Emerson VSG, VSSG manual Command Shaft Assembly Replacement, Command Shaft Seal Replacement

Section 5 • Maintenance/Service

Command Shaft Assembly

Replacement

REMOVAL

NOTE

The following steps can be used to remove or install either the capacity or volume command shaft assemblies.

1.Shut down and isolate compressor unit, see Compressor Unit Shutdown and Isolation procedure.

2.Remove actuator, see Actuator Assembly Replacement procedure.

3.Remove four socket head cap screws (457) and Nord-Lock washers (477) securing mounting plate (415) to manifold.

4.The command shaft and mounting plate may now be removed from the compressor.

INSTALLATION

5.Install the command shaft assembly with a new O-ring (446) on the manifold. Make sure that the command shaft tongue is engaged in the cross shaft slot. Rotate the bearing housing so the vent holes point down, this will prevent water and dust from entering the vents.

6.Install the actuator mounting plate with the four socket head cap screws and Nord-Lock washers se- curing it with proper torque.

7.Perform leak check, see Compressor Unit Leak Check procedure.

Command Shaft Seal Replacement

REMOVAL

1.Remove bolts (281) holding the shaft seal cover (218). Insert two of the bolts into the threaded jacking holes to assist in removing the cover. There will be a small amount of oil drainage as the cover is removed.

2.Remove the rotating portion of the shaft seal (219C).

3.Remove oil seal (230) from cover.

4.Remove the stationary portion of the shaft seal (219B) from the seal cover using a brass drift and hammer to tap it out from the back side of the seal

cover.

5.Seal with stationary carbon face (219B) and rotat- ing mirror face (219C).

Figure 5-29. Command Shaft Seal

INSTALLATION

CAUTION

Care must be taken when handling the shaft seal and mirror face so it is not damaged. Do not touch the carbon or mirror face as body oil and sweat will cause the mirror face to corrode.

NOTE

When replacing the stationary members of the seal on the VSSG 291 thru VSSG 601 the roll pin in the cover is used only with the seal assembly having a stationary mirror face. If a seal assembly with a stationary carbon face is installed, the roll pin must

be removed.

6.To install the carbon cartridge part of the seal in the seal cover; clean the seal cover, remove protective plastic from the carbon cartridge, do not wipe or touch the carbon face. Lubricate the sealing O-ring with clean compressor lubricating oil. If applicable, align the hole on the back of the carbon cartridge with the dowel pin in the seal cover. Install car- tridge using seal installation tool or similar (see tool lists).

7.Wipe clean, the compressor input shaft and the

VSG/VSSG • Installation, Operation and Maintenance Manual •Vilter/Emerson • 35391SSG 5 – 29