Makita HP1620 Technical Information page 3

R
epair
< 2 > Removing drill chuck
Firmly hold No.1R139 "Drill chuck extractor" with vise. And lock spindle with the drill chuck extractor.
Holding No.1R298 "hex socket" with drill chuck, and turn the hex socket with No.1R223 "Torque wrench"
counter clockwise. So drill chuck can be disassembled from spindle. See Fig. 2.
(Removing keyless drill chuck with trouble)
If the drill bit sticks in keyless drill chuck, it can be difficult to turn the sleeve portion by hand for removing
the drill bit.
In this case, turn the hex nut with wrench 19 cluckwise vewing from bit side, while holding the sleeve portion
with pipe wrench firmly. So the drill bit can be removed from the keyless drill chuck.
See Fig. A.
< 3 > Mounting drill chuck
Firmly hold No.1R139 "Drill chuck extractor" with vise. And lock spindle with the drill chuck extractor.
Holding No.1R298 "hex socket" with drill chuck, and turn the hex socket with No.1R223 "Torque wrench"
clockwise. So drill chuck can be assembled to spindle. See Fig. 2.
<Note in assembling>
Pre-set the fastening torque of the torque wrench with 35.7 - 45.9 N.m (350 - 450kgf.cm), when assembling.
No.1R223
Torque wrench
Retaining ring portion
Sleeve portion
Hex nut
Fig. A
No.1R224 Ratchet head
No.1R298 Hex socket
Wrench 19
Pipe wrench
1R139 Drill chuck extractor
Fig. 2
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