
Shaft and Tensioner
Mounting Flange to
Size
Inches (mm)Shaft*
Inches (mm)
24WCSB
0.010 (0,25)
0.012 (0,30)
36WCSB
0.010 (0,25)
0.019 (0,48)
48WCSB
0.010 (0,25)
0.025 (0,64)
* Perpendicularity measured near the outside diameter of the mounting flange.
Correct
Incorrect
Figure 2
2.1.4 Refer to the appropriate assembly drawing 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
interference fit for inch shafting and ISO System
S7h6 for metric shafting. Contact Airflex Application
Engineering for specific recommendations.
2.2 Mounting
2.2.1 The WCSB tensioner / brake assembly must be
mounted to a clean, rigid surface with hardened
flat washers and screws of the grade, quantity, and
size as listed in Table 2. 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: Before installing the gear (28) onto the shaft, slide it
into the brake assembly to align the splines in the friction disc
assemblies. Air pressure must be applied to the brake cylinder
(19) to release the friction disc assemblies for alignment. Once
the gear passes through all friction disc assemblies, exhaust the
air to clamp them into position and remove the gear.
Danger
Use only the proper number and grade fasteners
shown in Table 2. 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.
Caution
Water inlets and outlets must be located as close as
possible to the 6 o’clock and 12 o’clock positions,
respectively. This will prevent air pockets in the water
cavity, which would allow the WCSB tensioner /
brake assembly to overheat.
2.2.2 Ensure that the shaft is free of nicks or burrs and the
key fits properly in the shaft and gear.
2.2.3 Apply a light coat of anti-seizing compound to the
shaft and key. Tap the key into the shaft keyway.
Summary of Contents for Airflex WSB11206
Page 1: ......
