Harbor Freight Tools 91044 User Manual

®

6 IN 1 AIR FRAMING NAILER

Model 91044

ASSEMBLY and OPERATING

INSTRUCTIONS

3491 Mission Oaks Blvd., Camarillo, CA 93011

Visit our Web site at http://www.harborfreight.com

TO PREVENT SERIOUS INJURY,

READ AND UNDERSTAND ALL WARNINGS

AND INSTRUCTIONS BEFORE USE.

Copyright© 2004 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

Revised 07/04

Specifications

Air Inlet 1/4” NPT
Recommended Air Pressure 70-125 PSI *
Maximum Air Pressure 125 PSI
Nail Type Approx. 10 Gauge (0.113 & 0.131” Dia.) Clipped or Full Head Nails

2-3/16” - 3-1/2” Length
Safety Feature Full Sequential Actuation
Magazine Capacity 21° - 60 Qty., 28° and 34° - 100 Qty.
Air Consumption 8-12 CFM @ 90 PSI
Includes: 21° Full Head Nails - 50 Qty., 28° Clip Head Nails - 50 Qty.,
34° Clip Head Nails - 80 Qty., Goggles, Wrenches, and Case.

* The air pressure setting must not exceed job site regulations/restrictions. The air
pressure setting must not exceed 90 PSI when being used with work pieces that
have a thickness of less than 1-3/4”.

Save This Manual

You will need the manual for the safety warnings and precautions, assembly instructions,
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. 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. Don’t 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.

6. 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.

7. Use eye and ear protection. Always wear ANSI approved impact safety goggles.

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.

REV 06/05 REV 11/06

Page 2SKU 91044 For technical questions, please call 1-800-444-3353.

8. Do not overreach. Keep proper footing and balance at all times. Do not reach over or across
running machines or air hoses.

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 supply. Disconnect air hose when adding nails, during maintenance, and
when not in use.

11. Remove adjusting keys and wrenches. Check that keys and adjusting wrenches are
removed from the tool or machine work surface before attaching to an air source.

12. Avoid unintentional 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
fasteners 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 any the trigger
does not operate properly.

15. Guard against electric shock. Prevent body contact with grounded surfaces such as pipes,
radiators, ranges, and refrigerator enclosures.

16. 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.

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.

19. Maintenance. For your safety, maintenance should be performed regularly by a qualified
technician.

20. Compressed air only. Never use combustible gas as a power source.

21. Do not load nails with the trigger or safety depressed. Unintentional firing may

occur. Do not load nails when the air hose is connected to the tool. Always assume
that the tool contains fasteners.

Page 3SKU 91044 For technical questions, please call 1-800-444-3353.

22. Fire fasteners into an appropriate work surface only. Do not attempt to fire
fasteners into surfaces too hard to penetrate. Do not drive fasteners on top of other
fasteners, or at too steep of an angle. Fasteners can ricochet causing personal injury.

23. Do not fire fasteners too close to the edge of a workpiece. They may split the
workpiece and fly free, causing personal injury.

24. Disconnect air supply before loading Nailer. Before reloading (or making any
adjustments) to the Nailer make sure that the compressed air is disconnected.

25. Take caution as some woods contain preservatives such as copper chromium
arsenate (CCA) which can be toxic. When stapling or 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 and cement or 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 125 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 and avoid contact with the trigger.

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 tool
performance.

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.

Rev 11/06

Page 4SKU 91044 For technical questions, please call 1-800-444-3353.

Unpacking

When unpacking, check to make sure the parts listed on page 11 are
included. 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.

Operation

1/4” NPT

Nailer

1. You will need to prepare a 1/4” air connector (sold separately) to connect to the air inlet
on the Nailer. First, wrap the 1/4” air connector (not included) with pipe thread seal tape
before threading it into the Air Inlet (90). Connect the 3/8” ID Air Source Hose to the
Nailer.

Note: If you are not using an automatic oiler system, before operation, add a few drops of

Pneumatic Tool Oil to the airline connection. Add a few drops more after each hour of
continual use.

2. Set the air pressure on your compressor to 70 to 125 PSI. Do not exceed the maxi-
mum air pressure of 125 PSI.

3. Check the air connection for leaks. Disconnect the Nailer from the air source hose.

Rev 11/06

Page 5SKU 91044 For technical questions, please call 1-800-444-3353.

Operation

Testing the Full 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 the power supply.

2. Completely empty the Magazine (76) of nails.

3. The Nailer should not fire if the Safety (41) is not depressed against the workpiece.

4. Make sure the Trigger (47) and Safety (41) move freely, without sticking.

5. Connect the air supply to the tool at the Air Inlet (90). Set the regulator at the recom­mended 70 to 125 PSI.

6. Test the tool by depressing the Safety (41) against the workpiece without pulling the
Trigger (47). 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 of the workpiece. The Safety (41) of the tool should return to
its original position. Squeeze the Trigger (47). The tool should not cycle (fire). If the
tool fires, stop immediately and have it repaired by a qualified service technician.

8. Depress the Safety (41) against the workpiece and squeeze the Trigger (47). The tool

must cycle (fire) only once. Release the Trigger and squeeze it again. The tool
must not cycle (fire). 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.

Warning! Disconnect the Nailer from the air compressor whenever load-

ing or servicing.

ALWAYS WEAR ANSI APPROVED IMPACT SAFETY GOGGLES WHEN RE-

LOADING OR DOING ANY OTHER MAINTENANCE ON THIS TOOL.

Other people in the work area must also wear ANSI approved impact
safety goggles.

Loading Nails - See FIGURE 2 on page 7.

1. Slide the Tab (70) back and the Latch (83) will hold it in place.

2. Load a stick of nails into the top slot, making sure the nail heads are facing up.

3. Be Careful. When you pull back on the Latch (83) to release the Tab (70), it will spring
forward with force. Keep your fingers clear when you release the Latch (83) and slide
the Tab (70) forward.

Note: The Nailer may not work if there are only two or three nails left in the tool. If there are

only a few nails remaining, simply load another strip of nails into the Magazine behind
the few remaining nails and the Nailer will be ready for further use.

Rev 11/06

REV 06/05

Page 6SKU 91044 For technical questions, please call 1-800-444-3353.

Operation (continued)

Warning! Disconnect the Nailer from the air compressor
whenever loading or servicing.

Exhaust Cover (4)

Air Inlet (90)

Magazine (76)

FIGURE 1

Trigger (47)

FIGURE 3

FIGURE 2

Tab (70)

Latch (83)

Safety (41)

FIGURE 4

Angle Adjustment Holes

Hex Bolt

21o28

o

o

34

FIGURE 5

o

28

o

o

21

34

Plate (80)

Tab (70)

FIGURE 6

28o/34

Pin in

Position

21

Adjustment Knob (81)

Pin in

B

o

o

/34

o

A

o

28
Position

o

21

REV 04/06

Page 7SKU 91044 For technical questions, please call 1-800-444-3353.

Operation (continued)

Operating the Nailer

Note: The Nailer may not work if there are only 2 or 3 nails left-see Note on page 6, bottom.

1. Set the proper angle of the Nailer for your application (a three step process):

a. Pull back and engage the Tab (70), exposing three adjustment holes. Loosen

the hex bolt and slide it into the appropriate hole (21°, 28°, 34°). Retighten the
hex bolt securely, making sure it fits into the appropriate hole properly. See
FIGURE 3. Gently release the Tab (70).

b. Remove the Adjustment Knob (81). See FIGURE 4. Move the Magazine (76)

so that the desired hole on the Plate (80) lines up with the nut on the Magazine
(76). See FIGURE 5. Replace and tighten the Adjustment Knob (81).

c. Inspect the Pin’s (34) location and compare it to FIGURE 6. If you are driving

21° angle nails the Pin should be in the lower hole (position A). If you are
driving 28° or 34° angle nails the Pin should be in the upper hole (position B).
If the Pin is in the wrong position, pull the Pin (34) out (it is held in place with a
rubber washer), reposition the Guide Plate (35), and reinsert and secure the
Pin (34). Before using the nailer, be sure that the Pin is properly secured.

2. The driving depth of a nail can be adjusted in two ways. First, by increasing or de­creasing air pressure (never to exceed the maximum of 125 PSI). Secondly, by loos­ening the Screw (37) and adjusting the Bracket A (38). We recommend you experi­ment in a scrap piece of material to determine how far to adjust the unit.

3. Attach the Nailer to the air supply at the Air Inlet (90). See FIGURE 1. Start your air
compressor and make sure it is set to between the recommended 70-125 PSI and not
over the maximum 125 PSI.

4. To fire, place the Safety (41) of the Nailer on the workpiece. The Nailer should not fire
if the Safety (41) is not depressed. Once depressed, quickly squeeze the Trigger (47)
once. Do not fire repeatedly; nails could bounce off of one another causing in-
jury. We recommend you practice with a piece of scrap material.

5. The Exhaust Cover (4) may be turned to suit your preference. See FIGURE 1 on page

7.

6. The Rubber Cover (42) provides a non-marring surface. If desired, the Rubber Cover
may be removed to expose the teeth on Safety (41). Doing so provides a nonslip
surface and can improve accuracy.

7. When finished, disconnect the Nailer from the air source.

Rev 11/06

Page 8SKU 91044 For technical questions, please call 1-800-444-3353.

Anytime

any

maintenance or repairs are done (including clearing jams), FIRST:

1. Disconnect the Nailer from the air hose.

2. Empty the Magazine (76) 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 nails.

4. Always leave the Magazine (76) open during maintenance. The Magazine is spring-

loaded and may cause parts or a nail to fly out of the Nailer.

Clearing Jams

1. Disconnect tool from air hose. Always fire the trigger repeatedly to make sure all of the
air is expended from the Nailer.

2. If a nail is jammed in the discharge area, simply remove it with pliers.

3. If a nail is jammed in the magazine, pull the Tab (70)

Figure 7

all the way back to the engaged position. Using a
screwdriver, attempt to release the jammed nail by
probing either or both of the two openings in the
magazine (see photo at right) to release the nail.
Pull out the jammed nail and the remainder of the
nail strip that is still in the magazine.

4. Dispose of the remaining nail strip; it may be bent
or damaged in some other way. Reload the maga­zine with a new nail strip.

Be careful. When you pull back on the Latch (83) to

Probe in these areas with a
screwdriver to release jammed nails.

release the Tab (70), it will spring forward with
force. Keep your fingers clear when you release the Latch (83) and slide the Tab (70)

forward.

If you are unable to clear the nail jam using the method prescribed above, the tool
should be taken to a qualified service technician for proper servicing.

Page 9SKU 91044 For technical questions, please call 1-800-444-3353.

Troubleshooting

Any internal repair should be performed by an authorized service technician.

Symptom

Top of tool or Trigger

(47) leaks air

Sluggish operation, or

will not operate

Bottom of tool leaks air

Frequent Jamming

Note: Contact Harbor Freight Tools for repair/replacement parts.

Cause

Loose Screws,
Worn or damaged O-rings or seals

Inadequate air supply,

Inadequate lubrication,
Worn/damaged O-rings or seals

Loose Screws,
Worn/damaged O-rings, seals.

Incorrect fasteners,
Damaged fasteners,
Magazine (76) or Nose screw loose,
Dirt inside Magazine,
Worn or damaged Driver Unit

Solution

Verify screws are tight,
Check/replace O-rings or seals

Use a compressor that delivers

the proper CFM,
Add air tool oil (not incl.),
Check/replace O-rings or seals

Verify screws are tight,
Check/replace O-rings, seals.

Verify fastener size,
Replace fasteners,
Tighten screws,
Clean Magazine,
Inspect Driver Unit

Maintenance

Disconnect the Nailer from the air source hose before attempting any maintenance.

1. Wipe tool clean with a lint free cloth and inspect it for damage. Do not use the tool if
you find damage. Have it repaired by an authorized service technician.

2. Always test the Full Sequential Safety mechanism before each use (see page 6).

3. Keep all screws tight. Loose screws may damage the tool and cause personal injury.

4. Make sure that Base (29) is clear of all dirt or debris.

Page 10SKU 91044 For technical questions, please call 1-800-444-3353.

Parts List

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.

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NOTE: Some parts are listed and shown for illustration purposes only and are not available
individually as replacement parts.

REV 06/05

Page 11SKU 91044 For technical questions, please call 1-800-444-3353.

Assembly Drawing

REV 06/05

Page 12SKU 91044 For technical questions, please call 1-800-444-3353.