EATON
Torque Limiting Coupling Installation, Operation and Maintenance Manual E-MEQD-II002-E September 2015
8
Torque Limiting Coupling
2.2.3
All mounting fasteners must be of the proper size
and grade, and torqued to the appropriate value.
See Table 1.
Warning
Use only the proper grade and number of mounting
fasteners. Using commercial grade fasteners
(Grade 2) in place of Grade 8 fasteners (where
called for) may result in failure under load,
causing personal injury or equipment damage.
2.3
Mounting spider and drum hub
2.3.1
The spider and drum hub are bored for a press fit
onto their respective shafts. The interference is
approximately 0.0005 inch per inch (0.0005 mm/mm)
of shaft diameter.
2.3.2
Ensure the shaft is clean and free of nicks or burrs
and check the shaft and bore diameters for proper
fit dimensions and are also clean and free of nicks
and burrs. Tap the key into the keyway, making sure
it bottoms, and apply a light coat of light weight oil to
the shaft and key.
Table 1
Fastener Description and Assembly Torque - ft.-lb. (Nm)
Description
Specification
SW51TLC1600
SW60TLC1600
SW66TLC1600
SW76TLC1600
SW76TLC2000
ELEM/SPDR/RIM
Size
7/8-9NC-2
1-8NC-2
1 1/4-7NC-2
1 1/4-7NC-2
1 1/4-7NC-2
Quantity
32
36
40
48
48
Torque, Dry
125 (169) "L"
190 (258) "L"
380 (515) "L"
380 (515) "L"
380 (515) "L"
DRUM/HUB
Size
1-8NC-2
1 1/2-6NC-2
1 1/2-6NC-2
1 1/2-6NC-2
1 1/2-6NC-2
Quantity
20
20
30
42
42
Torque, Lubed
510 (691) "L"
650 (881) "L"
650 (881) "L"
650 (881) "L"
650 (881) "L"
SPDR to LCKG Assy.
Size
3/4-10NC-2
3/4-10NC-2
1 1/2-6NC-2
1 1/2-6NC-2
1 1/2-6NC-2
Quantity
2
2
2
4
4
Torque, Lubed
130 (176) "LO"
130 (176) "LO"
325 (441) "LO"
325 (441) "LO"
325 (441) "LO"
HUB to LCKG Assy.
Size
1-8NC-2
1-8NC-2
1-8NC-2
1-8NC-2
1-8NC-2
Quantity
2
2
2
2
2
Torque, Lubed
190 (258) "LO"
190 (258) "LO"
190 (258) "LO"
190 (258) "LO"
190 (258) "LO"
2.3.3
Heat the drum hub or spider uniformly to a maximum
of 250°F (121°C) to expand the bores.
Caution
It is recommended the drum hub or spider be heated
in oil or an oven; however, torches may be used.
Use several with “rosebud” (broad-flame) tips and
keep them moving to avoid "hot spots". Check bore
temperature with a temperature reading device
frequently to avoid overheating.
2.3.4
Slide the heated drum hub or spider onto the shaft.
Hold in position and allow them to cool. It is helpful
to put a mechanical stop device onto the component
face to prevent “over-shooting” the proper axial
location if there is no physical stop on the shaft such
as a machined shoulder.
