- How to Buy
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:
- Remove snap ring from back of union.
- Support housing and press shaft through housing with a hydraulic press.
- Ensure that the shaft is supported as it is pressed out of the housing.
- Do not damage seal surfaces!
- 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.
- Do not scratch ID grooves of housing.
- Remove Teflon seals with an o-ring pick from housing.
- Remove o-ring backer from seal glands in housing.
- Degrease the housing and clean the seal glands with a Q-tip soaked in alcohol.
- Clean shaft and examine seal area for damage.
- The seal surface should be free of burrs, or nicks, or wear grooves. If in doubt, contact Rotary Systems.
- Install o-rings in seal gland of housing.
- Install Teflon seal over O-ring, seal to be concentric with bore of housing after installed.
- Lightly lubricate Teflon seals after installation with hydraulic fluid.
- If replacing bearings, install large and small bearing into housing.
- Lightly lubricate shaft with hydraulic fluid.
- Carefully press shaft into housing by hand to ensure that new seals don’t get damaged.
- Insert union with small bearing down into hydraulic press.
- Make sure that inner race of bearing is supported.
- Use hydraulic press to press the shaft the rest of the way into the housing.
- Install snap ring.
- Recommend turning the union at 100 RPM for approx. 10 minutes without media to seat the new seals to the shaft.
- Continue to rotate until a rise in temperature is observed. Do not exceed 100 degree F.
- Test ports for air leakage @ 80 PSI using a soap/water solution.
- Repeat step (11) if union leakage is unacceptable.