Section 5 • Maintenance/Service
Gate Rotor Assembly Replacement (VSG 301-701 Compressors ONLY)
REMOVAL
The removal of the gate rotor assembly for the VSG 301- 701 compressors is similar for the VSG 901- 2101 com- pressors except that the inner races are secured to the stationary bearing spindle.
1.Remove center member, see appropriate Drive Coupling Replacement procedure.
2.Remove the upper bolt from the side cover and in- stall a guide stud in the hole.
3.Remove remaining bolts and side cover. There will be some oil drainage when the cover is removed.
4.The side cover that contains the suction strainer should have the suction line properly supported before the bolts securing the line to the cover can be removed. After the line is removed, the cover can be removed per paragraph B.
5.Turn the main rotor so the driving edge of the groove is between the top of the shelf or slightly below the back of the gate rotor support. At this point install the gate rotor stabilizing tool.
6.Remove plug on the thrust bearing housing. Loosen the socket head cap screw that is located under- neath the plug. This secures the inner races of the thrust bearings to the spindle.
7.Remove bolts that hold the thrust bearing housing to the compressor. Insert two of the bolts into the threaded jacking holes to assist in removing the bearing housing from the compressor. When the housing is removed, there will be shims between the spindle and thrust bearings. These control the clearance between the shelf and gate rotor blades. These must be kept with their respective parts for that side of the compressor.
8.Remove the bolts from the roller bearing housing. After the bolts have been removed, the housing can be removed from the compressor.
9.To remove the gate rotor support, carefully move the support opposite the direction of rotation and tilt the 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 versions, repeat the procedure for the remaining gate rotor support assembly.
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.
11.Install the roller bearing housing with a new
12.Install the spindle with shims and
13.Check the clearance between the entire gate ro- tor blade and the shelf, rotate the gate rotor to find the tightest spot. It should be between 0.003- 0.004“
INSTALLATION
10. Install the gate rotor support. Carefully tilt the roller
Figure 5-21. Gate Rotor Assembly Breakdown
5 – 24 | VSG/VSSG • Installation, Operation and Maintenance Manual •Vilter/Emerson • 35391SSG |
