Table 5-5. Backlash Range; Figure 5-16. Placement Of Dial Indicator; Figure 5-17. Measuring Backlash - Emerson Vilter VSG128 Installation, Operation And Service Manual

Section 5 • Maintenance/Service
3. Place the Dial Indicator as square as possible on the
Gaterotor tooth as shown on Figure 5-16.
4. To measure the backlash (see Figure 5-17),
move the gaterotor with two fingers back and
forth rapidly several times while reading the dial
indicator to see what the displacement range is.
This displacement range will be the total backlash.
Contact Vilter Service Department if the measurement
is above the ranges shown on Table 5-5.
Displacement
Range
HPLD Single Screw Compressor • Installation, Operation and Service Manual • Emerson • 35391HP
Dial Indicator

Figure 5-16. Placement of Dial Indicator

Figure 5-17. Measuring Backlash

Table 5-5. Backlash Range

Models
VSG, VSH, VSS
128, 145, 160, 180, 204,
222, 243
Fingers Positioning to Move the Gaterotor Back
and Forth
Backlash
in (mm)
Up to 0.012"
(Up to 0.305 mm)
5 – 13