Maintenance And Inspection - Hitachi PR-25B Instrucciones De Manejo

(4) Attach the plug to the anchor tip and drive in the anchor
again with the rotary hammer.
(5) After driving in the anchor, use the drift key to separate
the anchor. (Fig. 7)
(6) By employing a manual hammer or pliers, snap off the
tapered portion of the anchor. (Fig. 8)
CAUTION
Since the snapped off tapered portion will fl y about, pay
attention to the snapping direction.
2. When a rotation and impact anchor adapter is used
(1) Attach a self-drilling anchor to the anchor adapter.
(2) Turn ON the switch and drill a base hole with the self-
drilling anchor.
At the start of the hole-drilling slightly tilt the Drill to
determine the hole position.
(3) After clearing out dust with a syringe, attach the plug
to the anchor tip and drive in the anchor with a hand
hammer.
(4) For further operation, follow procedures (5) and (6)
described above, when an impact anchor adapter is
used.
3. When a taper shank adapter is used
(1) Attach a drill bit with tapered shank to the taper shank
adapter.
(2) Turn ON the switch, and drill a hole until it reaches the
hole depth indicating groove. (Fig. 9)
(3) After cleaning the dust with a syringe, attach a plug to the
anchor tip and drive in the anchor with a manual hammer
or pliers.
HOW TO HANDLE A CORE BIT
When a core bit is used, large caliber holes and blind holes
can be drilled. In this case, use optional accessories for
core bits (such as a center pin and core bit shank) for more
rational operation.
1. Mounting
CAUTION
Prior to mounting a core bit, always disconnect the plug
from the power supply receptacle.
(1) Mount the core bit on the core bit shank. (Fig. 10)
Before that, feed oil the screw portion of core bit shank for
easily dismount.
(2) Mount the core bit shank on the Drill main body in the
same manner as in mounting the drill bit and the bull
point. (Fig. 11)
(3) Insert the canter pin into the guide plate until it reaches
the extremity.
(4) Fit in the guide plate by aligning its concaved portion
with the core bit tip. When the position of the concave is
shifted by turning the guide plate right or left, the guide
plate never slips off even when the Drill is used in a
downward direction. (Fig. 12)
2. Drilling holes
(1) Insert the plug into a power supply receptacle.
(2) A spring is built in the canter pin. By straightly and gently
pressing it to the wall or fl oor surface, the entire surface
of the core bit tip attains contact to start the hole drilling
job.
(3) When the hole depth reaches approximately 5 mm, the
hole position can be determined.
Then remove the canter pin and guide plate from the core
bit and continue the hole drilling job.
CAUTION
When removing the center pin and guide plate, always
disconnect the plug from the power supply receptacle.
3. How to dismount the core bit
(1) By holding the Drill (with the core bit inserted) in an
upward position. drive the Drill to repeat impact operation
two or three times, whereby the screw is loosened and
the Drill becomes ready for disassembly.
(2) Remove the core bit shank from the Drill, hold the core
bit with one hand, and strongly strike the head of the
hexagonal portion of the core bit shank with a hand
hammer two or three times, whereby the round head
screw is loosened and the Drill is ready for disassembly.
OIL FEEDING
CAUTION
Prior to oil feeding, always disconnect the plug from the
power supply receptacle.
Since an oil chamber is built in this Hitachi rotary hammer,
it can be used for approximately 20 days without supplying
lubricating oil, assuming that the Hammer is used
continuously 3 – 4 hours daily.
Feed oil into the oil tank as described below before using this
rotary hammer. (See Fig. 15 and 16)
1. Just before no oil is visible in the oil gauge window when
the device is held upright, feed oil without fail.
2. Before feeding oil, use the provided wrench to remove
the oil gauge.
Be careful not to lose the rubber packing attached below
the oil gauge.
3. Check the oil level once daily, confi rming that oil is fi lled.
4. After feeding oil, securely clamp the oil gauge.
NOTE
As an optional accessory, oil for the Hitachi rotary
hammer (one liter) is sold separately. Use this oil when
oil in the tank is depleted. Shell Oil Co. ROTELLA #40
(engine oil) can also be used. This oil is sold as Shell
fi lling stations most anywhere.

MAINTENANCE AND INSPECTION

1. Inspecting the drill bits
Since use of a dull tool will cause motor malfunctioning
and degraded effi ciency, replace the drill bit with new
ones or resharpen them without delay when abrasion is
noted.
2. Inspecting the mounting screws
Regularly inspect all mounting screws and ensure that
they are properly tightened. Should any of the screws be
loose, retighten them immediately. Failure to do so could
result in serious hazard.
3. Maintenance of the motor
The motor unit winding is the very "heart" of the power
tool. Exercise due care to ensure the winding does not
become damaged and/or wet with oil or water.
4. Inspecting the carbon brushes (Fig. 17)
The motor employs carbon brushes which are
consumable parts. Since an excessively worn carbon
brush could result in motor trouble, replace the carbon
brushes with new ones which having the same carbon
brush No. shown in the fi gure when they become worn to
or near the "wear limit". In addition, always keep carbon
brushes clean and ensure that they slide freely within the
brush holders.
○ Replacement steps
The carbon brush can be removed by removing the
tail cover and brush cap in that order at the interior.
5. Inspection of the dust cover
The dust cover functions as dust-proof of inside
mechanism.
When the interior of the dust cover is worn, replace the
new dust cover. The dust cover can be removed by
pulling.
6. Service parts list
CAUTION
Repair, modifi cation and inspection of Hitachi Power
Tools must be carried out by a Hitachi Authorized Service
Center.
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