18 VDC - IMPACT DRIVER
94371
ASSEMBLY AND OPERATING INSTRUCTIONS
Due to continuing improvements, actual product may
differ slightly from the product described herein.
3491 Mission Oaks Blvd., Camarillo, CA 93011
Visit our W eb site at http://www.harborfreight.com
Copyright © 2006 by Harbor Freight Tools®. All rights reserved. No por tion of this
manual or any artwork contained herein may be reproduced in any shape or form
without the express written consent of Harbor Freight T ools .
For technical questions and replacement parts, please call 1-800-444-3353
Specifications
Item Description
B a tte ry 18 VD C, 1 .3 A H, N i-Cd type
Torque 1 044 IN.LBS (maximum )
Speed 1700 BP M ; 0-1600 RPM
Switch Toggle, F orward / Reverse
Drive Size ¼ inch
Weight 4.15 lbs.
Save This Manual
You will need the manual for the safety w arnings and precautions, assembly
instructions, operating and maintenance procedures, parts list and diagram. Keep
your invoice with this man ual. Write the invoice number on the inside of the front
cover. Keep the manual and invoice in a safe and dry place for future reference.
Safety Warnings and Precautions
WARNING: When using tool, basic safety precautions should always be followed to reduce the risk of personal injury and damage to equipment.
Read all instructions before using this tool!
1. Keep work area clean. Cluttered areas invite injuries.
2. Observe work area conditions. Do not use machines or pow er tools in
damp or wet locations. Don’t e xpose to r ain. Keep work area well lighted.
Do not use electrically powered tools in the presence of flammable gases or
liquids.
3. Keep children away. Children must never be allowed in the w ork area. Do
not let them handle machines, tools, or extension cords .
4. Store idle equipment. When not in use, tools must be stored in a dry
location to inhibit rust. Always lock up tools and keep out of reach of children.
5. Use the right tool for the job. Do not attempt to force a small tool or
attachment to do the work of a larger industrial tool. There are certain
applications for which this tool was designed. It will do the job better and
more safely at the rate f or which it w as intended. Do not modify this tool and
do not use this tool for a purpose for which it was not intended.
6. Dress properly. Do not wear loose clothing or jewelry as they can be caught
in moving parts. Protectiv e, electrically non-conductiv e clothes and non-skid
footwear are recommended when working. Wear restrictive hair covering to
contain long hair.
SKU 94371 For technical questions, please call 1-800-444-3353 Page 2
7. Use eye and ear protection. Always wear ANSI approved impact saf ety
goggles and ear plugs when using the Impact Driver.
8. Do not overreach. Keep proper footing and balance at all times. Do not
reach over or across running machines.
9. Maintain tools with care. Keep tools sharp and clean for better and safer
performance. Follo w instructions for lubricating and changing accessories.
The handles must be kept clean, dry, and free from oil and grease at all
times.
10. Remove adjusting keys and wrenches. Check that keys and adjusting
wrenches are removed from the tool or machine work surf ace bef ore use.
11. Av oid unintentional starting. Be sure the switch is in the Off position when
not in use. Do not carry any tool with your finger on the trigger.
12. Stay alert. Watch what you are doing, use common sense. Do not operate
any tool when you are tired.
13. Check for damaged parts. Before using any tool, any part that appears
damaged should be carefully checked to determine that it will operate
properly and perform its intended function. Chec k f or alignment and binding
of moving parts; any broken parts or mounting fixtures; and any other
condition that may affect proper oper ation. Any part that is damaged should
be properly repaired or replaced by a qualified technician. Do not use the tool
if any switch does not turn On and Off properly.
14. Replacement parts and accessories. When servicing, use only identical
replacement parts. Use of any other parts will void the warranty. Only use
accessories intended for use with this tool. Appro v ed accessories are
available from Harbor Freight Tools.
15. Do not operate tool if under the influence of alcohol or drugs. Read
warning labels if taking prescription medicine to determine if your judgment or
reflexes are impaired while taking drugs. If there is any doubt, do not operate
the tool.
16. Maintenance. F or y our safety, service and maintenance should be
performed regularly by a qualified technician.
17. WARNING! People with pacemakers should consult their physician(s) before
using this product. Electromagnetic fields in close pro ximity to a heart
pacemaker could cause interference to , or failure of, the pacemaker.
18. Use tools with both hands when required. Man y tools such as chain
saws, drills, routers, etc., require the use of both hands when operating. This
helps maintain tool stability and keeps hands awa y from the w orking area of
the tool.
Note: P erformance of this tool may v ary depending on variations in tool battery power.
SKU 94371 For technical questions, please call 1-800-444-3353 Page 3
Battery Precautions
1. Read all instructions and warnings on the battery before charging the battery.
2. To avoid accidents, charge the supplied battery only. Do not use a different
charger with this battery .
3. Do not expose the battery to rain or wet conditions.
4. To avoid damage of cable and plug, ne v er pull the cab le to disconnect the
charger.
5. Do not use the charger if the cable or plug are damaged.
6. Repairs should be carried out by a qualified technician.
7. Do not touch the battery poles with any conductive source.
8. Do not store the battery in a box with other metal objects.
9. Do not throw the battery in a fire or in the general trash. Contact your local
hazardous waste disposal authority for proper disposal.
10. Do not drain the battery completely before recharging. Recharge fully.
11. Always switch to a fresh battery when tool performance begins to diminish.
Severe heat is most destructive to a battery; the more heat generated, the
faster the battery loses power . A battery that gets too hot can be permanently
damaged. Never over-discharge a battery by using the tool even after tool
performance is decreasing. Never attempt to discharge a tool’s battery by
continuing to pull the tool trigger. When tool performance begins to diminish,
stop the tool, recharge the battery and use the fresh battery for optimal
performance.
12. Recharge the battery monthly even if not used.
13. Always remo v e the battery from the Impact Driver bef ore perf orming
inspection, maintenance, cleaning procedures, or storage.
14. Caution: Ne v er charge Battery for more than 5 hours continuously. Charger
Adapter should not be left plugged in or charging for more than 5 hours.
Warning: The warnings, cautions, 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.
SKU 94371 For technical questions, please call 1-800-444-3353 Page 4
Unpacking
When unpacking, check to make sure the f o llowing parts are included:
Impact Driver, Battery, Charger Base, and Charger Adapter.
If any parts are missing or broken, please call Harbor Freight Tools at the n umber
on the cover of this manual.
Operation
CHARGING BATTERY
The Battery (30) does not come charged from the factory . Charge before using.
Refer to photos on the next page .
1. Push the two side buttons in on the Battery, then slide the Battery off the
Impact Driver handle.
2. Slide the Battery into the Charger Base (48). The battery can only insert one
way using the guide tabs.
3. Plug the Charger Adapter (49) output cord into the Charger Base connector .
4. Plug the Charger Adapter line cord into an electrical outlet.
V erify on the Charger Base that the red charging indicator light come on. If it
does not come on, check the power connection or try a different wall outlet.
Charge the new Battery for 5 hours. Subsequent charges will take 4 to 5
hours.
5. Unplug the Charger Base from the electrical outlet when the Battery is fully
charged. The Charging Indicator will flash red.
Note: The operation time of a new battery will ramp up as it is properly used (drained)
and recharged. It will take about 5 recharging cycles before the Battery is at maximum efficiency .
Caution: If two or more batteries are to be c harged, av oid damaging the Charger
by allowing it to cool down between char ges. W ait for the Battery to cool down
before placing in the Impact Driver .
SKU 94371 For technical questions, please call 1-800-444-3353 Page 5
Charging
Indicator
Charger Base (48)
Battery (30)
Charger Adapter (49)
INSERTING BATTERY
Caution: Before inserting the Battery into the tool, be certain that the Trigger
Switch (21) is in the Off position.
1. Push the Forward/Reverse Button (31) to the center position to lock the
Switch in the Off position.
2. Insert Battery into the receptacle at the handle-bottom of the Impact Driver.
3. Secure the Lock-spring Clasps to each side of the handle.
SCREWDRIVER
1. Insert a hex screwdriver bit (not provided) into the Chuc k. See photos on the
next page.
2. Press the Forward / Reverse Switch (31) to desired position.
Forward position
fasteners or freeing screws (countercloc kwise rotation).
: f asten (cloc kwise rotation).
Reverse position
Center
: remo ving
position:
locked.
3. Press (and hold) the Variable Speed Switch to turn on.
This Switch varies the speed depending on how far in it is pressed.
Av oid o verloading the Impact Driver. Do not apply excessive pressure or speed
while driving screws. If the drill speed drops abnormally, decrease pressure
immediately. If the bit stops abruptly, or the bit becomes stuck, release Switch at
once.
SKU 94371 For technical questions, please call 1-800-444-3353 Page 6
Driver Bit
(not supplied)
Forward / Reverse
Rotation Button
Trigger Switch (21)
Variable Speed
Lock-spring Clasps
Troubleshooting
Symptom Possible Cause Remedy
Trigger Switch locked
in place.
Impact Wrench
operates slowly or
without force.
Impact Wrench does
not turn on.
Battery will not hold
charge.
Forward / Reverse
button in center
position.
Battery weak. Recharge Battery
Battery completely
discharged.
Battery dead. Replace with new Battery.
Move button to the left or
right for forward or reverse
operation.
completely.
Recharge Battery
completely.
Maintenance
1. Keep tools clean b y wiping with a damp cloth.
2. Store tools in carrying case when not using; avoid storing in high temperature
areas.
3. When the battery becomes weak, and the tool loses power , keep the tool turned
On until the battery is completely drained before recharging. This will ensure a
full recharge.
4. Recharge battery monthly when not in use to maintain battery life. When the
battery is spent it will need to be properly disposed of. Harbor Freight Tools
offers a no-cost battery recycling program; for details, call 1-800-444-3353.
5. Using a rag and light oil, wipe bits and other steel parts to keep them from
rusting.
SKU 94371 For technical questions, please call 1-800-444-3353 Page 7
Parts List
Part
No. Description Qty
1 Left Housing 1
2 Right Housing 1
3 Strap 1
4 Axle Bearing 1
5 Bushing - 1 1
6 Bushing - 2 1
7 Center Shaft 1
8 Battery Housing 1
9 Steel Ball 3
11 Inner Gear 1
12 Motor Housing 1
13 Washer M4 4
14 Motor 1
16 Planet Gear 2
17 Planet Shaft 2
18 Shaft 1
19 Block 1
20 Spring 1
21 Switch 1
23 Top Case 1
24 Motor Gear 1
25 Bolt M3 15 5
26 Bolt M4 15 2
27 Bolt M3 10 5
28 Bolt M4 35 4
29 Terminal 2
30 Battery 1
31 Button, Forward/Reverse 1
32 Spring 1
33 Steel Ball 1
34 Chuck 1
35 Rotation Shaft 1
36 Bottom Plate 1
37 Radiator 1
38 Wire (Red) “+” 1
39 Wire (Black) “-” 1
Part
No. Description Qty
40 Wire (Red) “+” 1
41 Wire (Black) “-” 1
42 Wire (Yellow) 1
43 Wire (Blue) 1
44 Magnet - Ring 2
45 Capacitor 2
46 Washer 1
47 Bushing 1
48 Charger Base 1
49 Charger Adapter 1
NOTE: Some parts are listed and shown for illustration purposes only and are not
available individually as replacement parts.
SKU 94371 For technical questions, please call 1-800-444-3353 Page 8
Assembly Drawing
PLEASE READ THE FOLLOWING CAREFULLY
THE MANUFACTURER AND/OR DISTRIBUTOR HAS PROVIDED THE PARTS DIAGRAM
IN THIS MANUAL AS A REFERENCE TOOL ONLY. NEITHER THE MANUFA CTURER NOR
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 INSTALLA TION
OF REPLACEMENT PARTS THERETO.
SKU 94371 For technical questions, please call 1-800-444-3353 Page 9
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