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8. PRECAUTIONS IN DISASSEMBLY AND REASSEMBLY
Please follow the precautions below for disassembly and reassembly procedures.
The [Bold] numbers in the descriptions below correspond to the item numbers in the Parts List and exploded
assembly diagram.
8-1. Disassembly
8-1-1. Removal of the drill chuck
(1) For keyless chuck
The Drill Chuck [3] is fixed to the Spindle [4] with a UNF 1/2" --- 20 right-hand thread and Flat Hd. Screw (A)
(Left Hand) M6x 25 [1]. First, open the jaws of the keyless chuck fully. Insert a 14 mm wrench into the wrench
mounting portion of the Spindle [4] and turn the Flat Hd. Screw (A) (Left Hand) M6 x 25 [1] clockwise to
remove it. Then, fit the hexagonal bar wrench for M10 into the keyless chuck and turn it counterclockwise to
loosen and remove the keyless chuck.
(2) For conventional chuck (with chuck wrench)
The Drill Chuck [3] is fixed to the Spindle [4] with a UNF 1/2" --- 20 right-hand thread and Flat Hd. Screw (A)
(Left Hand) M6x 25 [1]. As shown in the figure below, fit a J-78 ring ass'y (special repair tools, Code No.
970817 and 970818 are recommended) onto the drill chuck body, and secure it in a vise. At this time, ensure
that the pin of the ring ass'y is properly inserted into the chuck wrench mounting hole of the chuck. Open the
jaws of the Drill Chuck [3] fully and turn Flat Hd. Screw (A) (Left Hand) M6 x 25 [1] clockwise with a flat-blade
screwdriver to remove it. Then, fit a 14 mm wrench to the flat surfaces on the spindle, and rotate it
counterclockwise to loosen and remove the drill chuck.
Drill Chuck [3]
Main body
Hexagonal bar wrench for M10
14 mm wrench
Vise
When mounting
portion of Spindle [4]
J-78 ring ass'y
14 mm wrench
Drill Chuck [3]
Vise
When mounting portion of Spindle [4]
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