Maintenance And Inspection - Hitachi DH 14DL Handling Instructions Manual

8. Switching between the "SAVE" and the "POWER"
modes
The hammering force of the hammer can be
increased or decreased to conform with intended
usage, by operating the shift knob as per Fig. 24.
Adjust the force to match the usage intended.
(1) "SAVE" mode ... decreased hammering force
This can prevent thin drill bits which are less than
4.3 mm in diameter, from being bent or broken.
(2) "POWER" mode ... increased hammering force
This can be used to speedily and efficiently drill
holes when the drill bits which are being used are
greater than 4 mm in diameter.
This can be used to drill holes into wood or metal.
CAUTION:
Do not drill holes in wood with the "SAVE" mode.
There is a likelihood that the motor will burn out
because it can easily lock up due to the low power.
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 despite the grease
shortage causes damage to reduce the service life.
CAUTION:
A specific grease (FG-6A) is used with this machine,
therefore, the normal performance of the machine may
be badly affected by use of different grease. Please be
sure to let one of our service centers to undertake
replacement of the grease.

MAINTENANCE AND INSPECTION

1. Inspecting the tool
Since use of a dull tool will degrade efficiency and
cause possible motor malfunction, sharpen or
replace the tool as soon as 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. 25)
The motor employs carbon brushes which are
consumable parts. Since and excessively worn
carbon brush can result in motor trouble, replace
the carbon brush with new ones 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.
NOTE:
When replacing the carbon brush with a new one,
be sure to use the Hitachi Carbon Brush Code No.
328481.
5. Replacing carbon brushes
Take out the carbon brush by first removing the
brush cap and then hooking the protrusion of the
carbon brush with a slotted head screw driver, etc.,
as shown in Fig. 27.
When installing the carbon brush, choose the
direction so that the nail of the carbon brush agrees
with the contact portion outside the brush tube.
Then push it in with a finger as illustrated in Fig.
28. Lastly, install the brush cap.
CAUTION:
Be absolutely sure to insert the nail of the carbon
brush into the contact portion outside the brush
tube. (You can insert whichever one of the two
nails provided.)
Caution must be exercised since any error in this
operation can result in the deformed nail of the
carbon brush and may cause motor trouble at an
early stage.
6. Cleaning on the outside
When the power tool is stained, wipe with a soft
dry cloth or a cloth moistened with soapy water.
Do not use chloric solvents, gasoline or paint thinner,
as they melt plastics.
7. Storage
Store the power tool in a place in which the
temperature is less than 40°C and out of reach of
children.
8. Service parts list
CAUTION
Repair, modification and inspection of Hitachi Power
Tools must be carried out by a 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.
Important notice on the batteries for the Hitachi
cordless power tools
Please always use one of our designated genuine
batteries. We cannot guarantee the safety and
performance of our cordless power tool when
used with batteries other than these designated
by us, or when the battery is disassembled and
modified (such as disassembly and replacement
of cells or other internal parts).
NOTE:
Due to HITACHI's continuing program of research and
development, the specifications herein are subject to
change without prior notice.
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