Page 1
Model
HCB42B
Owner’s Manual &
Safety Instructions
Battery and Charger Sold Separately
20V Brushless Oscillating Multi-Tool
WARNING: To prevent serious injury, User must read and
understand Owner’s Manual. SAVE THIS MANUAL.
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
57319.
Page 2
IMPORTANT SAFETY INFORMATION
GENERAL POWER TOOL SAFETY WARNINGS
Read all safety warnings and all instructions.
Failure to follow the warnings and instructions may
result in electric shock, fire and/or serious injury. Save
all warnings and instructions for future reference.
The term ″power tool″ in the warnings refers to your
battery-operated (cordless) power tool.
Work Area Safety
1. Keep work area clean and well lit.
Cluttered or dark areas invite accidents.
2. Do not operate power tools in explosive
atmospheres, such as in the presence of
flammable liquids, gases or dust. Power tools
create sparks which may ignite the dust or fumes.
3. Keep children and bystanders
away while operating a power tool.
Distractions can cause you to lose control.
Electrical Safety
1. Power tool plugs must match the outlet.
Never modify the plug in any way. Do not use
any adapter plugs with earthed (grounded)
power tools. Unmodified plugs and matching
outlets will reduce risk of electric shock.
2. Avoid body contact with earthed or grounded
surfaces, such as pipes, radiators, ranges
and refrigerators. There is an increased risk of
electric shock if your body is earthed or grounded.
3. Do not expose power tools to rain or wet
conditions. Water entering a power tool
will increase the risk of electric shock.
4. Do not abuse the cord. Never use the cord
for carrying, pulling or unplugging the power
tool. Keep cord away from heat, oil, sharp
edges or moving parts. Damaged or entangled
cords increase the risk of electric shock.
5. When operating a power tool outdoors,
use an extension cord suitable for outdoor
use. Use of a cord suitable for outdoor
use reduces the risk of electric shock.
6. 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.
Personal Safety
1. Stay alert, watch what you are doing and use
common sense when operating a power tool.
Do not use a power tool while you are tired
or under the influence of drugs, alcohol or
medication. A moment of inattention while operating
power tools may result in serious personal injury.
2. Use personal protective equipment. Always wear
eye protection. Protective equipment such
as dust mask, non-skid safety shoes, hard hat,
or hearing protection used for appropriate
conditions will reduce personal injuries.
3. Prevent unintentional starting. Ensure the Switch
is in the off-position before connecting to
power source, picking up or carrying the tool.
Carrying power tools with your finger on
the Switch or energizing power tools that
have the Switch on invites accidents.
4. Remove any adjusting key or wrench
before turning the power tool on. A wrench
or a key left attached to a rotating part of the
power tool may result in personal injury.
5. Do not overreach. Keep proper footing and
balance at all times. This enables better control
of the power tool in unexpected situations.
6. Dress properly. Do not wear loose clothing or
jewelry. Keep your hair, clothing and gloves
away from moving parts. Loose clothes, jewelry
or long hair can be caught in moving parts.
7. If devices are provided for the connection of
dust extraction and collection facilities, ensure
these are connected and properly used. Use of
dust collection can reduce dust-related hazards.
8. Do not let familiarity gained from frequent use
of tools allow you to become complacent and
ignore tool safety principles. A careless action
can cause severe injury within a fraction of a second.
9. 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.
a. 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.
b. When using a handheld power tool,
maintain a firm grip on the tool with both
hands to resist starting torque.
Page 2 For technical questions, please call 1-888-866-5797. Item 57319
Page 3
10. Do not leave the tool unattended when the
Battery Pack is connected. Turn off the tool,
and remove the Battery Pack before leaving.
11. This product is not a toy.
Keep it out of reach of children.
12. 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.
13. 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.
Power Tool Use and Care
1. Do not force the power tool. Use the
correct power tool for your application.
The correct power tool will do the job better and
safer at the rate for which it was designed.
2. 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.
3. Disconnect the battery pack from the
power tool before making any adjustments,
changing accessories, or storing power
tools. Such preventive safety measures reduce
the risk of starting the power tool accidentally.
4. Store idle power tools out of the reach of
children and do not allow persons unfamiliar
with the power tool or these instructions
to operate the power tool. Power tools are
dangerous in the hands of untrained users.
5. Maintain power tools and accessories. Check
for misalignment or binding of moving
parts, breakage of parts and any other
condition that may affect the power tool’s
operation. If damaged, have the power tool
repaired before use. Many accidents are
caused by poorly maintained power tools.
6. Keep cutting tools sharp and clean. Properly
maintained cutting tools with sharp cutting edges
are less likely to bind and are easier to control.
7. Use the power tool, accessories and tool bits
etc. in accordance with these instructions,
taking into account the working conditions
and the work to be performed. Use of the
power tool for operations different from those
intended could result in a hazardous situation.
8. Keep handles and grasping surfaces dry, clean
and free from oil and grease. Slippery handles
and grasping surfaces do not allow for safe handling
and control of the tool in unexpected situations.
Service
1. Have your power tool serviced by a qualified
repair person using only identical replacement
parts.
This will ensure that the safety of
the power tool is maintained.
2. Maintain labels and nameplates on the tool.
These carry important safety information.
If unreadable or missing, contact
Harbor Freight Tools for a replacement.
Belt Sander and Drum
Sander Safety Warnings
Hold the power tool by insulated gripping surfaces,
because the sanding surface may contact
its own cord. Cutting a “live” wire may make
exposed metal parts of the power tool “live” and
could give the operator an electric shock.
Battery Tool Use and Care
1. Prevent unintentional starting. 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.
2. Disconnect the battery pack from the
power tool before making any adjustments,
changing accessories, or storing power tool.
Such preventive safety measures reduce the
risk of starting the power tool accidentally.
3. Recharge only with the charger specified by
the manufacturer. A charger that is suitable
for one type of battery pack may create a risk
of fire when used with another battery pack.
4. Use power tools only with specifically
designated battery packs. Use of any other
battery packs may create a risk of injury and fire.
5. When battery pack is not in use, keep it away
from other metal objects, like paper clips,
coins, keys, nails, screws or other small metal
objects, that can make a connection from
one terminal to another. Shorting the battery
terminals together may cause burns or a fire.
6. Under abusive conditions, liquid may be ejected
from the battery; avoid contact. 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.
7. Do not use a battery pack or power tool that
is damaged or modified. Damaged or modified
batteries may exhibit unpredictable behavior
resulting in fire, explosion or risk of injury.
Page 3For technical questions, please call 1-888-866-5797.Item 57319
Page 4
8. Do not expose a battery pack or power tool to
fire or excessive temperature. Exposure to fire or
temperature above 265°F may cause explosion.
9. Follow all charging instructions and do
not charge the battery pack or power tool
outside of the temperature range specified
in the instructions. Charging improperly or at
temperatures outside of the specified range may
damage the battery and increase the risk of fire.
10. Have servicing performed by a qualified
repair person using only identical
replacement parts. This will ensure that
the safety of the product is maintained.
11. Do not modify or attempt to repair the power
tool or the battery pack except as indicated
in the instructions for use and care.
12. 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. Especially avoid placing
the Charger on carpets and rugs; they are not
only flammable, but they also obstruct vents
under 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.
Lithium Battery Safety Warnings
LITHIUM BATTERIES
STORE A LARGE AMOUNT
OF ENERGY AND WILL
VENT FIRE OR EXPLODE IF MISTREATED:
1. Keep Battery Pack dry.
2. DO NOT DO ANY OF THE FOLLOWING
TO THE BATTERY PACK:
• Open,
• Drop,
• Short-circuit,
• Puncture,
• Incinerate, or
• Expose to temperatures greater than 140°F.
3. Charge Battery Pack only according to instructions.
4. Inspect Battery Pack before every use;
do not use or charge if damaged.
Vibration Safety
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:
1. 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 medical or
physical symptoms related to vibration (such as
tingling, numbness, and white or blue fingers),
seek medical advice as soon as possible.
2. Do not smoke during use. Nicotine reduces
the blood supply to the hands and fingers,
increasing the risk of vibration-related injury.
3. Wear suitable gloves to reduce the
vibration effects on the user.
4. Use tools with the lowest vibration when there
is a choice between different processes.
5. Include vibration-free periods each day of work.
6. Grip tool as lightly as possible (while still keeping
safe control of it). Let the tool do the work.
7. To reduce vibration, maintain the tool as
explained in this manual. If any abnormal
vibration occurs, stop use immediately.
SAVE THESE
INSTRUCTIONS.
GROUNDING
TO PREVENT ELECTRIC SHOCK AND
DEATH FROM
INCORRECT GROUNDING:
Check with a qualified electrician if you
are in doubt as to whether the outlet is properly
grounded. Do not modify the power cord plug
provided with the tool. Never remove the grounding
prong from the plug. Do not use the tool if the
power cord or plug is damaged. If damaged, have it
repaired by a service facility before use. If the plug
will not fit the outlet, have a proper outlet installed
by a qualified electrician.
Page 4 For technical questions, please call 1-888-866-5797. Item 57319
Page 5
Extension Cords
Note: Extension cords must not be
used with this item’s Charger.
Warning Symbols and Definitions
This is the safety alert symbol. It is used to
alert you to potential personal injury hazards.
Obey all safety messages that follow this symbol to
avoid possible injury or death.
Indicates a hazardous
situation which, if not
avoided, will result in death or serious injury.
Indicates a hazardous
situation which, if not
avoided, could result in death or serious injury.
Indicates a hazardous
situation which, if not
avoided, could result in minor or moderate injury.
Addresses practices not
related to personal injury.
Symbology
Specifications
Battery Type
No Load Speed 8,000 - 19,000 OPM
Hercules 20V Li-ion
(sold separately)
Setup - Before Use
TO PREVENT SERIOUS INJURY FROM
ACCIDENTAL OPERATION:
Make sure that the Switch is in the OFF position and
Battery Pack before performing any procedure in
this section.
Battery Charging
Charge battery after unpacking and before
using this tool. Follow instructions included
with battery charger (sold separately).
Functional Description
V
A
n0 xxxx/min.
Double Insulated
Volts
Direct Current
Amperes
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.
WARNING marking concerning
Risk of Hearing Loss.
Wear hearing protection.
WARNING marking
concerning Risk of Fire.
Do not cover Charger
ventilation ducts.
Charge on fireproof surface only.
WARNING marking concerning
Risk of Electric Shock.
Properly connect Charger’s power
cord to appropriate outlet.
2
1
3
1. Release Lever
2. Power Switch
3. Variable Speed Dial
Page 5For technical questions, please call 1-888-866-5797.Item 57319
Page 6
OPERATING INSTRUCTIONS
Read the ENTIRE IMPORTANT
SAFETY INFORMATION section at the
beginning of this manual including
all text under subheadings therein
before set up or use of this product.
Accessory Installation
1. Flip the Release Lever forward to the open position
in order to remove the Flange Assembly.
Release
Lever
Workpiece and Work Area Set Up
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. Secure loose workpieces using a vise or clamps
(not included) to prevent movement while working.
3. There must not be hazardous objects, such
as utility lines or foreign objects, nearby that
will present a hazard while working.
4. You must use personal safety equipment including,
but not limited to, ANSI-approved eye and hearing
protection, as well as heavy-duty work gloves.
General Operation
Saw
Blade
2. Install the desired accessory, Saw Blade shown,
by inserting onto the Shaft fitting pins.
3. Reattach the Flange Assembly and hold in place
momentarily to keep the accessory secure.
Note: Accessories included are wood blade,
saw blade, sanding pad, and sandpaper.
Note: Accessories may be mounted at angles
up to 90° left or right of straight ahead.
Note: The Saw Blade should only be
used in the straight ahead position.
CAUTION! When attaching the Saw Blade,
orient the accessory so that the blade faces
AWAY from the handle to avoid injury.
4. Flip the Release Lever back to original
position to secure accessory.
5. After securing, the attachment should not move
on the Spindle. If it can move with the power off,
reattach it, making sure that the holes on the
attachment line up with the fitting pins on the Shaft.
Note: For sanding, first attach the Sanding Pad to the
tool, then align a sheet of Sandpaper over the pad and
press into place. Once a Sandpaper corner becomes
worn, turn it 120° or replace the sheet with a new one.
Flange
Assembly
To prevent serious injury: Grip the
tool firmly in both hands.
1. Make sure that the Power Switch is in the
off-position, then plug in the tool.
2. Hold the Tool with both hands and slide
the Power Switch forward to activate.
3. Adjust the speed of the tool using the Speed
Control Dial. There are six speed settings from 1
(slowest) to 6 (fastest). Determine the optimum
speed by testing on a scrap piece of material.
4. Do not allow contact between Sandpaper
or Blade and workpiece until the tool is
running at the intended speed.
5. Avoid contact with foreign objects such as metal
screws and nails when sanding, scraping, or cutting.
6. Do not apply excessive pressure on the
Tool. Allow the Tool to do the work.
7. When finished, slide the Power Switch to OFF. Allow
the tool to stop completely before setting it down.
8. To prevent accidents, turn off the tool and
unplug it after use. Clean, then store the
tool indoors out of children’s reach.
MAINTENANCE AND SERVICING
Procedures not specifically explained
in this manual must be performed
only by a qualified technician.
TO PREVENT SERIOUS INJURY FROM
ACCIDENTAL OPERATION:
Make sure that the Switch is locked and Battery
Pack is removed before performing any procedure in
this section.
Page 6 For technical questions, please call 1-888-866-5797. Item 57319
Page 7
TO PREVENT SERIOUS INJURY FROM TOOL
FAILURE:
Do not use damaged equipment.
If abnormal noise or vibration occurs, have
the problem corrected before further use.
Cleaning, Maintenance,
and Lubrication
1. BEFORE EACH USE, inspect the general
condition of the tool. Check for:
• leaking, swollen, or cracked battery pack
• loose hardware
2. AFTER USE, wipe external surfaces
of the tool with clean cloth.
3. Periodically blow dust and grit out of the motor
vents using dry compressed air. Wear ANSIapproved safety goggles and NIOSH-approved
breathing protection while doing this.
4. Li-Ion BATTERY MUST BE RECYCLED OR
DISPOSED OF PROPERLY.
Do not short, incinerate or open battery.
5. 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.
• misalignment or binding of moving parts
• cracked or broken parts
• any other condition that may
affect its safe operation.
Troubleshooting
Problem Possible Causes Likely Solutions
Tool will not start. 1. Cord not connected.
Tool operates slowly. 1. Excess pressure applied to workpiece.
Performance
decreases over time.
Excessive noise
or rattling.
Overheating. 1. Forcing tool to work too fast.
Tool does not
grind, sand or
brush effectively.
2. No power at outlet.
3. Tool’s thermal reset
breaker tripped (if equipped).
4. Internal damage or wear. (Carbon
brushes or switch, for example.)
2. Power being reduced by long or
small diameter extension cord.
Carbon brushes worn or damaged. Have qualified technician replace brushes.
Internal damage or wear. (Carbon brushes or
bearings, for example.)
2. Blocked motor housing vents.
3. Motor being strained by long or
small diameter extension cord.
1. Disc accessory may be loose on Spindle.
2. Disc accessory may be damaged,
worn or wrong type for the material.
Follow all safety precautions whenever diagnosing or servicing
the tool. Disconnect power supply before service.
1. Check that cord is plugged in.
2. Check power at outlet. If outlet is unpowered,
turn off tool and check circuit breaker. If breaker
is tripped, make sure circuit is right capacity
for tool and circuit has no other loads.
3. Turn off tool and allow to cool.
Press reset button on tool.
4. Have technician service tool.
1. Decrease pressure, allow tool to do the work.
2. Eliminate use of extension cord. If an extension
cord is needed, use one with the proper
diameter for its length and load. See Extension
Cords in GROUNDING section.
Have technician service tool.
1. Allow tool to work at its own rate.
2. Wear ANSI-approved safety goggles and NIOSHapproved dust mask/respirator while blowing
dust out of motor using compressed air.
3. Eliminate use of extension cord. If an extension
cord is needed, use one with the proper
diameter for its length and load. See Extension
Cords in GROUNDING section.
1. Be sure disc accessory is of correct
dimension and Flange Arbor Nut is tight.
2. Check condition and type of disc accessory. Use
only proper type of disc accessory in good condition.
Page 7For technical questions, please call 1-888-866-5797.Item 57319
Page 8
PARTS LIST AND DIAGRAM
Parts List
Part Description Qty
1 Release Lever 1
2 Cam 1
3 Cylindrical Pin 1
4 Spring Board 1
5 Screw 3
6 Lever Base 1
7 Ball Bearing 1
8 Front Housing 1
9 Pendulum Fork 1
10 Shaft Cover 1
11 Ball Bearing 1
12 Spindle 1
13 Connector 1
14 Spring 1
15 Washer 1
16 Orientation Sleeve 1
17 Compression Spring 2
18 Clutch Lining 1
19 Retaining Ring 1
20 Revolve Shaft 1
21 Dustproof Cover 1
22 Flange Assembly 1
23 Self Tapping Screw 2
24 Right Cover 1
25 Self Tapping Screw 4
26 Left Cover 1
27 O-Ring 1
Part Description Qty
28 Retaining Ring 1
29 Ball Bearing 1
30 Washer 1
31 Counterweight Piece 1
32 Center Cover 1
33 Washer 1
34 Fan 1
35 Rotor 1
36 Washer 1
37 Ball Bearing 1
38 Control Board 1
48 Light PCB 1
39 Cushion Board 2
40 Cylindrical Pin 1
41 Roller Plate 2 1
42 Rubber Pin 2
43 Left Housing 1
44 Trigger 1
45 Retaining Ring 1
46 Self Tapping Screw 6
47 Right Housing 1
48 Light PCB 1
49 Stator Assembly 1
50 Screw 2
51 Baffle 1
52 Rubber Pin 2
53 Board 1
Page 8 For technical questions, please call 1-888-866-5797. Item 57319
Page 9
Assembly Diagram
Electric Circuit
Page 9For technical questions, please call 1-888-866-5797.Item 57319
Page 10
Record Product’s Serial Number Here:
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.
Page 10 For technical questions, please call 1-888-866-5797. Item 57319
Page 11
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.
Page 11For technical questions, please call 1-888-866-5797.Item 57319
Page 12
Email our technical support at: productsupport@harborfreight.com
Visit our website at: http://www.harborfreight.com
For technical questions, please call 1-888-866-5797
Copyright© 2020 by Harbor Freight Tools®. All rights reserved. No portion of this manual or
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.
26541 Agoura Road • Calabasas, CA 91302 • 1-888-866-5797
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