How to repair a Dewalt DCH333 DCH334 54V SDS drill that wont hammer or keeps loosing hammer action.

These dewalt 54V sds drills are power full machines but like all hammer drills, they require some maintenance. The o rings on the hammer piston and striker will need replacing if the hammer actoin stops working. Grease eventual needs replacing and the front striker that hits the drill but can get jammed up with dirt and old grease.
Stripping them down, washing them out and changing o rings and seals where needed is the only way to restore the hammer action.
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Dewalt DCH333
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