Maintenance - Makita 5012B Instruction Manual

of about 200 mm. For greater thicknesses, depress
plunger several times at some point in the cutting (after
switching off the saw, of course). Failure to oil saw this
much may result in damage to your saw chain. Better to
use too much oil than ruin a chain. (Fig. 8)
Insufficient oiling will cause wear on the rivets, rough
chain travel and high chain tension. Use in such
conditions will put a great load on the motor, and the
overload protector may cut in. Unplug the saw and pump
the oil plunger 5 or 6 times while running the saw chain
around by hand. After enough lubrication, resume sawing
operations.
Recommended oil
A special oil or one of high viscosity is neither needed nor
advisable, since the aim is to lubricate the chain and bar.
Turbine oil #200 or machine oil is recommended. When
filling the tank, be careful not to let any dirt or foreign
matter in. (Fig. 9)
Remove the cap on the oil inlet and fill tank with oil using
the oil supply provided. Check the oil level through the oil
tank inspection window. (Fig. 10)
Switch action
To start the tool, simply pull the trigger. Release the
trigger to stop. (Fig. 11)
CAUTION:
Before plugging in the tool, always check to see that the
trigger switch actuates properly and returns to the "OFF"
position when released.
When cutting with chain saw
Do not force the cut by pressing down hard. Pressure will
not speed the cutting action. Resting the saw on the
bucking spike in front as a fulcrum will cause the chain
speed to slow down and at the same time increase the
electrical load. In this or a similar condition, the overload
protector will cut in to stop the motor, thus preventing
overheating. (Fig. 12)
If you notice that the overload protector has cut in, switch
off the saw. Then check the chain tension and check your
sawing method before pressing the overload protector to
begin sawing again. (Fig. 13)

MAINTENANCE

CAUTION:
Always be sure that the tool is switched off and unplugged
before attempting to perform inspection or maintenance.
Filing saw chain
To get the most in cutting performance from your tool, you
must keep the cutters sharp and filed properly. (Fig. 14)
To file the saw chain, push the file in the direction of the
arrow. When pulling it back, be careful not to touch the
cutters with the file. (Fig. 15)
After a saw chain has been filed two or three times, the
"raker" (see Fig. 14) may need to be filed down slightly.
This is because the raker acts as a depth gauge for the
cutters. As the cutters are filed, they lose some height due
to their angled shape. Eventually, the cutters will become
lower than the depth gauge and consequently, will not be
able to cut. To remedy this, use a flat file to file the tops of
the rakers so that they are about 0.5 mm below the tips of
the cutters (see Fig. 14). Be careful not to file the rakers
excessively or the cutters will be allowed to take too large
of a "bite", causing the tool to stall or snag in the cut.
Removing chip buildup
Chips and sawdust will build up in the guide bar groove
and oil hole, clogging them and impairing oil flow. Remove
the guide bar and clean them out. (Fig. 16 & 17)
Replacing carbon brushes
Remove and check the carbon brushes regularly. Replace
when they wear down to the limit mark. 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. (Fig. 18)
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. (Fig. 19)
To maintain product SAFETY and RELIABILITY, repairs,
any other maintenance or adjustment should be
performed by Makita Authorized or Factory Service
Centers, always using Makita replacement parts.
7