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14
(2) Adjusting the dust-collecting adaptor.
a) Adjusting the position of the dust-
collecting adaptor.
After firmly inserting the drill bit,
loosen the wing bolt and drill bit tip
and the end of the dust-collecting
adaptor in contact with each other
(see Fig.11).
b) Setting the hole-drilling depth.
Move the stopper to determine the
stroke. The stroke is the hole-drill-
ing depth (see Fig.11).
⅜ The maximum hole-drilling depth
when using the dust-collecting
adaptor is 4" (100 mm).
⅜ It is possible when using the dust-
collecting adaptor to use HITACHI
drill bits up to a overall length of 8-
1/2" (216 mm). A hole-drilling depth
of 1-3/4" (46 mm) will allow dust-
collecting when the overall length
of the drill bit is 4-9/16" (116 mm).
(3) Drilling holes
When drilling holes, secure the main
unit so that the end of the dust-collect-
ing adaptor contacts with the concrete
surface perfectly during drilling. Dust-
collecting effectiveness is reduced if the
adaptor is not in contact with the sur-
face (see Fig.12).
(4) Removing dust
Excessive dust in the dust bag will re-
duce dust-collecting efficiency. Remove
dust from the dust bag regularly.
Remove the dust bag from the main
unit, pull out the rail and throw away
the dust and clean. (see Fig. 13).
Fig.11
Fig.13
Stopper
Stroke
Wing Bolt
Dust Bag
Rail
Fig.12