DeWalt DW890, DW891, DW891-220 Instruction Manual

DEWALT Industrial Tool Co., 701 East Joppa Road, Baltimore, MD 21286 Printed in U.S.A. (JUN00-CD-1) Form No. 384122

DW890, DW891, DW891-220 Copyright © 1997, 2000

DW890/384122 9/1/00 3:24 PM Page 2

INSTRUCTION MANUAL
GUIDE D'UTILISATION
MANUAL DE INSTRUCCIONES

DW890, DW891, DW891-220

Swivel Head Shears
Cisaille à tête pivotante
Cizalla con cabeza giratoria

INSTRUCTIVO DE OPERACIÓN, CENTROS DE SERVICIO Y PÓLIZA
DE GARANTÍA. ADVERTENCIA: LÉASE ESTE INSTRUCTIVO ANTES
DE USAR EL PRODUCTO.

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Important Safety Instructions

WARNING: When using electric tools, basic safety precautions
should always be followed to reduce risk of fire, electric shock, and
personal injury, including the following:

READ ALL INSTRUCTIONS

Double Insulation

Double insulated tools are constructed throughout with two separate
layers of electrical insulation or one double thickness of insulation
between you and the tool’s electrical system. Tools built with this
insulation system are not intended to be grounded. As a result, your
tool is equipped with a two prong plug which permits you to use
extension cords without concern for maintaining a ground
connection.

NOTE: Double insulation does not take the place of normal safety
precautions when operating this tool. The insulation system is for
added protection against injury resulting from a possible electrical
insulation failure within the tool.

CAUTION: WHEN SERVICING USE ONLY IDENTICAL RE­PLACEMENT PARTS. Repair or replace damaged cords.

Polarized Plugs(DW890, DW891)

Polarized plugs (one blade is wider than the other) are used on
equipment to reduce the risk of electric shock. When provided, this
plug will fit into a polarized outlet only one way. If the plug does not
fit fully into the outlet, reverse the plug. If it still does not fit, contact a
qualified electrician to install the proper outlet. Do not change the
plug in any way.

Safety Instructions For All Tools

• KEEP WORK AREA CLEAN. Cluttered areas and benches invite

injuries.

• CONSIDER WORK AREA ENVIRONMENT. Don’t expose power

English

IF YOU HAVE ANY QUESTIONS OR COMMENTS ABOUT THIS
OR ANY D

EWALT TOOL, CALL US TOLL FREE AT:

1-800-4-DEWALT (1-800-433-9258)

SWIVEL

HEAD

BLADE

DW891-200

TRIGGER

SWITCH

DEWALT... BUILT JOBSITE TOUGH

DeWalt high performance industrial tools are made for America’s
toughest industrial and construction applications. The design of every
tool in the line—from drills to sanders to grinders—is the result of
rigorous use on jobsites and throughout industry. Each tool is
produced with painstaking precision using advanced manufacturing
systems and intense quality control. Every tool is checked before it
leaves the factory to make sure that it meets your standards for
durability, reliability and power.

D

EWALT Built Jobsite Tough…WE GUARANTEE IT.

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tools to rain. Don’t use power tools in damp or wet locations. Keep
work area well lit. Do not use tool in presence of flammable liquids
or gases.

• GUARD AGAINST ELECTRIC SHOCK. Prevent body contact
with grounded surfaces. For example; pipes, radiators, ranges, and
refrigerator enclosures.

• KEEP CHILDREN AWAY. Do not let visitors contact tool or
extension cord. All visitors should be kept away from work area.

• STORE IDLE TOOLS. When not in use, tools should be stored in
dry, and high or locked-up place — out of reach of children.

• DON’T FORCE TOOL. It will do the job better and safer at the
rate for which it was intended.

• USE RIGHT TOOL. Don’t force small tool or attachment to do the
job of a heavy-duty tool. Don’t use tool for purpose not intended.

• DRESS PROPERLY. Do not wear loose clothing or jewelry. They
can be caught in moving parts. Rubber gloves and non-skid
footwear are recommended when working outdoors. Wear
protective hair covering to contain long hair.

• USE SAFETY GLASSES. Also use face or dust mask if operation
is dusty.

• DON’T ABUSE CORD. Never carry tool by cord or yank it to
disconnect from receptacle. Keep cord from heat, oil, and sharp
edges.

• SECURE WORK. Use clamps or a vise to hold work. It’s safer than
using your hand and it frees both hands to operate tool.

• DON’T OVERREACH. Keep proper footing and balance at all
times.

• MAINTAIN TOOLS WITH CARE. Keep tools sharp and clean for
better and safer performance. Follow instructions for lubricating
and changing accessories. Inspect tool cords periodically and if
damaged, have repaired by authorized service facility. Inspect
extension cords periodically and replace if damaged. Keep
handles dry, clean, and free from oil and grease.

• DISCONNECT OR LOCK OFF TOOLS when not in use, before
servicing, and when changing accessories, such as blades, bits,
cutters.

• REMOVE ADJUSTING KEYS AND WRENCHES. Form habit of
checking to see that keys and adjusting wrenches are removed
from tool before turning it on.

• AVOID UNINTENTIONAL STARTING. Don’t carry tool with finger
on switch. Be sure switch is off when plugging in.

• EXTENSION CORDS. Make sure your extension cord is in good
condition. When using an extension cord, be sure to use one
heavy enough to carry the current your product will draw. An
undersized cord will cause a drop in line voltage resulting in loss
of power and overheating. The following table shows the correct
size to use depending on cord length and nameplate ampere
rating. If in doubt, use the next heavier gage. The smaller the gage
number, the heavier the cord.

Recommended Minimum Wire Size for Extension Cords

Total Length of Cord

25 ft. 50 ft. 75 ft. 100 ft. 125 ft. 150 ft. 175 ft.

7.6 m 15.2 m 22.9 m 30.5 m 38.1 m 45.7 m 53.3 m

Wire Size

18 AWG 18 AWG 16 AWG 16 AWG 14 AWG 14 AWG 12 AWG

• OUTDOOR USE EXTENSION CORDS. When tool is used
outdoors, use only extension cords intended for use outdoors and
so marked.

• STAY ALERT. Watch what you are doing. Use common sense.
Do not operate tool when you are tired.

• CHECK DAMAGED PARTS. Before further use of the tool, a
guard or other part that is damaged should be carefully checked
to determine that it will operate properly and perform its intended
function. Check for alignment of moving parts, binding of moving
parts, breakage of parts, mounting, and any other conditions that
may affect its operation. A guard or other part that is damaged

1

English

DW890/384122 9/1/00 3:24 PM Page 1

2

should be properly repaired or replaced by an authorized service
center unless otherwise indicated elsewhere in this instruction
manual. Have defective switches replaced by authorized service
center. Do not use tool if switch does not turn it on and off.

• CAUTION: When cutting into walls, floors or wherever live
electrical wires may be encountered, DO NOT TOUCH ANY
METAL PARTS OF THE TOOL! Hold the tool only by insulated
grasping surfaces to prevent electric shock if you saw into a live
wire.

WARNING: Some dust created by power sanding, sawing, grinding,
drilling, and other construction activities contains chemicals known to
cause cancer, birth defects or other reproductive harm. Some
examples of these chemicals are:

• lead from lead-based paints,

• crystalline silica from bricks and cement and other masonry
products, and

• arsenic and chromium from chemically-treated lumber (CCA).

Your risk from these exposures varies, depending on how often you do
this type of work. To reduce your exposure to these chemicals: work in
a well ventilated area, and work with approved safety equipment, such
as those dust masks that are specially designed to filter out
microscopic particles.

SAVE THESE INSTRUCTIONS

Motor

Your DEW ALT tool is powered by a DEWALT built motor . Be sure your
power supply agrees with the nameplate marking. Voltage decrease
of more than 10% will cause loss of power and overheating. All
D

EWALT tools are factory tested; if this tool does not operate, check

the power supply. If the nameplate marking on the tool shows 120
volts, 60Hz or “AC Only”,(DW890, DW891) your tool must be
operated only with alternateing current and never with direct current.
A marking of 220/240 volts, 50-60 Hz or “AC Only” (DW891-220)

English

FIG. 1

LOCK

BUTTON

FIG. 2

CAP

SCREWS

HOUSING

ECCENTRIC

BEARING

ASSEMBLY

WASHER

FIG. 3

SIDE KNIFE AND

SIDE SPACER

SPACER

BUSHINGS

LEFT SIDE KNIFE

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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

English

FIG. 4

LOWER
SURFACE OF
SIDE BLADES

BLADE

OPENING

SHEET METAL

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.

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