My rotary hammer stopped rotating and was only hammering.
I found the nut had backed off that hold the friction clutch together, so the bits no longer rotated.
The nut is left hand thread.
I was wondering how tight that nut should be.
This is a CMT drill I got from Ebay many years ago
I am thinking just use my air wrench on the nut to tighten it up while letting the gear spin.
I also had to repair and then shim the selector arm pivot that engages-disengages the hammer action.
Spring pressure wore it down. The design means spring pressure is always on that. Right gear has this sliding rod that disengages the hammer action, that rod cylinder bears down on the lever arm constantly
I totally took everything apart to clean it and was surprised how much gritty stuff gets into it. I suppose from beating on concrete and bricks.