My Alpine is a little bigger than your 3121, same axles. I used to repack every other year and use the EZ Lube zerks on the off year when I only did 2-3k miles per year. Didn’t really pump a lot of grease into the EZ Lube, just about 5 pumps on the grease gun to get some new grease into the rear bearings. Many people on here will tell you not to use the EZ Lube, too many horror stories of people not doing it correctly, over filling, blowing out the rear seal and greasing the brakes. I’ve never had an issue with that doing it the way i did. I’ll admit i only did it because I didn’t feel like repacking every year for 3k miles of use, but wanted some new grease in the bearings (only the rear bearing, but it made me feel better). I guess it was my way to justify being too lazy to do a repack every year. Now that I’m retired and putting more miles on the RV each year, 5-10k, I repack every year. Dexter has specs on what is required for grease, there’s a lot of very good options out there. Many people in here have had good luck with red and tacky, I’ve used Amsoil and Mystik in the past, but now I use Sta Lube wheel bearing grease.
My Alpine is 10 years old now with around 50-60k miles, OE bearings still look new. Just finished my annual repack last week.
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Brent
2013 Alpine 3500RE
2019 Silverado 2500HD Duramax
U.S. Air Force Retired (25 yrs)
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