I suspect the problem with gear lube would be not a good enough seal to hold it in and it would just run out bottom.Madmantrapper,
In my post above I mentioned that it might be better to just pump in gear lube instead of trying to pump in enough grease to lube the bottom bearing because it would take so much grease to fill the mandrel.
I have thought more about it and how to do it, when it dawned on me that all I had to do was remove the grease zerk, stick the oil gun tip into the hole and pump. It would push out the remaining grease in the fitting and run down to the bearing. It shouldn't take more than an ounce or two to do the job.
It would be a lot more effective and economical to use gear lube because it would make it all the way down to the bearing and not just sit there like grease does while the bearing failed. Next time I'm going to try it.
Man that reminds me of some good memories of a 1975 ford F250 I had with a 3300 lb front axile with those miserable felt seals. I did the same as you with the grease. The felt lasted a couple years that way. Without the grease the felt wore out in months.I used a mix of 90W and grease in a 4x4 truck I had,its front axle u-joints were "enclosed" on that truck in a large ball and socket arrangement,that had felt seals and leaked like a seive..
it was supposed to have 90W oil,but it would leak out in a few weeks,and made a mess of the driveway and parking lots--so rather than tear the whole front end apart,I tried pumping in some grease with a grease gun,about half a tube,after a friend said that was an old used cars salesman's trick, to seal them up--after a few weeks once the grease migrated outward to the leaky areas,it barely leaked a drop--the u-joints didn't ever wear out being "drowned" in 90W and grease either,guess the thicker grease didn't harm them any..I wish my current 4x4 didn't have "open" U-joints,they rust to death and fail in 2 years time.. I dont see why 90W and grease wont work on mower spindles..
I think I will try this. I have 200 hours on it now and don't want to have to rebuild mandrels any time soon.MowerGraveyard,
You're correct to a degree, but the bottom bearing is sealed on the bottom side. There might be some seapage over time, or when the seal finally wore out, BUT, by usng gear lube, the bearing and seal would get lubrication that it's now not getting.