Press release button and remove shoe on front of saw. Remove 2 screws on front end. Slide off rubber covering. To open gearbox remove 4 screws and pull off. Note, once open yo probably have to replace the gasket. If saw is jammed, try spray a penetrating oil in and tap shaft with a hammer using a wood dowel for contact. You can remove the 2 rubber plugs from the gear casing and pump in grease without removing the cover.
Stephen Brown