DeWalt DWP849X-XE Instruction Manual page 8

DO NOT use in the presence of flammable liquids or gases. DO NOT let children come
into contact with the tool. Supervision is required when inexperienced operators use
this tool.
Auxiliary Handle (Fig. 1)
An auxiliary handle is furnished with your tool and can be installed on either side of
the gear case. This handle should be used at all times to maintain complete control of
the tool.
A bale handle is also provided with the DWP849X-XE and can be used in place of the
auxiliary handle.
Variable Speed Trigger Switch (Fig. 1)
These tools are equipped with a variable speed trigger switch that permits speed
control from 0 to 3500 RPM. To turn the tool on, squeeze the trigger switch (C)
shown in Figure 1 until the tool starts to run. The farther you depress the trigger, the
faster it will operate. Releasing the trigger turns the tool off.
Use lower speeds for applying liquid waxes and polishes and higher speeds for
removing dried liquid. Use the highest speed (fully depress trigger) for buffing the car
to a final lustre.
The tool can be locked on for continuous use by squeezing the trigger switch fully and
depressing the lock button shown in Figure 1. Hold the lock button in as you gently
release the trigger switch. The tool will continue to run. To turn the tool off from a
locked-on position, squeeze and release the trigger switch once. Do not unplug the
tool with the switch in the locked-on condition. Make sure the tool is not locked on
when plugging in.
The variable speed trigger switch has a no-volt release function. In the event of a
power outage or other unexpected shut down, the trigger switch needs to be cycled
(depress the trigger switch, release, then depress again) to restart the tool. Do not
unplug the tool with the trigger switch in the locked-on condition. Make sure the tool
is not locked on when plugging in. If the tool is plugged back in with the trigger switch
in the locked-on position, the tool will not run until the trigger switch is cycled as
described above.
NOTE: The trigger switch can only be locked on with the tool running at the maximum
RPM designated by the speed control wheel (A).
Speed Control Wheel (Fig. 1)
The maximum speed of your tool can be changed by rotating the speed control wheel
(A) to the desired setting. The wheel incorporates detents to prevent inadvertent wheel
movement and to facilitate speed selection. For added versatility, the trigger switch
may be locked in its full on position and tool speed changed by means of the speed
control wheel alone.
The electronic speed control not only lets you select the speed to suit the job, but also
helps to maintain that speed as you load the tool by pressing down. It's this feature,
coupled with the variable speed trigger switch, that make this tool such a value.
The speed control wheel can be set for any speed between 600 and 3500 RPM and
the variable speed switch will then control tool speed from zero to the wheel setting.
For example: A control wheel setting of 2200 RPM will allow the variable speed switch
to operate the tool between zero and 2200 RPM, depending on how far the trigger
switch is depressed. A wheel setting of 600 RPM would allow the switch to operate
the tool from zero to 600 RPM.
The electronic speed control feature comes into play whenever the trigger switch is
fully depressed and the tool is running at the selected speed determined by the setting
of the control wheel. As you load the tool by pushing it down on the work surface,
(with the trigger fully depressed) the electronic circuit inside the tool will compensate
for the loading and maintain the selected speed. If the speed selected by the control
wheel is 2200 RPM, as in the example above, the tool will maintain 2200 RPM, as it
is loaded.
It is important to remember two things about electronic speed control:
1. The electronic speed control operates only when the trigger switch is fully
depressed.
2. The effect of electronic speed control is much easier to observe at lower
speed settings (2600 RPM and below), than at high speeds. As the tool
approaches 3000 RPM, the effect is considerably less dramatic.
Keep in mind that, with a conventional polisher running at a typical no-load speed
of 2400 RPM, the tool slows down to about 2000 RPM under a polishing load. Your
DWP849X-XE will continue to run at 2400 RPM (or any speed you select with the
control wheel) as a load is applied. Since it doesn't slow down, the speed may be
greater than you're used to, so some extra caution should be observed until you get
the "feel" of your polisher. If you feel the speed is too great, you can, of course, slow
the tool down with either the trigger switch or the control wheel.
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