Fix hammer action in a hammer drill
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Step 1: The Damaged Drill
Step 2: Spare Parts
The spare parts drawing
Step 3: Remove the Chuck Cover
Remove the chuck cover. Pull back the locking bush and remove the rober cup with a small screwdriver
Unscrew the 4 phillips screws and remove the cover
Unscrew the 3 allen screws and remove the metallic plate
Remove the cylinder and find the small piston
Step 7: The Old O-ring
The old o-ring
Step 8: Replace the O-ring
Replace the o-ring with a new one