Thomas
®
XTSR52 Installation and Maintenance
(Page 10 of 13)
Sizes 494-5258
CP3-002
September 2017
Supersedes 09-2016
Rexnord
5555 S. Moorland Rd., New Berlin, WI 53151-7953
Phone: 262-796-4060 Fax: 262-796-4064 www.rexnord.com
8. Final Assembly
8.1 Verify that the hubs have been mounted as shown in Figure 4 to provide the correct “C” length as defined in Table 1. The “C” length is the distance
measured between the faces of the two mounted hub flanges.
If your coupling assembly has a non-standard “C” length refer to assembly drawing of coupling to obtain the appropriate “C” length.
Any disc packs fastened with correct torques between an adapter and a center member should stay fastened.
8.2 If any disc packs are still fastened to the center member and a hub without an adapter, remove the locknuts, overload bushings, and bolts.
8.3 Due to the hub-to-adapter piloting feature when using an oversize hub option, the center member subassembly must be compressed to allow it to
be slipped between the two end hubs. Use the hub-to-adapter cap screws (provided) as defined in Table 2 to compress the center member assembly
by inserting them through the holes in the flanges of the center spool and threading them into the adapter tapped holes as shown in Figure 11B.
8.4 With the hubs mounted, put the center member into place between the two hubs. Hubs with adapters are assembled to the adapters with the cap
screws, lining up the tapped holes in the adapter with the cap screw clearance holes in the hub. If the coupling was assembly balanced, also align
any match marks.
8.5 Place disc pack between the flange of the adapter (or hub if no adapter) and the flange of the spacer and align the bolt holes of the disc pack to the
holes in the adapter (or hub if no adapter) and spacer.
8.6 Lubricate the cap screw threads and insert the cap screws through the hub flange clearance holes and into the mating threaded holes in the adapter.
Tighten each cap screw to the torque as listed in Table 5.
8.7 Remove the cap screws from the spacer flange to adapter, allowing the hub outside diameter to make contact with the pilot diameter of the adapter.
When aligning bolt holes ensure that at each bolt hole position one of the bolt holes in the flanges is the small fitted bolt hole and
the other one in the opposing flange is the large clearance hole as shown in Figure 11.
8.8 Push bolt through small diameter bolt hole and through disc pack until body of bolt is in contact with disc pack bushing.
8.9 Place overload bushing on threaded side of bolt through large diameter flange hole.
8.10 Apply a clean motor oil to the bolt threads and screw a locknut onto each bolt until hand tight.
8.11 Repeat steps 8.6 through 8.10 until all cap screws, bolts, overload bushings, and locknuts are in place.
8.12 Proceed to the other end of the coupling. Remove the support bolts, if used, and continue to support the center member. Repeat steps 8.5 through
8.10 to install the second disc pack.
All bolt threads must be lubricated prior to assembly. A clean motor oil is recommended. Do not use lubricants containing
molybdenum disulfide or greases.
Figure 11 – Disc Pack Bolt Configuration if no adapter
Figure 11C – Disc Pack Bolt Configuration if adapter
Figure 11B - Using Cap Screws for compression if adapter
CENTER MEMBER
COMPRESSION
SCREW (USE
ADAPTER CAP
SCREW)
ADAPTER
Tighten the cap screws equally to compress the disc pack only enough to allow
the center member subassembly to fit between the hubs (do not tighten more
than necessary to provide clearance for assembly).
ADAPTER ASSEMBLY
DISCPACK
BOLT
BOLT HOLE
LOCKNUT
CENTER MEMBER
OVERLOAD BUSHING
CLEARANCE HOLE
