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Section 5 • Maintenance/Service
Drive Coupling Hub (Form-Flex BPU)
and Center Member Removal
To remove coupling assembly, proceed with the follow-
ing steps:
WARNING
At shutdown, open any other valves that may trap
liquids to prevent serious injury and/or damage to
equipment.
WARNING
Follow local lock-out/tag-out procedure. Compressors
must be depressurized before attempting to do any
work on them. Failure to comply may result in serious
injury, death and/or damage to equipment.
Drive coupling type and size can be determined
by the information on the compressor nameplate
when ordering; Order Number and Compressor
Model Number.
1.
Shut down the compressor unit, refer to Stopping/
Restarting procedure in Section 4.
2.
Turn disconnect switches to the OFF position for
the compressor unit and oil pump motor starter, if
equipped.
3.
Allow compressor, motor and surrounding compo-
nents to cool prior to servicing.
4.
Remove coupling guard.
5.
Remove lock nuts and bolts securing disc pack to
hub on compressor shaft.
6.
If additional room is required to remove the center
member, loosen clamping bolts on straight bore
hub(s).
7.
Move straight bore hub on shaft as required to al-
low center member removal.
8.
Remove lock nuts and bolts securing disc pack to
hub on motor shaft. Remove center member.
9.
For straight bore hubs, remove clamping bolts and
hub from shaft.
10. For tapered bore hubs, remove bolt, lock washers,
large washer and hub from shaft.
VSS/VSM/VSH/VSSH • Installation, Operation and Maintenance Manual • Emerson • 35391SD
NOTE
Drive Coupling (Type C Sure-Flex)
Replacement
Drive couplings that are the Type C Sure-Flex type, are
always installed with a C-flange between the compres-
sor and motor. The coupling assembly alignments are
built into the design and therefore, should not require
alignment.
Drive coupling type and size can be determined
by the information on the compressor nameplate
when ordering; Order Number and Compressor
Model Number.
Removal
To remove Type C Sure-Flex coupling, proceed with the
following steps:
WARNING
At shutdown, open any other valves that may trap
liquids to prevent serious injury and/or damage to
equipment.
WARNING
Follow local lock-out/tag-out procedure. Compressors
must be depressurized before attempting to do any
work on them. Failure to comply may result in serious
injury, death and/or damage to equipment.
1.
Shut down the compressor unit, refer to Stopping/
Restarting procedure in Section 4.
2.
Turn disconnect switches to the OFF position for
the compressor unit and oil pump motor starter, if
equipped.
3.
Allow compressor, motor and surrounding compo-
nents to cool prior to servicing.
4.
Remove C-flange access cover.
Mark locations of hubs prior to removal.
5.
Loosen set screw in motor hub securing key in
keyway.
6.
Loosen clamping bolts securing hub to motor shaft.
7.
Pry hub up motor shaft for space to remove cou-
pling sleeve.
8.
Remove coupling sleeve from hub.
NOTE
NOTE
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Troubleshooting
