Hilti DX450 servicing 

Hmm, hard to say. Are cartridges wet maybe. Otherwise, firing pin is not engaging fully, maybe some obstruction within mechanism

@@mrfxr1695 Everything was dry enough. I thought it may be from wear of driving pin.

@@marian_f1704 you could get one fresh strip from your local tool hire shop and try. It would be cheapest way to eliminate cartridges question. If it doesn't fire with fresh cartridges, than if firing pin issue.

@@mrfxr1695 Thanks a lot for the advice!

It is DX450 !! I know it is for concrete and steel and I'm NOT firing it into wood. I've bought it with a fault (it had seised ) and I've done a quick service on it so it can be used again safely. All the best 👍🙂

It might need cleaning

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