Bauer 21506C-B User manual

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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. 21j
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 ma y n o t b e i n c l u d e 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 OPERATION MAINTENANCESETUP
Table of Contents
Safety ......................................................... 2
Specifications ............................................. 6
Setup .......................................................... 6
Operation.................................................... 8
Maintenance.............................................. 11
Parts List and Diagram.............................. 12
Warranty .................................................... 15
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.
IMPORTANT SAFETY INFORMATION
General Power Tool Safety Warnings
Read all safety warnings, instructions, illustrations and specifications provided with this power tool.
Failure to follow all instructions listed below 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 mains-operated (corded)
power tool or battery-operated (cordless) power tool.
1. Work area safety
a. Keep work area clean and well lit.
Cluttered or dark areas invite accidents.
b. 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.
c. Keep children and bystanders away
while operating a power tool. Distractions
can cause you to lose control.

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SAFETYOPERATIONMAINTENANCE SETUP
2. Electrical safety
a. 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.
b. 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.
c. Do not expose power tools to rain or wet
conditions. Water entering a power tool
will increase the risk of electric shock.
d. 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.
e. 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.
f. If operating a power tool in a damp location
is unavoidable, use a ground fault circuit
interrupter (GFCI) protected supply. Use of
a GFCI reduces the risk of electric shock.
3. Personal safety
a. INJECTION HAZARD!
Hold the end of the hose by the
spring guard only. Keep hands
away from exposed rubber part of
hose. Through improper use, grease can be
injected through a person’s skin, leading to
serious injury, possibly amputation. If grease is
accidentally injected into someone’s skin,
contact a doctor immediately. Do not treat an
injection injury as a simple cut. Injection can lead
to amputation and requires immediate surgical
treatment.
b. 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.
c. Do not stare at operating lamp.
d. Use personal protective equipment.
Always wear eye protection. Protective
equipment such as dust mask, non-skid safety
shoes, hard hat, heavy-duty work gloves,
or hearing protection used for appropriate
conditions will reduce personal injuries.
e. Prevent unintentional starting. Ensure the
switch is in the off-position before connecting
to power source and/or battery pack, 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.
f. 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.
g. Do not overreach. Keep proper footing and
balance at all times. This enables better control
of the power tool in unexpected situations.
h. 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.
i. 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.
j. 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.
k. 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.
l. Do not leave the tool unattended when the
Battery Pack is connected. Turn off the tool,
and remove the Battery Pack before leaving.
m. This product is not a toy.
Keep it out of reach of children.
n. 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.
o. 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.

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SAFETY OPERATION MAINTENANCESETUP
4. Power tool use and care
a. 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.
b. Do not use the power tool if the switch
does not turn it on and off. Any power
tool that cannot be controlled with the switch
is dangerous and must be repaired.
c. Disconnect the plug from the power
source and/or remove the battery pack,
if detachable, 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.
d. 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.
e. 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.
f. Keep cutting tools sharp and clean. Properly
maintained cutting tools with sharp cutting edges
are less likely to bind and are easier to control.
g. 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.
h. 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.
5. Service
a. 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.
b. Never service damaged battery packs. Service
of battery packs should only be performed by the
manufacturer or authorized service providers.
c. Maintain labels and nameplates on the tool.
These carry important safety information.
If unreadable or missing, contact
Harbor Freight Tools for a replacement.
6. Battery tool use and care
a. 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.
b. 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.
c. 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.
d. Use power tools only with specifically
designated battery packs. Use of any other
battery packs may create a risk of injury and fire.
e. 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.
f. 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.
g. 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.
h. 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.
i. 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.
j. Have servicing performed by a qualified
repair person using only identical
replacement parts. This will ensure that
the safety of the product is maintained.
k. Do not modify or attempt to repair the power
tool or the battery pack except as indicated
in the instructions for use and care.

Page 5For technical questions, please call 1-888-866-5797.Item 58608
SAFETYOPERATIONMAINTENANCE SETUP
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. 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.
7. Lithium Battery Safety Warnings
LITHIUM BATTERIES STORE
A LARGE AMOUNT OF ENERGY AND
WILL VENT FIRE OR EXPLODE
IF MISTREATED:
a. Keep Battery Pack dry.
b. DO NOT DO ANY OF THE FOLLOWING
TO THE BATTERY PACK:
• Open,
• Drop,
• Short-circuit,
• Puncture,
• Incinerate, or
• Expose to temperatures greater than 265°F.
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.
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 charger. Do not use the charger
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.
Extension Cords
Note: Extension cords must not be used with this item’s Charger.
Symbology
Double Insulated
VVolts
~Alternating Current
AAmperes
n0xxxx/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.
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.

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SAFETY OPERATION MAINTENANCESETUP
Specifications
Battery Type 20V Bauer Li-ion (64816, 57007)
Charger Type 20V Bauer Li-ion (57006)
Maximum Pressure 10,000 PSI
Grease Cartridge Capacity 14.5 oz.
Maximum Flow Rate 5 oz/min.
Hose Outlet Threads (Tool) 7/16 UNEF
Hose Outlet Threads
(Coupler Side) 1/8" NPT
Outlet Threads (Filler Port) 1/8″NPT
Hose Length 36″
Setup - Before Use:
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.
Note: For additional information regarding the parts listed in the
following pages, refer to Parts List and Diagram on page 12.
Charging
Follow instructions included with the Charger, sold separately.
Functions
Grease
Coupler
36″Hose
Grease
Tube
Variable Speed
Trigger
Pressure
Relief Valve
Air Bleed
Valve
Follower Rod
Handle
Motor
End Cap
LED
Light
Bulk Loading
Port

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SAFETYOPERATIONMAINTENANCE SETUP
Variable Speed Trigger
The tool will produce a higher volume of grease as more force is placed on the Variable Speed Trigger. To unlock
the Trigger for use, press Trigger Lock in from the left side of tool.
Trigger
Trigger Lock
LED Light
The LED light is activated by pulling the Trigger and will automatically shut off after 20 seconds of use. The light can
be turned off manually by pressing the LED Power Button.
LED
Light
LED Power
Button
Pressure Relief Valve
If maximum PSI is exceeded, grease will come out of the Pressure Relief Valve, indicating a line blockage. If
tool continues to run while blocked, the motor will overload and tool will stall. To clear blockage, see Clearing
Contaminants section on page 9.
Pressure
Relief Valve
Shoulder Strap
The Shoulder Strap will connect to the tool at two points:
a. The strap mounting hole located
beside the Air Bleed Valve.
b. A retractable hook located at the back
end of the motor. The retractable hook
must be pulled out manually for use.
Motor (mounting hook inside)
Strap
Mount

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SAFETY OPERATION MAINTENANCESETUP
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.
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. There must not be objects, such as utility lines,
nearby that will present a hazard while working.
Setting and Testing
TO PREVENT SERIOUS INJURY FROM ACCIDENTAL OPERATION:
Make sure that the Trigger is locked and Battery Pack is removed
before performing any procedure in this section.
Loading the Grease Gun with a Grease Cartridge
1. Pull back on Follower Rod Handle until the
Follower Rod is fully extended. Pull Follower
Rod sideways to latch it into the slot on the End
Cap of the Grease Tube, locking it open.
2. Unscrew and remove Grease Tube
from Grease Gun Head Assembly.
3. Remove the cap from a grease cartridge (not
included), and insert the cartridge into Grease Tube.
4. Remove the pull tab from the grease
cartridge and screw the Grease Tube
back into the Head Assembly.
5. Open Air Bleed Valve.
6. Release Follower Rod from the slot on
the End Cap to allow the Follower Rod to
move forward into the Grease Tube.
Loading the Grease Gun from a Bulk Container
1. Unscrew and remove the Grease Tube
from the Grease Gun Head Assembly.
2. Insert the open end of Grease Tube into lubricant.
Slowly pull the Follower Rod back while pushing the
Grease Tube deeper into the lubricant to prevent air
pockets from being pulled into the Grease Tube.
3. When the Follower Rod is fully extended, pull
it sideways to latch the Rod into the slot on the
End Cap of the Grease Tube, locking it open.
4. Screw the Grease Tube into the Head Assembly.
5. Release the Follower Rod from the slot on the
End Cap of the Grease Tube to allow the Follower
Rod to move forward into the Grease Tube.
6. Clean any excess grease off the
outer body of the Grease Gun.
Loading the Grease Gun with a Filler Pump
1. Pull back on the Follower Rod Handle until
the Follower Rod is fully extended.
2. Remove plug on Bulk Loading Port.
3. Place bulk filler nipple (sold separately)
on the Port and insert into the socket
of filler pump (sold separately). Verify
socket is fastened securely to Valve.
4. Operate the filler pump until the
Grease Tube is filled.
5. Disconnect the bulk filler nipple from
the socket on the filler pump.
6. Move the Follower Rod forward
into the Grease Tube.

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SAFETYOPERATIONMAINTENANCE SETUP
Clearing Contaminants
Note: Contaminants can be pulled into the tool and clog
the valve. See Troubleshooting section on page 11
for contamination causes. To clear any contamination:
Hose Removal:
1. Remove the Hose Assembly.
2. Pull Trigger for 45 seconds. If grease begins to
flow then the contamination has been cleared.
3. Replace Hose Assembly and operate the tool.
Check Valve:
1. Locate the Check Valve that sits below
the Pressure Relief Valve.
Check Valve
Hose
Assembly
Pressure
Relief Valve
2. Remove the Bolt and Washer from the Check
Valve and pull Trigger for 15 seconds.
3. If a Spring and Ball are expelled from the Check
Valve, clean both parts with a clean cloth.
4. Inspect the open Check Valve for any contaminants.
If found, run Grease Gun to flush out contaminants.
5. Replace the Ball, Spring, Washer, and
Bolt in order shown, securing tightly.
Bolt
Ball
Spring
Washer
6. Pull Trigger for 30 seconds and operate the tool.

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SAFETY OPERATION MAINTENANCESETUP
General Instructions for Use
TO PREVENT SERIOUS INJURY FROM INJECTION: Wear ANSI-approved
eye protection and heavy-duty work gloves during use.
1. Make sure that the Trigger is in the
off-position, then attach the Battery Pack.
2. Prime Gun by simultaneously squeezing
the Trigger and opening the Air
Bleed Valve to expel any air pockets.
3. If grease will not flow, then air pockets likely remain:
a. Pull back on the Follower Rod Handle until
the Follower Rod is fully extended.
b. Open Air Bleed Valve and pull Trigger
repeatedly to pump grease through the Valve.
c. Push Follower Rod back into Grease Tube.
4. Clean the grease zerk fitting of the object to
be lubricated carefully and completely with
a clean cloth prior to attaching the Grease
Gun’s Coupler onto the zerk fitting.
5. Attach the Coupler by pressing it straight onto
the clean grease zerk fitting. Make sure that
the Coupler is fully seated on the zerk fitting.
WARNING! TO REDUCE THE RISK OF SERIOUS
INJURY FROM INJECTION:
It may be necessary to hold the Coupler in place
on the zerk fitting while lubricating. While wearing
heavy-duty work gloves, hold the end of the
hose by the spring guard only. Keep hands
away from exposed rubber part of hose.
6. Squeeze the Trigger several times or
until a small amount of grease begins
to flow out of the greased bushing.
7. When greasing is complete, lock Trigger Lock,
then tilt Coupler, twist nozzle of grease gun,
and pull back to remove from zerk fitting.
(See below.) Wipe any excess grease from
exterior of the grease fitting and Coupler.
To Remove:
Tilt, Twist & P
ull
8. 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.