You should service your winches at least once during the preseason, ideally twice if your boat lives in salt water. If you race your boat hard, you may want to maintain your winches before every regatta. Keep your winches clean and operating smoothly by flushing frequently with fresh water. Use Harken Pawl Oil to maintain pawls in optimum condition.
Harken winches - Quick Service overview
Harken Pawl Oil - datasheet