Maintenance And Inspection - Hitachi Koki DH 22PH Handling Instructions Manual

English
6. Hammering only
This rotary hammer can be set to hammering only
mode by turning the change lever to the
(Fig. 11).
(1) Mount the bull point or cold chisel.
(2) Set the change lever to middle of
mark (Fig. 12).
The rotation is released, turn the grip and adjust the
cold chisel to desired position (Fig. 13).
(3) Turn the change lever to
Then bull point or cold chisel is locked.
7. Using depth gauge (Fig. 14)
(1) Loosen the knob on the side handle, and insert the
depth gauge into the mounting hole on the side handle.
(2) Adjust the depth gauge position according to the
depth of the hole and thighten the knob securely.
8. How to use the drill bit (taper shank) and the taper
shank adapter
(1) Mount the taper shank adapter to the rotary hammer
(Fig. 15).
(2) Mount the drill bit (taper shank) to the taper shank
adapter (Fig. 15).
(3) Turn the switch ON, and drill a hole in prescribed
depth.
(4) To remove the drill bit (taper shank), insert the cotter
into the slot of the taper shank adapter and strike the
head of the cotter with a hammer supporting on a
rests (Fig. 16).
LUBRICATION
Low viscosity grease is applied to this rotary hammer so
that it can be used for a long period without replacing
the grease. Please contact the nearest service center for
grease replacement when any grease is leaking form
loosened screw.
Further use of the rotary hammer with lock off grease
will cause the machine to seize up reduce the service life.
CAUTION
A special grease is used with this machine, therefore,
the normal performance of the machine may be badly
affected by use of other grease. Please be sure to let
one of our service agents undertake replacement of
the grease.

MAINTENANCE AND INSPECTION

1. Inspecting the drill bits
Since use of a dull tool will cause motor
malfunctioning and degraded efficiency, 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.
11
mark
mark and
mark (Fig. 11).
4. Inspecting the carbon brushes (Fig. 17)
The motor employs carbon brushes which are
consumable parts. Since an excessively worn carbon
brush can result in motor trouble, replace the carbon
brush with a new one having the same carbon brush
No. shown in the figure when it becomes worn to or
near the "wear limit". In addition, always keep carbon
brushes clean and ensure that they slide freely within
the brush holders.
5. Replacing a carbon brush (Fig. 18)
Disassembling
(1) Loosen the three screws on the handle cover, and
remove the handle cover.
(2) Lift out the brush holder together with the carbon
brush, while being very careful not to forcibly pull
the lead wires within the brush holder.
(3) Withdraw the brush terminal, and remove the carbon
brush from the brush holder.
Reassembling
(1) Place a new carbon brush into the brush holder, and
connect the brush terminal to the carbon brush.
(2) Return the brush holder and other parts to their
original positions, as illustrated in Fig. 18.
(3) Place the lead wire in the specified position. Be very
careful not to allow the lead wire to contact the
armature or rotating parts of the motor.
(4) Replace the handle cover, while being careful to
ensure it does not pinch the lead wire, and secure it
firmly with the three screws.
CAUTION
Should the lead wire be pinched by the handle cover
or come in contact with the armature or rotating
parts of the motor, a serious danger of electric shock
to the operator will be created. Excercise extreme
caution in disassembling and reassembling the motor,
following the above procedures exactly.
Do not attempt to disassemble any parts other than
those necessary to effect replacement of the carbon
brush.
6. Service parts list
CAUTION
Repair, modification and inspection of Hitachi Power
Tools must be carried out by an Hitachi Authorized
Service Center.
This Parts List will be helpful if presented with the
tool to the Hitachi Authorized Service Center when
requesting repair or other maintenance.
In the operation and maintenance of power tools, the
safety regulations and standards prescribed in each
country must be observed.
MODIFICATIONS
Hitachi Power Tools are constantly being improved
and modified to incorporate the latest technological
advancements.
Accordingly, some parts may be changed without
prior notice.
GUARANTEE
We guarantee Hitachi Power Tools in accordance with
statutory/country specific regulation. This guarantee does
not cover defects or damage due to misuse, abuse, or
normal wear and tear. In case of complaint, please send
the Power Tool, undismantled, with the GUARANTEE
CERTIFICATE found at the end of this Handling
instruction, to a Hitachi Authorized Service Center.