Why do breaker retainer keys break?
The retainer key holds the tool in the front head. A broken or bent key is usually the sign of another problem.
Blank firing
Run without the tool resting on a surface, the piston blow drives the tool forward and the key takes that load. Blank firing is the most common cause of broken keys.
Worn tool or bushings
A worn key slot on the tool or slack bushings let the tool work at an angle and put shock loads on the key. Check the tool’s key slot and the bushings when you change the key.
Running without grease
Without grease the key and the tool slot rub dry, wear and notch. A notched key breaks under impact.
When you change the key
Use the key and its retaining pin made for your breaker model together. Do not straighten and refit a bent or cracked key.