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  3. A cold battery pack will charge at about half the rate of a warm 

battery pack. The battery pack will charge at that slower rate 
throughout the entire charging cycle and will not return to 
maximum charge rate even if the battery pack warms.

  4. If the battery pack does not charge properly:
  

a. 

 

Check operation of receptacle by plugging in a lamp or other 
appliance;

  

b. 

 

Check to see if receptacle is connected to a light switch which 
turns power off when you turn out the lights; 

  

c. 

 

Move the charger and battery pack to a location where the 
surrounding air temperature is approximately 65  °F 

– 

75  °F 

(18 ° – 24 °C); 

  

d. 

 

If charging problems persist, take the tool, battery pack and 
charger to your local service center.

  5. The battery pack should be recharged when it fails to produce 

sufficient power on jobs which were easily done previously. DO 
NOT CONTINUE to use under these conditions. Follow the 
charging procedure. You may also charge a partially used pack 
whenever you desire with no adverse effect on the battery pack.

  6. Foreign materials of a conductive nature such as, but not limited 

to, grinding dust, metal chips, steel wool, aluminum foil, or any 
buildup of metallic particles should be kept away from charger 
cavities. Always unplug the charger from the power supply when 
there is no battery pack in the cavity. Unplug the charger before 
attempting to clean.

  7. Do not freeze or immerse the charger in water or any other liquid.

WARNING: 

Shock hazard. Don’t allow any liquid to get inside the 

charger. Electric shock may result. 

WARNING:

 Burn hazard. Do not submerge the battery pack in 

any liquid or allow any liquid to enter the battery pack. Never attempt 
to open the battery pack for any reason. If the plastic housing of the 
battery pack breaks or cracks, return to a service center for recycling.

Storage Recommendations

  1. The best storage place is one that is cool and dry, away from direct 

sunlight and excess heat or cold.

 2. For long storage, it is recommended to store a fully charged 

battery pack in a cool dry place out of the charger for optimal 
results.

NOTE:

 Battery packs should not be stored completely depleted of 

charge. The battery pack will need to be recharged before use.

SAVE THESE INSTRUCTIONS FOR 

FUTURE USE

COMPONENTS

WARNING: 

Never modify the power tool or any part of it. Damage 

or personal injury could result. 

Please refer to the front of this section for the list of components.

INTENDED USE

This heavy-duty circular saw is designed for professional wood cutting 
applications. 

DO NOT 

use under wet conditions or in presence of flammable liquids 

or gases.

DO NOT

 let children come into contact with the tool. Supervision is 

required when inexperienced operators use this tool.

OPERATION 

WARNING: To reduce the risk of serious personal injury, 

turn tool off and disconnect tool from power source before 
making any adjustments or removing/installing attachments or 
accessories. 

An accidental start-up can cause injury.

Summary of Contents for DCS391B

Page 1: ...door use Use of a cord suitable for outdoor use reduces the risk of electric shock f If operating a power tool in a damp location is unavoidable use a ground fault circuit interrupter GFCI protected supply Use of a GFCI reduces the risk of electric shock Definitions Safety Guidelines The definitions below describe the level of severity for each signal word Please read the manual and pay attention t...

Page 2: ...your application The correct power tool will do the job better and safer at the rate for which it was designed b Do not use the power tool if the switch does not turn it on and off Any power tool that cannot be controlled with the switch is dangerous and must be repaired c Disconnect the plug from the power source and or the battery pack from the power tool before making any adjustments changing a...

Page 3: ...den wiring Contact with a live wire will also make exposed metal parts of the power tool live and shock the operator f When ripping always use a rip fence or straight edge guide This improves the accuracy of cut and reduces the chance of blade binding g Always use blades with correct size and shape diamond versus round of arbor holes Blades that do not match the mounting hardware of the saw will r...

Page 4: ...rrupting a cut for any reason release the trigger and hold the saw motionless in the material until the blade comes to a complete stop Never attempt to remove the saw from the work or pull the saw backward while the blade is in motion or kickback may occur Investigate and take corrective actions to eliminate the cause of blade binding c When restarting a saw in the workpiece center the saw blade i...

Page 5: ...n the skin may promote absorption of harmful chemicals WARNING Use of this tool can generate and or disperse dust which may cause serious and permanent respiratory or other injury Always use NIOSH OSHA approved respiratory protection appropriate for the dust exposure Direct particles away from face and body Always operate tool in well ventilated area and provide for proper dust removal Use dust co...

Page 6: ...attery pack or charger that has received a sharp blow been dropped run over or damaged in any way e g pierced with a nail hit with a hammer stepped on Damaged battery packs should be returned to the service center for recycling WARNING Fire hazard Do not store or carry the battery pack so that metal objects can contact exposed battery terminals For example do not place the battery pack in aprons p...

Page 7: ...Shock hazard Do not allow any liquid to get inside the charger Electric shock may result CAUTION Burn hazard To reduce the risk of injury charge only DEWALT rechargeable battery packs Other types of batteries may overheat and burst resulting in personal injury and property damage NOTICE Under certain conditions with the charger plugged into the power supply the charger can be shorted by foreign ma...

Page 8: ...charger with a damaged cord or plug Do not operate the charger if it has received a sharp blow been dropped or otherwise damaged in any way Take it to an authorized service center Do not disassemble the charger take it to an authorized service center when service or repair is required Incorrect reassembly may result in a risk of electric shock electrocution or fire Disconnect the charger from the ...

Page 9: ... may become warm to the touch while charging This is a normal condition and does not indicate a problem To facilitate the cooling of the battery pack after use avoid placing the charger or battery pack in a warm environment such as in a metal shed or an uninsulated trailer Indicator Light Operation PACK CHARGING PACK CHARGED x HOT COLD DELAY PROBLEM PACK OR CHARGER PROBLEM POWERLINE Charge Indicat...

Page 10: ...not freeze or immerse the charger in water or any other liquid WARNING Shock hazard Don t allow any liquid to get inside the charger Electric shock may result WARNING Burn hazard Do not submerge the battery pack in any liquid or allow any liquid to enter the battery pack Never attempt to open the battery pack for any reason If the plastic housing of the battery pack breaks or cracks return to a se...

Page 11: ...able limit the fuel gauge will not illuminate and the battery will need to be recharged NOTE The fuel gauge is only an indication of the charge left on the battery pack It does not indicate tool functionality and is subject to variation based on product components temperature and end user application For more information regarding fuel gauge battery packs please call 1 800 4 DEWALT 1 800 433 9258 ...

Page 12: ... clamp washer P on saw spindle with the large flat surface against the blade with beveled side facing out 4 Thread blade clamping screw H into saw spindle by hand screw has left hand threads and must be turned counterclockwise to tighten 5 Depress the blade lock button K while turning the saw spindle with the blade wrench N until the blade lock engages and the blade stops rotating Fig 5 6 Tighten ...

Page 13: ...y Never use the saw if the lower blade guard is missing damaged misassembled or not working properly Do not rely on the lower blade guard to protect you under all circumstances Your safety depends on following all warnings and precautions as well as proper operation of the saw Check lower blade guard for proper closing before each use as outlined in Further Safety Instructions for All Saws If the ...

Page 14: ...rrow strips as in ripping can cause kickback The cut off strip can sag or twist closing the kerf and pinching the blade E Snagging the lower guard on a surface below the material being cut momentarily reduces operator control The saw can lift partially out of the cut increasing the chance of blade twist 2 IMPROPER DEPTH OF CUT SETTING ON SAW To make the most efficient cut the blade should protrude...

Page 15: ... set the depth adjustment so that one half tooth of the blade will project below the material to be cut This distance is from the tip of the tooth to the bottom of the gullet in front of it This keeps blade friction at a minimum removes sawdust from the cut results in cooler faster sawing and reduces the chance of kickback A method for checking for correct cutting depth is shown in Figure 7 Lay a ...

Page 16: ...t of the saw Maintain a firm grip with both hands on the saw and position your body and arm to allow you to resist kickback if it occurs ALWAYS TURN OFF TOOL AND REMOVE BATTERY BEFORE MAKING ANY ADJUSTMENTS FIG 10 Figure 10 shows proper sawing position Note that hands are kept away from cutting area To avoid kickback DO support board or panel NEAR the cut Fig 11 DON T support board or panel away f...

Page 17: ...er blade guard will automatically close under the blade Remember the blade is exposed until this occurs Never reach under the work for any reason When you have to retract the lower blade guard manually as is necessary for starting pocket cuts always use the retracting lever WARNING When cutting thin strips be careful to ensure that small cutoff pieces don t hang up on the inside of the lower blade...

Page 18: ...cation Self lubricating ball and roller bearings are used in the tool and relubrication is not required However it is recommended that once a year you take or send the tool to a certified service center for a thorough cleaning inspection and lubrication of the gear case Accessories WARNING Since accessories other than those offered by DEWALT have not been tested with this product use of such acces...

Page 19: ...arts caused by normal use for free any time during the first year after purchase 2 YEARS FREE SERVICE ON DEWALT BATTERY PACKS DC9071 DC9091 DC9096 DC9280 DC9360 DC9180 DCB120 DCB127 DCB201 DCB203 and DCB207 3 YEARS FREE SERVICE ON DEWALT BATTERY PACKS DCB200 DCB204 DCB205 DEWALT BATTERY PACKS Product warranty voided if the battery pack is tampered with in any way DEWALT is not responsible for any ...

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