Losing your private key is not necessarily a reason to submit a revocation request, depending on how you lost it. If, for example, you accidentally deleted the file and there is no backup, you don’t need to file a revocation request. Instead, you can contact your CA to have the certificate reissued. SSL.com can issue a new certificate from a new key pair you generate. If, however, you lost it in a way that it could very likely fall into someone else’s hands, such as a hard drive being stolen or misplaced, you’ll likely want to take action to have the certificate revoked.