Harbor Freight Tools Central Pneumatic Professional 90437 User manual

NAILER
2”TO 3-9/16” SIZE COILED FASTENERS
Model 90437
ASSEMBLY AND OPERATING INSTRUCTIONS
3491 Mission Oaks Blvd., Camarillo, CA 93011
Visit our Web site at http//www.harborfreight.com
Copyright 2003 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.
®
®

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 as-
sembly 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.
GENERAL SAFETY WARNINGS AND PRECAUTIONS
1. KEEP WORK AREA CLEAN AND DRY. Cluttered, damp, or wet work areas
invite injuries.
2. KEEP CHILDREN AWAY FROMWORK AREA. Do not allow children to handle
this product.
SKU 90437 PAGE 2
3. STORE IDLE EQUIPMENT. When not in use, tools and equipment should be
stored in a dry location to inhibit rust. Always lock up tools and equipment, and
keep out of reach of children.
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4. DO NOT USE THIS PRODUCT IF UNDERTHE INFLUENCE OF ALCOHOL OR
DRUGS. Read warning labels on prescriptions to determine if your judgement or
reflexes are impaired while taking drugs. If there is any doubt, do not attempt to
use this product.
5. USE EYE PROTECTION. The operator of Nailer, and all other people in the
work area, should wear ANSI approved safety impact eye goggles when this tool
is being used. ANSI approved safety impact eye goggles are available from
Harbor Freight Tools.
6. DRESS SAFELY. Do not wear loose clothing or jewelry, as they can become
caught in moving parts. Wear a protective hair covering to prevent long hair from
becoming caught in moving parts. If wearing a long-sleeve shirt, roll sleeves up
above elbows.
7. DO NOT OVERREACH. Keep proper footing and balance at all times to prevent
tripping, falling, back injury, etc.
8. INDUSTRIAL APPLICATIONS MUST FOLLOW OSHA REQUIREMENTS.
9. STAY ALERT. Watch what you are doing at all times. Use common sense. Do
not use this product when you are tired or distracted from the job at hand.
10. CHECK FOR DAMAGED PARTS. Before using this product, carefully check that
it will operate properly and perform its intended function. Check for damaged
parts and any other conditions that may affect the operation of this product.
Replace or repair damaged or worn parts immediately.
11. REPLACEMENT PARTS AND ACCESSORIES: When servicing, use only identi-
cal replacement parts. Only use accessories intended for use with this product.
Approved accessories are available from Harbor Freight Tools.
12. MAINTAINTHIS PRODUCT WITH CARE. Keep this product clean and dry for
better and safer performance.
13. MAINTENANCE: For your safety, service and maintenance should be performed
regularly by a qualified technician.
14. USE THE RIGHT TOOL FOR THE JOB. Do not attempt to force small equip-
ment to do the work of larger industrial equipment. There are certain applications
for which this equipment was designed. It will do the job better and more safely
at the capacity for which it was intended. Do not modify this equipment, and do
not use this equipment for a purpose for which it was not intended.
15. WARNING! The warnings, precautions, and instructions discussed in this
SKU 90437 PAGE 3

SPECIFIC PRODUCT WARNINGS AND PRECAUTIONS
1. Important consumer information: This Nailer is equipped with a contact trip
Trigger. This Trigger mechanism is designed primarily for high volume work
where exact placement of the nail is not critical. By holding the Trigger, the
Nailer will fire each time the nosepiece contacts the wood. A characteristic of
this design is the tendency to “double fire” if used to shoot one Nail at a time.
This can be caused by the recoil produced and lingering finger pressure on the
Trigger. To avoid this occurrence, hold the Nailer firmly against the wood and
give the Trigger one quick squeeze. A single shot Nailer, equipped with a se-
quential trip Trigger, may be considered if high volume, rapid nailing is not re-
quired. Failure to understand its operating characteristics, or careless use, can
result in property damage and/or serious personal injury.
2. Maintain a safe working environment. Keep the work area well lit. Make sure
there is adequate surrounding workspace. Always keep the work area free of
obstructions, grease, oil, trash, and other debris.
3. Maintain labels and nameplates on the Nailer. These carry important
information. If unreadable or missing, contact Harbor Freight Tools for a replace-
ment.
4. Use only clean, dry, regulated, compressed air at between 65 to 100 PSI.
Never use oxygen, carbon dioxide, combustible gases, or any other bottled gas
as a power source for this tool.
5. When connecting to the air supply: Prior to each use, if an automatic oiler is
not used, add two drops of Air Tool Oil (part #93) into the Air Plug (part #92) of
the Nailer. Attach the air compressor hose to the Air Plug. Turn on the air com-
pressor, and set the regulator to the recommended 65 to 100 PSI for this tool.
(See Figure A.)
SKU 90437 PAGE 4
manual cannot cover all possible conditions and situations that may occur. The
operator must understand that common sense and caution are factors, which
cannot be built into this product, but must be supplied by the operator.
TO
NAILER
FIGURE A
AIR REGULATOR
TO
AIR
COMPRESSOR
65 - 100
PSI

6. Connect the air supply hose to the Nailer before loading the nails to pre-
vent a nail from being accidentally fired during connection. The Nailer’s
driving mechanism may cycle when the tool is connected to the air supply hose.
When not in use, remove all nails from the Lower Nail Housing (part #75) of the
Nailer.
7. To prevent accidental firing, do not load nails with theTrigger (part #54) or
Safety Guide (part #41) depressed.
8. Remove your finger from theTrigger (part #54) when not driving nails.
Never carry the tool with your finger on the Trigger. The tool will fire a nail if the
Safety Guide (part #41) is accidentally bumped while the Trigger is depressed.
9. Always assume the Nailer contains nails. Keep the tool pointed away from
yourself and others at all times.
10. Never use the Nailer if theTrigger (part #54), Safety Guide (part #41), or
Trigger Spring (part #53) is damaged. Do not alter or remove the Safety
Guide, Trigger, or Trigger Spring. Make daily inspections for free movement of
the Trigger and Safety mechanism.
11. Grip the Nailer firmly with both hands to maintain control, while allowing
the tool to slightly recoil away from the workpiece as a nail is driven.
12. Do not drive nails on top of other nails, or with the tool at too steep an
angle. The nails can ricochet, causing personal injury.
13. Do not drive nails close to the edge of a workpiece. The workpiece is likely to
split, allowing the nail to fly free or ricochet and cause personal injury.
14. Always keep hands and feet away from nose of the Nailer.
15. Make sure all adjusting Wrenches (part #96) are removed from the Nailer
before using.
16. Only use an air supply hose that is rated for a minimum working pressure
of 150 PSI or greater.
17. Always disconnect the Nailer from its air supply hose before performing
inspection or maintenance on the tool, clearing a jammed nail, leaving the
work area, moving the tool to another location, or handing the tool to an
other person.
18. After the air compressor hose is disconnected (when work is completed)
avoid accidental firing by squeezing the trigger and impacting the nose of
the tool on a solid surface to expel any remaining compressed air.
SKU 90437 PAGE 5

UNPACKING
When unpacking, check to make sure all the parts shown on the Parts List (page 10) are
included. 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.
ASSEMBLY AND OPERATING INSTRUCTIONS
NOTE: For additional references to the parts mentioned in the following pages, refer to
the Assembly Diagram (page 11).
To AttachThe Air Coupler Plug:
1. With the air compressor turned off, the Nailer requires the attachment of a
1/4”-18 NPT Air Coupler Plug (part #97). To do so, wrap the threaded portion of
the Coupler Plug with about 3” of pipe thread seal tape (not included). Then,
wrench tighten the Coupler Plug into the Air Plug (part #92). (See Figure B.)
COUPLER
PLUG
(#97)
FIGURE B
AIR PLUG
(#92)
Nail Specifications:
1. Use only the following nail sizes. The nails may be screw, ring, and smooth
types. (See Figure C.)
0.27”
2”
0.113”
0.27”
3-9/16”
0.131”
0.75”0.75”
15 - 18
00
0.322”
FIGURE C
SKU 90437 PAGE 6

SKU 90437 PAGE 7
To Prepare The Nailer Before Driving:
1. CAUTION! Keep the Nailer pointed away from yourself and others at all
times.
2. Always connect the Nailer to its air supply hose before loading nails.
(See Figure D.)
3. Do not load nails withTrigger (part #54) or Safety Guide (part #41) de-
pressed. (See Figure D.)
4. Depress the Handle (part #78) and open the Plate (part #68). (See Figure D.)
HANDLE
(#78)
PLATE
(#68)
AIR
SUPPLY
HOSE
(NOT INCLUDED)
LOWER
NAIL
HOUSING
(#75)
ADJUSTING
NUT
(#86)
5. Turn the Adjusting Nut (part #86) to adjust the Lower Nail Housing (part #75)
according to the nail length being used. The highest position is used for 2” long
nails. The center position is used for 2-3/16”, 2-3/8”, 2-9/16”, 2-3/4”, 2-31/32”,
3-5/32”, and 3-11/32” long nails. The lowest position is used for 3-9/16” long
nails. (See Figure D.)
6. Rotate the Lower Nail Housing (part #75) to the side of the Nailer’s body. Re-
move the retainer from the coil of nails. Place the coil of nails into the Lower Nail
Housing and reset the Lower Nail Housing to its original position. Pull the first
nail out, and position the second nail on the Feed Hook (part #30).
(See Figure D.)
7. Close and lock the Plate (part #68) in place. (See Figure D.)
8. Adjust the directional Exhaust Cover (part #4) so that the exhaust air blast will
FIGURE D
FEED HOOK
(#30)
EXHAUST COVER (#4)
TRIGGER
(#54)

be directed away from the operator. (See Figure D.)
To Operate The Nailer:
1. There are two ways to drive nails with the Nailer:
2. The first way is to place the nose of the Nailer on the workpiece surface. Lightly
push the tool toward the workpiece surface until the Safety Guide (part #41) is
depressed. Then, depress the Trigger (part #54) to drive a nail. This “trigger fire”
method provides the most accurate nail placement.
3. The second way is to depress the Trigger (part #54). Then, repeatedly impact
the Safety Guide (part #41) into the workpiece surface so the tool can repeatedly
drive the nails. The tool will drive one nail each time the Safety Guide is im-
pacted one time. This “bottom fire” method allows very fast, repetitive, nail place-
ment.
To Clear A Jammed Nail:
1. CAUTION! To avoid accidental firing, disconnect the Nailer from its air
supply hose. Squeeze theTrigger (part #54) and impact the nose of the
tool on a solid surface to expell any remaining compressed air.
2. Depress the Handle (part #78) and open the Plate (part #68). (See Figure D.)
3. Rotate the Lower Nail Housing (part #75) to the side of the Nailer’s body. Re-
move the coil of nails. (See Figure D.)
4. Use a slender, soft steel rod (not included) to push the Safety Guide (part #41) to
its uppermost position. Use needle nose pliers (not included) to remove the
jammed nail. Then, follow the instructions in the “To Prepare The Nailer Before
Driving” section to resume tool operation. (See Figure D.)
INSPECTION, MAINTENANCE, AND CLEANING
1. CAUTION! Always disconnect the Nailer from its air supply hose before
performing any inspection, maintenance, or cleaning procedures.
2. Before each use, inspect the general condition of the Nailer. Check for mis-
alignment or binding of moving parts, bent, cracked or broken parts, and any
other condition that may affect its safe operation. If abnormal noise or vibration
occurs, have the problem corrected before further use.
Do not use damaged equipment.
3. If the Nailer is used without an in-line oiler (not included), place five or six
SKU 90437 PAGE 8

SKU 90437 PAGE 9
PLEASE READ THE FOLLOWING CAREFULLY
THEMANUFACTURER AND/OR DISTRIBUTORHASPROVIDEDTHEPARTS LISTAND
ASSEMBLY DIAGRAM IN THIS MANUAL AS A REFERENCE TOOL ONLY. NEITHER
THE MANUFACTURER OR DISTRIBUTOR MAKES ANY REPRESENTATION ORWAR-
RANTY OF ANY KINDTOTHE BUYERTHAT HE OR SHE IS QUALIFIEDTO MAKE ANY
REPAIRS TO THE PRODUCT, ORTHAT HE OR SHE IS QUALIFIEDTO REPLACE ANY
PARTS OF THE PRODUCT. IN FACT, THE MANUFACTUER 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.
drops of air tool oil into the air inlet of the tool at the beginning of each work day.
4. To clean, blow the Nailer with compressed air. Then, use a non-flammable
cleaning solution to wipe the exterior of the tool. Do not soak the tool with clean-
ing solutions. Such solutions can damage the tool’s internal parts.

PARTS LIST
SKU 90437 PAGE 10
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SKU 90437 PAGE 11
ASSEMBLY DIAGRAM
NOTE: Some parts are listed and shown for illustration purposes only, and are not available individually
as replacement parts.
81
80
8283
84
85
86
87
457
79
78
77 76
75
74
73 72
71
70
69
68
67
66
65
64
63
62
61
62
60
59
58
57
56
55
54
39 40
54 53 52 51 49 50 49 48 47
46
45
88
89
90 91
92
44
43
42
41
39
40
27
28
29 30
31
32
33
34
35
36
37
38
26
25
24
23
22
21
20
19
18
17
16
15
14
13
12
11 10
98
7
6
5
4
32
1
NOTE: Parts #92 through #97 not shown.