DeWalt DW890 Guide D'utilisation page 5

DW890/384122 11/22/04 7:32 AM
LOWER
SURFACE OF
SIDE BLADES
BLADE
OPENING
Switch
To start tool, depress trigger switch. To stop tool, release the trigger.
To lock the trigger in the on position for continuous operation ,
depress trigger, push up the lock button (Figure 1), and gently
release the trigger. To release the locking mechanism, depress the
trigger fully, then release it. Before using the tool each time, be sure
that the lock button release mechanism is working freely. Be sure to
release the switch lock button before disconnecting the plug from
the power supply. Failure to do so will cause the tool to start
immediately the next time it is plugged in. Damage or injury could
result. The variable speed trigger switch permits speed control.
The farther the trigger is depressed, the higher the speed of the
shear.
Disassembly and Assembly (Figures 2
and 3)
To remove shear head from motor , loosen 3 cap screws. Remove
shear head by pulling head firmly forward. Slight twisting action may
be required if head does not slide off easily.
To remove cutter blades from shear head , remove 3 cap screws
from shear housing. Be careful not to lose rear spacer bushing when
removing middle cap screw. Remove center blade from housing by
Page 3
FIG. 4
SHEET METAL
tapping blade gently towards the rear. Side knife and side spacer will
now drop out of the housing.
To remove eccentric bearing assembly from shaft , use an
appropriate wrench to
counterclockwise.
To install eccentric bearing assembly onto shaft, make sure the
large thin washer is first inserted over shaft. Screw eccentric bearing
assembly onto shaft and tighten with appropriate wrench. Lubricate
bearing with a good grade of bearing grease.
To install cutter blades into shear housing, place the side knife
and side spacer into position in the shear housing. Insert center cap
screw through side knife and side spacer with rear spacer bushing
between them. Start cap screw into thread just enough to hold blades
in place. DO NOT TIGHTEN. Insert spacer bushing into hole in center
blade and lubricate. Install center blade into shear housing by tapping
blade gently forward using a drift to line up hole in center blade with
forward holes in housing. Insert and tighten forward cap screw
making sure spacer bushing in center blade stays in position. Apply
good grade of bearing grease to clevis or yoke in center blade where
it rides on the eccentric bearing assembly. Insert rear cap screw into
shear housing but do not completely tighten.
To install shear head assembly onto drive motor, make sure all
cap screws are loosened about 3 or 4 complete turns. Place shear
head onto unit and alternately tighten cap screws snugly to lock head
assembly in place. It may be necessary to gently tap the shear head
into place if it does not readily slip onto the nose of the power unit.
Operation
For accurate work, always clamp or anchor the material to be cut.
Line up one edge of the tool's middle blade with the cutting line and
advance blades into the material without forced effort or unnecessary
pressure. A little practice will enable you to determine what forward
3
loosen eccentric nut by turning