Troubleshooting - Makita DUP180 Instruction Manual

Adjusting shear blades tension
NOTICE:
Adjust the tension on your shear
blades properly. Too loose tension may result
in dull cut, and too tight tension may result in
overload for the motor and short running time of
the tool.
Adjust the tension on shear blades as follows:
1.
Loosen the bolt with the hex wrench, and then
remove it.
► Fig.28: 1. Bolt
NOTICE:
Do not loosen the nut before loosening
the bolt. Otherwise, the nut may be damaged.
2. Loosen the nut with the box wrench, and then
tighten it manually.
► Fig.29: 1. Nut
NOTICE:
The recommended tightening torque is
approximately 0.5 N•m.
3. Attach the bolt to the tool and tighten it with the
hex wrench.
► Fig.30: 1. Bolt
4.
Check that there is no gap between the upper
shear blade and lower shear blade.
► Fig.31
Check that the upper shear blade moves approximately
3 mm toward the lower shear blade.
► Fig.32: 1. Upper shear blade

TROUBLESHOOTING

Before asking for repairs, conduct your own inspection first. If you find a problem that is not explained in the manual,
do not attempt to dismantle the tool. Instead, ask Makita Authorized Service Centers, always using Makita replace-
ment parts for repairs.
State of abnormality
The shear blade does not move even
after pulling the switch trigger.
The shear blades are stuck on the
branch.
The cut is not smooth.
Probable cause (malfunction)
The battery is low.
The tool is turned off.
The switch trigger is defective.
The branch is too thick or too hard.
The shear blades are dull.
The shear blades are worn out.
15 ENGLISH
Grinding the shear blades
NOTE: When grinding the shear blades, adding water
to the grinding stone will make the grinding smoother.
After the grinding, be sure to wipe off the shear
blades with a dry cloth.
Turn off the tool and remove the battery cartridge, and
remove the shear blades from the tool.
Upper shear blade
1.
Grind the upper shear blade with the grinding
stone as shown in the figure.
► Fig.33: 1. Upper shear blade 2. Grinding stone
2. Remove the burrs from the back side of the shear blade
by lightly applying the grinding stone to the shear blade.
► Fig.34: 1. Grinding stone
Lower shear blade
1. Grind the lower shear blade with the grinding stone
in the direction of the arrow as shown in the figure.
► Fig.35: 1. Grinding stone 2. Lower shear blade
2. Remove the burrs from the back side of the shear blade
by lightly applying the grinding stone to the shear blade.
► Fig.36: 1. Grinding stone
NOTICE:
When sharpening the back side of
shear blade, lightly apply the grinding stone,
and do not sharpen the shear blade too much.
Otherwise, the clearance between the upper blade
and lower blade edges may become too much, or the
life of shear blade may be shortened.
• After installing the shear blades, adjust the tension
on shear blades by referring to the section for
adjusting shear blades tension.
• After installing the shear blades, apply oil to the
shear blades by referring to the section for shear
blade maintenance.
• After installing the shear blades, adjust the cutting
depth by referring to the section for cutting depth
adjustment.
Remedy
Charge the battery.
Turn on the tool.
Stop using the tool immediately, and ask your local
authorized service center for repair.
Release the switch trigger and turn off the tool.
Then pull the shear blades straight out slowly from
the branch.
Sharpen the shear blades, and adjust the blade
clearance, and perform cutting depth adjustment.
Replace the shear blades.