Anyone else concerned about excessive pressures and the forces too much grease in one application into the slips can produce? Depending on the quality of the grease gun you can produce anything from 2000 - 15000 psi and output 0.5-3.0 grams per stroke. Having blown out wiper seals in other equipments (and having to tear down/repair and deal with the resulting down time) by "just a couple more pumps" I'm very much in the camp of fewer pumps spread over a period of time for this application, just to error on the safe side. I'm lucky in that I don't have to try and make up for potentially neglected greasing routines though. Personally I wouldn't apply 50 or 70 strokes to the slips in one siting. But as always YMMV.
I've been concerned for years:
Lubing propeller shaft Risky (AKA Drive Shaft)
A few pumps spread over time is a great idea! A few pumps in propeller shaft's yokes that have been service properly is all that should be needed.
However when I'm setting up a rig for someone else that has not been properly service, this isn't always practical. As it will most likely come back with a clunk.
I do use a pneumatic grease gun (PITA prime from HF), but with caution. I've found with our aging fleet these seals are often more cooperative. Especial in those that haven't been properly service as seal have worn, allowing grease to pass easier.
Provided I prime (clean & grease outer seal lip) and repeatedly pump & stop (until 1/8" extension then wait for compression) slowly, grease will usually flow. But sometime even after flow starts it will stop if grease is pumped in to fast as pressure builds. This has convinced me our biggest issue is the inner lip of seal (duel lip seal) tights under pressure cutting off flow. When this happens I pull the grease zerk and let pressure bleed off. It is scary how much will bleed out in some case, which has tough me to go slow and easy.
When I suspect
stiction or very tight inner side of seal I'll use some#1 w/moly grease, it's worked every time to knock out clunk in difficult cases
Here you'll see three different colored greases: #1 w/moly purple, #2 M1 red and some brown old grease pushing out.
My thoughts right now are this,
My rig has 440,000 miles in it.
I don't think my trying to get grease past the seal is going to hurt anything as this point, lol...
I have put quite a few pumps into the shafts and can barely see some extension at times but have yet to see good new grease coming past the seal.
I'm wondering if I should raise the whole rig on jack stands front and rear to extend front and rear shafts fully and then try and fill them.
A shop foreman at Toyota dealer once said to me "my guy's know too keep back wheel on ground when pumping in grease" This keeps pressure/shafts at neutral position.
