DeWalt DW870 User manual

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INSTRUCTION MANUAL
GUIDE D'UTILISATION
MANUAL DE INSTRUCCIONES
INSTRUCTIVO DE OPERACION, CENTROS DE SERVIClO Y POLIZA
DE GARANTJA. ADVERTENClA: L¢:ASE ESTE INSTRUCTIVO ANTES
DE USAR EL PRODUCTO.
®
DW870
14" (355 mm) Heavy Duty Chop Saw
Scie fendeuse de 355 mm (14 po) et de service intensif
Cortadora de metales de 355 mm (14")

IF YOU HAVE ANY QUESTIONS OR COMMENTS ABOUT THIS
OR ANY DEWALT TOOL, CALL US TOLL FREE AT:
1-800-4-DEWALT (1-800-433-9258)
TRIGGER
SWITCH
UPPER GUARD
BLADE
LEVER
LOWER
GUARD
RELEASE
LEVER
FENCE
z_WARNING: FOR YOUR OWN SAFETY READ INSTRUCTION
MANUAL BEFORE OPERATING CHOP SAW.
Important Safety Instructions
Z_WARNING! Read and understand all instructions. Failure to
follow all instructions listed below may result in electric shock, fire
and/or serious personal injury.
SAVE THESE INSTRUCTIONS
•KEEP GUARDS IN PLACE and in working order
•REMOVE ADJUSTING KEYS AND WRENCHES. Form habit of
checking to see that keys and adjusting wrenches are removed
from tool before turning it on.
• KEEP WORK AREA CLEAN. Cluttered areas and benches invite
injuries.
• DON'T USE IN DANGEROUS ENVIRONMENT. Don't use power
tools in damp or wet locations, or expose them to rain. Keep work
area well lighted.
• KEEP CHILDREN AWAY. All visitors should be kept at a safe
distance from work area.
• MAKE WORKSHOP KID PROOF with padlocks, master switches,
or by removing starter keys.
• DON'T FORCE TOOL. It will do the job better and safer at the
rate for which it was designed.
USE RIGHT TOOL. Don't force tool or attachment to do a job for
which it was not designed.
USE PROPER EXTENSION CORD. Make sure your extension
cord is in good condition. When using and 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.

Volts
120V 0-25 26-50
240V 0-50 51-100
Ampere Rating
More Not more
Than Than
0 6 18
6 10 18
10 -12 16
12 -16 14
Minimum Gage for Cord Sets
Total Length of Cord in Feet
51-100 101-150
101-200 201-300
American WireGage
16 16 14
16 14 12
16 14 12
12 Not Recommended
• WEAR PROPER APPAREL. Do not wear loose clothing, neckties,
rings, bracelets, or other jewelry which may get caught in moving
parts. Nonslip footwear is recommended. Wear protective hair
covering to contain long hair. Air vents often cover moving parts and
should also be avoided.
• ALWAYS USE SAFETY GLASSES. Also use face or dust mask ff
cutting operation is dusty. Everyday eyeglasses only have impact
resistant lenses, they are not safety glasses.
• SECURE WORK. Use clamps or a vise to hold work when
practical. 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
best and safest performance. Follow instructions for lubricating and
changing accessories.
• DISCONNECT TOOLS before servicing; when changing acces-
sories, such as blades, bits, cutters, and the like.
• REDUCE THE RISK OF UNINTENTIONAL STARTING. Make
sure switch is in off position before plugging in.
• USE RECOMMENDED ACCESSORIES. Consult the instruction
manual for recommended accessories. The use of improper
accessories may cause risk of injury to persons.
• NEVER STAND ON TOOL. Serious injury could occur ff the tool is
tipped or if the cutting tool is unintentionally contacted.
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
should be properly repaired or replaced.
• DIRECTION OF FEED. Feed work into a blade or cutter against
the direction of rotation of the blade or cutter only.
• NEVER LEAVE TOOL RUNNING UNATTENDED. TURN
POWER OFF. Don't leave tool until it comes to a complete stop.
• REPLACEMENT PARTS. When servicing use only identical
replacement parts.
TO REDUCE THE RISK OF ELECTRIC SHOCK, this equipment
may have a polarized plug (one blade is wider than the other.)
This plug will fit in a polarized outlet only one way. If the plug does
not fit, contact a quafified electrician to install the proper outlet.
DO NOT CHANGE THE PLUG IN ANY WAX
The tool may be equipped with a 3-prong grounding type plug. This
plug is to be used in a grounded outlet only. If the plug does not fit,
contact a quafified electrician to install the proper outlet. DO NOT
CHANGE THE PLUG IN ANY WAY
Additional Safety Rules for Chop Saw
•Always wear safety goggles or other eye protection when using this tool.
• Beforeusing, inspecteachcuttingwheelforcracksorflaws, lfacrack
or flaw is evident--discard the wheefl The wheel should also be
inspected whenever you think the tool may have been dropped.
When starting the tool (with a new or replacement wheel installed)
place the tool in a weft protected area. If the wheel has an undetected
crack or flaw, it should burst in less than one minute. Never start the
tool with a person in line with the wheel This includes the operator.
In operation, avoid bouncing the wheel or giving it rough treatment.
If this occurs, stop the tool and inspect the wheel

Cleanyourchopsawperiodicallyfollowingtheprocedureinthismanual
Donotremovewheelguard.
ALWAYSUSETHEVISEORSPECIALFIXTURETOCLAMP
WORK SECURELY Other aids such as the, spring, bar, or C-clamps
may be appropriate for certain sizes and shapes of workpiece. Use
care in selecting and placing these clamps and make a dry run before
making a cut.
Use only 14" type I wheels rated at 4100 rpm or higher.
Allow cut off parts to cool before handling.
Do not attempt to cut wood or plastic with this tool.
NEVER CUT MAGNESIUM WITH THIS TOOL.
Use chop saw in a well-ventilated area.
Turn chop saw off before removing any pieces from the base.
DO NOT CUT ELECTRICALLY LIVE MATERIAL.
NEVER USE A CIRCULAR SAW BLADE IN THIS CHOP SAW.
do not use toothed blades.
DO NOT OPERATE THIS TOOL NEAR FLAMMABLE LIQUIDS,
GASES OR DUST, Sparks or hot chips from cutting or arcing motor
brushes may ignite combustible materials.
•Do not use the side of the abrasive wheel as a deburring grindet_
This will substantially weaken the wheel creating an unsafe
condition. The wheel may come apart.
z_CAUTION: Wear appropriate hearing protection during use.
Under some conditions and duration of use, noise from this product
may contribute to hearing loss.
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.
• Avoid prolonged contact with dust from power sanding,
sawing, grinding, drilling, and other construction activities.
Wear protective clothing and wash exposed areas with soap
and water. Allowing dust to get into your mouth, eyes, or lay on the
skin may promote absorption of harmful chemicals.
Power Supply
Be sure your power supply agrees with the nameplate marking. 120
volts, "60 Hz" means alternating current (normal 120 volt, 60 Hz
house current).
A voltage decrease of more than 10% will cause a loss of power and
overheating.
Cutting Capacity
The wide vise opening and high pivot point provide cutting capacity
for many large pieces. Use the cutting capacity chart to determine
total maximum size of cuts that can be made with a new wheel.
_CAUTION: CERTAIN LARGE, CIRCULAR OR IRREGULARLY
SHAPED OBJECTS MAY REQUIRE ADDITIONAL HOLDING
MEANS IF THEY CANNOT BE HELD SECURELY IN VISE.
_CAUTION: DO NOT CUT MAGNESIUM WITH THIS TOOL.
Maximum Cutting Capacity
NOTE: CAPACITY SHOWN ON CHART ASSUMES NO WHEEL WEAR
AND OPTIMUM FENCE POSITION.
Standard Equipment
1 14" Metal Cutting Abrasive Wheel. Use only high strength Type 1
organic bonded wheels rated 4,100 rpm or higher.(Aluminum
Oxide)
1 Wheel Wrench
3

To Carry
Fold down unit to position where you can attach chain to pin on tool
arm (Fig. 1).
Unlocking
To unlock tool and raise head, depress motor arm slightly and
remove chain. Motor arm will then pivot upward (see Figure 2).
FIG. 1
CHAIN
LOCK
LEVER
FIG. 3
WRENCH
FENCE BOLTS
FENCE
VISE
FIG. 4
Material Clamping and Supporting
•Angles are best clamped and cut with both legs resting against
base
• A spacer block slightly narrower than the work space
can be used to increase wheel utilization.
• Long workpieces must be supported by a block so it will be
level with top of base. The cut off end should be free to fall
downward to avoid wheel binding.
Vise Operation
Vise has a quick travel feature. To release the vise when it is clamped
tightly, turn the crank counterclockwise one or two times to remove
clamping pressure. Lift vise lever up. Pull crank assembly out as far
as desired. Vise may be shoved into work without cranking. Lower
vise lever then tighten vise on work by using crank (see Figure 5).
4.755
3.93 ,4/"
F_
i 3¸¸
CO
I
2
1
o' F 2' 3' 7' 8'
WIDTH
FENCE AT FORWARD
POSITION
J FENCE AT REAR
/POS{TION
4' 15 16
9 625" 775"

To Adjust Vise Stop
CUTTING ANGLE
Use the wrench to
loosen the two hex
bolts (Fig. 3). (Do
not remove the
bolts). The fence
can be rotated in
either direction.
Securely tighten
both the bolts
before use.
FIG. 5
Switch
To start the tool,
depress the trigger switch shown in Figure 2. To turn the tool off,
release the trigger switch. Keep hands and material from wheel until it
has coasted to a stop.
Removal and Installation of Wheels
1. Be sure tool is disconnected from power supply.
2. Push in wheel lock lever (Figure 6) and rotate wheel by hand until
wheel lock lever engages slot in inside flange to lock wheel.
Loosen the bolt counterclockwise in the center of the abrasive
wheel with the 8 mm hex wrench found in the holder in the base.
Bolt has right hand thread.
3. Remove the bolt, washer, outside flange, adapter and old wheel
(Fig. 10).
4. install the new abrasive wheel by reversing the above steps.
Make sure the adapter is on the shaft and centered on the wheel.
5. Do not over tighten bolt.
DO NOT MAKE ANY ADJUSTMENT WHILE THE WHEEL IS IN MOTION.
DO NOT MAKE ANY ADJUSTMENT WHILE CHOP SAW IS PLUGGED
INTO POWER SUPPLY.
WARNING: CHECK THE WORK SURFACE THAT THE CHOP
SAW RESTS ON WHEN REPLACING WITH A NEW ABRASIVE
WHEEL, IT IS POSSIBLE THAT THE WHEEL MAY CONTACT ANY
ITEMS OR STRUCTURE THAT EXTENDS ABOVE WORK SURFACE
(UNDER THE BASE) WHEN THE ARM IS FULLY LOWERED.
Procedure For Permanent Mounting
1. Drill four holes, 5/16" diameter minimum, through the work
surface (Fig. 7).
2. Remove screws from feet.
3. Insert 1/4-20 screws through underside of work surface,
through feet, into holes in tool base. The proper screw length is
equal to the thickness of the work surface plus 1 inch
(25 mm).
CRADLE MOUNTING
1. Cut two boards approximately 20" long x 2" high x 4" wide.
2. Place chop saw at desired work location.
3. Place boards tightly along side, and nail to work surface,
(Figure 8).
FIG. 6
ABRASIVE WHEEL
ADAPTER WASHER
HEX HEAD BOLT
GEAR FLANGE,
SHAFT INSIDE FLANGE, OUTSIDE

FIG.7 FIG.8 FIG.9
16-3/8"
(416mm)
8-1/2",÷,
(216mm)
Motor Brush Inspection and
Replacement
Be sure tool is unplugged before inspecting brushes. Brushes should
be regularly inspected for wear. To inspect brushes, unscrew the
two end cap screws and remove end cap. To remove each brush, first
unplug the shunt wire terminal connection. Then carefully back the
brush spring out of the brush box and remove brush. Brushes should
slide freely in brush box. If brushes are worn down to .3" they should
be replaced (see Figure 9). To reinstall each brush carefully back
the spring out of the brush box, insert the brush and return the spring
making sure it is pressing on the brush and not touching the brush
box. Then replace the end cap and two screws.
7.62 mm
Operation Tips for More Accurate Cuts
•Allow the wheel to do the cutting. Excessive force will cause the
wheel to glaze reducing cutting efficiency and/or to deflect causing
inaccurate cuts.
• Adjust fence angle. (Figure 3)
• Make sure material is laying flat across base.
• Properly clamp material to avoid movement and vibration.
Cleaning
Blowing dust and grit out of the main housing by means of an air hose
is recommended and may be done as often as dirt is seen collecting
in and around the air vents.
Accessories
Recommended accessories for use with your tool are available at
extra cost from your local dealer or authorized service center. If you
need assistance in locating any accessory for your tool, contact:
DEWALT industrial Tool Co., 701 East Joppa Road, Baltimore, MD
21286
z_CAUTION: The use of any other accessory not recommended
for use with this tool could be hazardous.
Important
To assure product SAFETY and RELIABILITY, repairs, maintenance
and adjustment should be performed by authorized service centers
or other qualified service organizations, always using identical

replacementparts.ALWAYSWEARSAFETY GLASSES. ALWAYS
SECURE WORK IN VISE. DISCONNECT TOOL FROM POWER
SUPPLY BEFORE CHANGING WHEEL.
Lubrication
Closed-type, grease-sealed ball bearings are used throughout. These
bearings have sufficient lubrication packed in them at the factory to last
the life of the chop saw.
Gears should be relubricated every 60 to 90 days, depending upon
use. This lubrication should only be attempted by experienced power
tool repair persons like the mechanics at DEWALT service centers. The
gear case should be wiped clean and 1/2 oz. (16 grams) of DEWALT
Lubricant Part No. 790206 (6 oz. tube) placed in the gear case.
Full Warranty
DEWALT heavy duty industrial tools are warranted for one year from
date of purchase. We will repair, without charge, any defects due to
faulty materials or workmanship. For warranty repair information, call
1-800-4-DEWALT. This warranty does not apply to accessories or
damage caused where repairs have been made or attempted by
others. This warranty gives you specific legal rights and you may have
other rights which vary in certain states or provinces.
in addition to the warranty, DEWALT tools are covered by our:
30 DAY NO RISK SATISFACTION GUARANTEE
if you are not completely satisfied with the performance of your
DEWALT heavy duty industrial tool, simply return it to the participating
seller within 30 days for a full refund. Please return the complete unit,
transportation prepaid. Proof of purchase may be required.
FREE WARNING LABEL REPLACEMENT: If your warning labels
become illegible or are missing, call 1-800-4-DEWALT for afree
replacement.

TROUBLE! TOOL WILL NOT START
WHAT'S WRONG?
1. Toot not plugged in.
2. Fuse blown or circuit breaker tripped.
3. Cord damaged.
4. Brushes worn out.
TROUBLE! TOOL MAKES UNSATISFACTORY CUTS
WHAT'S WRONG?
1. Glazed wheel.
2. Workpiece incorrectly placed or clamped.
TROUBLE! BLADE DOES NOT COME UP TO SPEED
WHAT'S WRONG?
1. Extension cord too light or too long.
2. Low voltage.
3. Low generator voltage.
TROUBLE! TOOL VIBRATES EXCESSIVELY DURING CUT
WHAT'S WRONG?
1. Too! not mounted securely to stand or work bench.
2. Damaged wheel.
3. Workpiece not clamped properly.
TROUBLE! DOES NOT MAKE ACCURATE CUTS
WHAT'S WRONG?
1. Fence not adjusted correctly.
2. Wheel is not square to fence.
3. Excessive force used to make cut.
4. Work piece moving.
TROUBLE! CANNOT MOVE ARM
WHAT'S WRONG?
1. Auto-retracting wheel guard will not move.
2. Chain is engaged.
TROUBLE! MATERIAL MOVES DURING CUT
WHAT'S WRONG?
1. Fence slipping or workpiece incorrectly placed or clamped.
2. Vise too loose
3. Excessive cutting force.
WHAT TO DO...
1.Plug in saw.
2. Replace fuse or reset circuit breaker.
3. Have cord replaced by authorized service center.
4. Have brushes replaced by qualified service person.
WHAT TO DO...
1.Dress the wheel or replace with a new one.
2. Firmly clamp and support workpiece.
WHAT TO DO...
1.Replace with adequate size cord. See chart on page 2.
2.Contact your electric company.
3.Check generator output voltage. Reduce number of tools powered by the generator.
WHAT TO DO...
1.Tighten all mounting hardware. See page 5, Procedures for Permanent Mounting.
2. Replace wheel.
3.Refer to Material Clamping and Supporting page 4.
WHAT TO DO...
1.Check and adjust. See Fence Operation on page 5.
2.Check and adjust.
&Reduce cutting force, let the wheel do the work.
4.Clamp workpiece securely. See Material Clamping and Supporting page 4. Make sure
material is laying flat against the base.
WHAT TO DO...
1.Check for damaged parts. Check for excessive chips in guard. Replace or repair as needed.
2.Push down slightly on the arm, remove chain from pin. Raise arm.
WHAT TO DO...
1.See Material Clamping and Supporting, page 4.
2.Tighten vise clamping.
3. Reduce cutting force.
11

SIVOUSAVEZDESQUESTIONSOUVOULEZNOUSFAIRE
PARTDEVOSCOMMENTAIRESCONCERNANTCETOUTILOU
TOUTAUTREOUTILDEWALT,COMPOSEZSANSFRAISLE:
1800433-9258. PROTI_GE-LAMESUPERIEUR
INTERRUPTEUR
AGACHETTE
LEVIER DE
VERROUILLAG
E DE LA LAME
INFERIEUR
ETAU LEVIER DE
DEGAGEMENT
GUIDE
_AVERTISSEMENT : POUR ASSURER VOTRE PROTECTION,
LIRE LE MANUEL D'UTILISATiON AVANT DE FAIRE FONC-
TIONNER L'OUTIL
Mesures de s_curit_ importantes
Z_AVERTISSEMENT! LIRE ET COMPRENDRE TOUTES LES
DIRECTIVES, car le nonIrespect des directives suivantes pourrait
entraTner un choc &lectrique, un incendie ou des blessures graves.
CONSERVER CES DIRECTIVES
GARDER LES DISPOSITIFS DE PROTECTION EN PLACE et en
bon etat de fonctionnement.
RETIRER LES CLE-S DE RE-GLA GE; prendre I'habitude de s'assurer
que les cles de reglage soient retirees de I"outil avant de demarrer ce
demier.
GARDER LA ZONE DE TRAVAIL PROPRE; les espaces de travail
et les etablis encombres sont propices aux accidents.
NE PAS UTILISER DANS DES ENDROITS DANGEREUX; ne pas
utiliser I'outil electrique dans des endroits humides ou mouilles, ni
I'exposer a la pluie. Garder la zone de travail bien eclairee.
TENIR LES ENFANTS AL'E-CART,. s'assurer que personne ne se
tienne trop pros de la zone de travail.
S'ASSURER QUE L'ATELIER SOIT SOR POUR LES ENFANTS;
utiliser des cadenas, des interrupteurs centraux ou enlever les
commandes de demarrage.
NE PAS FORCER L'OUTIL; pour obtenir de meilleurs resultats et
reduire les risques de blessure, laisser I'outil couper a la vitesse pour
laquelle il a ere con_u.
UTILISER L'OUTIL APPROPRIE-; ne pas forcer I'outil ni les
accessoires, ni les utiliser pour des travaux autres que ceux pour
lesquels ils ont ere con_us.
UTILISER LES RALLONGES APPROPRIE-ES; s'assurer que la
rallonge electrique soit en bon etat et qu'elle soit en mesure de porter
le courant necessaire a I'outil. Une rallonge de calibre inferieur
entrMnera une chute de tension se traduisant par une perte de
puissance et une surchauffe. Le tableau ci-dessous illustre les calibres
que I'on doit utiliser selon la Iongueur de la raflonge et I'intensite
nominale indiquee sur la plaque signaletique. En cas de doute, utiliser
12