How To Replace Grease; Maintenance And Inspection - Hitachi DH 38MS Instrucciones De Manejo

English
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. 13)
Before that, feed oil to the screw portion of core bit
shank for easy dismounting.
(2) Mount the core bit shank on the main body in the same
manner as in mounting the drill bit and the bull point.
(Fig. 14)
(3) Insert the center 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. 15)
2. Drilling holes
(1) Insert the plug into a receptacle.
(2) A spring is built in the center 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. (Fig. 16)
(3) When the hole depth reaches approximately 5 mm,
the hole position can be determined. Then remove the
center 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 receptacle.
3. How to dismount the core bit
○ By holding the rotary hammer (with the core bit inserted)
in an upward position, drive the rotary hammer to repeat
impact operation two or three times, whereby the screw
is loosened and the rotary hammer becomes ready for
disassembly. (Fig. 17)
○ Remove the core bit shank from the rotary hammer,
hold the core bit with one hand, and strongly strike the
head of the SDS max shank portion of the core bit shank
with a manual hammer two or three times, whereby the
round head screw is loosened and the rotary hammer is
ready for disassembly. (Fig. 18)

HOW TO REPLACE GREASE

This machine is of full air-tight construction to protect
against dust and to prevent lubricant leakage. Therefore,
the machine can be used without lubrication for long
periods. Replace the grease as described below.
1. Grease replacement period
After purchase, replace grease after every 6 months
of usage. Ask for grease replacement at the nearest
Hitachi Authorized Service Center. Proceed for
replacement of grease.
2. Grease replenishment
CAUTION
Before replenishing the grease, turn the power off and
pull out the power plug.
(1) Remove the crank cover and wipe off the grease inside.
(Fig. 19)
(2) Supply 60 g of Hitachi Electric Hammer Grease A
(Standard accessory, contained in tube) to the crank
case.
(3) After replenishing the grease, install the crank cover
securely.
NOTE
The Hitachi Electric Hammer Grease A is of the low
viscosity type. If necessary purchase from a Hitachi
Authorized Service Center.
10

MAINTENANCE AND INSPECTION

1. Inspecting the tool
Since use of a dull tool will degrade effi ciency 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. 20)
The Motor employs carbon brushes which are
consumable parts. When they become worn to or near
the "wear limit", it could result in motor trouble. When
an auto-stop carbon brush is equipped, the motor will
stop automatically. At that time, replace both carbon
brushes with new ones which have the same carbon
brush Numbers shown in the fi gure. In addition, always
keep carbon brushes clean and ensure that they slide
freely within the brush holders.
5. Replacing carbon brushes
Loosen the two set screws and remove the tail cover.
Remove the brush caps and carbon brushes. After
replacing the carbon brushes, tighten the brush
caps securely and install the tail cover with securely
tightening two set screws.
6. Service parts list
CAUTION
Repair, modifi cation 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 modifi ed to incorporate the latest technological
advancements.
Accordingly, some parts may be changed without prior
notice.
NOTE
Due HITACHI's continuing program of research and
development, the specifi cations herein are subject to
change without prior notice.