Bauer 1781C-B1 Assembly instructions
Visit our website at: http://www.harborfreight.com
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. 21h
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.
Read this material before using this product.
Failure to do so can result in serious injury.
SAVE THIS MANUAL.
Page 2 For technical questions, please call 1-888-866-5797. Item 64755
SAFETY OPERATION MAINTENANCESETUP
Table of Contents
Safety ......................................................... 2
Specifications ............................................. 7
Setup .......................................................... 7
Operation.................................................... 8
Maintenance.............................................. 10
Parts List and Diagram.............................. 11
Warranty .................................................... 12
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 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.
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
3. Keep children and bystanders
away while operating a power tool.
Distractions can cause you to lose control.
Page 3For technical questions, please call 1-888-866-5797.Item 64755
SAFETYOPERATIONMAINTENANCE SETUP
Electrical Safety
Do not expose power tools to rain or wet conditions.
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.
2. Use personal protective equipment.
Always wear eye protection. Protective
3. Prevent unintentional starting.
Ensure the Trigger is in the off-position before
connecting to power source, picking up or
carrying the tool.
have the Trigger on invites accidents.
4. Remove any adjusting key or wrench
before turning the power tool on.
5. Do not overreach. Keep proper footing and
balance at all times. This enables better control
6. Dress properly. Do not wear loose clothing or
jewelry. Keep your hair, clothing and gloves
away from moving parts. Loose clothes, jewelry
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. Only use safety equipment that has been
approved by an appropriate standards agency.
Power Tool Use and Care
1. Do not force the power tool. Use the
correct power tool for your application.
safer at the rate for which it was designed.
2. Do not use the power tool if the Trigger
does not turn it on and off.
3. Disconnect the battery pack from the
power tool before making any adjustments,
changing accessories, or storing power
tools.
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. 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
6. Keep cutting tools sharp and clean.
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
intended could result in a hazardous situation.
Page 4 For technical questions, please call 1-888-866-5797. Item 64755
SAFETY OPERATION MAINTENANCESETUP
Battery tool use and care
1. Recharge only with the charger specified by
the manufacturer. A charger that is suitable
2. Use power tools only with specifically
designated battery packs. Use of any other
3. 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.
4. 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.
Service
Have your power tool serviced by a qualified repair person using only identical replacement parts.
Impact Driver Safety Warnings
1. Hold power tools by insulated gripping surfaces
when performing an operation where the cutting
tool may contact hidden wiring or its own cord.
2. Maintain labels and nameplates on the tool.
These carry important safety information.
If unreadable or missing, contact
Harbor Freight Tools for a replacement.
3. Avoid unintentional starting.
Prepare to begin work before turning on the tool.
4. 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.
5. When using a handheld power tool,
maintain a firm grip on the tool with both
hands to resist starting torque.
6. Do not leave the tool unattended when the
Battery Pack is connected. Turn off the tool,
and remove the Battery Pack before leaving.
7. 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.
8. This product is not a toy.
Keep it out of reach of children.
9. 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.
10. 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 5For technical questions, please call 1-888-866-5797.Item 64755
SAFETYOPERATIONMAINTENANCE SETUP
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:
a. Open,
b. Drop,
c. Short-circuit,
d. Puncture,
e. Incinerate, or
f. Expose to temperatures greater than 140°F.
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.
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 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.
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.
Page 6 For technical questions, please call 1-888-866-5797. Item 64755
SAFETY OPERATION MAINTENANCESETUP
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 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.
WARNING marking concerning
Risk of Explosion.
Do not puncture, short, or open
battery packs and do not charge
damaged battery packs.
Page 7For technical questions, please call 1-888-866-5797.Item 64755
SAFETYOPERATIONMAINTENANCE SETUP
Specifications
Battery Rating 20 V / 1.5 Ah
Battery Type Li-ion
No Load Speed 0-2900 RPM
Chuck Size 1/4" Hex
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 11.
Functions
Direction
Switch
Work
Light
Work
Light
Work
Light
Battery
Trigger
Chuck
Page 8 For technical questions, please call 1-888-866-5797. Item 64755
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.
Tool Set Up
TO PREVENT SERIOUS INJURY FROM ACCIDENTAL OPERATION:
Make sure that the Trigger is in the off-position and remove its Battery
Pack before performing any procedure in this section.
Batter Charging
Charge battery after unpacking and before using this tool. Follow instructions included with battery charger.
Attaching/Removing Accessories
CAUTION! Only use 1/4" hex shank bits
designed for impact use. Verify bit fits
the Chuck precisely before use.
1. Pull Collar forward and insert an appropriate
impact-rated accessory into the hex drive Chuck.
Pull on bit to ensure it is secure.
2. To remove, pull Collar forward, remove bit
from Chuck and then release Collar.
Collar
Attaching Belt Clip
Attach Belt Clip to Handle using supplied Screw.
Clip may be attached to either side.
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 objects, such as utility lines,
nearby that will present a hazard while working.
Screw
Belt Clip
Page 9For technical questions, please call 1-888-866-5797.Item 64755
SAFETYOPERATIONMAINTENANCE SETUP
General Operating Instructions
1. Make sure that the Trigger is in the
off-position, then attach the Battery Pack.
2. Insert an appropriate impact-rated
accessory into the driver.
3. Set Direction Switch.
Forward: Push Switch in on right side
(arrow pointing forward) for clockwise rotation.
Reverse: Push Switch in on left
side (arrow pointing backward) for
counter-clockwise rotation.
Trigger Lock: Push Switch to the
center to lock the Trigger.
CAUTION! Set Direction Switch to center
Trigger Lock position during set up, when
changing bits or when tool is idle.
Push
for
Forward
Push
for
Reverse
Push to Center toPush to Center to
LOCK TRIGGERLOCK TRIGGER
4. Install bit and select direction of rotation.
NOTICE: Do not change direction of rotation
while Chuck is rotating. Wait until Chuck has come
to a complete stop before changing direction.
5. Press Trigger to start the tool. The Work Lights
will turn on when Trigger is pressed and turn
off a few seconds after Trigger is released.
6. The tool has variable speed.
To increase speed, apply more pressure to Trigger.
To decrease speed, lessen pressure on Trigger.
7. Tighten or loosen the fastener(s) as required.
Note: The amount of actual torque will vary depending
on the cleanness and condition of the threads and
other factors. If tightening critical components,
chase threads before assembling components and
check the actual torque applied to the fastener
with a mechanical torque wrench (not supplied).
8. When finished using the Impact Driver, release
Trigger and center Direction Switch to lock Trigger.
9. To prevent accidents, turn off the tool and
remove its Battery Pack after use. Clean, then
store the tool indoors out of children’s reach.
Page 10 For technical questions, please call 1-888-866-5797. Item 64755
SAFETY OPERATION MAINTENANCESETUP
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 Trigger is in the off-position and remove its Battery
Pack before performing any procedure in this section.
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
• misalignment or binding of moving parts
• cracked or broken parts
• any other condition that may
affect its safe operation.
2. AFTER USE, 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.
4. Disconnect battery pack and store battery pack,
charger, and tool in dry, indoor area out of
reach of children and away from metal objects
(i.e., paperclips, coins) to prevent shorting.
Page 11For technical questions, please call 1-888-866-5797.Item 64755
SAFETYOPERATIONMAINTENANCE SETUP
PLEASE READ THE FOLLOWING CAREFULLY
THE MANUFACTURER AND/OR DISTRIBUTOR HAS PROVIDED THE PARTS LIST AND ASSEMBLY DIAGRAM
IN THIS MANUAL AS A REFERENCE TOOL ONLY. NEITHER THE MANUFACTURER OR DISTRIBUTOR
MAKES ANY REPRESENTATION OR WARRANTY OF ANY KIND TO THE BUYER THAT HE OR SHE IS
QUALIFIED TO MAKE ANY REPAIRS TO THE PRODUCT, OR THAT HE OR SHE IS QUALIFIED TO REPLACE
ANY PARTS OF THE PRODUCT. IN FACT, THE MANUFACTURER AND/OR DISTRIBUTOR EXPRESSLY
STATES THAT ALL REPAIRS AND PARTS REPLACEMENTS SHOULD BE UNDERTAKEN BY CERTIFIED AND
LICENSED TECHNICIANS, AND NOT BY THE BUYER. THE BUYER ASSUMES ALL RISK AND LIABILITY
ARISING OUT OF HIS OR HER REPAIRS TO THE ORIGINAL PRODUCT OR REPLACEMENT PARTS
THERETO, OR ARISING OUT OF HIS OR HER INSTALLATION OF REPLACEMENT PARTS THERETO.
Parts List and Diagram
Part Description Qty
1 Screw 4
2 Spring Washer 4
3 Shield 1
4 Lampshade 1
5 Screw 3
6 LED Circuit Board 1
7 Board 1
8 Gearbox 1
Part Description Qty
9 Directional Switch 1
10 Trigger Assembly 1
11 Housing 2
12 Screw 9
13 Battery Terminal 1
14 Battery Pack 1
15 Belt Clip 1
16 Screw 1
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.
26541 Agoura Road • Calabasas, CA 91302 • 1-888-866-5797
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.
This manual suits for next models
1
Table of contents
Other Bauer Impact Driver manuals
Popular Impact Driver manuals by other brands
Bosch
Bosch PS41 Operating/safety instructions
Ingersoll-Rand
Ingersoll-Rand w360 series Product information
Fein
Fein ASb 110 Operating instruction
Makita
Makita 6953 instruction manual
Bosch
Bosch GDS18V-740C operating instructions
Harbor Freight Tools
Harbor Freight Tools 95666 Assembly and operating instructions
