Owner's Manual & Safety Instructions

Battery and Charger Sold Separately



Model

HCB721B

Owner’s Manual &

Safety Instructions



WARNING:        

.

When unpacking, make sure that the product is intact and undamaged.

If any parts are missing or broken, please call 1-888-866-5797

as soon as possible. Reference 193175418807.

Page 2  Item 57612

IMPORTANT SAFETY INFORMATION

General Power Tool Safety Warnings





Failure to follow all instructions listed below may

result in electric shock, fire and/or serious injury.





The term “power tool” in the warnings refers

to your mains-operated (corded) power tool or

battery-operated (cordless) power tool.

1. 

a. 

Cluttered or dark areas invite accidents.

b. 



Power tools

create sparks which may ignite the dust or fumes.

c. 

Distractions

can cause you to lose control.

2. 

a. 





Unmodified plugs and matching

outlets will reduce risk of electric shock.

b. 



There is an increased risk of

electric shock if your body is earthed or grounded.

c. 

Water entering a power tool

will increase the risk of electric shock.

d. 





Damaged or entangled

cords increase the risk of electric shock.

e. 



Use of a cord suitable for outdoor

use reduces the risk of electric shock.

f. 



Use of

a GFCI reduces the risk of electric shock.

3. 

a. 







A moment

of inattention while operating power tools

may result in serious personal injury.

b. 

Protective equipment

such as dust mask, non-skid safety shoes, hard

hat, or hearing protection used for appropriate

conditions will reduce personal injuries.

c. 





Carrying power tools

with your finger on the switch or energizing power

tools that have the switch on invites accidents.

d. 

A wrench

or a key left attached to a rotating part of the

power tool may result in personal injury.

e. 

 This enables better control

of the power tool in unexpected situations.

f. 



Loose clothes, jewelry

or long hair can be caught in moving parts.

g. 



Use of

dust collection can reduce dust-related hazards.

h. 





A careless action can cause severe

injury within a fraction of a second.

i. Only use safety equipment that has been

approved by an appropriate standards agency.

Unapproved safety equipment may not provide

adequate protection. Eye protection must be

ANSI-approved and breathing protection

must be NIOSH-approved for the

specific hazards in the work area.

j. Do not lay the tool down until it has come to

a complete stop. Moving parts can grab the

surface and pull the tool out of your control.

k. When using a handheld power tool,

maintain a firm grip on the tool with both

hands to resist starting torque.

l. Do not depress the spindle lock when

starting or during operation.

Page 3Item 57612

m. Do not leave the tool unattended when the

Battery Pack is connected. Turn off the tool,

and remove the Battery Pack before leaving.

n. This product is not a toy.

Keep it out of reach of children.

o. People with pacemakers should consult their

physician(s) before use. Electromagnetic fields in

close proximity to heart pacemaker could cause

pacemaker interference or pacemaker failure.

p. The warnings, precautions, and instructions

discussed in this instruction manual cannot

cover all possible conditions and situations

that may occur. It must be understood by the

operator that common sense and caution are

factors which cannot be built into this product,

but must be supplied by the operator.

4. 

a. 

The correct

power tool will do the job better and safer

at the rate for which it was designed.

b. 

Any power

tool that cannot be controlled with the switch

is dangerous and must be repaired.

c. 









Such preventive safety measures reduce the

risk of starting the power tool accidentally.

d. 





Power tools are

dangerous in the hands of untrained users.

e. 









Many accidents are

caused by poorly maintained power tools.

f. Properly

maintained cutting tools with sharp cutting edges

are less likely to bind and are easier to control.

g. 





Use of the

power tool for operations different from those

intended could result in a hazardous situation.

h. 



Slippery handles and grasping surfaces

do not allow for safe handling and control

of the tool in unexpected situations.

5. 

a. 



This will ensure that

the safety of the power tool is maintained.

b. Maintain labels and nameplates on the tool.

These carry important safety information.

If unreadable or missing, contact

Harbor Freight Tools for a replacement.

6. 

a. 

Keep your



 If both hands are holding

the saw, they cannot be cut by the blade.

b. 

The guard cannot protect you from

the blade below the workpiece.

c. 

Less than a full tooth of the blade

teeth should be visible below the workpiece.

d. 



 It is important

to support the work properly to minimise body

exposure, blade binding, or loss of control.

e. 





Contact with a “live” wire will also

make exposed metal parts of the power tool “live”

and could give the operator an electric shock.

f. 

This improves the accuracy

of cut and reduces the chance of blade binding.

g. 

Blades

that do not match the mounting hardware of the

saw will run off-center, causing loss of control.

h. 

The blade washers and

bolt were specially designed for your saw, for

optimum performance and safety of operation.

7. 

- kickback is a sudden reaction to a pinched,

jammed or misaligned saw blade, causing

an uncontrolled saw to lift up and out of

the workpiece toward the operator;

- when the blade is pinched or jammed

tightly by the kerf closing down, the blade

stalls and the motor reaction drives the

unit rapidly back toward the operator;

- if the blade becomes twisted or misaligned

in the cut, the teeth at the back edge of the

blade can dig into the top surface of the

wood causing the blade to climb out of the

kerf and jump back toward the operator.

Page 4  Item 57612

Kickback is the result of saw misuse and/or incorrect

operating procedures or conditions and can be avoided

by taking proper precautions as given below.

a. 







Kickback could cause the saw to jump backwards,

but kickback forces can be controlled by the

operator, if proper precautions are taken.

b. 













 Investigate and take corrective actions

to eliminate the cause of blade binding.

c. 





If a saw blade binds, it may walk up or kickback

from the workpiece as the saw is restarted.

d. 

Large panels tend

to sag under their own weight. Supports must

be placed under the panel on both sides, near

the line of cut and near the edge of the panel.

e. 

Unsharpened or improperly set blades

produce narrow kerf causing excessive

friction, blade binding and kickback.

f. 



If blade adjustment shifts while

cutting, it may cause binding and kickback.

g. 

The protruding

blade may cut objects that can cause kickback.

8. 

a. 

the



guard

 If the saw is accidentally

dropped, the lower guard may be bent. Raise the

lower guard with the retracting handle and make

sure it moves freely and does not touch the blade

or any other part, in all angles and depths of cut.

b. 





 Lower guard may

operate sluggishly due to damaged parts,

gummy deposits, or a build-up of debris.

c. 









 For all other sawing, the

lower guard should operate automatically.

d. 



An

unprotected, coasting blade will cause the

saw to walk backwards, cutting whatever is

in its path. Be aware of the time it takes for

the blade to stop after switch is released.

9. 

a. Ensure the

switch is in the off-position before connecting

to battery pack, picking up or carrying the

power tool. Carrying the power tool with your

finger on the switch or energizing power tool

that have the switch on invites accidents.

b. 





Such preventive safety measures reduce the

risk of starting the power tool accidentally.

c. 

A charger that is suitable

for one type of battery pack may create a risk

of fire when used with another battery pack.

d. 

Use of any other

battery packs may create a risk of injury and fire.

e. 







Shorting the battery

terminals together may cause burns or a fire.

f. 



If contact accidentally occurs, flush with

water. If liquid contacts eyes, additionally

seek medical help. Liquid ejected from the

battery may cause irritation or burns.

g. 

Damaged or modified

batteries may exhibit unpredictable behavior

resulting in fire, explosion or risk of injury.

h. 

Exposure to fire

or temperature above 265°F may cause explosion.

i. 





Charging improperly or at

temperatures outside of the specified range may

damage the battery and increase the risk of fire.

Page 5Item 57612

j. 



This will ensure that

the safety of the product is maintained.

k. 





l. The battery Charger gets hot during

use. The Charger’s heat can build

up to unsafe levels and create a fire

hazard if it does not receive adequate

ventilation, due to an electrical fault, or if it is used

in a hot environment. Do not place the Charger

on a flammable surface. Do not obstruct any

vents on the Charger. 





Place the Charger on a

stable, solid, nonflammable surface (such as a

stable metal workbench or concrete floor) at least

1 foot away from all flammable objects, such as

drapes or walls. Keep a fire extinguisher and a

smoke detector in the area. Frequently monitor

the Charger and Battery Pack while charging.

m. 



10. 









a. 

b. 



• 

• 

• 

• 

• 

• 

c. Charge Battery Pack only according

to its Charger’s instructions.

d. Inspect Battery Pack before every use;

do not use or charge if damaged.

11. 

This tool vibrates during use.

Repeated or long-term exposure to vibration may

cause temporary or permanent physical injury,

particularly to the hands, arms and shoulders.

To reduce the risk of vibration-related injury:

a. Anyone using vibrating tools regularly or for

an extended period should first be examined

by a doctor and then have regular medical

check-ups to ensure medical problems are not

being caused or worsened from use. Pregnant

women or people who have impaired blood

circulation to the hand, past hand injuries,

nervous system disorders, diabetes, or

Raynaud’s Disease should not use this tool.

If you feel any symptoms related to vibration

(such as tingling, numbness, and white or blue

fingers), seek medical advice as soon as possible.

b. Do not smoke during use. Nicotine reduces

the blood supply to the hands and fingers,

increasing the risk of vibration-related injury.

c. Wear suitable gloves to reduce the

vibration effects on the user.

d. Use tools with the lowest vibration

when there is a choice.

e. Include vibration-free periods each day of work.

f. Grip tool as lightly as possible (while still keeping

safe control of it). Let the tool do the work.

g. To reduce vibration, maintain the tool as

explained in this manual. If any abnormal

vibration occurs, stop use immediately.

Grounding

 

 

 

 















Extension Cords

Note: Extension cords must not be

used with this item’s Charger.

Page 6  Item 57612

Symbology

Volts

Direct Current

Amperes

xxxx/min.

No Load Revolutions per Minute (RPM)

WARNING marking concerning Risk

of Eye Injury. Wear ANSI-approved

safety goggles with side shields.

Read the manual before set-up and/or use.

Keep hands clear of fence area.

DANGER marking concerning

Risk of Amputation.

Keep hands well clear of cutting area.

Warning Symbols and Definitions































SPECIFICATIONS

Battery Type

20V Li-Ion 57373

57306 Hercules

(sold separately)

Charger Type

20V Li-Ion 56224

56559 56561 Hercules

(sold separately)

Spindle No Load Speed 5000 RPM

Max. Accessory Diameter 7-1/4"

Arbor 5/8" Round

Max. Depth of Cut 45°: 1-7/8" • 90°: 2-1/2"

SET UP - BEFORE USE

Read the  









Note: For additional information regarding the

parts listed in the following pages, refer to the

Assembly Diagram near the end of this manual.

Assembly

1. To attach the Dust Chute, align the mounting

hole on the Dust Chute with the threaded

hole on the Upper Blade Guard.

2. Insert mounting screw into hole and tighten securely.

Charging

Charge battery before using this tool. Follow

instructions included with battery charger. Battery

pack and charger sold separately.

Work Area

1. Designate a work area that is clean and well lit.

The work area must not allow access by children

or pets to prevent distraction and injury.

2. There must not be objects, such as utility lines,

nearby that will present a hazard while working.

Saw Blade Selection

1. Any saw blade that will be used must be

marked as suitable for the material to be cut.

2. Use only a saw blade diameter in accordance

with the markings on the saw. See

specification table for the bore diameter.

3. Use only saw blades that are marked with a speed

equal or higher than the speed marked on the tool.

Guard Setup

Check that the Lower Blade Guard is in place,

moves freely, and closes instantly.

Dust Extraction Setup

Connect a dust collection system (sold separately)

to the Dust Chute.

Page 7Item 57612

Functions

Upper Blade

Guard

Depth

Gauge Lever

Bevel





Key

Rip





Battery

Slot

Trigger



Blade





Flange



Blade Guard

Blade

Bolt



Blade

Guard

Lever







Plate

Main Handle



Handle



Chute

Page 8  Item 57612

OPERATING INSTRUCTIONS

Read the  









Tool Changing









T











1. Hold in Spindle Lock, located behind Upper Blade

Guard, while removing the Blade Bolt using the

Hex Key, turning Bolt .

2. Remove the Outer Flange.

3. Use the Lower Blade Guard Lever to

raise the Guard and remove the blade.

Leave the Inner Flange in place.

4. Install the new blade (sold separately) with the

directional arrow on the blade pointing the same as

the directional arrow on the Lower Blade Guard.

5. Place Outer Flange on Spindle, recessed side first.

Hold in Spindle Lock while using the Hex Key to

replace the Blade Bolt, turning it .

Setting and Testing









Adjusting Depth

1. Set the Base Plate flat against the

edge of the workpiece.

2. Pull the Depth Gauge Lever up to unlock.

3. Hold Base Plate down with one hand and

raise or lower Saw with the other hand until

the Blade is at the desired depth of cut,

using the Depth Gauge as a guide.

4. Push Depth Gauge Lever down to lock.

WARNING! 





Adjusting Bevel

1. Loosen the Bevel Lock Knob to allow

the angle of cut to be adjusted.

2. Use the Bevel Scale to set the desired angle.

3. After adjustment, tighten the Bevel Lock Knob.

Workpiece Set Up

1. Workpiece selection:

a. Workpiece must be wood, free of

foreign objects and loose knots.

b. Do not use to cut logs, tree limbs,

or uneven lumber.

c. Wet lumber, green (unseasoned) lumber,

and pressure treated lumber all have an

increased potential for kickback and should

only be cut with a blade designed for cutting

that lumber. Wear a NIOSH-approved

respirator and have appropriate ventilation

whenever cutting pressure treated lumber.

Note: Use caution to avoid overheating the cutting tips.

2. Secure loose workpieces using a vise or clamps

(not included) to prevent movement while working.

3. Refer to cutting capacities in the Specifications Table

on page 6 for limitations on workpiece size.

General Instructions for Use

1. Make all necessary adjustments to the Circular Saw.

2. 





3. Make sure that the Trigger is in the off-position, then

attach a 20V Hercules Battery Pack (sold separately).

4. Firmly grip the Main Handle with one hand and

the Auxiliary Handle with the other hand.

5. Press and hold Trigger Lock, then

the Trigger to turn on the Saw.

6. Release Trigger Lock. Allow the Saw Blade to

reach full speed before contacting the workpiece.

7. Make straight cuts only. DO NOT twist Saw while

cutting. If this occurs, the Saw Blade will “bind” in

the workpiece causing kickback, potential injury,

and/or damage to the workpiece and Circular Saw.

8. Do not force the Saw to cut faster than

it is designed to cut. Feed the Saw

Blade gradually into the workpiece.

9. Release Trigger if the Saw Blade is to be backed

out of an uncompleted cut. Wait until the Saw

Blade stops spinning before removing the Saw.

Do not press against the Saw Blade to stop it.

10. After completing the cut, release the Trigger

and wait until the Saw Blade stops spinning.

11. To prevent accidents, turn off the tool and

remove its Battery Pack after use. Clean, then

store the tool indoors out of children’s reach.

Page 9Item 57612

MAINTENANCE AND SERVICING

 























Cleaning, Maintenance,

and Lubrication

1.  inspect the general

condition of the tool. Check for:

• leaking, swollen, or cracked battery pack

• loose hardware

• misalignment or binding of moving parts

• cracked or broken parts

• damaged electrical wiring

• any other condition that may

affect its safe operation.

2.  wipe external surfaces of the tool

with clean cloth. Wipe surfaces of upper and lower

blade guards with a dry clean cloth. Keep hands

and body away from blade while cleaning surfaces.

3. For blade changing instructions see

Tool Changing on page 8.

4. Disconnect battery pack and store battery pack,

charger, and tool in dry, indoor area out of

reach of children and away from metal objects

(i.e., paperclips, coins) to prevent shorting.

5. Li-Ion BATTERY MUST BE RECYCLED OR

DISPOSED OF PROPERLY.

Do not short, incinerate or open battery.

Troubleshooting

  

Tool will

not start.

1. Battery Pack not properly

connected.

2. Battery Pack not

properly charged.

3. Battery Pack worn out.

4. Internal damage or wear.

1. Remove Battery Pack, make sure there are no

obstructions, reinsert the Battery Pack according

to its shape (it should only fit one way), and press

firmly until the Battery Pack locks in place.

2. Make sure Charger is connected and operating properly.

Give enough time for Battery Pack to recharge properly.

3. Dispose of old Battery Pack properly or recycle.

Replace Battery Pack.

4. Have technician service tool.

Tool operates

slowly.

1. Forcing tool to work too fast.

2. Battery Pack power low.

3. Battery Pack wearing out.

1. Allow tool to work at its own rate.

2. Recharge Battery Pack.

3. Dispose of old Battery Pack properly or recycle.

Replace Battery Pack.

Performance

decreases

over time.

1. Blade dull or damaged.

2. Battery Pack wearing out.

1. Keep cutting Blades sharp. Replace as needed.

2. Battery Pack capacity will gradually decrease through use.

If symptoms are severe, recycle old Battery

Pack (or dispose of properly) and replace it.

Excessive noise

or rattling.

Internal damage or wear. (Carbon

brushes or bearings, for example.)

Have technician service tool.

Overheating. 1. Forcing tool to work too fast.

2. Blade dull or damaged.

3. Blocked motor housing vents.

1. Allow tool to work at its own rate.

2. Keep cutting Blades sharp. Replace as needed.

3. Wear ANSI-approved safety goggles and

NIOSH-approved dust mask/respirator while

blowing dust out of motor using compressed air.

 



Page 10  Item 57612

PLEASE READ THE FOLLOWING CAREFULLY

THE MANUFACTURER AND/OR DISTRIBUTOR HAS PROVIDED THE PARTS LIST AND ASSEMBLY DIAGRAM

IN THIS MANUAL AS A REFERENCE TOOL ONLY. NEITHER THE MANUFACTURER OR DISTRIBUTOR

MAKES ANY REPRESENTATION OR WARRANTY OF ANY KIND TO THE BUYER THAT HE OR SHE IS

QUALIFIED TO MAKE ANY REPAIRS TO THE PRODUCT, OR THAT HE OR SHE IS QUALIFIED TO REPLACE

ANY PARTS OF THE PRODUCT. IN FACT, THE MANUFACTURER AND/OR DISTRIBUTOR EXPRESSLY

STATES THAT ALL REPAIRS AND PARTS REPLACEMENTS SHOULD BE UNDERTAKEN BY CERTIFIED AND

LICENSED TECHNICIANS, AND NOT BY THE BUYER. THE BUYER ASSUMES ALL RISK AND LIABILITY

ARISING OUT OF HIS OR HER REPAIRS TO THE ORIGINAL PRODUCT OR REPLACEMENT PARTS

THERETO, OR ARISING OUT OF HIS OR HER INSTALLATION OF REPLACEMENT PARTS THERETO.

PARTS LIST AND DIAGRAM

Parts List

Part  Qty

1 Blade Bolt 1

2 Outer Flange 1

3 Inner Flange 1

4 Retaining Ring 1

5 Lower Blade Guard Lever 1

6 Lower Blade Guard 1

7 Torsion Spring 1

8 Hex Socket Screw 1

9 Vibration Reduction Set 1

10 Dust Chute 1

11 Pan Head Screw 13

12 Shroud 1

13 Cylindrical Pin 1

14 Right Upper Blade Guard 1

15 Needle Bearing 1

16 Left Upper Blade Guard 1

17 Protective Cover 1

18 Spring 1

19 Spindle Lock Pin 1

20 Spindle Lock Button 1

21 Countersunk Head Screw 4

22 Oil Seal 1

23 End Cover Components 1

23.1 End Cover 1

23.2 Deep Groove Ball Bearing 2

23.3 Wave Washer 1

23.4 Retaining Ring 1

23.5 Spindle 1

23.6 Gear 1

23.7 Retaining Ring 1

24 Self Tapping Screw 2

25 Cylindrical Pin 2

26 Hook 1

27 Mounting Sleeve 1

28 Washer 1

29 Compression Spring 1

30 Hook Bracket 1

31 Rotor Assembly 1

Part  Qty

32 Upper Motor Housing 1

33 Stator Assembly 1

34 Trigger Lock 1

35 Trigger Lock Spring 1

36 Cylindrical Pin 1

37 Electronics Assembly 1

38 Screw 2

39 Right Housing 1

40 Left Housing 1

41 Pan Head Self Tapping Screw 13

42 Pan Head Screw 2

43 Base Plate Assembly 1

43.1 Guide Ruler 1

43.2 Bevel Angle Bracket 1

43.3 Rip Fence Knob 1

43.4 Screw 1

43.5 Washer 1

43.6 Bevel Lock Knob 1

43.7 Bevel Scale 1

43.8 Countersunk Head Screw 4

43.9 Rivet 1

43.10 Spring 1

43.11 Washer 2

43.12 Set Screw 2

43.13 Spring 1

43.14 Rivet 1

43.15 Guide Bracket 1

43.16 Base Plate 1

43.17 Rivet 1

44 Lower Motor Housing 1

45 Deep Groove Ball Bearing 1

46 Hex Key 1

47 Screw 1

48 Washer 1

49 Screw 1

50 Depth Gauge Lever 1

51 Blade 1

52 Trigger Assembly 1

Page 11Item 57612

Assembly Diagram



Note: If product has no serial number, record month and year of purchase instead.

Note: Some parts are listed and shown for illustration purposes only, and are not available

individually as replacement parts. Specify UPC 193175418807 when ordering parts.









2020 by Harbor Freight Tools

any artwork contained herein may be reproduced in any shape or form without the express

written consent of Harbor Freight Tools. Diagrams within this manual may not be drawn

proportionally. Due to continuing improvements, actual product may differ slightly from the

product described herein. Tools required for assembly and service may not be included.

LIMITED 90 DAY WARRANTY

Harbor Freight Tools Co. makes every effort to assure that its products meet high quality and durability standards,

and warrants to the original purchaser that this product is free from defects in materials and workmanship for the

period of 90 days from the date of purchase. This warranty does not apply to damage due directly or indirectly,

to misuse, abuse, negligence or accidents, repairs or alterations outside our facilities, criminal activity, improper

installation, normal wear and tear, or to lack of maintenance. We shall in no event be liable for death, injuries

to persons or property, or for incidental, contingent, special or consequential damages arising from the use of

our product. Some states do not allow the exclusion or limitation of incidental or consequential damages, so the

above limitation of exclusion may not apply to you. THIS WARRANTY IS EXPRESSLY IN LIEU OF ALL OTHER

WARRANTIES, EXPRESS OR IMPLIED, INCLUDING THE WARRANTIES OF MERCHANTABILITY AND FITNESS.

To take advantage of this warranty, the product or part must be returned to us with transportation charges

prepaid. Proof of purchase date and an explanation of the complaint must accompany the merchandise.

If our inspection verifies the defect, we will either repair or replace the product at our election or we may

elect to refund the purchase price if we cannot readily and quickly provide you with a replacement. We will

return repaired products at our expense, but if we determine there is no defect, or that the defect resulted

from causes not within the scope of our warranty, then you must bear the cost of returning the product.

This warranty gives you specific legal rights and you may also have other rights which vary from state to state.