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my Hilti hammer drill has no hammer?

I have an older Hilti hammer drill and it runs fine, except the hammering mech., will not initiate when I put pressure on the head. Ive taken it apart but I think the problem is in the shaft area.
Roger, January 2013
SDS Drill? Is the chuck well lubricated? Spray lots of maintenance spray and grease regularly.

Louey, January 2013