Emerson VSG, VSSG manual Drive Coupling Type C Sure-Flex Replacement, Maintenance/Service

Section 5 • Maintenance/Service

32.Perform hot alignment. Run compressor unit and allow to warm up completely.

33.Power down compressor unit and re-check align- ments. Loosen motor mounting nuts to add shims or to adjust alignments as required.

34.Install coupling guard.

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

Drive Coupling (Form-Flex BPU) Center Member and Hub 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 lockout/tagout procedure. Failure to comply may result in serious injury, death and/or damage to equipment.

NOTE

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.

alignment.

NOTE

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 lockout/tagout procedure. 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.

NOTE

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.

9.Remove hub and key from motor shaft.

10.Loosen set screw in compressor hub securing key in keyway.

11.Loosen clamping bolts securing hub from

VSG/VSSG • Installation, Operation and Maintenance Manual •Vilter/Emerson • 35391SSG 5 – 13