Model EY6406 • EY6407 • EY6431^WARNINGThis service literature is designed for experienced repair technicians only and is not designed for use by the general public. It does notcontain warnings or cautions to advise non-technical individuals of potential dangers in attempting to service a product. Productspowered by electricity should be serviced or repaired only by experienced professional technicians. Any attempt to sen/ice or repair theproduct or products dealt with in this service information by anyone else could result in serious injury or death.DISASSEMBLY / ASSEMBLY INSTRUCTIONSRef. No. 1A Procedure 1A Removal of the keyless drill chuck.Lock handleScrewdriver ChuckAllen wrench ChuckAllen wrench ChuckSet the clutch handle to position and'LOW" position.Turn the lock handle counterclockwise directionto open the chuck jaws.Use a screwdriver to turn the chuck fasteningscrew inside the chuck clockwise direction of thearrow, and remove the screw. (See Fig. 1)NOTE : If the chuck fastening screw will notcome loose, insert the alien wrenchinto the chuck and lightly tap in theclockwise direction with a hammer totighten the chuck, and then loosen thechuck fastening screw. (See Fig.2)Insert the alien wrench into the chuck, and turncounterclockwise direction in the arrow withholding the unit by the vise to remove thechuck. (See Fig. 3)Ref. No. 2A Procedure 2 A Removal of the housings.