Normally, the only zerk fittings are on the tilt adjuster on the right side arm. It has a zerk on top to lube its gears and crank handle and another on the side to lube the threads of the extendable portion. Some tractors do not have the adjustable tilt box, but rather only have a turnbuckle. I think most New Hollands have the box.
I'm attaching a picture of mine. I moved mine to the left when I installed a hydraulic tilt cylinder on the right where it was originally.