Emerson Vilter VSS Installation, Operation & Maintenance Manual page 119

Section 5 • Maintenance/Service
Figure 5-42. Gaterotor Assembly and Tools
VSS/VSM/VSH/VSSH • Installation, Operation and Maintenance Manual • Emerson • 35391SD
23. Check the clearance between the entire gaterotor
blade and the shelf, rotate the gaterotor to find the
tightest spot. It should be between 0.003-0.004"
(0.076-0.102 mm). Make adjustments, if neces-
sary. It is preferable to shim the gaterotor blade
looser rather than tighter against the shelf, see
Figure 5-43.
24. After clearance has been set install a new O-ring
(143) on bearing housing cover, install cover and
tighten the bolts to the recommended torque
value.
25. Install side cover with a new gasket. Tighten the
bolts to the recommended torque value. The unit
can then be evacuated and leak checked.
Check for 0.003-0.004" (0.076- 0.102 mm) clearance between
gaterotor blade and partition.
Figure 5-43. Gaterotor and Shelf Clearance
5 – 45