13-18-601 Page 57
• Slide/Pull main motor (24) away from adaptor (16) until coupling hubs separate and allow
removal of spider.
• Inspect coupling element for signs of wear and tear such as indentations, cracks, deformation,
extrusions, etc. Replace, if necessary.
• Re-assemble main motor and cooling fan components in reverse.
• After engaging each hub on the matching recesses of the coupling element, check that the gap
between the hub flats (see dimension “E” on Figure 8-2) is no less than 1.1 in (28mm). A
smaller gap will produce abnormal wear of the element by friction and excessive thermal
expansion – the latter could cause compressor damage by axially displacing the input shaft.
Make sure that keys are in proper alignment with key-ways on hubs.
• Apply a thread-locking compound to the hub setscrews (M8 size) and tighten to 88.5 lb-in (10 N-
m) of torque. Reinstall coupling guard with provided fasteners.
N
N
N
O
O
O
T
T
T
I
I
I
C
C
C
E
E
E
Coupling hubs are designed to fit on compressor and motor shafts
with a transitional interference. If a coupling hub is interference
fitted over the companion shaft, it must be removed (and installed)
by using heat (200°F above ambient temperature) to dilate and
create a temporary clearance.
Before removing any interference fitted hub, note and record the
position of the hub with relation to the end of the companion shaft.
The hub must be re-installed at same relative position, in order to
provide the proper clearance for the coupling.
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