Crank Keeps Coming Lose ???

Edocsil
Edocsil Posts: 15
edited May 2009 in MTB workshop & tech
Recently I have had a problem where my left crank will come lose from the bottom bracket within 5 minutes of getting on the bike. I have had the bottem bracket replaced hoping it would fix the problem, but even with the new bottom bracket the crank keeps coming lose. Any ideas on what the problem might be and what I need to do to sort out the problem?

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