Dust Collector (B) - Hitachi DH 14DL Technical Data And Service Manual

7. Dust collector (B)

When drilling holes overhead, dust collector (B) (optional accessory) can be mounted to prevent dust and
chips from falling downward. Dust collector (B) is intended solely for use when drilling holes in concrete,
and cannot be used for drilling holes in steel or wood. It is designed for use with drill bits with overall length
of 166 mm, 160 mm and 110 mm, and cannot be used with any longer bits. When using a drill bit with an
overall length of 166 mm with dust collector (B), drilling up to a depth of approximately 72 mm is possible.
When using dust collector (B), ensure it is securely fastened to the grip on the main body with socket
adapter (B). Although socket adapter (B) rotate together with the tool shank, there is a steel ball between
the outer race and the socket which serves as a ball bearing. Should the dust cover be forced against the
concrete surface, it will not rotate even though the tool shank continues to rotate. Should the tool be
operated when the dust cover is not being held against a concrete surface, friction may cause dust collector
(B) to become disconnected from the grip. Accordingly, caution the customer to press dust collector (B) and
drill bit firmly against the concrete surface before tuning on the switch to start drilling. When dust collector
(B) is used, almost no dust and chips are scattered about. However, since the chips and dust remaining in
the collector may scatter after completion of the drilling operation, the customer should be advised to
always wear protective eyeglasses. When dust collector (B) is disassembled for repair or maintenance, be
very careful to prevent oil or grease from adhering to the steel balls. Grease or oil on the steel balls may
cause concrete dust to enter the unit and cause defective rotation.
Fig. 5 Structure of dust collector (B)
Dust cover
Retaining ring for D30 Shaft
Approx. 72
Approx. 16
Seal cover
Washer
Socket
Outer race
D6.35 steel ball
18
Grip
(on the main body side)
Socket adapter (B)