Emerson Vilter VSG128, Installation, Operation And Service Manual

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5 – 9
Section 5 • Maintenance/Service
HPLD Single Screw Compressor • Installation, Operation and Service Manual • Emerson • 35391HP
C) Gaterotor Bearing Inspection
Position a one gallon (at least) plastic oil collection bin
beneath the side cover. Carefully pry open the side cover
to allow the oil to drain before finally re moving the side
cover.
1. To measure the gaterotor radial bearing clearance,
position a dial indicator to the gaterotor shaft as
shown in Figure 5-8 (a) and zero the indicator. Put
a hand as shown and firmly move the shaft in the
direction shown in Figure 5-8 (a). Record the mea-
surement. See table 5-3 for the maximum radial
clearance value.
2. To measure the gaterotor axial bearing clearance,
position a dial indicator on the gaterotor, as shown
in Figure 5-8 (b).
3. To check axial bearing clearance use a lever arm piv-
oting on a bolt with a small block of wood against
the gaterotor to protect it, as shown in Figure 5-8
(b). Record the measurement. See table 5-3 for the
maximum axial clearance value.
Models
VSG, VSH, VSS
Max. Axial
Clearance
in (mm)
Max. Radial
Clearance
in (mm)
128, 145, 160,
180, 204, 222,
243
0.002”
(0.051 mm)
0.004”
(0.102 mm)
Table 5-3. Maximum Gaterotor Bearing
Clearance
Figure 5-8. Gaterotor Bearing Clearance
Force to be determined
by length of lever arm.
Use bolt for fulcrum.
Rigidly attach
dial indicator.
Side View
Wooden block to prevent
damage to gaterotor blade.
Showing gaterotor bearing clearance
being measured.
Direction of gaterotor movement.
Axial force at gaterotor to not
exceed 100 lbs.
Figure 5-8 (a): Radial
Figure 5-8 (b): Axial