Milwaukee M12 CH mini 12v sds drill. Running but not hammering. How to repair.

These Milwaukee M12CH SDS drills are very useful tools.
Perfect for drilling up to a 7mm bit in masonry.

This one was left in as it is no longer hammering. Motor us running fine, and it's going into hammer mode, but it's just not hitting.

The problem is  a worn-out alu piston and striker o ring. Replace them, and you will be hammering again.


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