2” SPOT WELD AIR DRILL2” SPOT WELD AIR DRILL
2” SPOT WELD AIR DRILL2” SPOT WELD AIR DRILL
2” SPOT WELD AIR DRILL
ASSEMBLY AND OPERATING INSTRUCTIONS
3491 Mission Oaks Blvd., Camarillo, CA 93011
Visit our Web site at http://www.harborfreight.com
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
93900
Due to continuing improvements, actual product may
differ slightly from the product described herein.
SKU 93900 For technical questions, please call 1-800-444-3353. Page 2
Specifications
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Save this Manual
You will need the manual for the safety warnings and precautions, assembly instruc-
tions, operating and maintenance procedures, parts list and diagram. Keep your
invoice with this manual. 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. Disconnect air before servicing. Do not attempt to disassemble, or service
tool with air hose attached.
2. Use only specified operating air pressure. Never operate tool above the
specified operating air pressure range.
3. Compressed air only. Use clean, dry regulated compressed air between 70
and 100 PSI. Never use oxygen, carbon dioxide, combustible gases, or any
other bottled gas as a power source for this tool.
4. Avoid possible kickback injury. Hold the tool with both hands during operation
so that your head and body are not injured by possible kickback of the tool.
5. Use care when transporting tool. Disconnect tool from air supply when moving
tool in the workplace. Carry tool only by the handle without drawing the trigger.
6. Keep work area clean. Cluttered areas invite injuries.
7. Observe work area conditions. Do not use machines or power tools in damp
or wet locations. Don’t expose to rain. Keep work area well lighted.
8. Keep children away. Children must never be allowed in the work area. Do not
let them handle machines, tools, or extension cords.
9. 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.
SKU 93900 For technical questions, please call 1-800-444-3353. Page 3
10. Do not force tool. It will do the job better and more safely at the rate for which
it was intended. Do not use inappropriate attachments in an attempt to exceed
the tool capacity.
11. 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. Do not modify this tool and do not use this tool for a
purpose for which it was not intended.
12. Dress properly. Do not wear loose clothing or jewelry as they can be caught in
moving parts. Protective, electrically nonconductive clothes and nonskid footwear
are recommended when working. Wear restrictive hair covering to contain long
hair.
13. Use eye and ear protection. Always wear ANSI-approved impact safety goggles.
Wear a NIOSH-approved dust mask or respirator when working around metal,
wood, and chemical dusts and mists. Wear ear plugs.
14. Do not overreach. Keep proper footing and balance at all times. Do not reach
over or across running machines.
15. Maintain tools with care. Keep tools sharp and clean for better and safer
performance. Follow instructions for lubricating and changing accessories. Inspect
tool periodically and, if damaged, have them repaired by an authorized technician.
The handles must be kept clean, dry, and free from oil and grease at all times.
16. Remove adjusting keys and wrenches. Check that keys and adjusting
wrenches are removed from the tool before operating.
17. Stay alert. Watch what you are doing, use common sense. Do not operate any
tool when you are tired.
18. 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.
19. Maintenance. For your safety, service and maintenance should be performed
regularly by a qualified technician.
20. 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.
21. Do not operate tool if under the influence of alcohol or drugs. Read warning
labels on prescriptions to determine if your judgment or reflexes are impaired
while taking drugs. If there is any doubt, do not operate the tool.
SKU 93900 For technical questions, please call 1-800-444-3353. Page 4
22. Some dust created by power/hand sanding, sawing, grinding, drilling, and other
construction activities, contain chemicals known [to the State of California] to
cause cancer, birth defects or other reproductive harm. Some examples of
these chemicals are:
A) Lead from lead-based paints,
B) Crystalline silica from bricks and cement or other masonry products,
C) Arsenic and chromium from chemically treated lumber.
Your risk from these exposures varies, depending on how often you do this type
of work. To reduce your exposure to these chemicals: work in a well ventilated
area, and work with approved safety equipment, such as those dust masks that
are specially designed to filter out microscopic particles. (California Health &
Safety Code § 25249.5,
et seq.
)
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.
Unpacking
When unpacking, check to make sure that all the parts are included. Refer to the
Parts List and Parts Diagram at the end of this manual. If any parts are missing or
broken, please call Harbor Freight Tools at the number on the cover of this manual as
soon as possible.
Assembly
Air Inlet (56)
Air Connection
1. Attach an air hose (not supplied) to the Air
Inlet (56) fitting.
2. Optionally, for easy connection or removal,
attach an Air Quick-coupler (not supplied)
to the hose and Air Inlet (56) fitting.
3. Retighten all couplings and fittings. See photos on the next page.
Oiler and Filter Connection
Dirt, water, and the lack of pneumatic tool oil are major causes for tool wear. Install
an optional oiler-filter, as illustrated below for better performance.
1. Connect the air tool, air hoses, filter, and oiler to the Compressor Air Outlet as
illustrated below.
The filter and oiler (not supplied) are recommended but not mandatory for operation.
SKU 93900 For technical questions, please call 1-800-444-3353. Page 5
If the filter and oiler are not used, connect the air hose directly to the 1/4 inch,
18 NPT connector located at the Air Inlet (13) fitting. Also, a few drops of
pneumatic tool oil must be added through the air line before each use.
Note: Use pipe thread seal tape on all threaded connections.
Secure Drill Bit
Before each use, insert the Hex Wrench (57) into the Set Screw on the Supporter
(45) and tighten to the flat surface on the shank of the Drill Bit (46).
Operation
Controls and Adjustments
Arm (50)
Drill Bit (46)
Supporter (45)
Adjustment
Wheel (29)
Trigger (12)
Air Inlet (56)
Muffler (54)
Retaining Ring (48)
Lock Nut (47)
Drilling a Spot Weld
1. Push in on the Supporter (45) and verify that it lines up with the top of the Drill
Bit (46).
2. Measure the height of the spot weld to be drilled. Turn the Adjustment Wheel (29)
so that the distance between the top of the Supporter (45) and the top of the Drill
Bit (46) equals the height of the spot weld.
3. Connect the compressor air hose (minimum 3/8” I.D.) to the Air Inlet (56) on the
handle of the Housing (1).
4. Turn the compressor (not supplied) on and set the air compressor pressure
regulator to 90 PSI.
SKU 93900 For technical questions, please call 1-800-444-3353. Page 6
If any air is leaking, turn off the compressor, disconnect the air hose, and repair
the leak. Repeat steps 3 and 4.
5. Push in on the Supporter (45) and place the Drill Bit (46) over the spot weld to
be drilled and release the Supporter; then release Supporter (45).
The spot weld must be within two inches from the edge of the metal where the
spot weld is located. The two inch Arm (50) goes under the metal with the spot
weld.
6. Grip the Air Drill firmly with both hands and press down on the Trigger (12).
Press the Trigger to the first click to operate the drill at low speed so you can
position the bit in place. Press it all the way in to drill.
Caution: If the Air Drill will not turn, or if it stalls while drilling, do not raise the
outlet pressure of the air compressor. Do not continue with attempts to drill
until the problem is resolved.
7. Press down with steady, even pressure. Let the Drill Bit do the drilling. While
drilling, turn the adjustment wheel to draw the Arm (50) and Bit (46) together.
8. When the Supporter (45) will not allow the Drill Bit to continue further, the drilling
is complete.
If part of the spot weld remains, turn the Adjustment Wheel (29) to allow the Drill
Bit to drill deeper, and repeat steps 5 to 8.
9. When finished drilling, turn the compressor off and remove the hose connection
to the Air Drill.
10. Press and hold in the Trigger (12) to release any air remaining in the Air Drill.
Maintenance
1. After each use, wipe the Air Drill with a clean cloth to remove any dirt and
grease buildup.
2. To maintain tool life, always lubricate the air line by adding a few drops of
pneumatic tool oil to the air line before each use. Or, install the automatic
oiler-filter system as illustrated on page 5.
3. Before each use, drain water out of the air compressor tank and condensation
from the air lines. Refer to the Air Compressor Operator’s Manual.
Manual Tool Lubrication
1. Disconnect the Air Drill from the air supply and turn it so the Air Inlet fitting is
facing upward.
2. Hold the Trigger (12) in and place one teaspoon of pneumatic tool oil into the air
inlet (use SAE #10 weight oil if air tool oil is not available). Holding the Trigger
lever in helps circulate the oil in the air motor.
3. Connect the Air Drill to the air supply and cover the Muffler Cover (11) with a
towel. Run for a few seconds. Excess oil with be blown out the Muffler (54).
SKU 93900 For technical questions, please call 1-800-444-3353. Page 7
Replacing the Drill Bit
1. Disconnect the air line from the Air Drill.
2. Press and hold the Trigger (12) to release any remaining air.
3. Unscrew the Lock Nut (47) by turning it counterclockwise and slide it up and
over the Arm (50).
4. Grab the Arm (50) and turn it side to side while pulling it up and off the Housing
(1).
5. Using the Hex Wrench (57), loosen the Set Screw in the Supporter (45), then pull
out the Drill Bit (46).
6. Replace the Drill Bit and retighten the Set Screw on the flat surface of the Drill
Bit.
7. Replace the Arm (50).
8. Replace the Lock Nut (47) by turning it clockwise over the Housing (1). Securely
tighten Lock Nut.
Parts List
Item Description Qty Item Description Qty
1 Housing 1 31. Retaining Ring (S22) 1
1. A
Ball (∅ 6.35mm)
1 32. Ball Bearing (R8) 1
2.
Pin (∅ 3x27.8)
1 33. Gear Cage 2
5. O-ring (3.9x2.25x2) 1 34. Gear 2
7.
O-ring (∅ 3.5x1.5)
1 35.
Pin (∅ 3x17.8)
2
8. Valve Stem 1 36. Washer 1
9. O-ring (P14) 3 37. Ball Bearing (R6zz) 1
10. Valve Bushing 1 38. Internal Gear 1
11. Spring 1 39. Bit Holder 1
12. Trigger 1 40. Set Screw (M5x5) 1
13. Set Screw (M4x4) 1 41. Set Screw (M4x6) 1
14. Ball Bearing (696zz) 1 42. Housing, Supporting 1
15. Set Screw (M3x12) 1 43. Spring 1
16. Rear End Plate 1 44. Retainer 1
17.
O-ring (∅ 33.05x1.78)
1 45. Supporter 1
18. Rotor Blades 5 46.
Drill Bit (
∅
8)
1
19. Rotor 1 47. Lock Nut 1
20. Cylinder 1 48. Retaining Ring 1
21.
Ball (∅ 5)
1 50. Arm, 2 inch 1
22. Ball Bearing (608zz) 1 51. Screw (M4x8) 1
23. Spring 1 52. O-ring (P18) 1
24. Clamp Nut 1 53. Muffler Nut 1
25. Gear Case 1 54. Muffler 1
26. Gear Housing 1 55. Muffler Retainer 1
27. Spring 2 56. Air Inlet 1
28.
Ball (∅ 4)
2 57. Hex Wrench 1
29. Adjustment Wheel 1 58. O-ring 2
30. Wave Washer (6200) 2
NOTE: Some parts are listed and shown for illustration purposes only and
are not available individually as replacement parts.
SKU 93900 For technical questions, please call 1-800-444-3353. Page 8
®
3491 Mission Oaks Blvd. • P.O. Box 6009 • Camarillo, CA 93011 • (800) 444-3353
LIMITED
2 YEAR 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 two years from the date of purchase. This warranty
does not apply to damage due directly or indirectly to misuse, abuse, negligence or accidentals;
repairs or alterations outside our facilities; 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.
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.
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 DIS-
TRIBUTOR 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 MANUFAC-
TURER AND/OR DISTRIBUTOR EXPRESSLY STATES THAT ALL REPAIRS AND PARTS RE-
PLACEMENTS 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.
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