Maintenance - Makita 7104L Instruction Manual

Adjusting indicator plate and
indication plate
The yellow indicator plate and indication plate are fac-
tory adjusted for the standard equipped cutter chain 16.5
mm. If the alignment is off, for some reason, or when
using another size cutter chain, loosen the screws and
adjust the yellow indicator plate and indication plate.
Enlarging hole
1. Transverse (width) enlargement
► Fig.10: 1. Hex bolts 2. Gauge plate 3. Travel dis-
tance (D) 4. Lever (B)
A hole can be enlarged transversely by adjusting the
gauge plate. Max. expansion of hole width is 15 mm.
EXAMPLE When cutting a hole 25 mm wide using a
cutter chain 16.5 mm, proceed as follows:
• Push the lever (B) away from you. Loosen the
hex bolts securing the gauge plate.
• Adjust the gauge plate so that the travel dis-
tance (D) is 8.5 mm; that is, 25 mm - 16.5 mm
= 8.5 mm. Tighten the hex bolts to secure the
gauge plate.
• Cut the first hole with the lever (B) pushed away
from you. Then pull the lever (B) toward you and
cut again to enlarge the hole.
NOTE:
• The gauge plate is factory adjusted for cutting a
hole 30 mm wide.
2. Longitudinal (length) enlargement
Hole length can be determined in three steps shown in
the table below.
Cutter chain position
Original position
No.1 set position
No.2 set position
NOTE:
• A hole a little longer than predetermined may be
cut depending upon the cutter chain tension.
• The adjusting hex bolts are factory adjusted for
cutting holes 90 mm long in the No.1 set posi-
tion and 120 mm long in the No.2 set position.
Push down the right-hand grip while raising the left-
hand grip. Make sure that the adjusting hex bolt slips
into place securely.
► Fig.11: 1. Lever (C)
Loosen the hex nut securing the adjusting hex bolt. Turn
the adjusting hex bolt until the cutter chain reaches the
desired position, then tighten the hex nut.
► Fig.12: 1. Adjusting hex bolt for No. 1 set position
2. Lever (C) 3. Adjusting hex bolt for No. 2
set position
WARNING:
• When using pressure to turn the adjusting
hex bolt or hex nut, be careful not to allow the
adjusting hex bolt to slip off the set position.
Hole length to be cut
52.5 mm
52.5 mm - 105 mm
77.5 mm - 130 mm
7 ENGLISH
To bring the cutter chain back to the perpendicular
(original) position, pull the lever (C) toward you while
pressing down on the right-hand grip and slightly raising
the left-hand grip and move the cutter chain back to its
original position.
When cutting a hole, first use the perpendicular posi-
tion, then No.1 set position and finally No.2 set position.
Always safely hook the tool head back onto the hook
when changing the cutter chain position.
► Fig.13: 1. Original position 2. No.1 set position
3. No.2 set position 4. Indication plate
5. Ruler
When enlarging a hole both transversely and longitudi-
nally, cut the holes in the order indicated from No.(1) to
(6) as shown. This makes for more easy and efficient
hole enlargement.
► Fig.14: 1. Front base
WARNING:
• Never attempt to enlarge a hole with the cut-
ter chain still within the hole. This will cause
unstable and dangerous operation.
• Never angle the cutter chain when cutting the
first hole, or a dangerous kickback may result.
Always have the cutter chain set to the perpen-
dicular position when cutting the first hole.
Lap joints up to 130 mm can be cut with this tool.
► Fig.15
NOTE:
• Lap joints can be cut only on the front (side
away from you) of the workpiece.

MAINTENANCE

CAUTION:
• Always be sure that the tool is switched off and
unplugged before attempting to perform inspec-
tion or maintenance.
• Never use gasoline, benzine, thinner, alcohol
or the like. Discoloration, deformation or cracks
may result.
Replacing carbon brushes
► Fig.16: 1. Limit mark
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.
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.17: 1. Brush holder cap 2. Screwdriver