SAME ISSUE *****SOLVED*****
You were on the right track but needed to go farther with top description without disassembly!!
I have a barely used Hammer drill also that will rotate and run motor but does not hammer in any position.
Grease is the issue.....
Heat and sitting causes the grease to weep out & even a small amount of dust binds up the hammer drill.
******SOLUTION*****
GREASE, GREASE & MORE GREASE....
REMOVE BIT....SQUIRT IN ALOT OF THE BOSCH GREASE HOLD LOCKING CHUCK OPEN. INSERT A SPLINED BIT INTO THE HOLE AND PLUNGE GREASE IN SLOWLY SEVERAL TIMES. REMOVE BIT & REFILL GREASE & REPEAT.....VOILA.....HAMMER WORKING AGAIN....
BE SURE TO USE LOTS OF GREASE & DUST COVERS ON Bosch HD WHEN WORKING. WE ALL ERROR AND FAIL TO MAINTAIN FROM TIME TO TIME!
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