DEWALT DW756 Heavy Duty Bench Grinder User Manual

: June 22, 2024
: Dewalt

Table of Contents

DEWALT DW756 Heavy Duty Bench Grinder User Manual
Grounding Instructions
Safety Instructions For All Tools
Minimum Gage for Cord Sets
Installing Spark Guards and Eye Shield
Maintenance
Accessories
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DEWALT DW756 Heavy Duty Bench Grinder User Manual

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)

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

Grounding Instructions

This tool should be grounded while in use to protect the operator from electric shock. The tool is equipped with a 3-conductor cord and 3- 3-prong grounding type plug to fit the proper grounding type receptacle. The green (or green and yellow) conductor in the cord is the grounding wire. Never connect the green (or green and yellow) wire to a live terminal. If your unit is intended for use on less than 150 V, it has a plug that looks like that shown in the sketch

A. If it is for use on 150 to 250 V, it has a plug that looks like that shown in sketch D. An adapter, sketches B and C, is available for connecting sketch A-type plugs to 2-prong receptacles. The green-colored rigid ear, lug, or the like, extending from the adapter must be connected to a permanent ground, such as a properly grounded outlet box. No adapter is available for a plug as shown in sketch D. ADAPTER SHOWN IN FIGURES B and C ARE NOT FOR USE IN CANADA.

Safety Instructions For All Tools

KEEP THE WORK AREA CLEAN. Cluttered areas and benches invite injuries.
CONSIDER THE WORK AREA ENVIRONMENT. Don’t expose power tools to rain. Don’t use power tools in damp locations. Keep the work area well-lit. Do not use tools in the 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 the tool or extension cord. All visitors should be kept away from the work area.
STORE IDLE TOOLS. When not in use, tools should be stored in dry, and high or locked-up places — 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 THE RIGHT TOOL. Don’t force small tools or attachments to do the job of a heavy-duty tool. Don’t use tools for purposes not intended.
DRESS PROPERLY. Do not wear loose clothing or jewellery. They can be caught in moving parts.
Rubber gloves and non-skid footwear are recommended when working outdoors. Wear a protective hair covering to contain long hair.
USE SAFETY GLASSES. Also, use a face or dust mask if the operation is dusty.
DON’T ABUSE CORD. Never carry the tool by cord or yank it to disconnect it from the receptacle. Keep cord from heat, oil, and sharp edges.
SECURE WORK. Use clamps or a vice to hold the work. It’s safer than using your hand and it frees both hands to operate the 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 them repaired by an authorized service facility. Inspect extension cords periodically and replace them 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, and cutters.
REMOVE ADJUSTING KEYS AND WRENCHES. Form a habit of checking to see that keys and adjusting wrenches are removed from the tool before turning it on.
AVOID UNINTENTIONAL STARTING. Don’t carry a tool with your finger on the switch. Be sure the switch is off when plugging in.
EXTENSION CORDS. Use only 3-wire extension cords that have 3-prong grounding-type plugs and 3-pole receptacles that accept the tool’s plug. Replace or repair damaged 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 gauge. The smaller the gauge number, the heavier the cord.

Minimum Gage for Cord Sets

OUTDOOR USE EXTENSION CORDS. When the 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 the 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 should be properly repaired or replaced by an authorized service centre unless otherwise indicated elsewhere in this instruction manual. Have defective switches replaced by the authorized service centre. Do not use the tool if the switch does not turn it on and off. Additional Safety Instructions for Grinders

ALWAYS USE GUARDS AND EYE SHIELDS. WHEN GRINDING, ALWAYS KEEP GUARDS IN PLACE.
Use only grinding wheels having a maximum operating speed at least as high as “No Load RPM” marked on the tool’s nameplate.
Before using, inspect the recommended accessory for cracks or flaws. If such a crack or flaw is evident, discard the accessory. DO NOT
USE A GRINDING WHEEL THAT IS CRACKED OR FLAWED IN ANY WAY.
When starting the tool, let it run for one minute. Never start the tool with a person in line with the wheel. This includes the operator.
Do not grind on the sides of grinding wheels unless they are specifically designed for that purpose.
Do not over-tighten the wheel clamp nut. This may crack the grinding wheel.
Clean the cavity around the grinding wheel periodically.
CAUTION: Some wood contains preservatives such as copper chromium arsenate (CCA) which can be toxic.
When sanding these materials extra care should be taken to avoid inhalation and minimize skin contact.

Motor
Be sure your power supply agrees with the nameplate marking. 120 Volts, 50/60 Hz means alternating current only should be used to operate this tool. A power decrease of more than 10% will cause loss of power and overheating. All DeWalt tools are factory tested; if this tool does not operate, check the power supply

Bench Mounting

The grinder should be unplugged.
Remove the drilling template from this manual (pg. 5) and place it in the position of the bench. Check for the availability of power for the grinder. Tape the template to the bench.
Using a centre punch, transfer the hole centres for drilling.
Drill appropriate-sized holes.
Insert 1/4” (6mm) Hex head bolts through washers and the holes. You may want to use washers on the underside of the bench as well.
Tighten the nuts. Do not over-tighten. Allow the rubber feet to absorb the vibration when the grinder is running.

Installing Tool Rests

TURN OFF THE POWER AND DISCONNECT FROM THE POWER SUPPLY.
Your grinder includes a hex wrench, attached to the right of the On/Off switch. Use this wrench when installing the tool rest brackets, tool rest and eye shield brackets.
First install the tool rest brackets, as shown in Fig. 2. Next attach the tool rests. Use the bolts, washers, spacers and lock nuts from the plastic bag to secure the brackets and tool rests in place.
NOTE: There is a left and right tool rest. When in actual use, the tool rests should be adjusted to within 1/8” of the grinding wheel or other accessory being used.

DW756 – 6” Bench Grinder 1/2”(13mm) Arbor, 3450 RPM
DW758 – 8” Heavy Duty Bench Grinder 5/8”(16mm) Arbor, 3600 RPM

Installing Spark Guards and Eye Shield

Brackets
TURN OFF TOOL AND DISCONNECT FROM POWER SUPPLY
The combination spark guard and eye shield brackets are assembled and in a plastic bag. They are identified as L for left and R for right. Refer to Figure 3 to install them to the bench grinder using the two screws in the wheel guard (in some cases these screws will be in the plastic bag). Adjust the edge of the spark guard to within 1/16” of the grinding wheel or other accessory as shown in the figure. Tighten the two screws securely

Installing Eye Shields
TURN OFF THE TOOL AND DISCONNECT FROM THE POWER SUPPLY.
Remove the steel strip from the top surface of each eye shield by removing the two screws. Install the shields, (they are identical and will fit either side) to the brackets, as shown in Fig. 4. Tighten screws securely. Adjust eye shields so they are between the wheels and your eyes.

EYE SHIELDS ARE NOT DESIGNED TO REPLACE SAFETY GLASSES.
Tighten the shields in place by tightening the plastic knob in the bracket assembly. Remove the protective paper cover.

Operation
NEVER USE A BENCH GRINDER IF IT IS NOT FIRMLY FASTENED TO A WORKBENCH OR RIGID FRAME. Before turning the grinder on, put on safety glasses. Turn on the grinder and allow it to reach full speed (3450 RPM – DW756, 3600 RPM – DW758). Hold the workpiece firmly and against the tool rest. Hold very small pieces with pliers or other suitable clamps. Feed the work smoothly and evenly into the grinding wheel. Move the work slowly and avoid jamming the work against the wheel. As the wheel tends to slow down you should occasionally release the pressure to let the wheel return to full speed.

Grind only on the face of the grinding wheel and never on the side.
(Some wheels are designed for side grinding and will say so on their instruction sheets).
CAUTION: Prolonged grinding will cause most materials to become hot. Handle them with pliers or thick gloves.

Switch
The switch is located on the front of the grinder, on the base. (Figure To turn the tool on depressing the side of the rocker switch on the left side, marked “ON”. To turn off the grinder, depress the right side of the rocker switch, marked “OFF”.

Installing Tool Rests
TURN OFF AND UNPLUG THE BENCH GRINDER
Remove the tool rests from the packing and install as shown in Figure 2. Use the washers and screws supplied.
CAUTION: Longer screws may interfere with the movement of the grinding wheel.

Maintenance

CLEANING
Blowing dust and grit out of the motor housing using compressed air is a necessary regular maintenance procedure. Dust and grit containing metal particles often accumulate on interior surfaces and could create an electrical shock hazard if not frequently cleaned out. ALWAYS WEAR SAFETY GLASSES.
CAUTION: Never use solvents or other harsh chemicals for cleaning the non-metallic parts of the tool. Use a clean, dry rag only.

LUBRICATION
DeWALT tools are properly lubricated at the factory and are ready for use. Tools should be relubricated regularly every sixty days to six months, depending on usage. (Tools used constantly on production or heavy-duty jobs and tools exposed to heat may require more frequent lubrication.) This lubrication should only be attempted by trained power tool repair persons, such as those at DeWALT service centres or in other qualified service organizations.

Accessories

Recommended accessories for use with your tool are available at an extra cost from your distributor or local service centre. Grinding wheels must fit within the confines of the guard and must be rated higher than the recommended speed as marked on the nameplate. Recommended accessories for use with your tool are available at an extra cost from your distributor or local service centre.
CAUTION: Strands of wire cup brushes may break and fly off while in use. Users and others in the area should wear adequate eye, face and body protection. Use only wire cup brushes that are rated at or greater than the RPM shown on the tool’s nameplate.
WARNING: To reduce the risk of injury, always use proper guards when grinding and wearing eye protection.
CAUTION: The use of any non-recommended accessory may be hazardous.

Changing Accessories
TURN OFF THE TOOL AND DISCONNECT FROM THE POWER SUPPLY. CHANGE ACCESSORIES WHEN THE SPARK GUARD CAN NO LONGER BE ADJUSTED TO 1/16” FROM THE WHEEL. DW756 – USE ONLY WHEELS THAT MEASURE 6” IN DIAMETER.

THIS TOOL HAS 1/2” ARBORS ON EACH SIDE. DW758 – USE ONLY WHEELS THAT MEASURE 8” IN DIAMETER. THIS TOOL HAS 5/8” ARBORS ON EACH SIDE.

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Follow the steps below to remove and replace an accessory.

Raise the eye shield.
Loosen and pull the tool rest out as far as possible. Do not remove it.
Loosen and pull the spark guard out as far as possible, Do not remove it.
Remove the screws from the side cover and remove the cover.
Using hex or adjustable wrenches, grasp the two hex nuts holding the wheels to the arbour shaft at each end of the tool. To remove the wheel from the left turn the hex nut clockwise while holding the other stationary.
Remove the wheel washer and the wheel. Inspect the wheel for cracks, chips or any other visible damage (other than normal wear) and discard if such damage is found. Inspect the blotter for damage.
If the blotter is missing or severely damaged, replace it with a piece of thin cardboard or blotter paper cut to the same size. NEVER USE A WHEEL WITHOUT A BLOTTER.
Install the new wheel or other accessory. Be sure that both wheel washers are in place (concave side toward the wheel) See Fig. 5. For the DW756 see Fig. 5 and 6.
Hold as before and tighten the nut firmly but do not overtighten. Overtightening can crack a grinding wheel.
Replace the wheel cover and its screws.
Adjust the spark guard to 1/16” from the wheel and tighten it securely.
Adjust the tool rest to 1/8” from the wheel and tighten it securely.
Adjust the eye shield to a point between your eyes and the wheel. The bench grinder is now ready for use.
Follow the above steps to install buffing wheels and wire wheel brushes as well as grinding wheels.

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Important!
To assure product safety and reliability, repairs, maintenance and adjustment should be performed by DEWalt (U.S.) Inc. Industrial Service Centers or other qualified service organizations, These service organizations service DeWalt tools always using DeWalt replacement parts.

Full Warranty
DEWALT heavy-duty industrial tools are warranted for one year from the 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.

DW756
GRINDING WHEELS MAX. SAFE SPEED