English
8. Attaching the angle unit. (Optional accessory)
(1)Removing keyless chuck from hammer drill (Fig. 11)
◯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.
Hex. bar |
|
wrench | Locking screw |
| |
| Loosen |
| Fig. 11 |
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.
◯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
◯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)
Angle | Joint | Coupling |
unit | sleeve |
Clamping bolt
Fig. 12
Low speed
High speed
Fig. 13
20