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Fig. 11
Hex. bar
wrench
Locking screw
Loosen
8. Attaching the angle unit. (Optional accessory)
(1) Removing keyless chuck from hammer drill
(Fig. 11)
⅜ To remove the keyless chuck from the ham-
mer drill, open the keyless chuck jaws as far
as possible and turn out the locking screw
(left hand thread). This screw locks the key-
less chuck to the spindle. Install the hex. bar
wrench into the keyless chuck. Place the
accessory wrench in the hexagonal opening
of the angle unit spindle. Tightly restrain the
hammer drill on a firm base. Turn the keyless
chuck until the wrench is at about a 30° angle
to the bench top and strike the wrench sharply
with a hammer so the keyless chuck turns in
the counterclockwise direction (viewed from
the front side). This should loosen the key-
less chuck from the spindle which has a right
hand thread and you will be able to remove
the keyless chuck by hand.
CAUTION:
If the keyless chuck cannot be removed by striking the wrench, don’t strike the wrench
forcibly and send the hammer drill to a HITACHI AUTHORIZED SERVICE CENTER.
(2) Attaching the angle unit.
⅜
After removing the keyless chuck, rotate the
change letter to ROTATION side. Engage the
coupling to the hammer drill spindle, fit the
joint sleeve to the gear cover, attach the angle
unit to the other end of the joint sleeve, and
turn the angle unit slightly in either direction
so the hex. hole in the coupling engages the
hex. portion of the angle unit spindle. Adjust
the direction of the angle unit and tighten the
joint sleeve by clamping bolts.
Tighten two clamping bolts equally and
gradually in turn with a torque of 61-70 ln-
lbs. (70-80kgf·cm) (extent of force which can
be subjected by only a wrist with the open
end wrench provided to tight clamping bolts.).
(Fig. 12)
⅜ To operate the angle unit at low speed, at-
tach the keyless chuck to the angle unit spindle
at the side marked “LOW” and secure the
locking screw. At this setting, the drilling
speed is decreased to about 70% and the
drilling torque is increased to about 150%.
(Fig. 13)
Fig. 12
Fig. 13
Angle
unit
Joint
sleeve
Coupling
Clamping bolt
Low
speed
High speed