LR500 Series

Oil Level Regulators for Lubricators

The LR500 Series Level Regulators automatically add oil to a lubricator to maintain the factory-recommended level. This function eliminates the work time necessary for manual checks and refills.

  • Unique anti-clog thumb-valve
  • Regulate oil flow from reservoir to keep lubricator full
  • Low-level shutdown switch
  • Reduce engine and pump repairs caused by low lube level
  • Overview
  • Specifications
  • Diagrams
  • Literature

Each LR500 model has a low-level shut-down switch to protect equipment when oil supply is lost. If the lubricator oil level drops below the minimum operations level, the low-level switch will operate an alarm and/or shut down the equipment.

Model LR579 is for Lincoln lubricators. It features an adjustable low-level shut-down contact.

LR589 is for Lincoln lubricators, and the LR589NC is the normally closed-wired version of the LR589. Both LR589 products contain a mercury bulb inside a hermetically-sealed mercury switch.


  • Shipping Weight: 12 oz. (340 g)
  • Shipping Dimensions: 4-3/4 x 4-3/4 x 2-3/4 in. (121 x 121 x 70 mm)


  • Shipping Weight:  13 oz. (368 g)
  • Shipping Dimensions: 4-3/4 x 4-3/4 x 3-1/4 in. (121 x 121 x 83 mm)

Dimensions LR579

Dimensions LR579 Oil Level Regulator

Dimensions LR589/LR589NC

Dimensions LR589/LR589NC

Typical Wiring LR579

Typical Wiring LR579

Typical Wiring LR589

Typical Wiring LR589

For more information about this product, you can download the related literature here:

Sales Bulletin (96121; revision date – 08/2021)

Installation (00-02-0062; revision date – 08/2021)