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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 set screws (M12 size) and tighten to 29.5 lb-ft (40
N-m) of torque. Reinstall coupling guard with provided fasteners.
4. For hub-to-shaft interference fit hubs, air end relocation is necessary:
Remove coupling guard by removing fasteners
Remove the following various lines and components on the compressor. Make sure to identify
each to ease re-assembly – you may also refer to Parts List 13-18-506 for more details:
o
Inlet valve assembly and common duct with the air filter box.
Blowdown hose between oil sump and "Tee" fitting at compressor inlet.
o
Blowdown hose between air filter box and "Tee" fitting at compressor inlet.
o
Auxiliary check valve between "Tee" fitting and compressor inlet.
o
Raise jackscrew provided on base frame to contact adaptor housing flange bottom (motor side)
See Fig 8-3 for details.
Figure 8-2 – COUPLING ELEMENT
Figure 8-3 – JACKSCREW DETAIL AT BASE FRAME
13-18-614
Page 54
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