C) Gaterotor Backlash Inspection - Emerson Vilter VSS Installation, Operation & Maintenance Manual

Section 5 • Maintenance/Service

C) Gaterotor Backlash Inspection

Gaterotor Backlash is the clearance between the gatero-
tor teeth width and the main rotor groove.
Follow these steps to perform the gaterotor backlash
inspection:
1. The Gaterotor should be aligned so that a tooth in
the rotor is perpendicular to the Main Axis as shown
in Figure 5-35. The tooth should be in the center
axis of the housing.
2. A dial indicator with magnetic base can be used
(Vilter part numbers 9994ARE or 9994ARJ for
the dial indicator, and 9994ARD for the magnetic
base). See Figure 5-36 for location.
Gaterotor Support
Gaterotor
Shelf
5 – 40
Figure 5-34. Gaterotor Float
Figure 5-36. Location of Dial Indicator Magnetic Base
VSS/VSM/VSH/VSSH • Installation, Operation and Maintenance Manual • Emerson • 35391SD
Inside Tooth is Perpendicular to the Rotor
Figure 5-35. Alignment of Gaterotor
Location for Dial Indicator
Magnetic Base