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T ECHNICAL INFORMATION 53381 Subject Change of Cam A and Cam B. For Models 8406,8416,8420V (Hammer Drill) Description For improvement in endurance, Cam A and Cam B have been changed as fo1Iows 1) Change of shape Cam A and B have been slightly changed in shape of contacting faces. 2) Change of hardness Made both Cam A and Cam B harder by changing type of alloy and heat-treatment. 10 11 Note Parts color has been changed from Black to Gray for indentification. Interchangeability(I/C) Item No. Current part Q'ty I/C New part Q'ty Note Cam A Cam A 10 1 No 1 223069-9 223124-7 Interchangeable sa a set Cam B Cam B 11 1 No 1 223070-4 223125-5 Implementation 8406 :Form Serial No. 25726E(Mar.1997) 8416 :Form Serial No. 255883E(Mar.1997) 8420V:Form Serial No. 33121E(Mar.1997)