Emerson VSR, VSM Service, Discharge Manifold Installation, Slide Valve Gear And Rack Inspection

Service

DISCHARGE MANIFOLD INSTALLATION

A)Install (2) guide rods to position the discharge manifold. Install a new manifold gasket and the discharge manifold. Install the dowel pins and bolts, tighten manifold bolts to the recom- mended torque value.

B)On VSS 451-3001 compressors install the dis- charge spool or elbow between the discharge manifold and oil separator with new gaskets. When installing the discharge elbow tighten the bolts to the correct torque on the manifold flange first before tightening the separator flange bolts. Install the drain plug in the bottom of the discharge manifold.

C)On VSM 301-701 compressors install the bolts in the discharge flange. Install the drain plug in the bottom of the discharge manifold.

D)Install both command shaft assemblies and control actuators.

SLIDE VALVE GEAR AND RACK INSPECTION

A)Remove the discharge manifold.

B)Check rack to rack clamp and rack clamp spacer clearance on all four slide valves.

TABLE 4.1

RACK CLEARANCE VALUES

MEASUREMENT	CLEARANCE
Rack to clamp.	0.005 to 0.010”
Rack to clamp spacer.	0.003 to 0.005”

C)Check torque of socket heat cap screws.

D)Check for excessive movement between the slide valve rack shafts and the rack. The jam nuts on the end of the slide valve rack shaft should be tight.

E)Check for loose or broken roll pins in gears.

F)Look for any excessive wear on all moving parts and replace the worn parts.

G)Reassemble the manifold and discharge elbow.

REMOVAL OF CAPACITY OR VOLUME CROSS SHAFTS

A)Remove the discharge manifold.

B)To remove the capacity or volume ratio slide valve racks, remove the two jam nuts and lock washers (361) securing the rack (316) to the slide valve shafts. The racks can now be pulled off the slide valve shafts. Repeat the procedure for the remaining pair of slide valve racks.

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