Maintenance - Urrea TE812A Manual De Usuario

WARNING: Be prepared for binding and bit
breakthrough. When these situations occur,
the drill bit has a tendency to grab the work-
piece. This action will kick the drill opposite to
the direction of the drill bit rotation and could
cause loss of control when breaking through
material as you complete drilling the hole. If
you are not prepared, this loss of control can
result in possible serious injury.
When drilling metals, use a light oil on the drill
bit to keep it from overheating. The oil will
prolong the life of the drill bit and improve the
drill cutting action. If the bit jams in the work-
piece or if the drill stalls, release the switch
trigger immediately.
Remove the bit from the workpiece and deter-
mine the reason for jamming.
DRIVING SCREWS
When driving screws, care must be taken to
use the bit that correctly fits the screw being
driven.
Make sure you use the largest bit size that will
properly fit into the head of the screw.
1. Select the correct screwdriver bit for the
screw being driven.
2. Fasten the screwdriver bit into the chuck,
making sure the flats of the bit are gripped by
the chuck jaws.
NOTES:
a) If the material is particularly soft or porous,
run the drill at slower speeds to avoid over-
driving the screw.
b) Hold the drill firmly with both hands while
driving screws to avoid loss of control.
CHUCK REMOVAL
The drill chuck must be removed in order to
use some accessories. To remove the chuck:
1. Remove the drill plug from the power
source.
2. Insert a 5/16" or larger
hex key (1) into the chuck
(2) and tighten the chuck
jaws securely. Make sure
each of the three chuck
jaws (3) is seated on the
flat surfaces of the hex key
(fig. 9).
14
3. Tap the hex key sharply with a mallet (4) in
a CLOCKWISE direction. This action will loosen
the screw in the chuck for easy removal.
4. Open the chuck jaws and remove the hex
key.
5. Open the chuck jaws as
far as possible.
6. Remove the chuck screw
using a #2 screwdriver (fig.
10).
NOTE: Turn screw CLOCKWISE to remove it.
This screw has a left hand thread.
7. Insert the hex key into
the chuck and tighten the
jaws of the chuck securely
(fig. 11). Tap the hex key
sharply with a mallet in
a COUNTER-CLOCKWISE
direction.
This will loosen the chuck on the spindle. The
chuck can now be unscrewed and removed
from the spindle by hand.
RETIGHTENING A LOOSE CHUCK
After installing the chuck once it has been
removed, the chuck may become loose on the
spindle and develop a wobble. Also, the chuck
screw may become loose, causing the chuck
jaws to bind and prevent them from closing.
To tighten the chuck, follow these steps:
1. Insert the hex key into the chuck and tighten
the chuck securely.
2. Tap the hex key sharply with a mallet in a
CLOCKWISE direction (fig. 9). This will tighten
the chuck on the spindle.
3. Open the chuck jaws and remove the hex
key.
4. Tighten the chuck screw using a #2 screw-
driver.
NOTE: Turn the screw COUNTERCLOCKWISE to
tighten it. This screw has a left hand thread.

MAINTENANCE

Fig.9
REPLACING CARBON MOTOR BRUSHES
The carbon motor brushes will wear down and
require replacing. The time intervals between
replacements will vary depending upon the
working environment and the hours of use. It
is recommended that the brushes be checked
after each 10 hours of use. When the length of
Fig.10
Fig.11