6
OPERATION
WARNING
To reduce the risk of injury, always
unplug tool before attaching or
removing accessories or making adjustments.
Use only specifically recommended accessories.
Others may be hazardous.
Always wear proper eye protection marked to
comply with ANSI Z87.1.
When working in dusty situations, wear appro-
priate respiratory protection or use an OSHA
compliant dust extraction solution.
Keep hands and cord away from the bit and all
moving parts.
Always use a side handle when using this tool.
Always brace or hold securely.
Cut embedded rebar only if this operation does
not affect the integrity of the building. If in doubt,
consult a structural engineer. Tool operator fully
responsible for adverse structural effects.
Electronic Feedback Control Circuit
These hammers have an Electronic Feedback Con-
trol Circuit (EFCC) which helps improve the operation
and life of the tool.
Feedback Control
The electronic speed control circuit allows the tool to
maintain constant speed and torque between no-load
and load conditions.
Soft Start
The Soft-Start feature reduces the amount of torque
reaction to the tool and the user. This feature gradu
-
ally increases the motor speed up from zero to the
speed set by the speed control dial.
Selecting Speed
The speed control dial on these hammers allows
the user to adjust the rotating speed (RPM) and the
impact rate (BPM) of the tool.
To change the speed, set the speed control dial to
the desired setting.
• Lower speeds provide more control when starting
holes and reduce 'spalling' on breakthrough. Spall
-
ing occurs when pieces of material chip off around
the drilled hole on breakthrough. When chiseling in
soft or brittle materials, use lower speeds to reduce
damage to surrounding areas of the material.
• Higher speeds provide faster penetration when
drilling and chiseling in demolition work.
Selecting Action
Cat. No. 5337-20
The cat. no. 5337-20 demolition hammer is for
"hammering-only". No rotation is available. Only
chisels and other "hammering-only" accessories
should be used.
Cat. No. 5339-20
The cat. no. 5339-20 demolition ham-mer is for
"hammering-only". No rotation is available. The ac
-
tion selector is used to select the action:
1.
Hammering only.
For use with
Hammering
Only
"hammering only" accessories.
Use this setting for chiseling.
2.
Chisel adjustment.
Use this
setting to adjust the angle of the
chisel blade in relation to the tool.
With a chisel mounted in the tool,
twist the chisel to the desired
angle. Then, rotate the action
selector to the "hammering only"
setting for use.
NOTE:
To engage the hammering
Chisel
Adjustment
mechanism, maintain pressure on
the bit/chisel. When pressure is
released, hammering stops.
Cat. No. 5340-20
The cat. no. 5340-20 rotary hammer has "hammer
-
ing-only" and "hammering with rotation", depending
on the type of shank inserted into the tool.
For
"hammering-only":
Insert a chisel or other
"hammering-only" accessory with a 3/4" Hex with
21/32" Round
shank into the nose of the tool (see
"Inserting Bits and Chisels"). The rotational drive
mechanism will run but not engage with the chisel,
resulting in "hammering-only" action.
For
"hammering with rotation"
: Insert a drill or
coring bit with a spline shank into the nose of the
tool (see "Inserting Bits and Chisels"). The rotational
drive mechanism engages with the bit, resulting in
"hammering with rotation" action.
Cat. No. 5342-20
Cat. no. 5342-20 rotary hammer has "hammering-
only", "hammering with rotation", and "chisel adjust
-
ment" settings. The action selector is used to select
the action:
Hammering
Only
Chisel
Adjustment
Hammering
with Rotation
1.
Hammering only.
For use with "hammering only"
accessories. Use this setting for chiseling.
2.
Hammering with rotation.
Use this setting
for drilling holes with drill bits. Do not use "ham
-
mering with rotation" when using chisels or other
"hammering-only" accessories.
3.
Chisel adjustment.
Use this setting to adjust
the angle of the chisel blade in relation to the tool.
With a chisel mounted in the tool, twist the chisel to
the desired angle. Then, rotate the action selector
to the Hammering only setting for use.
NOTE:
To engage the hammering mechanism,
maintain pressure on the bit/chisel. When pressure
is released, hammering stops.
