How to Install a Grid Coupling

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grid coupling
how to install
how to install a grid coupling
Grid couplings, like disc and gear couplings, are designed with high torque density applications in mind. Typically composed of two shaft hubs, a horizontally split cover kit and a serpentined grid, grid couplings are well suited for shock loading applications. Torque is transmitted between the two shaft hubs through the grid element, and the shock absorbing grid dissipates shock loading applications, minimizing the on the connected equipment. With proper installation, maintenance and lubrication, you can deliver years of reliable service for your operation.

1) Safety and inspection

Before starting, please make sure to wear the proper personal protective equipment (PPE) and be certain lock-out tag-out (LOTO) procedures are followed on stationary equipment to assure the system is safely isolated from all sources of potential energy. Inspect both the driving and the driven shaft to make sure they are free of dirt and burrs. Clean and de-burr as necessary.
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2) Grease the seals

Lightly coat the seals with grease and fit them over the shafts before mounting the hubs.
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3) Install keys in shaft and mount the hubs

Install properly fitted keys into the shaft and mount the hubs on the shafts with their flange face flush with the shaft. Tighten the setscrews. If the hubs are interference fit, heat hubs to 275°F. Interference fit hubs generally do not have setscrews, but where used, be sure hubs are cool before tightening setscrews to avoid fracturing or damaging the hubs.
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4) Set the gap between the hubs

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Use a spacer bar that is equal in thickness of the hub gap specified in your manufacturer’s installation manual. Insert the spacer bar at the same depth at 90 degree intervals to ensure the gap is equal all the way around. The difference in minimum and maximum measurements must not exceed the angular installation limits specified in your installation manual. Maximum life and low maintenance for the coupling and connected equipment is achieved with accurate alignment. 

5) Check the offset misalignment

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Align the hubs so that a straight edge can rest squarely on both hubs at 90 degree intervals. Ensure clearance does not exceed the parallel offset installation limit specified in your installation manual. Adjust or shim as needed until the hubs meet acceptable measurements. For superior final alignment, the use of laser or dial indicator alignment systems is recommended. 

6) Install the grid

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First pack the gap and grooves with specified lubricant. Spread the grid slightly to pass over the coupling teeth and seat the grid in the slots. Pack the spaces around the grid with as much lubricant as possible, and wipe off the excess grease, flush with the top of the grid.

7) Assemble the covers

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Position the seals on the hub to line up with the grooves on the cover. Position the gaskets on the flange of the lower cover half, and assemble the covers so that the match marks are on the same side. Push the gaskets in until the covers stop against the seals. Connect the cover halves with fasteners. Tighten the fasteners to the torque ratings specified in your installation manual.

For more information on Rexnord Couplings such as installation manuals, videos and product specifications, click here.

Bill Holtz

Bill is a Senior Engineering Manager for Coupling at Rexnord. He has 29 years of experience in the coupling industry with a greater depth of knowledge in disc, elastomeric and fluid coupling designs and applications. Bill has served as a presenter at numerous industry organization events.