Black grease from UJoints

[Kubaat3lover]

Hello friends, I Hope everybode is fine...
Last year Ive replaced my Ujoints in Gen2, it was a tough job,
Before this boating season Ive greased the UJoints and saw the grease is coming out is black,
Im using Quicksilver Extreme pressure grease. I did maybe 15 hours last season, so why is that? Did I screw up something when installing?
Also Ive noticed when pumping new grease from 1-2 caps the grease comes out easily but from others 2 the grease doesn't come off at all with pumping a lot...

 

[ScottinAZ]

as the grease does its job, it isnt unusual for it to turn blackish. as for which caps it comes out of, they share internal channels, so those that have the least resistance will have grease come out of them first. Not much you can do about this.

 

[Bondo]

as the grease does its job, it isnt unusual for it to turn blackish. as for which caps it comes out of, they share internal channels, so those that have the least resistance will have grease come out of them first. Not much you can do about this.

Ayuh,.... Tap the opposite side of the shaft/ joint with a hammer,....