Emerson VSS, VSR, VSM service manual Coupling Installation, Coupling Information

Coupling Installation

COUPLING INFORMATION

COUPLINGS INSTALLATION AND ALIGNMENT

These instructions are intended to help you to install and align the coupling. Covered here will be general information, hub mounting, alignment, assembly, locknut torquing, discpack replacement, and part numbers. The coupling as received, may or may not be assembled.

*If assembled, the locknuts are not torqued.

*If coupling is assembled, remove the bolts that at- tach the hubs to the disc packs. Remove both hubs. Leave the disc packs attached to the center member.

A. Hub Mounting:

1.Clean hub bores and shafts. Remove any nicks or burrs. If bore is tapered, check for good contact pattern. If the bore is straight, measure the bore and shaft diameters to assure proper fit. The key(s) should have a snug side-to-side fit with a small clearance over the top.

NOTE: If the hub position on the shaft does not allow enough room to install the short bolts in the hub after hub mounting, install the bolts and disc pack before mounting hub on shaft.

B. Straight Bore:

1.Install key(s) in the shaft. If the hub is an interfer- ence fit, heat the hub in an oil bath or oven until bore is sufficiently larger than the shaft. 350º F. is usually sufficient. An open flame is not recom- mended. However, if flame heating is necessary, use a very large rose bud tip to give even heat distribution. A thermal heat stick will help deter- mine hub temperature. DO NOT SPOT HEAT THE HUB OR DISTORTION MAY OCCUR. With the hubs expanded, slide it up the shaft to the desired axial position. A pre-set axial stop device can be helpful.

C.Taper Bore:

1.Put the hub on the shaft without key(s) in place. Lightly tap hub up the shaft with a soft hammer. This will assure a metal-to-metal fit between shaft and hub. This is the starting point for the axial draw. Record this position between shaft and hub face with a depth micrometer. Mount a dial indica- tor to read axial hub movement. Set the indicator to “0”. Remove hub and install key(s). Remount hub, drawing it up the shaft to the “0” set point. Continue to advance hub up the taper to the de- sired axial position. Use the indicator as a guide only. A pre-set axial stop device can be helpful. Check the final results with a depth micrometer. The hub may have to be heated in order to reach the desired position on the shaft. DO NOT SPOT HEAT THE HUB OR DISTORTION MAY OCCUR. Install shaft locknut to hold hub in place.

D.Shaft Alignment.

Move equipment into place.

1.Soft Foot. The equipment must sit flat on its base (+/- 0.002 inches). Any soft foot must be corrected now.

2.Axial Spacing. The axial spacing of the shafts should be positioned so that the disc packs (flex- ing elements) are flat when the equipment is running under normal operating conditions. This means there is a minimal amount of waviness in the disc pack when viewed from the side. This

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