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About the Protection Function
This tool has a built-in protection circuit for preventing
damage to the unit in the event of an abnormality.
Depending on the nature of the abnormality, the display
lamp will flash as shown in Table 1 and the unit will cease
to operate. In such cases, verify the problem indicated
by the flashing and take whatever steps are necessary to
correct the problem.
NOTE
Repair may be required if the display lamp continues
to flash after taking all necessary steps to correct the
problem. If the problem persists, please arrange for
repairs.
Table 1
Display
lamp
Cause
flashing
Internal temperature
has risen beyond
the unit's specified
Flash
temperature.
(Temperature
increase protection
function)
Excessive pressure
applied to the tool
Flash
has resulted in an
overload.
(Overload
protection function)
Tool is connected
to a power source
Flash
whose voltage is
either too high or
too low.
(Circuit protection
function)
Sensor signal read
Flash
error.
(Control monitoring
function)
0000Book_BMH40-BL_Wuerth.indb
Solution
Turn off the unit and
allow it to cool down
for about 15 minutes.
When the temperature
goes down, the display
lamp will stop flashing
and remain lit to
indicate that the unit is
ready for use.
Press the rotation
speed selector switch
to recover. Try to avoid
tasks that will apply
excess pressure to the
unit.
Connect the unit to a
power supply matching
the input voltage
specified on the
nameplate. Press the
rotation speed selector
switch to recover.
Press the rotation
speed selector switch
to recover. Repair may
be required if this error
continuously occurs.
15
Grease Replacement
This Rotary Hammer is of full air-tight construction to protect
against dust and to prevent lubricant leakage. Therefore,
this Rotary Hammer can be used without lubrication for
long periods. Replace the grease as described below.
Grease Replacement Period
After purchase, replace grease after every 6 months of
usage. Ask for grease replacement at the nearest
authorized Service Center.
Maintenance and Inspection
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.
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.
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.
Replacing supply cord
If the replacement of the supply cord is necessary, this
has to be done by the manufacturer of this agent in
order to avoid a safety hazard.
CAUTION
In the operation and maintenance of power tools, the
safety regulations and standards prescribed in each
country must be observed.
Warranty
For this Würth tool, we provide a warranty in accordance
with statutory/country-specific regulations from the date
of purchase (proof of purchase by invoice or delivery
note). Damage that has occurred will be corrected by
replacement or repair. Damage caused by normal wear,
overloading or improper handling is excluded from the
warranty.
Claims can be accepted only when the machine is
presented undisassembled to a Würth branch office, your
Würth sales representative or a customer service agent for
Würth pessure air and power tools.
15
2019/03/20
14:51:57
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