Milwaukee 5337-20, 5337-21 Manual Del Operador página 8

Cold Hammering
If the hammer is stored for a long period of time or at cold temperatures,
the lubrication may become stiff and the tool may not hammer initially or
the hammering may be weak. If this happens:
1. Insert a chisel into the tool.
2. Pull the trigger and apply the chisel against a scrap piece of con-
crete.
3. Turn the tool On and Off every few seconds. After 15 seconds to 2
minutes, the tool will start hammering normally. The colder the hammer
is, the longer it will take to warm up.
Operator Force
These hammers feature the Vibration Isolation System to provide the opera-
tor with comfort without sacrificing power or performance. The motor housing
is suspended independently from the switch handle. Insulating elements
absorb vibration when hammering and drilling.
Ideal operator force compresses the handle slightly and allows the tool to
work aggressively while the handle provides maximum vibration dampen-
ing.
Excessive operator force compresses the handle too far and reduces the
vibration dampening. Users will be able to feel the difference and should
adjust the force to the handle accordingly.
Applying greater pressure does not increase the tool's effec-
tiveness. If the applied working pressure is too high, the shock
absorber will be pushed together making vibration to the handle
noticeably stronger.
Hammering Only
1. Insert a chisel or other "hammering only" accessory into the tool (see
"Installing Bits and Chisels").
2. Position the tool on the workpiece.
3. Grasp both handles firmly (trigger handle and either the spade handle
or straight handle).
4. Pull the trigger. Always hold the tool securely using two handles and
maintain control.
5. Use only enough pressure to hold the tool in place, engage the ham-
mering mechanism, and prevent the tip of the chisel from wandering.
This tool has been designed to achieve top performance with only
moderate pressure. Let the tool do the work.
NOTE: To engage the hammering mechanism, maintain pressure on
the bit/chisel. When pressure is released, hammering stops.
6. When chiseling or chipping, hold the tool at an angle to the work area.
For best performance, work from a corner or close the edge of the work
and break off a small area at a time.
If a hammer iron gets stuck:
1. Unplug the tool.
2. Pull out bit lock and rotate it 180°.
3. Pull the tool off of the stuck accessory.
4. Remove the accessory from the workpiece.
Hammering with Rotation
1. Insert a drill or coring bit into the tool (see "Installing Bits and Chis-
els").
2. Position the tool on the workpiece.
3. Grasp both handles firmly (trigger handle and straight handle).
page 
Warning
To reduce the risk of injury, hold or brace securely. Always be
prepared for drill reaction when bit binds, when hole becomes
clogged, when striking embedded materials, and during hole
breakthrough.
4. Pull the trigger. Always hold the tool securely using the straight handle
and trigger handle and maintain control.
5. Use only enough pressure to hold the tool in place, engage the ham-
mering mechanism, and prevent the tip of the bit from wandering. This
tool has been designed to achieve top performance with only moderate
pressure. Let the tool do the work.
When pressure is released, hammering stops.
6. When drilling deep holes, the speed may begin to drop off. Pull the bit
partially out of the hole while the tool is running to help clear dust.
NOTE: Do not use water to settle the dust since it will clog the bit flutes
and tend to make the bit bind in the hole.
If a bit binds:
If the bit should bind, a built in, nonadjustable slip clutch prevents the bit
from turning when the tool is held or braced securely. If this occurs
1. Turn off and unplug the tool.
2. Free the bit from the workpiece.
3. Clear debris from the hole.
4. Begin drilling again.
Use milWaukee core bits Cat. No. 48-20-5125 through 48-20-5165.
Do not use LHS (Large Hole System) Components with rotary ham-
mers 5340-20 and 5342-20. The bits could fail, breaking apart at the
threaded stud and causing injury and property damage.
Using Rotary Percussion Core Bits (Fig. 5 - 7)
Core bits are useful for drilling larger holes for conduit and pipe.
MILWAUKEE Heavy-Duty Core Bits have heat-treated steel bodies with
durable carbide tips. These core bits are specially designed for fast, accurate
drilling with combined hammering and rotary action.
1. Clean and lubricate the threads on the adapter and core bit to make
later removal easier. Screw the threaded end of the adapter into the
rear of the core bit.
2. Push the guide plate onto the pointed end of the center pin. Insert the
center pin and guide plate assembly into the core bit. Be sure the small
end of the center pin is securely placed into the hole in the center of
the core bit (Fig. 5).
Fig. 5
3. Insert the adapter into the nose of the tool (see "Installing Bits and
Chisels". Set the action selector to the hammering-with-rotation
setting.
Warning
Warning