Maintenance - Makita 3901 Instruction Manual

How to trim wall or ceiling panels
First unplug the tool. Replace the existing cutter blade
with an optional circular saw blade 110 mm in diameter.
Refer to the "Removing or installing the blade" section
which is described later. Remove the rubber facing from
the base. Now the max. depth of cut is 25 mm.
(Fig. 22 & 23)
Set the depth of cut to "MAX". Using the floor or wall as a
guide, trim wall or ceiling panels. Feed in the direction of
the arrow.
Fig. 24: When trimming the wall panels.
Fig. 25: When trimming the ceiling panels.
CAUTION:
• Before trimming the panels, check the wall or ceiling
carefully to avoid cutting the electrical wires, nails or
other foreign materials.
• Always reinstall the rubber facing after trimming the
panels. If cutting slots for biscuits without the rubber
facing installed properly on the tool, the tool might slip
unexpectedly on the workpiece.
Removing or installing the blade (Fig. 26)
To remove the blade, loosen the clamp screw and open
the blade cover. Push the shaft lock and loosen the lock
nut using the lock nut wrench. To install the blade, first
mount the inner flange.
CAUTION:
• When installing the cutter blade, mount the inner flange
with the side marked "22" facing toward you.
• When installing the circular saw blade, mount the inner
flange with the side marked "22" facing toward the tool.
Then mount the blade and the lock nut. Securely tighten
the lock nut using the lock nut wrench. Close the blade
cover and tighten the clamp screw to secure the blace
cover.

MAINTENANCE

CAUTION:
Always be sure that the tool is switched off and
unplugged before carrying out any work on the tool.
Replacement of carbon brushes
(Fig. 27 & 28)
Replace carbon brushes when they are worn down to the
limit mark. Both identical carbon brushes should be
replaced at the same time.
To maintain product safety and reliability, repairs, mainte-
nance or adjustment should be carried out by a Makita
Authorized Service Center.
9