Hydraulic breaker bushing lock pins help retain and locate bushings in the front-head assembly. Wear, deformation or pin failure may affect bushing positioning and, in some designs, lubrication-passage alignment. This guide explains common symptoms, inspection methods, grease-flow troubleshooting and replacement considerations. Learn how to check the pin, bushing and front-head locking area together and identify the correct replacement component for your hydraulic breaker model.