Enlarging the hole doesn't help. It's pointed directly at the cab. The problem is to being able to access the grease fitting without using the provided access hole, since it's not accessible.
The grease fitting can be reached from above when the FEL is lowered, but the current fitting is recessed and points to the rear so you can't get a gun on it. There's not enough room to add an extension hose that can accommodate the wide range of motion of the end of the FEL arm.
The solution is to extend the fitting enough to be reachable from above, and point it upward, not to the rear. There have been a couple of suggestions on how to do that.