Field Repair Instructions for Teflon Sealed Unions

When installed and used properly, your Rotary Systems rotary union will provide a long, leak free life.  If necessary, your union can be serviced in the field using these simple instructions:

Disassembly

1. Remove snap ring from back of union.
2. Support housing and press shaft through housing with a hydraulic press.
3. Ensure that the shaft is supported as it is pressed out of the housing.
4. Do not damage seal surfaces!
5. If replacing bearings, use a split ring puller to remove the large bearing from the shaft and remove the small bearing from the back of the housing.
6. Do not scratch ID grooves of housing.
7. Remove Teflon seals with an o-ring pick from housing.
8. Remove o-ring backer from seal glands in housing.
9. Degrease the housing and clean the seal glands with a Q-tip soaked in alcohol.
10. Clean shaft and examine seal area for damage.
11. The seal surface should be free of burrs, or nicks, or wear grooves.  If in doubt, contact Rotary Systems.

Assembly

1. Install o-rings in seal gland of housing.
2. Install Teflon seal over O-ring, seal to be concentric with bore of housing after installed.
3. Lightly lubricate Teflon seals after installation with hydraulic fluid.
4. If replacing bearings, install large and small bearing into housing.  
5. Lightly lubricate shaft with hydraulic fluid.
6. Carefully press shaft into housing by hand to ensure that new seals don’t get damaged.
7. Insert union with small bearing down into hydraulic press.
8. Make sure that inner race of bearing is supported.
9. Use hydraulic press to press the shaft the rest of the way into the housing.
10. Install snap ring.
11. Recommend turning the union at 100 RPM for approx. 10 minutes without media to seat the new seals to the shaft.
12. Continue to rotate until a rise in temperature is observed. Do not exceed 100 degree F.
13. Test ports for air leakage @ 80 PSI using a soap/water solution.
14. Repeat step (11) if union leakage is unacceptable.