Soft Start Feature; Mode Selector - DeWalt DW531 Instruction Manual

154728-01 rev 9/10/02 2:23 PM
Soft Start Feature (DW541, DW532,
DW533, DW545)
The soft start feature allows you to build up speed slowly, thus
preventing the drill bit from walking off the intended hole position
when starting. The soft start feature also reduces the immediate
torque reaction transmitted to the gearing and the operator if the
hammer is started with the drill bit in an existing hole.
Torque Limiting Clutch
All rotary hammers are equipped with a torque limiting clutch that
reduces the maximum torque reaction transmitted to the operator in
the case of a jamming drill bit. This feature also prevents the gearing
and motor from stalling. The torque limiting clutch has been factory
set and cannot be adjusted.
Electronic Speed and Impact Control
(DW541, DW532, DW533, DW545)
(Fig. 5) The electronic speed and impact control allows the use of
smaller drill bits without the risk of bit breakage, drilling into light and
brittle materials without shattering, and optimal tool control for
precise chiseling. To set the control dial: Turn the dial to the desired
level. The higher the number, the greater the speed and impact
energy. With dial settings from "1" to "5" (full power) the tool is
extremely flexible and adaptable for many different applications. The
required setting depends on the bit size and hardness of material
being drilled.
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Mode Selector

(Fig. 6) Your rotary hammer (all units except DW530) can be used in
two operating modes: Hammer drilling (simultaneous rotating and
impacting for all concrete and masonry drilling operations) and
Hammering only with spindle lock (impacting only- for light
chipping, chiseling, and demolition applications. The chisel can be
locked into 8 different positions.
NOTE: Also in this mode, the hammer can also be used as a lever to
free a jammed drill bit.
To select the required operating mode, rotate the selector lever
over the safety lock until it covers the symbol.
SERVICE AND POWER INDICATOR LEDS (DW541, DW532,
DW533, DW545)
(Fig. 5) The RED service indicator LED lights up when the carbon
brushes are nearly worn out to indicate that the tool needs servicing.
After approximately 8 hours of use the motor will automatically be
shut off. Take the tool to a D
inspection and maintenance.
The GREEN power-ON indicator LED lights up when the tool is
switched ON. If the indicator LED is lit but the tool does not start, this
indicates a motor related problem. If the indicator LED does not light
up and the tool does not start, this indicates an ON/OFF switch or
cord related problem.
DRILLING WITH A SOLID BIT
1. Set the speed and impact control dial (DW541, DW532, DW533,
DW545).
2. Set the model selector to the "hammer drilling" position (for all
units except DW530).
3. Insert the appropriate drill bit.
4. Fit and adjust the side handle.
5. If necessary, set the drilling depth rod.
5
WALT service location for routine
E