On two occasions my non-drive side crank arm has started coming loose. The Truvative I disassembled the crank from the bottom bracket spindle and cleaned the grease off the spindle and put it all back together. The second time it came loose it used degreaser, and blew all the grease out of the crank bolt assembly, scrubbed the spindle, and removed the bearing seal to wipe it down and remove the grease from the surfaces of the seal and the outside of the cartridge bearing. Let’s see if this holds up.
Doing a search on the SRAM/Truvative site I found this manual (PDF) which states that the splines, and threads need to be greased. Well, I guess I need to call their warranty group to see what they have to say.
UPDATE:
After striping the grease off the crank bolt, spindle, and bearing seal, the crank did not come loose. In light of the SRAM tech specs though I decided to try another solution…
Upon further research several sites have posted threads discussing Truvative cranks coming loose. It appears that the solution to the problem lies in greasing the head of the bolt, the splines, the floating seal, and using loctite on the threads on the bolt. I only had blue loctite and will try this first. Many posts seemed to indicate that the heavier-duty green loctite was the solution. Time will tell.