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How to Install a Rigid Shaft Coupling

Release Date: August 9, 2013

A step by step procedure of how to install a one- and two-piece rigid shaft coupling. Watch the video and follow the instructions below. Please feel free to contact us if you have any questions on proper collar installation. Email: techsupport@ruland.com


Transcript

Hi I’m Mike Langley with Ruland’s Manufacturing’s technical video series. Today I want to show you how to install our one and two-piece rigids couplings. For today, we’ll need our rigid coupling, our PPE, torque wrench, Allen wrenches and your shaft alignment tools.


We will begin with the one-piece rigid coupling. First step in the installation process is to align the shafts that are being connected to remove misalignment. The system needs to be align because rigid couplings will transmit forces generated by misalignment to other components causing them to fail prematurely. Next we will remove the coupling from Its packaging and place it on the shafts. We recommend tightening the clamp screws in two stages. Starting with the inside screws, tighten half of the recommended seating torque. The recommended seating torque on this coupling is 76 in/lbs, so I will tighten to 38 in/lbs. Repeat for the outside screws again tightening to half of the recommended seating torque. Tightening the screws in this pattern distributes the tension more evenly assuring a tighter fit in the desired holding power. Lastly, we will tighten the screws of the full recommended seating torque of 76 in/lbs following the same pattern from the inside to the outside. This concludes the installation of a one-piece rigid coupling.

Next, we will move on to the installation of the two-piece rigid coupling. The two-piece rigid coupling allows for disassembly and maintenance without removal of other components. Align the shaft that are being connected to remove misalignment. The most important feature of a Ruland rigid coupling is that it will not introduce misalignment into the system. Ruland straight bored rigid couplings are precision honed assuring that both bores are co-linear with precise dimensions. Take the coupling out of its packaging and remove all of its screws. The yellow coating on the thread of the screw is a proprietary Nypatch coating. Nypatch hardware provides even seating of the screw installation and prevents culling. Hardware coated with Nypatch also resist loosening from vibration and maintain holding power. Insert the screws and hand tighten. It is important to maintain the gap between the two halves on the two-piece couplings. We recommend tightening the clamp screws in two stages starting with the inside screws, tighten half of the recommended seating torque. The recommended seating torque on this coupling is 76in/lbs, so I will tighten it to 38 in/lbs. Repeat for the outside screws again tightening to half of the recommended seating torque. It is important to maintain the gap between the two halves on the two-piece couplings. Lastly, we will tighten the screws to the full recommended seating torque of 76 in/lbs following the same pattern from the inside to the outside.

For specific installation instructions for your shaft collar or coupling, please visit www.Ruland.com.

Installation Instructions

  1. Align the coupling on the two shafts to be connected.
  2. Tighten the Nypatch® clamp screws in two stages. Starting with the inside screws, tighten to half of the recommended seating torque. Repeat for the outside screws, again tightening to half of the recommended seating torque.
  3. Be sure to maintain the gap between the two halves of the coupling on two-piece styles.
  4. Tighten screws to the full recommended seating torque following the same pattern, beginning with the inside screws first.
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