white banner donaldson


Air Filter and HVAC Service Indicators & Gauges

To determine if the Filter Minder® is working properly, if the window on a single position service indicator is showing red, or the position indicator on a graduated service indicator is showing in the window, reset the service indicator by pushing at the end of the indicator. If it resets to zero, the service indicator is operating properly.

Read more ...

Fuel Filter Service Gauge

To determine if the Fuel Filter Minder® is working properly, removal of the service indicator is usually not recommended. It can be checked if there is some fuel filter restriction, and the position indicator is showing in the window of the service indicator.

Read more ...

Air Filter Switch Indicators

Check the mechanical operation of the Filter Minder® by following the above instructions for service indicators and gauges.

Read more ...