Cat water pump bearing

Also have a 3126 and I had mine greased last March. Wrote up a story about it on my blog...with pictures. There's even a pic by another DIY'er that shows what that extension looks like after installation.

Maybe this will help: Messing with the waterpump Zerk Fitting

I grease mine a couple of times a year. I lift the bed and brace it up, then remove the rear engine cover. I can reach mine that way. I can't see anything in that area, but I'm used to it so I can find it by feel. I use a small grease gun with a rigid nozzle, not a flexible hose. I had to grind one side off the grease nozzle on my little grease gun. This allows me to get the nozzle onto the zerk and push it straight down so it latches on. Then I give it about six pumps. After removing the nozzle, I use a rag to clean around the zerk to avoid getting grease on the serpentine belt.
I wish I could reach the zerk from the ground, but no way. And the place I take the coach for lube/oil change won't touch it, for fear of getting grease on stuff inside the coach. Probably a good thing.

Hard-To-Reach Grease Fittings

http://greaseextensionhoses.com/

I believe the 3126 is similar to the C7 and if so, the bearing you are referring to (about in the center of the block and drives the fan on rear rad engines) is not the water pump, but rather an idler/fan pulley. The water pump is mounted low on the engine and most, except for some C7's like mine, have a separate belt. Regardless of that, I have read where others have added additional tubing/hose to extend the zerk fitting to a more accessible location. Another option might be to replace the existing bearing with a seal bearing like many of the the C7 engines have. I'm willing to bet our resident CAT expert Brett (wolf10) will jump in at some point with some specific info on this topic. Good luck.

Lou
05 Travel Supreme Envoy
CAT C7