How often should I grease my string trimmer’s gear box?
To reduce the risk of injury and ensure the long life of the equipment, check the grease level after every 25 hours of operation and add Premium High Temperature Lithium Wheel Bearing Grease Grade NLGI#2 when needed. To add grease, unscrew filler zerk. Assess grease level on the inside of gearbox. Refit and firmly tighten the filler zerk. If no grease was visible, use a grease gun fitted with a needle tip adapter to insert no more than 5 g (0.2 oz.) of grease into the gearbox.