Ask Hytrol: How to Change the O-Rings on a ProSort SC

Welcome to Ask Hytrol. Today we are going to demonstrate how to change the o-ring on a ProSort SC.

You will need the following tools:

  • 3/8-inch torque wrench
  • long screwdriver or prybar
  • 3/8-inch socket
  • 9/16-inch socket
  • 3/8-inch impact or ratchet
  • 3/8-inch drive
  • 15/16-inch socket
  • 1/8-inch T-handle or Allen key
  • 11/16-inch wrench
  • 3/8-inch Allen key

For your safety and others around you always perform lockout tag-out procedures on all machinery before removing any guarding for repair. Take a long screwdriver or prybar to roll the divert o-ring off the sheaves. Remove all necessary rollers to gain access to the inside of the diverter.

Now, remove the jam nuts that hold the pivot assembly down to the adjustment block screws. Also, you will need to remove the bolt going through the eye bolt on the air cylinder that mounts the cylinder to the pivot arm. You will need to lift the pivot assembly up from the divert assembly at an angle so that the o-rings stay on the pulley below, but not on the pivot assembly.

Next, you loosen off the bearings setscrews on the side of the divert opposite of the guard so that the bearing mounting plate can be removed with the bearings still on. You now have access to the o-rings where they can be pulled out and replaced with new ones.

To re-assemble, make sure that your new o-rings are around the pulley and the correct quantity is on the pulley as well. Next, put the bearing mounting plate back on and tighten the setscrews. Make sure to properly torque screws back down to 73 inch-pounds (73 in. lbs.). Re-install the pivot assembly up top and reset your adjustment using the jam nuts previously removed.

The o-rings that contact the product on the sheaves of the pivot assembly should sit approximately 1/8 inch above the top of the belt to allow product to divert properly. It is best to do this one bank of divert at a time to have a reference to look at. Insert any rollers you removed and roll the drive o-rings of the sheaves back into place.

You have now successfully changed the o-rings on a ProSort SC and your machine is ready to return to service.

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