Central Pneumatic 93680 User manual

AIR BRAD NAILER OIL FREE
18 GAUGE
Model 93680
ASSEMBLY AND OPERATING INSTRUCTIONS
3491 Mission Oaks Blvd., Camarillo, CA 93011
Visit ourWeb site at: http://www.harborfreight.com
Copyright 2005 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, please call 1-800-444-3353.
®
©
TO PREVENT SERIOUS INJURY,
READ AND UNDERSTAND ALL WARNINGS
AND INSTRUCTIONS BEFORE USE.
(Due to continuing improvements, actual product may differ slightly from the product described herein.)

PRODUCT SPECIFICATIONS
SAVE THIS MANUAL
You will need this manual for the safety warnings and precautions, assembly, operating,
inspection, maintenance and cleaning procedures, parts list and assembly diagram. Keep
your invoice with this manual. Write the invoice number on the inside of the front cover.
Keep this 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 power tools in damp
or wet locations. Do not expose to rain. Keep work area well lit. 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 work area. Do not
let them handle machines, tools, extension cords, or air hoses.
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 for
which it was intended. Do not modify this tool, and do not use this tool for a
purpose for which it was not intended.
SKU 93680 For technical questions, please call 1-800-444-3353 PAGE 2
Item Description
Brad Capacity 5/8” to 2”
Brad Gauge 18 Gauge
Magazine Capacity Up to 110 Brads
Operating PSI 50 to 110 PSI
Maximum PSI 110 PSI
Required CFM 4 to 6 SCFM @ 90 PSI
Air Inlet Size ¼”-18 NPT
Inlet Screen 20-Mesh
Accessories 3mm Hex Wrench (Qty. 1) / 4mm Wrench (Qty. 1)
1” Brads (Qty. 1000) / 2” Brads (Qty. 1000)
Additional Features Oil Free Lubrication / 360 Degree Adjustable Exhaust
Single Sequential Trigger Mechanism
Unit Weight 3.15 Pounds

6. Dress properly. Do not wear loose clothing or jewelry as they can be caught in
moving parts. Protective, electrically non-conductive clothes and non-skid
foot-wear are recommended when working. Wear restrictive hair covering to
contain long hair.
7. Do not overreach. Keep proper footing and balance at all times. Do not reach
over or across running machines or air hoses.
8. Use eye and ear protection. Always wear ANSI approved impact safety
goggles and appropriate hearing protection. Wear a full face shield if you are
producing metal filings or wood chips. Wear an ANSI approved dust mask or
respirator when working around metal, wood, and chemical dusts and mists.
Other people in the work area must also wear ANSI approved impact safety
goggles.
9. Maintain tools with care. Keep tools clean for better and safer performance.
Follow instructions for lubricating and changing accessories. Inspect tool cords
and air hoses periodically and, if damaged, have them repaired by an authorized
technician. The handle must be kept clean, dry, and free from oil and grease at
all times. Do not operate a tool if any portion of the tool’s operating controls are
inoperable, disconnected, altered, or not working properly.
10. Disconnect air hose and release any built-up air pressure. Never service the
Nailer, clear jams, or disassemble with the air hose attached. Always release
any built-up air even after disconnecting hose. Disconnect the Nailer when not
in use.
11. Remove adjusting wrenches. Check that adjusting wrenches are removed
from the tool or machine work surface before attaching to an air source.
12. Avoid unintential starting. Be sure the trigger is in the OFF position when not
in use and before plugging in. Do not carry any tool with your finger on the
trigger, whether it is attached to an air source or not. Do not point the tool towards
yourself or anyone whether it contains staples or not.
13. Stay alert. Watch what you are doing. Use common sense. Do not operate any
tool when you are tired.
14. 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 the trigger does not
operate properly.
SKU 93680 For technical questions, please call 1-800-444-3353 PAGE 3

SKU 93680 For technical questions, please call 1-800-444-3353 PAGE 4
15. Guard against electric shock. Prevent body contact with grounded surfaces
such as pipes, radiators, ranges, and refrigerator enclosures.
16. Replacement parts and accessories. This product is to be repaired and
serviced only by a qualified technician. When this product is serviced, only
identical replacement parts should be used. 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.
17. Do not operate tool if under the influence of alcohol or drugs. Read warning
labels if taking prescription medicine to determine if your judgement or reflexes
are impaired while taking drugs. If there is any doubt, do not operate the tool.
18. Use proper size and type extension cord. If an extension cord is required, it
must be of the proper size and type to supply the correct current to the
compressor without heating up. Otherwise, the extension cord could melt and
catch fire, or cause electrical damage to the tool. Check your air compressor’s
manual for the appropriate size cord. It is also possible that the use of an
extension cord may cause your circuit breaker to trip or your panel fuse to break.
If this happens, either use the compressor without an extension cord or find a
larger amperage circuit to use.
19. Maintenance. The maintenance outlined in the “Maintenance” section should be
performed regularly. For your safety, this product should be serviced or repaired
regularly only by a qualified technician.
20. Compressed air only. Use clean, dry, regulated, compressed air at between 50
and 110 PSI. Never use oxygen, carbon dioxide, combustible gases, or any
other bottled gases a power source for this tool.
21. Do not load brads with the trigger or safety depressed. Unintentional firing
may occur. Do not load brads when the air hose is connected to the tool. Always
assume the tool contains brads.
22. Disconnect air supply before loading the Nailer. Before reloading (or making
any adjustments to) the Nailer, make sure the compressed air is disconnected.
23. Fire brads into an appropriate work surface only. Do not attempt to fire
brads into surfaces too hard to penetrate. Do not double-fire on the same
spot. Do not drive brads on top of other brads, or at too steep an angle. Brads
can ricochet, causing personal injury. Never fire the Nailer into the air, or point it
toward yourself or another person. Always wear ANSI approved impact safety
goggles during use, maintenance, and reloading.
24. Do not fire brads too close to the edge of a workpiece. They may split the

25. Take caution, as some woods contain preservatives such as copper
chromium arsenate (CCA) which can be toxic. When nailing these materials
extra care should be taken to avoid inhalation and minimize skin contact.
WARNING: Some dust created by power 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:
* Lead from lead-based paints,
* Crystalline silica from bricks, cement, and other masonry products,
* Arsenic and chromium from chemically treated lumber.
(California Health & Safety Code 25249.5, et seq.)
26. Stay within air pressure capacity. Never operate the Nailer above 110 PSI.
27. Hold tool away from head and body. During operation the Nailer may kick
back, causing injury.
28. Transport Nailer safely. Always disconnect air supply when moving the tool in
the workplace. Carry the tool by the handle to avoid contact with the trigger.
29. Avoid working alone. If an accident happens, an assistant can bring help.
30. Note: Performance of the compressor (if powered by line voltage) may vary
depending on variations in local line voltage. Extension cord usage may also
affect the tool performance.
31. 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 accessories listed on page 11 are
included, and the product is intact and undamaged. If any parts are missing or broken,
please call Harbor Freight Tools at the number shown on the cover of this manual as
soon as possible.
SKU 93680 For technical questions, please call 1-800-444-3353 PAGE 5
workpiece and fly free, causing personal injury.

TESTING THE SINGLE SEQUENTIAL SAFETY TRIP MECHANISM
WARNING: Even though the Nailer should be empty during this
procedure, ALWAYS point the Nailer at a piece of scrap wood when testing.
1. Make sure the tool is disconnected from its air supply.
2. Completely empty the Magazine Assembly (82) of Brads.
3. Make sure the Trigger (42) and Driver Guide (54) move freely, without sticking.
4. The Nailer should not fire if the Driver Guide (54) is not depressed against the
workpiece.
SKU 93680 For technical questions, please call 1-800-444-3353 PAGE 6
OPERATION
For best service, you should incorporate a regulator and in-line filter as shown in
the diagram below. Hoses, couplers, regulators, and filters are all available at
Harbor Freight Tools.
FILTER
REGULATOR
QUICK
COUPLER
QUICK
CONNECTOR
QUICK
COUPLER
QUICK
CONNECTOR
DRIVER GUIDE (54)
TRIGGER
(42)
MAGAZINE ASSY. (82)
QUICK CONNECTOR (48)

5. Connect the air supply to the tool at the Quick Connector (48). Set the regulator
at the recommended 50 to 110 operating PSI. Do not exceed the maximum
110 PSI.
6. Test the tool by depressing the Driver Guide (54) against the workpiece without
pulling the Trigger (42). The tool must not cycle (fire). If it cycles (fires), stop
immediately and have it repaired by a qualified service technician.
7. Hold the tool away or off the workpiece. The Driver Guide (54) of the tool should
return to its original position. Squeeze the Trigger (42). The tool should not
cycle (fire). If the tool cycles (fires), stop immediately and have it repaired by a
qualified service technician.
8. Depress the Driver Guide (54) against the workpiece and squeeze the Trigger
(42). The tool must cycle (fire) only once. Release the Trigger and squeeze it
again. The tool must cycle (fire) only once. With the Trigger held, carefully lift
the Nailer and press it against the workpiece again. The tool must not cycle
(fire). If it fails to perform in the manner explained in bold, have it repaired by a
qualified service technician.
LOADING BRADS
WARNING: Always wear ANSI approved impact safety goggles when
reloading or performing any other maintenance on this tool. Other people in
the work area must also wear ANSI approved impact safety goggles.
1. Depress the Lock Lever (63) to release the Magazine Assembly (82) and pull the
Magazine out fully.
2. Place a full clip of the desired size Brads (5/8” to 2”) in the Magazine Assembly
(82). Up to 110 Brads may be loaded in the Magazine.
SKU 93680 For technical questions, please call 1-800-444-3353 PAGE 7
MAGAZINE ASSY.
(82)
LOCK LEVER
(63)

SKU 93680 For technical questions, please call 1-800-444-3353 PAGE 8
3. Push the Magazine Assembly (82) back into the Nailer and secure it with the
Lock Lever (63).
OPERATING THE NAILER
1. Attach the Nailer to the air supply at the Quick Connector (48). Start your
compressor and check the pressure, making sure it is set at the recommended 50-
110 PSI. Do not exceed the maximum 110 PSI.
2. Rotate the Exhaust Valve Collar (1) so that the exhaust air blast will be directed
away from the operator.
WARNING: Always keep hands away from the workpiece when firing.
3. To fire, place the Driver Guide (54) of the Nailer on the workpiece. The Nailer
should not fire if the Driver Guide is not depressed. Once depressed, gently and
briefly squeeze the Trigger (42) once; one Brad will be fired.
4. Do not press the Driver Guide (54) against the workpiece with extra force. Allow
the tool to do the work. Always allow the tool to recoil off the work surface.
5. When finished using the Nailer, always disconnect the tool from its air supply.
Empty the Magazine Assembly (82) completely of Brads. Attempt to fire the
Nailer into a piece of scrap wood to ensure it is disconnected and is incapable of
firing any Brads.
6. Make sure to store the Nailer in a clean, dry, safe location out of reach of children.
DRIVER GUIDE (54)
MAGAZINE ASSY. (82)
TRIGGER
(42)
QUICK CONNECTOR (48)
EXHAUST VALVE COLLAR (1)
LOCK LEVER
(63)

SKU 93680 For technical questions, please call 1-800-444-3353 PAGE 9
Note: Always wear ANSI approved impact safety goggles.
Anytime any maintenance or repairs are done (including clearing jams), FIRST:
1. Disconnect the Nailer from its air supply.
2. Empty the Magazine Assembly (82) completely.
3. Attempt to fire the Nailer into a piece of scrap wood to ensure that it is
disconnected and is incapable of firing any Brads.
4. Always leave the Magazine Assembly (82) open during maintenance. The
Magazine is spring loaded, and may cause parts or a Brad to fly out of the Nailer.
CLEARING JAMS
1. Occasionally, a Brad may become jammed in the firing mechanism of the
Nailer, making the tool inoperable. While wearing ANSI approved impact safety
goggles, remove the jammed Brad, disconnect the Nailer from its air supply.
Empty the Magazine Assembly (82) completely of Brads. Attempt to fire the Nailer
into a piece of scrap wood to ensure it is disconnected and is incapable of firing
any Brads.
2. Unscrew and remove the three Screws (60) that hold the Driver Guide Cover
(57) in place. Then, remove the Driver Guide Cover. This allows access to the
Driver Guide (54) where a Brad will usually jam.
3. Use a pair of needle nose pliers to remove the jammed Brad. Then replace the
Driver Guide Cover (57), making sure to tighten the three Screws (60). Also,
make sure the Driver Guide (54) moves freely.
4. Reload the Nailer with Brads. Then, reconnect the air supply hose to the tool.
5. Press the Driver Guide (54) against a piece of scrap wood, and test fire the
Nailer several times while checking for proper operation. If the Nailer is properly
firing, you may continue using the tool. If the tool fails to perform properly,
immediately discontinue use and have the tool repaired by a qualified service
technician.
6. When finished working, disconnect the air supply. Remove the Brads. Then,
store the Nailer in a clean, dry, safe location out of reach of children.
Note: Always wear ANSI approved impact safety goggles.
Anytime any maintenance or repairs are done, FIRST:
1. Disconnect the Nailer from its air supply.
2. Empty the Magazine Assembly (82) completely.
3. Attempt to fire the Nailer into a piece of scrap wood to ensure that it is
disconnected and is incapable of firing any Brads.
4. Always leave the Magazine Assembly (82) open during maintenance. The
Magazine is spring loaded, and may cause parts or a Brad to fly out of the Nailer.

SKU 93680 For technical questions, please call 1-800-444-3353 PAGE 10
INSPECTION, MAINTENANCE, AND CLEANING
1. Inspect the air supply Screen that is located in the Inlet Plug (47) before each
use, and clean or replace as necessary. Dirt and water in the air supply Screen
are major causes of pneumatic tool wear. Use a filter in the compressed air
system for better performance and longer tool life. The filter must have adequate
flow capacity for the specific application.
2. Clean the external parts of the Nailer with a clean cloth and mild detergent or
non-flammable solvent. Then, dry.
3. Store the tool in a clean, dry, safe location out of reach of children.
4. CAUTION: All maintenance, service, or repairs not listed in this manual
are only to be attempted by a qualified service technician.
TROUBLESHOOTING
Problem Possible Solution
Air leak near top of tool. 1. Tighten all screws on the cylinder cap.
2. Have a qualified service technician install a head valve
piston set.
Tool does not work. 1. Make sure compressor regulator is set between 50 to
110 PSI.
2. Check all air connections for leaks.
3. Make sure to fully depress the Driver Guide on the
workpiece when attempting to fire a nail.
4. Check for nail jams. Clear the jam if necessary.
5. Have a qualified service technician check out the tool.
Sluggish operation. 1. Make sure compressor regulator is set between 50 to
110 PSI.
2. Check all air connections for leaks.
3. Have a qualified service technician install a head valve
piston set.
Air leak near bottom of tool. 1. Tighten all screws.
2. Have a qualified service technician replace the bumper or
head valve piston set.
Poor return after firing tool. 1. Have a qualified service technician clean the interior of
the tool and/or replace the bumper or head valve piston
set.
Weak driving force. 1. Make sure compressor regulator is set between 50 to
110 PSI.
2. Check all air connections for leaks.
3. Have a qualified service technician clean the interior of
the tool and/or install a head valve piston set.
Poor feed. 1. Have a qualified service technician clean the interior of
the tool and/or lubricate the magazine and install a new
magazine spring.
Tool jamming too often. 1. Have a qualified service technician clean the interior of
the tool and/or lubricate the magazine and install a new
magazine spring.
Other problems. 1. Have a qualified service technician check out the tool.