I was on my round with the grease gun on Tuesday...
My rear shaft shows grease on the sliding piece, so I always grease it only lightly (2 pumps) to prevent binding. Just like WarDamnEagel suggested..
But my front shaft doesn't show much grease on the slider. It's rather dry. I always give it like 3 pumps, but never saw it coming out anywhere. But I don't dare to put more.
How can I know I have sufficient grease in it / where is the borderline to overgreasing it?
grease started coming out the front center near the U joint.
That's new to me. I always thought the shaft tube would be sealed, which would be one of the reasons why putting too much grease would bind the shaft as the sliding piece would hit the grease like in a hydraulic cylinder. I never saw a shaft with the ujoins out, though.
Wouldn't such a sealed hole actually make sense, i.e. popping the seal and allow excess grease to be pushed out in case the sliding piece hits it?
Regarding knuckles:
I also only knew the suggestion WarDamnEagel cited. 2/3 full, measure with a zip tie. I also look at the knuckle balls: As long there is grease coming to them like more than half way up, I call it OK. I guess, once the level will be low, the upper part of the knuckle ball won't show any greasing any more. Time for action then.
I however wonder on the wheel bearings. How to check on and grease those? Pulling the hubs all apart to get into it is quite a job.
(There is just one type of stupid questions: The ones not ask..)