Maintenance - Urrea RB1120 Manual Del Usuario

hole. This will prevent the drill bit from slipping
off center as the hole is started.
7. When drilling metals, use light oil on the drill
bit to keep it from overheating.
The oil will prolong the life of the bit and in-
crease the drilling action.
8. If the bit jams in the workpiece or if the drill
stalls, stop the tool immediately.
Remove the bit from the workpiece and deter-
mine the reason for jamming.
WOOD DRILLING
For maximum performance, use high-speed
steel or brad point bits for wood drilling.
1. Begin drilling at a very low speed to prevent
the bit from slipping off the starting point.
2. Increase speed as the drill bit bites into the
material.
3. When drilling "through" holes, place a block
of wood behind the workpiece to prevent
ragged or splintered edges on the back side of
the hole.
METAL DRILLING
For maximum performance, use high-speed
steel bits for metal or steel drilling.
1. When drilling metals, use a light oil on
the drill bit to keep it from overheating.
The oil will prolong the life of the bit and in-
crease the drilling action.
2. Begin drilling at a very low speed to prevent
the bit from slipping off of the starting point.
3. Maintain a speed and pressure that allows
cutting without overheating the bit. Applying
too much pressure will:
- Overheat the hammer drill.
- Wear the bearings.
- Bend or burn bits.
- Produce off-center or irregular-shaped holes.
MASONRY DRILLING
For maximum performance, use high-speed
steel bits for masonry drilling.
1. When drilling in masonry, select the hammer
drill operating mode.
2. Drilling soft masonry materials such as cinder
block requires little pressure.
Hard materials like concrete require more pres-
sure.
3. A smooth, even flow of dust indicates the
proper drilling rate. Do not let the bit spin in
the hole without cutting. Do not use water to
settle dust or to cool bit.
WARNING: Always wear safety goggles or
safety glasses with side shields during power
16
tool operation or when blowing dust. If opera-
tion is dusty, also wear a dust mask.

MAINTENANCE

WARNING: To avoid serious personal injury,
always remove the battery pack from the tool
when cleaning or performing any maintenance.
WARNING: When servicing, use only identi-
cal replacement parts. Use of any other parts
may create a hazard or cause product damage.
WARNING: It is not recommended to use
compressed dry air as cleaning method of the
hammer drill. If cleaning with compressed air is
the only method to apply, always wear safety
goggles or safety glasses with side shields when
using compressed air to clean the tool. If the
operation is dusty, also wear a dust mask.
GENERAL MAINTENANCE
Avoid using solvents when cleaning plastic
parts. Most plastics are susceptible to damage
from various types of commercial solvents. Use
clean cloth to remove dirt, dust, oil, grease, etc.
WARNING: Do not at any time allow brake
fluids, gasoline, petroleumbased products, pen-
etrating oils, etc. to come in contact with plastic
parts.
Chemicals can damage, weaken or destroy plas-
tic which may result in serious personal injury.
WARNING: When servicing, use only identi-
cal replacement parts. Use of any other parts
may create a hazard or cause product damage.
To ensure safety and reliability, all repairs should
be performed by a qualified service technician.
CHUCK REMOVAL (FIG. 13)
The chuck can be removed and replaced with a
new one.
1. Lock the
trigger switch
by placing the
d i r e c t i o n - o f -
rotation selector
in the center
position.
2. Open the
chuck jaws. Us-
ing a screwdriver,
remove the chuck screw by turning it clockwise,
3. Insert a 5/16-in. or larger hex key into the
chuck of the hammer drill and tighten the chuck
jaws securely.