Makita HR3520B Betriebsanleitung Seite 7

NOTE:
• No problem is caused even if the core bit unscrews
slightly during brief use since the core bit rotates in the
tightening direction.
To remove the core bit, follow the same removal proce-
dures covered in "When using the center bit".
MAINTENANCE
CAUTION:
• Always be sure that the tool is switched off and
unplugged before attempting to perform inspection or
maintenance.
• Never use gasoline, benzine, thinner, alcohol or the
like. Discoloration, deformation or cracks may result.
Replacing carbon brushes (Fig. 18, 19 & 20)
When the resin insulating tip inside the carbon brush is
exposed to contact the commutator, it will automatically
shut off the motor. When this occurs, both carbon
brushes should be replaced. Keep the carbon brushes
clean and free to slip in the holders. Both carbon brushes
should be replaced at the same time. Use only identical
carbon brushes.
Use a hex wrench to remove the rear cover.
Use a screwdriver to remove the brush holder caps. Take
out the worn carbon brushes, insert the new ones and
secure the brush holder caps.
Lubrication (Fig. 21 & 22)
This tool requires no hourly or daily lubrication because it
has a grease-packed lubrication system. It should be
relubricated after every 6 months of operation. Send the
complete tool to Makita Authorized or Factory Service
Center for this lubrication service. However, if circum-
stances require that you should lubricate it by yourself,
proceed as follows.
Run the tool for several minutes to warm it up. Switch off
and unplug the tool.
Remove the crank cap using a Makita lock nut wrench 35
(optional accessory). Rest the tool on the table with the
bit end pointing upwards. This will allow the old grease to
collect inside the crank housing.
Wipe out the old grease inside and replace with a fresh
grease (60 g). Use only Makita genuine hammer grease
(optional accessory). Filling with more than the specified
amount of grease (approx. 60 g) can cause faulty ham-
mering action or tool failure. Fill only with the specified
amount of grease.
Reinstall the crank cap and tighten with the lock nut
wrench.
CAUTION:
• Do not tighten the crank cap excessively. It is made of
resin and is subject to breakage.
To maintain product SAFETY and RELIABILITY, repairs,
any other maintenance or adjustment should be per-
formed by Makita Authorized Service Centers, always
using Makita replacement parts.
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OPTIONAL ACCESSORIES
CAUTION:
• These accessories or attachments are recommended
for use with your Makita tool specified in this manual.
The use of any other accessories or attachments might
present a risk of injury to persons. Only use accessory
or attachment for its stated purpose.
If you need any assistance for more details regarding
these accessories, ask your local Makita service center.
• Tungsten carbide-tipped drill bit
• Bull point
• Cold chisel
• Scaling chisel
• Clay spade
• Grooving chisel
• Rammer
• Bushing tool
• Hexagonal shank to various-Taper adapters
• Core bit
• Center bit
• Rod
• Core bit adapter
• Cotter (Drift key)
• Hammer grease
• Ground rod adapter
• Bit grease
• Blow-out bulb
• Lock nut wrench 35
NOTE:
• Some items in the list may be included in the tool pack-
age as standard accessories. They may differ from
country to country.
Noise
The typical A-weighted noise level determined according
to EN60745:
Model HR3850K
Sound pressure level (L
Sound power level (L
Uncertainty (K): 3 dB (A)
Wear ear protection
Vibration
The vibration total value (tri-axial vector sum) determined
according to EN60745:
Model HR3850K
Work mode: hammer drilling into concrete
Vibration emission (a
Uncertainty (K): 1.5 m/s
Work mode: chiseling
Vibration emission (a
Uncertainty (K): 1.5 m/s
ENG905-1
): 101 dB (A)
pA
): 112 dB (A)
wA
ENG900-1
2
): 19.0 m/s
h,HD
2
2
): 13.5 m/s
h,CHeq
2
7