Type G rotary unions are high-precision components that provide smooth running operation at high speeds. Due to the precise manufacturing tolerances, these unions require care during installation and maintenance. Download the installation instructions.

Flexible Hose

To ensure free movement of the union and elimination of side loading, the proper installation, type and length of flexible hose should be used. Johnson recommends SAE 100R1 Type AT single-braid hose. The minimum length of hose is 12" for a one-piece installation.

It is important to connect the hose to the union prior to installation of the union onto the spindle. Damage can occur to the ball bearing races in the union if the hose is attached to a union mounted on a spindle.

Lubrication

The seal faces in all Type G rotary unions are lubricated by the media (coolant, hydraulic oil, etc.) passing through the union. The Auto-Off™ seal device found in the GX, GZ, and G5050 unions permits dry running. All ball bearings are lubricated for life and require no additional lubrication.

Filtration

It is important to follow the filtration requirements recommended by the machinery OEM. Johnson-Fluiten unions do not require additional filtration other than what is recommended for the coolant pumping system.

Guarantee

Type G unions are tested prior to shipment and are warranted against manufacturing defects for 12 months. Johnson's global sales and service network stands behind its products and provides support to more than 150 countries worldwide.