Grease into driveshaft grease zerk: how much?

[Iconic]

I read on this site that when greasing the zerk on the driveshaft, you need to pump grease in until it comes out a hole on the other side (a grease zerk mounted inside out).
I finally got around to greasing this driveshaft zerk and it took 20 "shots" of grease from a normal hand held grease gun. No grease came out the other side but I figured I better stop.
It looked dry on the zerk.
Can anyone give me some insight on this?
Does it take more than 20 shots if very dry?
Is the grease going somewhere it shouldn't?

[Benz Dr.]

Unless it's leaking out somewhere you probably need to put more in there. It must have been very dry if that's the case.

[Iconic]

Thank you Dan.
Do you think the capacity is that large?
Does anyone have a drawing of the area so we can get a perspective on volume and see where it can be leaking to if it is leaking?

[thelews]

If grease starts coming through the floorboards, you've probably put in too much.

[wwheeler]

Right after I bought my W111, I pumped grease until I was blue in the face. I reached the same conclusion as you and stopped. I read more about it and decided to give it another "shot" (sorry for the pun).

It took several more pumps but FINALLY some horrible looking grease came out of the check. I doubt that had been done in ages. I am not entirely sure about the depth of the cavity. But now that mine is filled, I just pump a couple of shots and the grease comes out the check. I do not see any grease escaping, so it must be captured.

The vent is actually a spring loaded check valve that only allows grease to escape when it reaches a certain pressure. Based on the ring of old grease on the driveshaft tunnel right in line with the vent, a little grease probably oozes out when spinning.

So pump it up with confidence!