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Section 5 • Maintenance/Service
VSS/VSM/VSH/VSSH • Installation, Operation and Maintenance Manual • Emerson • 35391SD
Prior to Shaft Seal Installation
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.
NOTE
Care must be taken when handling the cup assembly
and mating ring when installing. See Figure 5-59 for
Handling Seal Face with Care.
Suggestion
A spray bottle lled with clean compressor oil may be
used to lubricate the faces of the seals without touching
the seal.
Follow these steps to verify the integrity of a shaft seal:
1. Check lead chamfer and outer diameter of shaft for
deep scratches that may potentially damage the
O-ring on the inner diameter of the shaft seal, see
Figure 5-64:
Figure 5-65. Shaft Seal Housing
Figure 5-64. Shaft with Pin
Drive Pin on Shaft
Lead Chamfer on Outer
Diameter of Shaft
Shoulder to
Which Seal Will
Bottom on
Figure 5-66. The Alignment of Compressor
Shaft and Mating Ring
Shoulder on
Compressor Shaft
Align slot in mating
ring (219C) with drive
pin on compressor
shaft
219C
O-ring
2. Check lead chamfer and inner diameter of shaft
seal housing for burrs and/or deep scratches that
may potentially damage the O-ring on the outer
diameter of the shaft seal, see Figure 5-65.
3. Clean compressor shaft and shaft seal cavity in
compressor housing.
4. Apply clean compressor lubricating oil to the
compressor shaft in mating ring seating area, see
Figure 5-66.
Notch in shaft
seal for alignment
with drive pin on
the shaft
Shaft Seal See
Table 5-16
Anti-rotation
pin
Back wall of housing to
which shaft seal/shim
will bottom on
Lead chamfer on
inner diameter of
housing
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