Gaterotor Bearing Inspection; Table 5-11. Maximum Gaterotor Bearing Clearance - Emerson Vilter VSS Installation, Operation & Maintenance Manual

Section 5 • Maintenance/Service

Gaterotor Bearing Inspection

1. Position a one gallon (at least) plastic oil collec-
tion bin beneath the side cover. Carefully pry
open the side cover to allow the oil to drain before
finally re moving the side cover.
2. To measure the gaterotor radial bearing clear-
ance, position a dial indicator to the gaterotor
shaft as shown in Figure 5-29 (a) and zero the
indicator. Put a hand as shown and firmly move
the shaft in the direction shown in Figure 5-29
(a). Record the measurement. See table 5-11 for
the maximum radial clearance value.
3. To measure the gaterotor axial bearing clear-
ance, position a dial indicator on the gaterotor,
as shown in Figure 5-29 (b).
Figure 5-29 (a): Radial
VSS/VSM/VSH/VSSH • Installation, Operation and Maintenance Manual • Emerson • 35391SD
Figure 5-29. Gaterotor Bearing Clearance
4. To check axial bearing clearance use a lever arm
pivoting on a bolt with a small block of wood
against the gaterotor to protect it, as shown in
Figure 5-29 (b). Record the measurement. See
table 5-11 for the maximum axial clearance value.
Table 5-11. Maximum Gaterotor
Bearing Clearance
Max. Axial
Compressor
Clearance
Models
in (mm)
0.002"
All Sizes
(0.051 mm)
Figure 5-29 (b): Axial
Side V iew
Showing gaterotor bearing clearance
being measured.
Direction of gaterotor movement.
Axial force at gaterotor to not
exceed 100 lbs.
Rigidly at tach
dial indicator.
Use bolt for fulcrum.
Max. Radial
Clearance
in (mm)
0.004"
(0.102 mm)
Wooden block to prevent
damage to gaterotor blade.
Force to be determined
by length of lever arm.
5 – 37