Clean any dirt or debris off of the Zerk fitting before applying grease.

Slide the grease gun nozzle straight onto the Zerk fitting on the left side of the chain roller assembly.

Push the nozzle until you feel the nozzle snap into place on the fitting.

Depending on how big your grease gun nozzle is, the nut around the fitting might stop the nozzle from fully snapping into place. In this case, hold the nozzle in place while you use the grease gun.