Landing gear lubrication

Those lower zerks won't grease the screws unless you pump the cavity full of grease. If you put enough grease in there some will eventually make its way to the screw. Personally I'd pull the zerk and use a spray grease on the screws when the legs are down.

Also depending on what kind of legs you have, Venture I'm assuming, you should take the gearbox apart and grease the gears in there. There is very, very little grease in that gear box.