DeWalt dc900 Instruction Manual page 31

● To select the screwdriving mode, align the collar
(5) with the symbol (16) on the housing.
● To select the rotary drilling mode, align the
collar (5) with the symbol (17) on the housing.
● To select the percussion drilling mode, fi rst
select the rotary drilling mode and then align the
symbol on the collar (4) with the indicator (18) on
the collar (5).
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Do not select the operating mode when
the tool is running.
Adjusting the torque (fi g. D)
The collar of this tool has a wide range of positions
for the adjustment of the torque to suit the size of
the screw and the workpiece material. For torque
adjustment, refer to the section "Screwdriving".
● Select the torque by aligning the symbol or
number on the collar (4) with the indicator (18)
on the collar (5).
Forward/reverse slider (fi g. E)
● To select forward or reverse rotation, use the
forward/reverse slider (2) as shown (see arrows
on tool).
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Always wait until the motor has come to
a complete standstill before changing
the direction of rotation.
Three-gear selector (fi g. F)
Your tool is fi tted with a three-gear selector (6) to
vary the speed/torque ratio.
1 low speed/high torque
2 medium speed/medium torque
3 high speed/low torque
For speed rates, refer to the technical data.
● Do not change gears at full speed or during
use.
Instructions for use
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● Always observe the safety instructions
and applicable regulations.
● Be aware of the location of pipework
and wiring.
● Apply only a gentle pressure to the tool.
Excessive force does not speed up
drilling but decreases tool performance
and may shorten tool life.
Prior to operation:
● Make sure your battery pack is (fully) charged.
● Make sure the battery pack is properly seated.
● Insert the appropriate bit.
● Mark the spot where the hole is to be drilled.
Switching on and off (fi g. A & E)
● To run the tool, press the variable speed switch
(1). The pressure exerted on the variable speed
switch determines the tool speed.
● To stop the tool, release the switch.
● To lock the tool in the off position, move the
forward/reverse slider (2) to the central position.
Screwdriving (fi g. A)
● Select the drilling mode using the collar (5).
● Select forward or reverse rotation using the
slider (2).
● Set the collar (4) to position 1 and begin
screwdriving (low torque).
● If the clutch ratchets too soon, adjust the collar
to increase the torque as required.
Drilling (fi g. A)
● Select the drilling mode using the collar (5).
● Select forward rotation using the slider (2).
Drilling in metal
● Use a cutting lubricant when drilling metals.
The exceptions are cast iron and brass which
should be drilled dry.
Drilling in wood
● Use the appropriate type of drill bit.
Consult your dealer for further information on the
appropriate accessories.
Maintenance
Your D WALT power tool has been designed to
E
operate over a long period of time with a minimum
of maintenance. Continuous satisfactory operation
depends upon proper tool care and regular
cleaning.
E N G L I S H
31