Greasing the PTO universals in an AC Forty Five

The back three aren't so bad but the front one is a pain to get at from underneath.

But there is a rectangular bump over it in the front left hand corner of the cab floor.   And that has a squarish window cut out at the left hand rear.  

So, if you take a torch (flashlight) and check as you turn the engine over by hand, you will see the grease nipple appear in that window ready for access.  Easier with two people but you work out where it lines up if on your own.

I found that by accident, not in a manual.