HJ60 front drive shaft problem

[glenxr650]

Hello all,
While greasing my chassis on the weekend, I noticed that the welsh plug on the slip joint of the front driveshaft has popped out. It is located at the end of the shaft behind the universal joint. When I grease the slip joint, the grease comes out of the end of the shaft, not through the slip joint. I remember greasing this in the past and it being under quite a lot of pressure. I think that the welsh plug has popped out during rapid front suspension travel (shortening of the shaft) and then hydraulically pressing it out.
Is this common?
I have repaired it but what is to stop it happening again?
Cheers,
Glen.

[2car]

Grease is virtually incompressible. Don't use so much that it oozes out. You need to retain some air in the slip joint. Just put a few 'pumps' in regularly - like once every two or three months.

[Pesky Pete]

Slip joints really only need a minimal amount of grease. If too much is pumped in, it can do all sorts of things as it is really tough to compress. A hydraulic effect could certainly be the cause for the popped welsh plug

Cheers

Pete

[glenxr650]

Thanks guys.
I think I must have been over zealous with the grease gun last service.
I like to see old grease oozing out when I do uni joints, but as you have pointed out, this coupling doesn't require a "purge", just a couple of squirts of the gun.
Cheers,
Glen.