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Makita HM 1140C Manual

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6
Switch action (Fig.5)
CAUTION:
Before plugging in the machine, always check to see that
the machine is switched off.
To start the machine, push the “ON I” button on the left
side of the machine. To stop the machine, push the “OFF
O” button on the right side of the machine.
Speed change (Fig. 6)
The blows per minute can be adjusted between 1,300
and 2,650 BPM just by turning the adjusting dial. This
can be done even while the machine is running. The dial
is marked 1 (lowest speed) to 5 (full speed). Refer to the
table below for the relationship between the number set-
tings on the adjusting dial and the blows per minute.
Chipping / Scaling / Demolition (Fig. 7)
Hold the machine firmly with both hands. Turn the
machine on and apply slight pressure on the machine so
that the machine will not bounce around, uncontrolled.
Pressing very hard on the machine will not increase the
efficiency.
MAINTENANCE
CAUTION:
Always be sure that the machine is switched off and
unplugged before carrying out any work on the machine.
Replacement of carbon brushes (Fig. 8 & 9)
Whenever carbon brushes must be replaced, they cut out
the machine automatically. When this occurs, loosen the
screws which secure the rear cover. Pry up the rear
cover with a screwdriver and remove it. Then replace
both carbon brushes at the same time. Use only identical
carbon brushes.
Lubrication (Fig. 10 & 11)
This machine requires no hourly or daily lubrication
because it has a grease-packed lubrication system.
Lubricate the machine every time the carbon brushes are
replaced.
Run the machine for several minutes to warm it up.
Switch off and unplug the machine. Remove the crank
cap using a socket wrench. Rest the machine 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
(30 g). Use only Makita genuine grease (optional acces-
sory). Filling with more than the specified amount of
grease (approx. 30 g) can cause faulty hammering action
or machine failure. Fill only with the specified amount of
grease. Reinstall the crank cap and tighten with the
socket wrench. Do not tighten the crank cap excessively.
It is made of resin and is subject to breakage.
To maintain product safety and reliability, repairs, mainte-
nance or adjustment should be carried out by Makita
Authorized Service Center.
Number on adjusting dial Blows per minute
5 2,650
4 2,350
3 1,950
2 1,550
1 1,300
… 6 …


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