There is not a consensus on how often machines need to be tuned or serviced, mostly because of varying opinions and different machine types and usage factors. However, if your machine has been stored for a length of time, a service can clean out dust, dirt, and random elements that might settle in. Moderate- or heavy-use machines can often be self-maintained by oiling as needed and providing basic TLC. This might require some disassembling on your part. If your machine is struggling and you are not handy in the DIY world, take it to a professional.