Dewalt DW890 Instruction Manual - Page 6

DW890/384122 9/1/00 3:24 PM Page 3 English FIG. 4 LOWER SURFACE OF SIDE BLADES BLADE OPENING SHEET METAL means your tool must be operated with alternating current never with direct current. 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. 3 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 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 loosen eccentric nut by turning 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.