Harbor Freight Tools Bauer 21505C-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. 21b
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© 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.
To ols required for assembly and se rv ic e m ay n ot b e i nc lu de d .
Read this material before using this product.
Failure to do so can result in serious injury.
SAVE THIS MANUAL.

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Safety .................................................2
Specifications .....................................7
Setup ..................................................7
Operation ............................................8
Maintenance ......................................10
Parts List and Diagram ......................11
Warranty ............................................12
XB=UTUY%FQV<RZF%BU[%[6;TUTPTRUF
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.
TVSR=PBUP%FB;6PQ%TU;R=VBPTRU
Y*8*(,7%S&)*(%P&&7%F,2*$D%X,(8"83#
=*,9%,77%#,2*$D%),(8"83#%,89%,77%"8#$('4$"&8#1%%
Failure to follow the warnings and instructions may result in electric shock, fire and/or serious injury.
F,\*%,77%),(8"83#%,89%"8#$('4$"&8#%2&(%2'$'(*%(*2*(*84*1%
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X&(]%B(*,%F,2*$D
1. ^**/%)&(]%,(*,%47*,8%,89%)*77%7"$1%%
Cluttered or dark areas invite accidents.
2. [&%8&$%&/*(,$*%/&)*(%$&&7#%"8%*_/7&#"\*%
,$5&#/.*(*#>%#'4.%,#%"8%$.*%/(*#*84*%&2%
27,55,+7*%7"H'"9#>%3,#*#%&(%9'#$1
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may ignite the dust or fumes.
3. ^**/%4."79(*8%,89%+D#$,89*(#%
,),D%)."7*%&/*(,$"83%,%/&)*(%$&&71
Distractions can cause you to lose control.

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S*(#&8,7%F,2*$D
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9&"83%,89%'#*%4&55&8%#*8#*%).*8%
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,%/&)*(%$&&7%)."7*%D&'%,(*%$"(*9%&(%
'89*(%$.*%"827'*84*%&2%9('3#>%,74&.&7%
&(%5*9"4,$"&81 A moment of inattention
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2. ?#*%/*(#&8,7%/(&$*4$"\*%*H'"/5*8$1%%
B7),D#%)*,(%*D*%/(&$*4$"&81
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non-skid safety shoes, hard hat, or
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
3. S(*\*8$%'8"8$*8$"&8,7%#$,($"831%
68#'(*%$.*%S&)*(%F)"$4.%"#%"8%$.*%
&22J/&#"$"&8%+*2&(*%4&88*4$"83%
$&%/&)*(%#&'(4*>%/"4]"83%'/%&(%
4,((D"83%$.*%$&&71
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
have the Power Switch on invites accidents.
4. [&%8&$%&\*((*,4.1%%^**/%/(&/*(%
2&&$"83%,89%+,7,84*%,$%,77%$"5*#1
This enables better control of the
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5. R87D%'#*%#,2*$D%*H'"/5*8$%
$.,$%.,#%+**8%,//(&\*9%+D%,8%
,//(&/(",$*%#$,89,(9#%,3*84D1
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
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hazards in the work area.
S&)*(%P&&7%?#*%,89%W,(*
1. [&%8&$%2&(4*%$.*%/&)*(%$&&71%%?#*%
$.*%4&((*4$%/&)*(%$&&7%2&(%D&'(%
,//7"4,$"&81
will do the job better and safer at the
rate for which it was designed.
2. [&%8&$%'#*%$.*%/&)*(%$&&7%"2%$.*%
S&)*(%F)"$4.%9&*#%8&$%$'(8%"$%&8%
,89%&221 
be controlled with the Power Switch is
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3. ["#4&88*4$%$.*%+,$$*(D%/,4]%2(&5%
$.*%/&)*(%$&&7%+*2&(*%5,]"83%,8D%
,9`'#$5*8$#>%4.,83"83%,44*##&("*#>%&(%
#$&("83%/&)*(%$&&7#1 
safety measures reduce the risk of

4. F$&(*%"97*%/&)*(%$&&7#%&'$%&2%$.*%
(*,4.%&2%4."79(*8%,89%9&%8&$%,77&)%
/*(#&8#%'82,5"7",(%)"$.%$.*%/&)*(%$&&7%
&(%$.*#*%"8#$('4$"&8#%$&%&/*(,$*%$.*%
/&)*(%$&&71 Power tools are dangerous
in the hands of untrained users.
5. V,"8$,"8%/&)*(%$&&7#1%%W.*4]%2&(%
5"#,7"385*8$%&(%+"89"83%&2%5&\"83%
/,($#>%+(*,],3*%&2%/,($#%,89%,8D%&$.*(%
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&/*(,$"&81%%T2%9,5,3*9>%.,\*%$.*%/&)*(%
$&&7%(*/,"(*9%+*2&(*%'#*1 Many accidents
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6. ?#*%$.*%/&)*(%$&&7>%,44*##&("*#%,89%
$&&7%+"$#%*$41%"8%,44&(9,84*%)"$.%$.*#*%
"8#$('4$"&8#>%$,]"83%"8$&%,44&'8$%$.*%
)&(]"83%4&89"$"&8#%,89%$.*%)&(]%$&%
+*%/*(2&(5*91

could result in a hazardous situation.

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1. =*4.,(3*%&87D%)"$.%$.*%4.,(3*(%
#/*4"2"*9%+D%$.*%5,8'2,4$'(*(1



2. ?#*%/&)*(%$&&7#%&87D%)"$.%
#/*4"2"4,77D%9*#"38,$*9%+,$$*(D%/,4]#1

create a risk of injury and fire.
3. X.*8%+,$$*(D%/,4]%"#%8&$%"8%'#*>%]**/%
"$%,),D%2(&5%&$.*(%5*$,7%&+`*4$#>%7"]*%
/,/*(%47"/#>%4&"8#>%]*D#>%8,"7#>%#4(*)#%
&(%&$.*(%#5,77%5*$,7%&+`*4$#>%$.,$%4,8%
5,]*%,%4&88*4$"&8%2(&5%&8*%$*(5"8,7%
$&%,8&$.*(1%Shorting the battery terminals
together may cause burns or a fire.
4. ?89*(%,+'#"\*%4&89"$"&8#>%7"H'"9%5,D%+*%
*`*4$*9%2(&5%$.*%+,$$*(Db%,\&"9%4&8$,4$1%
T2%4&8$,4$%,44"9*8$,77D%&44'(#>%
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,99"$"&8,77D%#**]%5*9"4,7%.*7/1%
Liquid ejected from the battery
may cause irritation or burns.
F*(\"4*
C,\*%D&'(%/&)*(%$&&7%#*(\"4*9%+D%,%H',7"2"*9%(*/,"(%/*(#&8%'#"83%&87D%"9*8$"4,7%
(*/7,4*5*8$%/,($#1% 
Y7'*%Y'8%F,2*$D%X,(8"83#
1. When working with plastics, varnish, or
similar materials, gases develop that are
easily flammable and can lead to explosions.
Be prepared for flames to develop and keep
suitable fire extinguishing means at hand.
2. The Nozzle becomes very hot. Do not
lay the Glue Gun on flammable surfaces
when operating the Gun or immediately
after turning the Gun off. Always set the
Glue Gun on a flat, level surface so that
the Nozzle tip is directed upwards and
away from the supporting surface.
3. Do not use the Glue Gun near
flammable materials.
4. Do not touch the tube of the heating
element or the Nozzle when they are hot.
They will be hot enough to cause burns
during use and for some time afterwards.
5. Do not use the Glue Gun on glass.
6. Do not heat up materials that can be
damaged by high temperatures.
7. Maintain labels and nameplates on the tool.
These carry important safety information.
If unreadable or missing, contact
Harbor Freight Tools for a replacement.
8. Avoid unintentional starting.
Prepare to begin work before
turning on the tool.
9. Do not leave the tool unattended when the
Battery Pack is connected. Turn off the tool,
and remove the Battery Pack before leaving.

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10. 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. 6#/*4",77D%,\&"9%/7,4"83%$.*%
W.,(3*(%&8%4,(/*$#%,89%('3#b%$.*D%,(*%8&$%
&87D%27,55,+7*>%+'$%$.*D%,7#&%&+#$('4$%
\*8$#%'89*(%$.*%W.,(3*(1%
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.
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.
Z"$."'5%<,$$*(D%F,2*$D%X,(8"83#
ZTPCT?V%<BPP6=T6F%FPR=6%B%ZB=Y6%
BVR?UP%R;%6U6=YQ%BU[%XTZZ%!6UP%
;T=6%R=%6cSZR[6%T;%VTFP=6BP6[-
1. [R%URP%[R%BUQ%R;%PC6%;RZZRXTUY%
PR%PC6%<BPP6=Q%SBW^-
a. R/*8>
b. [(&/>
c. F.&($J4"(4'"$>
d. S'84$'(*>
e. T84"8*(,$*>%&(
f. 6_/&#*%$&%$*5/*(,$'(*#%
3(*,$*(%$.,8%IdAe;1
2. ^**/%<,$$*(D%S,4]%9(D1
3. Charge Battery Pack only according
to its Charger’s instructions.
4. Inspect Battery Pack before every use;
do not use or charge if damaged.
%FB!6%PC6F6%TUFP=?WPTRUF1

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W.*4]%)"$.%,%H',7"2"*9%*7*4$("4",8%"2%D&'%,(*%"8%9&'+$%,#%$&%).*$.*(%$.*%&'$7*$%"#%
/(&/*(7D%3(&'89*91%%[&%8&$%5&9"2D%$.*%/&)*(%4&(9%/7'3%/(&\"9*9%)"$.%$.*%4.,(3*(1%%
[&%8&$%'#*%$.*%4.,(3*(%"2%$.*%/&)*(%4&(9%&(%/7'3%"#%9,5,3*91%%T2%9,5,3*9>%.,\*%"$%
(*/,"(*9%+D%,%#*(\"4*%2,4"7"$D%+*2&(*%'#*1%%T2%$.*%/7'3%)"77%8&$%2"$%$.*%&'$7*$>%.,\*%,%/(&/*(%&'$7*$%
"8#$,77*9%+D%,%H',7"2"*9%*7*4$("4",81 This appliance has a polarized plug (one blade is wider than
the other). To reduce the risk of electric shock, this plug is intended to fit in a polarized outlet only
one way. If the plug does not fit fully in the outlet, reverse the plug. If it still does not fit, contact a
qualified electrician. Do not modify the plug in any way.
6_$*8#"&8%W&(9#
U&$*- Extension cords must not be used with this item’s Charger.
FD5+&7&3D
Double Insulated
!Volts
fAlternating Current
BAmperes
8A%____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 Charger
ventilation ducts.
Charge on fireproof
surface only.
WARNING marking concerning
Risk of Electric Shock.
Properly connect
Charger’s power cord to
appropriate outlet.
WARNING marking concerning
Risk of Explosion.
Do not puncture, short, or
open battery packs and do not
charge damaged battery packs.

Page 7;&(%$*4.8"4,7%H'*#$"&8#>%/7*,#*%4,77%IJKKKJKLLJMNON1Item 57997
FB;6PQRS6=BPTRUVBTUP6UBUW6 F6P?S
F/*4"2"4,$"&8#
Battery Type Bauer 20V Li-ion 64816 (sold separately)
Charger Type Bauer 20V Li-ion 63947 (sold separately)
Maximum Temperature 455°F (Internal Nozzle)
Glue Stick Diameter Ø11 (sold separately)
F*$'/%J%<*2&(*%?#*-
%=*,9%$.*%6UPT=6%TVSR=PBUP%FB;6PQ%TU;R=VBPTRU%#*4$"&8%
,$%$.*%+*3"88"83%&2%$."#%5,8',7%"847'9"83%,77%$*_$%'89*(%
#'+.*,9"83#%$.*(*"8%+*2&(*%#*$%'/%&(%'#*%&2%$."#%/(&9'4$1
U&$*- For additional information regarding the parts listed in the following
pages, refer to Parts List and Diagram on page 11.
;'84$"&8#
Y7'*%F$"4]
E#&79%#*/,(,$*7DG
S&)*(%F)"$4.
P("33*(
U&gg7*
<,$$*(D%S,4]
E#&79%#*/,(,$*7DG
X&(]%Z"3.$

Page 8 ;&(%$*4.8"4,7%H'*#$"&8#>%/7*,#*%4,77%IJKKKJKLLJMNON1 Item 57997
FB;6PQ RS6=BPTRU VBTUP6UBUW6F6P?S
%R/*(,$"83%T8#$('4$"&8#
% =*,9%$.*%6UPT=6 TVSR=PBUP%FB;6PQ%TU;R=VBPTRU%#*4$"&8%
,$%$.*%+*3"88"83%&2%$."#%5,8',7%"847'9"83%,77%$*_$%'89*(%
#'+.*,9"83#%$.*(*"8%+*2&(*%#*$%'/%&(%'#*%&2%$."#%/(&9'4$1
W.,(3"83%<,$$*(D%S,4]
Charge battery before using this tool. Follow instructions
included with battery charger ( sold separately).
X&(]/"*4*%,89%X&(]%B(*,%F*$%?/
1. Designate a work area that is clean
and well lit. The work area must not
allow access by children or pets to
prevent distraction and injury.
2. Secure loose workpieces using a
vise or clamps (not included) to
prevent movement while working.
3. There must not be objects, such
as utility lines, nearby that will
present a hazard while working.
4. Remove all flammable and heat sensitive
materials from the work area.
5. Plan an insulated, non-flammable surface
for the gun to cool down on after use.
6. Keep multiple class ABC fire
extinguishers readily accessible while
working and while workpiece cools.
%Y*8*(,7%R/*(,$"83%T8#$('4$"&8#
1. Insert fully charged Battery Pack
into base of Glue Gun, making sure
it clicks into place securely.
XB=UTUYh %P&%/(*\*8$%#*("&'#%"8`'(D%&(%
/(&/*($D%9,5,3*>%9&%8&$%7*,\*%$.*%Y7'*%Y'8%
'8,$$*89*9%)."7*%(*#$"83%&8%#'(2,4*#%&(%
&+`*4$#1
WB?PTRUh [&%8&$%+7&4]%B"(%!*8$#%).*8%
Y7'*%Y'8%"#%"8%'#*>%"$%4&'79%4,'#*%$.*%$&&7%$&%
&\*(J.*,$1
2. Turn on Glue Gun by pushing Power Switch
and the LED should illuminate red. Allow
about two minutes for the Glue Gun to heat.
S&)*(%<'$$&8
Z6[
WB?PTRUh %P&%/(*\*8$%"8`'(D%&(%/(&/*($D%
9,5,3*-%%[&%8&$%$&'4.%&(%9(&/%,8D$."83%&8$&%
$.*%U&gg7*1
3. When the LED turns green the Glue Gun
has heated to operating temperature.
4. Load Glue Stick into the
back of the Glue Gun.
5. The Work Light may be illuminated by
pressing and holding the Power Switch.
6. Position the Nozzle over the workpiece
and squeeze the Trigger to push
the glue stick forward and hot glue
will expel from the Nozzle.
XB=UTUYh %P&%/(*\*8$%#*("&'#%"8`'(D>%
"847'9"83%+'(8#-%%[&%8&$%,77&)%$.*%.&$%37'*%$&%
$&'4.%#]"81
7. Apply glue in small amounts and
press the glued material together
until the hot glue has cooled.

Page 9;&(%$*4.8"4,7%H'*#$"&8#>%/7*,#*%4,77%IJKKKJKLLJMNON1Item 57997
FB;6PQRS6=BPTRUVBTUP6UBUW6 F6P?S
8. When the glue stick cannot not move forward,
insert a new glue stick behind it. Use the
glue stick until it is completely used up.
9. When finished with the Glue Gun, remove
glue stick and any remaining glue inside
the Glue Gun by pressing the Trigger until
all melted glue is expelled onto a piece
of foil or other heat resistant surface.
Once the glue has cooled, discard it.
10. To prevent accidents, turn off the Glue Gun
by pressing the Power Switch. The
Work Light and LED should turn off.
• Remove the Battery Pack after use.
• Allow the Glue Gun to cool down on an
insulated, non-flammable surface.
WB?PTRUh %B2$*(%'#*>%9&%8&$%$&'4.%
U&gg7*%'8$"7%"$%.,#%.,9%$"5*%$&%4&&71
WB?PTRUh%%[&%8&$%7*,\*%)&(]%,(*,%
'8$"7%Y7'*%Y'8%.,#%4&&7*91%%<*%,7*($%
2&(%"89"4,$"&8#%&2%4&84*,7*9%2"(*1
11. Allow time for the Glue Gun to cool
then clean and store the Glue Gun
indoors out of children’s reach.

Page 10 ;&(%$*4.8"4,7%H'*#$"&8#>%/7*,#*%4,77%IJKKKJKLLJMNON1 Item 57997
FB;6PQ RS6=BPTRU VBTUP6UBUW6F6P?S
V,"8$*8,84*%,89%F*(\"4"83
%S(&4*9'(*#%8&$%#/*4"2"4,77D%*_/7,"8*9%"8%$."#%5,8',7%5'#$%
+*%/*(2&(5*9%&87D%+D%,%H',7"2"*9%$*4.8"4",81
PR%S=6!6UP%F6=TR?F%TUi?=Q%;=RV%BWWT[6UPBZ%RS6=BPTRU-%
=*5&\*%<,$$*(D%S,4]%+*2&(*%/*(2&(5"83%,8D%"8#/*4$"&8>%
5,"8$*8,84*>%&(%47*,8"83%/(&4*9'(*#1
PR%S=6!6UP%F6=TR?F%TUi?=Q%;=RV%PRRZ%;BTZ?=6-%
[&%8&$%'#*%9,5,3*9%*H'"/5*8$1%%T2%,+8&(5,7%8&"#*%&(%\"+(,$"&8%
&44'(#>%.,\*%$.*%/(&+7*5%4&((*4$*9%+*2&(*%2'($.*(%'#*1
W7*,8"83>%V,"8$*8,84*>%,89%Z'+("4,$"&8
1. <6;R=6%6BWC%?F6> inspect the general
condition of the tool. Check for:
• loose hardware,
• misalignment or binding of moving parts,
• cracked or broken parts,
• blocked Air Vents,
• damaged electrical wiring, and
• any other condition that may
affect its safe operation.
2. B;P6=%?F6> wipe external surfaces
of the tool with clean cloth.
3. Li-Ion BATTERY MUST BE RECYCLED OR
DISPOSED OF PROPERLY.
Do not short, incinerate or open battery.
P(&'+7*#.&&$"83
S(&+7*5 S&##"+7*%W,'#*# Z"]*7D%F&7'$"&8#
Glue Gun will
not turn on.
1. Battery Pack discharged.
2. Battery Pack not properly
connected.
3. Internal damage or wear.
(Switch, for example.)
1. Recharge Battery Pack.
2. Remove Battery Pack and make sure there
are no obstructions. Reinsert Battery Pack
and press in firmly until it clicks in place.
3. Have technician service tool.
Temperature
insufficient.
Glue Gun not allowed enough
time to reach heat level.
Wait for a minute for the gun to
reach the desired heat level.
%;&77&)%,77%#,2*$D%/(*4,'$"&8#%).*8*\*(%9",38&#"83%&(%#*(\"4"83%$.*%
$&&71%%["#4&88*4$%/&)*(%#'//7D%+*2&(*%#*(\"4*1