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
Copyright © 2006 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.
For technical questions and replacement parts, please call 1-800-444-3353
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7. Use eye and ear protection. Always wear ANSI approved impact safety
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. Follow 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 surface before use.
11. Avoid 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. Check for alignment and binding
of moving parts; any broken parts or mounting fixtures; and any other
condition that may affect proper operation. 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. Approved 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. For your 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 proximity to a heart
pacemaker could cause interference to, or failure of, the pacemaker.
18. Use tools with both hands when required. Many tools such as chain
saws, drills, routers, etc., require the use of both hands when operating. This
helps maintain tool stability and keeps hands away from the working area of
the tool.
Note:Performance of this tool may vary depending on variations in tool battery power.
SKU 94371
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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, never pull the cable 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 remove the battery from the Impact Driver before performing
inspection, maintenance, cleaning procedures, or storage.
14. Caution: Never 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 instruc-
tion manual cannot cover all possible conditions and situations that may oc-
cur. 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
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Page 4
Unpacking
When unpacking, check to make sure the following 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 number
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.
Verify 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 maxi-
mum efficiency.
Caution:If two or more batteries are to be charged, avoid damaging the Charger
by allowing it to cool down between charges.Wait for the Battery to cool down
before placing in the Impact Driver.
SKU 94371
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Page 5
Charger Base (48)
Charging
Indicator
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 Chuck. See photos on the
next page.
2. Press the Forward / Reverse Switch (31) to desired position.
Forward position: fasten (clockwise rotation). Reverse position: removing
fasteners or freeing screws (counterclockwise rotation). Center 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.
Avoid overloading 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
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Page 6
Driver Bit (not supplied)
Forward / Reverse
Rotation Button
Trigger Switch (21)
Variable Speed
Lock-spring Clasps
Troubleshooting
Symptom
Possible Cause
Remedy
Move button to the left or
right for forward or reverse
operation.
Trigger Switch locked Forward / Reverse
in place.
button in center
position.
Impact Wrench
operates slowly or
without force.
Battery weak.
Recharge Battery
completely.
Impact Wrench does
not turn on.
Battery completely
discharged.
Recharge Battery
completely.
Battery will not hold
charge.
Battery dead.
Replace with new Battery.
Maintenance
1. Keep tools clean by 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
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Page 7
Parts List
Part
No.
1
2
3
4
5
6
7
Part
Description
Left Housing
Right Housing
Strap
Qty
No.
40
41
42
43
44
45
46
47
48
49
Description
Wire (Red) “+”
Wire (Black) “-”
Wire (Yellow)
Wire (Blue)
Magnet - Ring
Capacitor
Washer
Qty
1
1
1
1
2
2
1
1
1
1
1
1
1
1
1
1
3
1
1
4
1
2
2
1
1
1
1
1
1
5
2
5
4
2
1
Axle Bearing
Bushing - 1
Bushing - 2
Center Shaft
Battery Housing
Steel Ball
Inner Gear
Motor Housing
Washer M4
Motor
Planet Gear
Planet Shaft
Shaft
Block
Spring
8
9
Bushing
Charger Base
Charger Adapter
1
1
11
12
13
14
16
17
18
19
20
21
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
Switch
Top Case
Motor Gear
Bolt M3 15
Bolt M4 15
Bolt M3 10
Bolt M4 35
Terminal
Battery
Button, Forward/Reverse 1
Spring
Steel Ball
1
1
1
1
1
1
1
1
Chuck
Rotation Shaft
Bottom Plate
Radiator
Wire (Red) “+”
Wire (Black) “-”
NOTE: Some parts are listed and shown for illustration purposes only and are not
available individually as replacement parts.
SKU 94371
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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 MANUFACTURER 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 INSTALLATION
OF REPLACEMENT PARTS THERETO.
SKU 94371
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Page 9
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