Emerson VSS, VSR, VSM Service, D Set the clearance between the gate rotor blade and the shelf

Service

D)Set the clearance between the gate rotor blade and the shelf.

1.Place a piece of 0.003”-0.004” shim stock between the gate rotor blade and the shelf.

2.Measure the depth from the top of the com- pressor case to the top of the thrust bearing housing. This determines the amount of shims needed for the correct clearance.

3.Use factory installed shim pack (106) and bearing housing cover (116) without the O- ring (143). Check the clearance between the entire gate rotor blade and the shelf, rotate the gate rotor to find the tightest spot. It should be between 0.003”-0.004”. Make adjustments, if necessary. It is preferable to shim the gate rotor blade looser rather than tighter against the shelf.

Note: Replacement blades are precisely the same dimensionally as blades installed originally at fac- tory: Therefore, the same amount of shims will be required for replacement blades.

E)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.

F)Install side cover with a new gasket. Tighten the bolts to the recommended torque value. The unit can then be evacuated and leak checked as outlined in section 0.03.

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