Bauer 21681-B Assembly instructions

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Owner’s Manual & Safety Instructions
Save This Manual%Keep this manual for the safety warnings and precautions, assembly,
operating, inspection, maintenance and cleaning procedures. Write the product’s serial number in the back
of the manual near the assembly diagram (or month and year of purchase if product has no number). Keep
this manual and the receipt in a safe and dry place for future reference. 21l
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.
Copyright©2021 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.
;*,9%$."#%5,$*(",7%+*2&(*%'#"83%$."#%/(&9'4$1%
<,"7'(*%$&%9&%#&%4,8%(*#'7$%"8%#*("&'#%"8='(>1%
?@!6%ABC?%D@EF@G1

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A,+7*%&2%T&8$*8$#
Safety ............................................................ 2
Specifications ................................................ 9
Setup ............................................................. 9
Operation...................................................... 10
Maintenance................................................. 13
Parts List and Diagram................................. 15
Warranty ....................................................... 16
U@;ECEV%?QDWRG?%@EX%X6<CECACRE?
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.
CDSR;A@EA%?@<6AQ%CE<R;D@ACRE
V*8*(,7%S&)*(%A&&7%?,2*$>%U,(8"83#
;*,9%,77%#,2*$>%),(8"83#%,89%"8#$('4$"&8#1%%
Failure to follow the warnings and instructions may result in electric shock, fire and/or serious injury.
?,Y*%,77%),(8"83#%,89%"8#$('4$"&8#%2&(%2'$'(*%(*2*(*84*1%

U&(Z%@(*,%?,2*$>
1. [**/%)&(Z%,(*,%47*,8%,89%)*77%7"$1%%
Cluttered or dark areas invite accidents.
2. X&%8&$%&/*(,$*%/&)*(%$&&7#%"8%
*\/7&#"Y*%,$5&#/.*(*#I%#'4.%,#%"8%$.*%
/(*#*84*%&2%27,55,+7*%7"H'"9#I%3,#*#%
&(%9'#$1%%
which may ignite the dust or fumes.
3. [**/%4."79(*8%,89%+>#$,89*(#%
,),>%)."7*%&/*(,$"83%,%/&)*(%$&&71%%
Distractions can cause you to lose control.
67*4$("4,7%?,2*$>
X&%8&$%*\/&#*%/&)*(%$&&7#%$&%(,"8%&(%)*$%4&89"$"&8#1


Page 3<&(%$*4.8"4,7%H'*#$"&8#I%/7*,#*%4,77%JKLLLKLMMKNOPO1Item 58162
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S*(#&8,7%?,2*$>
1. ?$,>%,7*($I%),$4.%).,$%>&'%,(*%9&"83%,89%
'#*%4&55&8%#*8#*%).*8%&/*(,$"83%,%
/&)*(%$&&71%%X&%8&$%'#*%,%/&)*(%$&&7%)."7*%
>&'%,(*%$"(*9%&(%'89*(%$.*%"827'*84*%&2%
9('3#I%,74&.&7%&(%5*9"4,$"&81 A moment


2. F#*%#,2*$>%*H'"/5*8$1%%@7),>#%)*,(%*>*%
/(&$*4$"&81
dust mask, non-skid safety shoes, hard hat,


3. S(*Y*8$%'8"8$*8$"&8,7%#$,($"831%68#'(*%
$.*%#)"$4.0$("33*(%"#%"8%$.*%&22K/&#"$"&8%
+*2&(*%/"4Z"83%'/%&(%4,((>"83%$.*%$&&71


have the switch on invites accidents.
4. ;*5&Y*%,8>%,9='#$"83%Z*>%&(%)(*84.%
+*2&(*%$'(8"83%$.*%/&)*(%$&&7%&81%%%
A wrench or a key left attached to


5. X&%8&$%&Y*((*,4.1%%[**/%/(&/*(%
2&&$"83%,89%+,7,84*%,$%,77%$"5*#1 This


6. X(*##%/(&/*(7>1%%X&%8&$%)*,(%7&&#*%
47&$."83%&(%=*)*7(>1%%[**/%>&'(%.,"(I%
47&$."83%,89%37&Y*#%,),>%2(&5%5&Y"83%
/,($#1 Loose clothes, jewelry or long

7. C2%9*Y"4*#%,(*%/(&Y"9*9%2&(%$.*%4&88*4$"&8%
&2%9'#$%*\$(,4$"&8%,89%4&77*4$"&8%
2,4"7"$"*#I%*8#'(*%$.*#*%,(*%4&88*4$*9%
,89%/(&/*(7>%'#*91%%Use of these devices
can reduce dust-related hazards.
8. 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.
S&)*(%A&&7%F#*%,89%T,(*
1. X&%8&$%2&(4*%$.*%/&)*(%$&&71%%%
F#*%$.*%4&((*4$%/&)*(%$&&7%2&(%>&'(%
,//7"4,$"&81
will do the job better and safer at the
rate for which it was designed.
2. X&%8&$%'#*%$.*%/&)*(%$&&7%"2%$.*%#)"$4.0
$("33*(%9&*#%8&$%$'(8%"$%&8%,89%&221%%%

controlled with the switch/trigger is

3. A'(8%&22%$.*%#)"$4.%2(&5%$.*%/&)*(%$&&7%
+*2&(*%5,Z"83%,8>%,9='#$5*8$#I%4.,83"83%
,44*##&("*#I%&(%#$&("83%/&)*(%$&&7#1%%


4. ?$&(*%"97*%/&)*(%$&&7#%&'$%&2%$.*%
(*,4.%&2%4."79(*8%,89%9&%8&$%,77&)%
/*(#&8#%'82,5"7",(%)"$.%$.*%/&)*(%$&&7%
&(%$.*#*%"8#$('4$"&8#%$&%&/*(,$*%$.*%
/&)*(%$&&71%%Power tools are dangerous
in the hands of untrained users.
5. D,"8$,"8%/&)*(%$&&7#1%%T.*4Z%2&(%
5"#,7"385*8$%&(%+"89"83%&2%5&Y"83%
/,($#I%+(*,Z,3*%&2%/,($#%,89%,8>%&$.*(%
4&89"$"&8%$.,$%5,>%,22*4$%$.*%/&)*(%$&&7]#%
&/*(,$"&81%%C2%9,5,3*9I%.,Y*%$.*%/&)*(%
$&&7%(*/,"(*9%+*2&(*%'#*1 Many accidents

6. [**/%4'$$"83%$&&7#%#.,(/%,89%47*,81%%%


to bind and are easier to control.
7. F#*%$.*%/&)*(%$&&7I%,44*##&("*#%,89%
$&&7%+"$#%*$41%"8%,44&(9,84*%)"$.%$.*#*%
"8#$('4$"&8#I%$,Z"83%"8$&%,44&'8$%$.*%
)&(Z"83%4&89"$"&8#%,89%$.*%)&(Z%$&%
+*%/*(2&(5*91

could result in a hazardous situation.

Page 4 <&(%$*4.8"4,7%H'*#$"&8#I%/7*,#*%4,77%JKLLLKLMMKNOPO1 Item 58162
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?*(Y"4*
B,Y*%>&'(%/&)*(%$&&7%#*(Y"4*9%+>%,%H',7"2"*9%(*/,"(%/*(#&8%'#"83%&87>%"9*8$"4,7%(*/7,4*5*8$%
/,($#1%%%

?,2*$>%U,(8"83#%T&55&8%2&(%V("89"83I%?,89"83I%
S&7"#."83I%&(%@+(,#"Y*%T'$$"83K&22%R/*(,$"&8#
1. A."#%/&)*(%$&&7%"#%"8$*89*9%$&%2'84$"&8%,#%
,%3("89*(I%#,89*(I%/&7"#.*(I%&(%4'$K&22%$&&71
Read all safety warnings, instructions,


instructions listed below may result in
electric shock, fire and/or serious injury.
2. X&%8&$%'#*%,44*##&("*#%)."4.%,(*%8&$%
#/*4"2"4,77>%9*#"38*9%,89%(*4&55*89*9%
+>%$.*%$&&7%5,8'2,4$'(*(1%Just because
the accessory can be attached to your

3. A.*%;@A6X%?S66X%&2%$.*%,44*##&("*#%
5'#$%+*%,$%7*,#$%*H',7%$&%$.*%&/*(,$"83%
#/**9%#*$$"83%5,(Z*9%&8%$.*%/&)*(%$&&71%
Accessories running faster than their

4. A.*%&'$#"9*%9",5*$*(%,89%$.*%$."4Z8*##%
&2%>&'(%,44*##&(>%5'#$%+*%)"$."8%
$.*%4,/,4"$>%(,$"83%&2%>&'(%/&)*(%
$&&71%Incorrectly sized accessories
cannot be adequately controlled.
5. A.*%,(+&'(%#"^*%&2%).**7#I%#,89"83%
9('5#%&(%,8>%&$.*(%,44*##&(>%5'#$%
/(&/*(7>%2"$%$.*%#/"897*%&(%4&77*$%&2%
$.*%/&)*(%$&&71%Accessories that do
not match the mounting hardware of the

excessively and may cause loss of control.
6. D,89(*7%DRFEA6X%UB66G?I%#,89"83%
9('5#I%4'$$*(#%&(%&$.*(%,44*##&("*#%
5'#$%+*%2'77>%"8#*($*9%"8$&%$.*%4&77*$%&(%
4.'4Z1%If the mandrel is insufficiently held
and/or the overhang of the wheel is too
long, the MOUNTED WHEEL may become
loose and be ejected at high velocity.
7. X&%8&$%'#*%,%9,5,3*9%,44*##&(>1%Before


sanding drum for cracks, tear or excess
wear, wire brush for loose or cracked wires.








8. U*,(%/*(#&8,7%/(&$*4$"Y*%*H'"/5*8$1%

shield, safety goggles or safety glasses.









intensity noise may cause hearing loss.
9. [**/%+>#$,89*(#%,%#,2*%9"#$,84*%,),>%
2(&5%)&(Z%,(*,1%Anyone entering the

%
broken accessory may fly away and cause

10. B&79%/&)*(%$&&7%+>%"8#'7,$*9%3("//"83%
#'(2,4*#%&87>I%).*8%/*(2&(5"83%,8%
&/*(,$"&8%).*(*%$.*%4'$$"83%,44*##&(>%
5,>%4&8$,4$%."99*8%)"("83%&(%"$#%&)8%
4&(91%Cutting accessory contacting a



11. @7),>#%.&79%$.*%$&&7%2"(57>%"8%>&'(%
.,89_#`%9'("83%$.*%#$,($K'/1%The reaction
torque of the motor, as it accelerates to


Page 5<&(%$*4.8"4,7%H'*#$"&8#I%/7*,#*%4,77%JKLLLKLMMKNOPO1Item 58162
?@<6AQRS6;@ACRED@CEA6E@ET6 ?6AFS
12. F#*%47,5/#%$&%#'//&($%)&(Z/"*4*%
).*8*Y*(%/(,4$"4,71%Never hold a small



to control the tool. Round material such

tendency to roll while being cut, and may

13. E*Y*(%7,>%$.*%/&)*(%$&&7%9&)8%'8$"7%$.*%
,44*##&(>%.,#%4&5*%$&%,%4&5/7*$*%#$&/1%


14. @2$*(%4.,83"83%$.*%+"$#%&(%5,Z"83%,8>%
,9='#$5*8$#I%5,Z*%#'(*%$.*%4&77*$%
8'$I%4.'4Z%&(%,8>%&$.*(%,9='#$5*8$%
9*Y"4*#%,(*%#*4'(*7>%$"3.$*8*91%Loose

shift, causing loss of control, loose rotating

15. X&%8&$%('8%$.*%/&)*(%$&&7%)."7*%4,((>"83%
"$%,$%>&'(%#"9*1%Accidental contact with the


16. ;*3'7,(7>%47*,8%$.*%/&)*(%$&&7]#%,"(%
Y*8$#1%The motor’s fan will draw the
dust inside the housing and excessive

may cause electrical hazards.
17. X&%8&$%&/*(,$*%$.*%/&)*(%$&&7%
8*,(%27,55,+7*%5,$*(",7#1%
could ignite these materials.
18. X&%8&$%'#*%,44*##&("*#%$.,$%(*H'"(*%
7"H'"9%4&&7,8$#1%Using water or other liquid
coolants may result in electrocution or shock.
19. Maintain labels and nameplates on the tool.
These carry important safety information.
If unreadable or missing, contact
Harbor Freight Tools for a replacement.
20. Avoid unintentional starting.
Prepare to begin work before
turning on the tool.
21. Do not depress the spindle lock when
starting or during operation.
22. Do not leave the tool unattended when the
switch is on. Turn off the tool, before leaving.
23. Use clamps (not included) or other practical
ways to secure and support the workpiece to
a stable platform. Holding the work by hand
or against your body is unstable and may
lead to loss of control and personal injury.
24. Contains Li-Ion battery. Battery must be
recycled or disposed of properly. Do not
open, crush, heat above 140° F or incinerate.
25. This product is not a toy.
Keep it out of reach of children.
26. 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. In addition, people with
pacemakers should:
• Avoid operating alone.
• Do not use with power switch locked on.
• Properly maintain and inspect
to avoid electrical shock.
• Properly ground power cord. Ground
Fault Circuit Interrupter (GFCI) should
also be implemented – it prevents
sustained electrical shock.
27. 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.

Page 6 <&(%$*4.8"4,7%H'*#$"&8#I%/7*,#*%4,77%JKLLLKLMMKNOPO1 Item 58162
?@<6AQ RS6;@ACRE D@CEA6E@ET6?6AFS
["4Z+,4Z%,89%;*7,$*9%U,(8"83#
Kickback is a sudden reaction to a pinched or
snagged rotating wheel, backing pad, brush
or any other accessory. Pinching or snagging
causes rapid stalling of the rotating accessory
which in turn causes the uncontrolled power
tool to be forced in the direction opposite of the
accessory’s rotation at the point of the binding.
For example, if an abrasive wheel is snagged
or pinched by the workpiece, the edge of the
wheel that is entering into the pinch point can
dig into the surface of the material causing the
wheel to climb out or kick out. The wheel may
either jump toward or away from the operator,
depending on direction of the wheel’s movement
at the point of pinching. Abrasive wheels
may also break under these conditions.
Kickback is the result of power tool misuse
and/or incorrect operating procedures or
conditions and can be avoided by taking
proper precautions as given below.
1. D,"8$,"8%,%2"(5%3("/%&8%$.*%/&)*(%$&&7%
,89%/&#"$"&8%>&'(%+&9>%,89%,(5%$&%
,77&)%>&'%$&%(*#"#$%Z"4Z+,4Z%2&(4*#1%


2. F#*%#/*4",7%4,(*%).*8%)&(Z"83%4&(8*(#I%
#.,(/%*93*#%*$41%Avoid bouncing and

edges or bouncing have a tendency
to snag the rotating accessory and
cause loss of control or kickback.
3. X&%8&$%,$$,4.%,%$&&$.*9%#,)%
+7,9*1%Such blades create frequent
kickback and loss of control.
4. @7),>#%2**9%$.*%+"$%"8$&%$.*%5,$*(",7%"8%
$.*%#,5*%9"(*4$"&8%,#%$.*%4'$$"83%*93*%
"#%*\"$"83%2(&5%$.*%5,$*(",7%_)."4.%"#%
$.*%#,5*%9"(*4$"&8%,#%$.*%4."/#%,(*%
$.(&)8`1%Feeding the tool in the wrong
direction causes the cutting edge of

the tool in the direction of this feed.
5. U.*8%'#"83%(&$,(>%2"7*#I%4'$K&22%).**7#I%
."3.K#/**9%4'$$*(#%&(%$'83#$*8%4,(+"9*%
4'$$*(#I%,7),>#%.,Y*%$.*%)&(Z%#*4'(*7>%
47,5/*91%These wheels will grab if they
become slightly canted in the groove, and
can kickback. When a cut-off wheel grabs,
the wheel itself usually breaks. When a rotary


and you could lose control of the tool.
?,2*$>%U,(8"83#%?/*4"2"4%2&(%?,89"83%R/*(,$"&8#
X&%8&$%'#*%*\4*##"Y*7>%&Y*(#"^*9%#,89"83%9"#4%/,/*(1%<&77&)%5,8'2,4$'(*(]#%
(*4&55*89,$"&8#%).*8%#*7*4$"83%#,89"83%/,/*(1

?,2*$>%U,(8"83#%?/*4"2"4%<&(%@+(,#"Y*%T'$$"83KR22%R/*(,$"&8#
1. F#*%&87>%).**7%$>/*#%$.,$%,(*%
(*4&55*89*9%2&(%>&'(%/&)*(%$&&7%,89%
&87>%2&(%(*4&55*89*9%,//7"4,$"&8#1%

side of a cut-off wheel. Abrasive cut-


wheels may cause them to shatter.
2. <&(%$.(*,9*9%,+(,#"Y*%4&8*#%,89%/7'3#%
'#*%&87>%'89,5,3*9%).**7%5,89(*7#%)"$.%
,8%'8(*7"*Y*9%#.&'79*(%27,83*%$.,$%,(*%&2%
4&((*4$%#"^*%,89%7*83$.1%

3. X&%8&$%a=,5b%,%4'$K&22%).**7%&(%,//7>%
*\4*##"Y*%/(*##'(*1%

Overstressing the wheel increases the

snagging of the wheel in the cut and the

4. X&%8&$%/&#"$"&8%>&'(%.,89%"8%7"8*%)"$.%
,89%+*."89%$.*%(&$,$"83%).**71%When





Page 7<&(%$*4.8"4,7%H'*#$"&8#I%/7*,#*%4,77%JKLLLKLMMKNOPO1Item 58162
?@<6AQRS6;@ACRED@CEA6E@ET6 ?6AFS
?,2*$>%U,(8"83#%?/*4"2"4%<&(%U"(*%W('#."83%R/*(,$"&8#
1. W*%,),(*%$.,$%)"(*%+("#$7*#%,(*%$.(&)8%+>%
$.*%+('#.%*Y*8%9'("83%&(9"8,(>%&/*(,$"&81%

excessive load to the brush. The wire bristles

2. @77&)%+('#.*#%$&%('8%,$%&/*(,$"83%#/**9%
2&(%,$%7*,#$%&8*%5"8'$*%+*2&(*%'#"83%$.*51%%
During this time no one is to stand in front or
in line with the brush. Loose bristles or wires
will be discharged during the run-in time.
3. X"(*4$%$.*%9"#4.,(3*%&2%$.*%#/"88"83%)"(*%
+('#.%,),>%2(&5%>&'1%
tiny wire fragments may be discharged at
high velocity during the use of these brushes
and may become imbedded in your skin.
!"+(,$"&8%?,2*$>
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.
%?@!6%AB6?6%CE?A;FTACRE?1

Page 8 <&(%$*4.8"4,7%H'*#$"&8#I%/7*,#*%4,77%JKLLLKLMMKNOPO1 Item 58162
?@<6AQ RS6;@ACRE D@CEA6E@ET6?6AFS
V(&'89"83
% AR%S;6!6EA%6G6TA;CT%?BRT[%@EX%X6@AB%<;RD%CETR;;6TA%V;RFEXCEV-%
T.*4Z%)"$.%,%H',7"2"*9%*7*4$("4",8%"2%>&'%,(*%"8%9&'+$%,#%$&%).*$.*(%$.*%&'$7*$%"#%%%
/(&/*(7>%3(&'89*91%%X&%8&$%5&9"2>%$.*%/&)*(%4&(9%/7'3%/(&Y"9*9%)"$.%$.*%%%
4.,(3*(1%E*Y*(%(*5&Y*%$.*%3(&'89"83%/(&83%2(&5%$.*%/7'31%%X&%8&$%'#*%$.*%
4.,(3*(%"2%$.*%/&)*(%4&(9%&(%/7'3%"#%9,5,3*91%%C2%9,5,3*9I%.,Y*%"$%(*/,"(*9%+>%,%#*(Y"4*%
2,4"7"$>%+*2&(*%'#*1%%C2%$.*%/7'3%)"77%8&$%2"$%$.*%&'$7*$I%.,Y*%,%/(&/*(%&'$7*$%"8#$,77*9%+>%,%
H',7"2"*9%*7*4$("4",81
6\$*8#"&8%T&(9#
E&$*- Extension cords must not be used with this item’s Charger.
?>5+&7&3>
!@TVolts Alternating Current
@Amperes
8c%\\\\05"81 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 Fire.
Do not cover ventilation ducts.
Charge on fireproof surface only.
WARNING marking concerning
Risk of Electric Shock.
Properly connect Charger’s power
cord to appropriate outlet.

Page 9<&(%$*4.8"4,7%H'*#$"&8#I%/7*,#*%4,77%JKLLLKLMMKNOPO1Item 58162
?@<6AQRS6;@ACRED@CEA6E@ET6 ?6AFS
%?/*4"2"4,$"&8#
Battery 8V Li-ion 2000mAh
Charging Time 2 to 3 hours
Charger Input 120VAC, 0.6A
Charger Output 9.0VDC, 1.0A
No Load Speed n0: 5000 - 30,000/min
Collet Size 1/8″(Ø35mm)
%?*$'/%K%W*2&(*%F#*-
% ;*,9%$.*%6EAC;6 CDSR;A@EA%?@<6AQ%CE<R;D@ACRE%#*4$"&8%
,$%$.*%+*3"88"83%&2%$."#%5,8',7%"847'9"83%,77%$*\$%'89*(%
#'+.*,9"83#%$.*(*"8%+*2&(*%#*$%'/%&(%'#*%&2%$."#%/(&9'4$1
%AR%S;6!6EA%?6;CRF?%CEdF;Q%<;RD%@TTCX6EA@G%RS6;@ACRE-
D,Z*%#'(*%$.,$%$.*%S&)*(%?)"$4.%"#%"8%$.*%&22K/&#"$"&8%,89%'8/7'3%$.*%$&&7%2(&5%
"$]#%*7*4$("4,7%&'$7*$%+*2&(*%/*(2&(5"83%,8>%/(&4*9'(*%"8%$."#%#*4$"&81
E&$*- For additional information regarding the parts listed in the following
pages refer to the Assembly Diagram near the end of this manual.
<'84$"&8#
S&)*(%?)"$4.
?/"897*%G&4Z
B&'#"83%T,/
T&77*$%E'$
?/**9%W'$$&8#
?/**9%C89"4,$&(
W,$$*(>%C89"4,$&(

Page 10 <&(%$*4.8"4,7%H'*#$"&8#I%/7*,#*%4,77%JKLLLKLMMKNOPO1 Item 58162
?@<6AQ RS6;@ACRE D@CEA6E@ET6?6AFS
R/*(,$"83%C8#$('4$"&8#
% ;*,9%$.*%6EAC;6%CDSR;A@EA%?@<6AQ%CE<R;D@ACRE%#*4$"&8%
,$%$.*%+*3"88"83%&2%$."#%5,8',7%"847'9"83%,77%$*\$%'89*(%
#'+.*,9"83#%$.*(*"8%+*2&(*%#*$%'/%&(%'#*%&2%$."#%/(&9'4$1
A&&7%?*$%F/
AR%S;6!6EA%?6;CRF?%CEdF;Q%<;RD%@TTCX6EA@G%RS6;@ACRE-%
A'(8%$.*%S&)*(%?)"$4.%&2%$.*%$&&7%&22I%),"$%2&(%$.*%5&$&(%$&%#$&/I%
+*2&(*%,9='#$"83%$&&7%&(%"8#$,77"83%,44*##&("*#1
AR%S;6!6EA%?6;CRF?%CEdF;Q%<;RD%@TT6??R;Q%<@CGF;6-%
R87>%'#*%,44*##&("*#%$.,$%,(*%(,$*9%,$%&(%,+&Y*%$.*%;SD%(,$"83%&2%$.*%T&(97*##%;&$,(>%A&&71
T.,(3"83
ERA6- Before using tool for the first
time, fully charge the Battery.
1. Use only included Charger. Use of
other chargers may cause battery
failure including explosion.
2. Plug charger’s jack into charging port.
T.,(3"83%
S&($
W,$$*(>%
C89"4,$&(
3. Plug Adaptor into a grounded 120VAC outlet.
4. During recharging, the tool will become
slightly warm to the touch. This is normal
and not a cause for concern.
5. Battery indicator shows charging when
LEDs flash. When charging is done lights
will stay on. Unplug charging cable.
ERACT6- Do not leave the Battery in a
discharged state. Charge the Battery every 3
months if the tool is not in use. This will keep the
Battery from wearing down and add to its life. Do
not charge the tool at temperatures below 40° F.

Page 11<&(%$*4.8"4,7%H'*#$"&8#I%/7*,#*%4,77%JKLLLKLMMKNOPO1Item 58162
?@<6AQRS6;@ACRED@CEA6E@ET6 ?6AFS
C8#*($"83%,%W"$
T&77*$%E'$
?/"897*%G&4Z
T@FACREe When changing a bit immediately
after use, be careful not to touch the bit. It may
be very hot from use, possibly causing injury.
Allow the bit time to cool before handling it.
1. Depress the Spindle Lock.
Rotate collet until shaft is
engaged by the lock.
2. Loosen the Collet Nut by turning
it counterclockwise, using
the Wrench provided.
3. To remove a bit: Pull the bit straight out
of the Collet once the Collet Nut is loose.
To insert a bit: Insert the shank end of the
bit into the Collet once the Collet Nut is loose.
ERA6- Do not force a wrong sized bit into the
collet, and do not modify a mismatched collet or
bit. ?*Y*(*%/*(#&8,7%&(%/(&/*($>%9,5,3*%5,>%
(*#'7$%2(&5%'#"83%5"#5,$4.*9%4&77*$#%&(%+"$#1
4. Tighten Collet Nut securely using the
provided wrench. Ensure that the spindle
lock is released before turning on the tool.
C8#$,77"83%?."*79
The housing cap is interchangeable
with the shield attachment.
1. Remove the housing cap by
turning counterclockwise.
B&'#"83%T,/%
2. Install the shield attachment by
turning lock nut clockwise. Reposition
Shield by turning it left or right.
G&4Z%E'$
?."*79
E&$*- When installing or removing, use only
hand pressure and tighten firmly by hand.
Do not overtighten, as this may damage the part.
U&(Z/"*4*%,89%U&(Z%@(*,%?*$%F/
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 objects,
such as utility lines, nearby that will
present a hazard while working.

Page 12 <&(%$*4.8"4,7%H'*#$"&8#I%/7*,#*%4,77%JKLLLKLMMKNOPO1 Item 58162
?@<6AQ RS6;@ACRE D@CEA6E@ET6?6AFS
V*8*(,7%R/*(,$"83%C8#$('4$"&8#
AR%S;6!6EA%?6;CRF?%CEdF;Q%UBCG6%CE%RS6;@ACRE-%
F#*%/*(#&8,7%/(&$*4$"Y*%*H'"/5*8$1%%@7),>#%)*,(%*>*%/(&$*4$"&81%
U*,(%@E?CK,//(&Y*9%#,2*$>%3&337*#%)"$.%#"9*%#."*79#1%%
1. Charge the tool before use.
2. Select an appropriate bit or attachment
for the job. Insert the bit or attachment.
3. Start the tool by pushing the
Power Switch to ON position.
4. Use the speed buttons to increase
or decrease speed. Use a speed
appropriate to the bit and the material
being worked on. In general, harder
materials require faster speeds and
softer materials require slower speeds.
S&)*(%?)"$4.%
?/**9%W'$$&8#
5. Apply the bit to the work material as needed.
6. When task is complete, stop the tool
by pushing power switch to the OFF
position. Wait for tool to completely stop
spinning. Remove the bit or attachment.
7. Store tool, parts and accessories inside case
to protect from moisture and humidity. Store
in an indoor dry area out of reach of children.

Page 13<&(%$*4.8"4,7%H'*#$"&8#I%/7*,#*%4,77%JKLLLKLMMKNOPO1Item 58162
?@<6AQRS6;@ACRED@CEA6E@ET6 ?6AFS
D,"8$*8,84*%,89%?*(Y"4"83
%S(&4*9'(*#%8&$%#/*4"2"4,77>%*\/7,"8*9%"8%$."#%5,8',7%5'#$%
+*%/*(2&(5*9%&87>%+>%,%H',7"2"*9%$*4.8"4",81
AR%S;6!6EA%?6;CRF?%CEdF;Q%<;RD%@TTCX6EA@G%RS6;@ACRE-%
A'(8%$.*%S&)*(%?)"$4.%&22%,89%),"$%2&(%$&&7%$&%4&5/7*$*7>%#$&/%+*2&(*%
/*(2&(5"83%,8>%"8#/*4$"&8I%5,"8$*8,84*I%&(%47*,8"83%/(&4*9'(*#1
AR%S;6!6EA%?6;CRF?%CEdF;Q%<;RD%ARRG%<@CGF;6-%
X&%8&$%'#*%9,5,3*9%*H'"/5*8$1%%C2%,+8&(5,7%8&"#*%&(%Y"+(,$"&8%
&44'(#I%.,Y*%$.*%/(&+7*5%4&((*4$*9%+*2&(*%2'($.*(%'#*1
T7*,8"83I%D,"8$*8,84*I%,89%G'+("4,$"&8
1. W6<R;6%6@TB%F?6I inspect the general
condition of the tool. Check for:
• 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. @<A6;%F?6I wipe external surfaces
of the tool with clean cloth.
3. Store tool, parts and accessories inside case
to protect from moisture and humidity. Store
in an indoor dry area out of reach of children.
W,$$*(>%;*5&Y,7%C8#$('4$"&8#
Contains Li-Ion battery. BATTERY MUST BE
RECYCLED OR DISPOSED OF PROPERLY.
1. Remove screws from housing.
W,$$*(>T"(4'"$%W&,(9
2. Remove circuit board and battery.
3. Disconnect battery wires from ciruit board.
W,$$*(>%U"(*%
W,$$*(>%U"(*#%
4. Recycle or dispose of battery properly.

Page 14 <&(%$*4.8"4,7%H'*#$"&8#I%/7*,#*%4,77%JKLLLKLMMKNOPO1 Item 58162
?@<6AQ RS6;@ACRE D@CEA6E@ET6?6AFS
A(&'+7*#.&&$"83
S(&+7*5 S&##"+7*%T,'#*# G"Z*7>%?&7'$"&8#
Tool will not start. 1. Battery discharged.
2. Internal damage or wear.
(Carbon brushes or
switch, for example.)
1. Charge Battery.
2. Have technician service tool.
Performance
decreases
over time.
1. Accessory dull
or damaged.
2. Carbon brushes
worn or damaged.
1. Keep cutting accessories
sharp. Replace as needed.
2. Have qualified technician replace brushes.
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. Accessory dull
or damaged.
3. Blocked motor
housing vents.
1. Allow tool to work at its own rate.
2. Keep cutting accessories
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.
% <&77&)%,77%#,2*$>%/(*4,'$"&8#%).*8*Y*(%9",38&#"83%&(%#*(Y"4"83%$.*%$&&71%%
X"#4&88*4$%/&)*(%#'//7>%+*2&(*%#*(Y"4*1
SG6@?6%;6@X%AB6%<RGGRUCEV%T@;6<FGGQ
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.

Page 15<&(%$*4.8"4,7%H'*#$"&8#I%/7*,#*%4,77%JKLLLKLMMKNOPO1Item 58162
?@<6AQRS6;@ACRED@CEA6E@ET6 ?6AFS
S,($ X*#4("/$"&8 f$>
1 Collet Nut 1
2 Collet 1
3 Housing Cap 1
4 Axle 1
5 Bearing 1
6 Spindle Lock 1
7 Power Switch 1
8-1 Panel 1
8-2 PCB Board 1
8-3 Battery Indicator 1
8-4 Speed Button 1
S,($ X*#4("/$"&8 f$>
8-5 Speed Light Guide 1
8-6 PCB Board Screw 2
8-7 Battery Components 1
9 Motor Case Parts 1
10 Ring 1
11 End Cap 1
12 Motor DC7.2 1
13 Electrode Bracket 1
14 Electrode Rubber Pad 2
15 Motor Screw 2
16 Motor Case Screw 6
S,($#%G"#$%,89%X",3(,5
;*4&(9%S(&9'4$]#%?*(",7%E'5+*(%B*(*-%
E&$*- If product has no serial number, record month and year of purchase instead.
E&$*- Some parts are listed and shown for illustration purposes only, and are not available
individually as replacement parts. Specify UPC 193175433220 when ordering parts.

G"5"$*9%Pc%X,>%U,((,8$>
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.
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