Emerson VSSG, VSG manual 8. Gate Rotor Float, 14. Gate Rotor Bearing Float, Maintenance/Service

Section 5 • Maintenance/Service

NOTE

Measurements can be an additional 0.020” higher than float dimensions on Table 5-8. If measurement is an additional 0.030” greater than float dimensions, contact Vilter for further assistance.

Total movement of damper pin in bushing is the

gate rotor float.

4.Using dial indicator, take measurement of gate ro- tor float. Measurement should not exceed values as noted above.

Table 5-8. Gate Rotor Float

Model	Float
	in. (mm)
VSSG 291-601	0.045 (1.143)
VSG 301-401	0.045 (1.143)
VSG 501-701	0.045 (1.143)
VSG 751-901	0.055 (1.397)
VSG 1051-1301	0.060 (1.524)
VSG 1551-2101	0.060 (1.524)
VSG 2401-3001	0.060 (1.524)

NOTE

Some movement between blade and support is necessary to prevent damage to the compressor blade; however at no time should the blade uncover the support.

5.Inspect main rotor and gate rotor for abnormal wear due to dirt or other contaminants. If dam- aged, replace gate rotor and/or main rotor.

GATE ROTOR BEARING FLOAT INSPECTION

6.Using dial indicator, position a dial indicator on the gate rotor, see Figure 5-14.

Side View

Gate rotor bearing float being measured.

Wooden block to prevent damage to gate rotor blade.

Direction of rotor movement.

Axial force at gate rotor to not exceed 100 lbs.

Applied Force

Rigidly attach dial indicator.

Use bolt for fulcurm.

Figure 5-14. Gate Rotor Bearing Float

7.Use a lever arm pivoting on a bolt with a small block of wood against the gate rotor blade to protect the blade.

8.Gently apply pressure to lever and take measure- ment. Maximum amount of gate rotor bearing float should not exceed 0.002” (0.051 mm).

9.Install gate rotor cover.

10.Install center member, see Drive Coupling Replacement procedure.

11.Perform compressor unit leak check, see Compressor Unit Leak Check procedure.

5 – 18 VSG/VSSG • Installation, Operation and Maintenance Manual •Vilter/Emerson • 35391SSG