Emerson Gate Rotor Assembly Replacement All VSG & VSSG Compressors Except, Maintenance/Service

Section 5 • Maintenance/Service

Gate Rotor Assembly Replacement

(All VSG & VSSG Compressors Except

VSG 301-701 Compressors)

the shim pack.

9.Hold gate rotor support with a suitable wrench on the flats provided near the roller bearing housing.

10.Remove the inner retainer bolts and retainer.

The following table lists the gate rotor tool sets needed to remove and install gate rotor assemblies.

Table 5-9. Gate Rotor Tool Sets

Model	Tool Set VPN
VSSG 291-601	A25205B
VSG 301-401	N/A
VSG 501-701	A25205B
VSG 751-1301	A2520 5C
VSG 1551-2101	A25205E
VSG 2401-3001	A25205F

REMOVAL

1.Remove center member, see appropriate Drive Coupling Replacement procedure.

NOTE

All parts must be kept with their appropriate side and not mixed when the compressor is reassembled.

2.Remove two upper bolts from side cover

3.Install guide studs in holes.

NOTE

There will be some oil drainage when the cover is

removed.

4.Remove remaining bolts and side cover.

5.Turn main rotor so a driving edge of any one of the main rotor grooves is even with the back of the gate rotor support.

NOTE

The gate rotor stabilizer is designed to hold the gate rotor support in place and prevent damage to the gate rotor blade as the thrust bearings and housing is being removed.

6.Insert gate rotor stabilizer. The side rails are not re- quired on VSSG 291 thru 601. For the VSG 751 thru 901 and VSG 1051 thru 1301 compressors, use the side rails and assemble to the gate rotor stabilizer as stamped. For the VSG 1551 thru 2101, use the side rails and assemble to the gate rotor stabilizer.

7.Remove hex head bolts and socket head bolts from thrust bearing cover.

8.Re-install two bolts into the threaded jacking holes to assist in removing thrust bearing cover. Retain

11.To remove the thrust bearing housing, install thrust bearing removal and installation tool with smaller puller shoe. Turn the jacking screw clockwise. The thrust bearings and housing assembly will be pulled off the shaft and out of the frame.

12.Remove bolts from roller bearing housing.

13.Re-install two bolts into jack bolt holes provided in housing to aid in removal.

14.To remove the gate rotor support, carefully move support in the opposite direction of rotation and tilt roller bearing end towards the suction end of the compressor. The compressor input shaft may have to be turned to facilitate the removal of the gate rotor support. On dual gate compressor units, repeat the procedure for the remaining gate rotor support assembly.

INSTALLATION

15.Install gate rotor support by carefully tilting the roller bearing end of the gate rotor support towards the suction end of the compressor. The compressor input shaft may have to be rotated to facilitate the installation of the gate rotor support. Install gate rotor stabilizer. The gate rotor stabilizer (901) will hold the gate rotor support in place as the thrust bearing housing is being installed. If the gate rotor support is not restricted from moving, the gate ro- tor blade may be damaged.

16.Install the roller bearing housing (112) with a new O-ring (141).

17.Tighten bolts (152), see Appendix A.

18.When installing the thrust bearing housing (113), a new O-ring (142) must be used when the housing is installed, see Figure 5-19. Lubricate the outside of the housing and bearings with clean compres- sor oil to aid in the installation. Due to the fit of the bearings on the gate rotor shaft, the thrust bearing removal and installation tool with the pusher shoe must be used. Turn the jacking screw clockwise. This will push the thrust bearings onto the shaft and push the housing assembly into the frame. Install the inner retainer (115) and bolts (151) us- ing Loctite® 242 thread locker. Tighten bolts, see Appendix A.

19.Set clearance between gate rotor blade and shelf.

20.Place a piece of 0.003”-0.004” shim stock between gate rotor blade and shelf.

VSG/VSSG • Installation, Operation and Maintenance Manual •Vilter/Emerson • 35391SSG 5 – 21