B) Gaterotor Float Measurement; Table 5-12. Gaterotor Float - Emerson Vilter VSS Installation, Operation & Maintenance Manual

Section 5 • Maintenance/Service
4. If it is easy to pull out the feeler gauge, then increase
the feeler gauge thickness by 0.001" and repeat
above steps 1-3. If it is slightly tight to pull it out,
then the clearance corresponds to the feeler gauge
thickness.
Replacement gaterotors are the same dimensionally as
the gaterotors installed at the factory. Therefore, the
same shims can be reused when replacement is needed
to preserve the 0.003" – 0.004" clearance.
Clearance and Shims
Under 0.003" 0.003" – 0.004"
Remove shims
(103 in Figure
5-48, 106 in
Perfect!
Figure 5-42 &
5-44) to achieve
0.003" – 0.004"

B) Gaterotor Float Measurement

1. Before doing any measurements, first conduct a vi-
sual check to see if there is any noticeable clearance
between the gaterotor and its bushing, see Figure
5-32. If there is noticeable clearance, please contact
Vilter Service Department.
The number of bushings on a gaterotor can be anywhere
from one to three.
2. To measure the float between the gaterotor bush-
ing and the support damper pin (see Figure 5-34),
position a dial indicator at the tip of the support as
shown in Figure 5-33. Hold the gaterotor in place,
then gently move the support teeth back and forth
with two fingers (and record measurement). Refer to
Table 5-12 to find the maximum float value.
NOTICE
If clearance measurements are out of tolerance,
contact Vilter Service Department for further
assistance.
VSS/VSM/VSH/VSSH • Installation, Operation and Maintenance Manual • Emerson • 35391SD
NOTE
Over 0.004"
Add shims (103
in Figure 5-48,
106 in Figure
5-42 & 5-44) to
achieve 0.003"
– 0.004"
NOTE

Table 5-12. Gaterotor Float

Model
VSM-97 - VSM127
VSM 71 - VSM 401
VSM 501 - 701
VSS/VSSH 291 - 601
VSS 751 - 901
VSS/VSH 791 - 1301
VSS 1501 - 2101
VSS 2401-3001
Figure 5-32. Visual Inspection Between
Gaterotor and Bushing
Dial Indicator Gaterotor Blade
Gaterotor
Support
Figure 5-33. Gaterotor Float Dial Location
Float
in. (mm)
0.045 (1.143)
0.045 (1.143)
0.045 (1.143)
0.045 (1.143)
0.055 (1.397)
0.060 (1.524)
0.060 (1.524)
0.060 (1.524)
Damper Pin
and Bushing
Main Rotor
5 – 39