Fill Gearbox with Oil and Grease Caster Wheels

What happens here

Using a McNaught (McNaught Industries) gear oil pump, new gear oil is dispensed into the gearbox through the open fill port until it starts to trickle out of the check plug opening (presumably a separate level-check port on the side), indicating it's sufficiently filled. The fill plug is then reinstalled and tightened with an adjustable wrench. The caster wheels on the brush cutter are lubricated by attaching a grease gun (Lock-n-Lube brand) to each zerk fitting and pumping grease until fresh grease extrudes from the bearings.

Goal: Lubricate the gearbox and caster wheels for optimal performance.