Grizzly H7943/H7944 User manual

COPYRIGHT © NOVEMBER, 2006 BY GRIZZLY INDUSTRIAL, INC.
WARNING: NO PORTION OF THIS MANUAL MAY BE REPRODUCED IN ANY SHAPE
OR FORM WITHOUT THE WRITTEN APPROVAL OF GRIZZLY INDUSTRIAL, INC.
#JC8620 PRINTED IN TAIWAN
MODEL H7943/H7944
INSTRUCTION MANUAL
H7943 21°
FRAMING NAILER
H7944 34°
FRAMING NAILER

Safety Instructions For Pneumatic Tools
1. KEEP ALL SAFETY DEVICES IN
PLACE and in working order.
2. REMOVE ADJUSTING KEYS AND
WRENCHES. Form habit of check-
ing to see that keys and adjusting
wrenches are removed from tool
before operation.
3. KEEP WORK AREA CLEAN.
Cluttered areas and benches invite
accidents.
4. DO NOT USE IN DANGEROUS
ENVIRONMENT. Do not use pneu-
matic tools in damp or wet loca-
tions, or where any flammable or
noxious fumes may exist. Keep
work area well lighted.
5. KEEP CHILDREN AND VISITORS
AWAY. All children and visitors
should be kept at a safe distance
from work area.
6. MAKE WORKSHOP CHILD
PROOF by locking your shop and
shutting off air valves.
7. DO NOT FORCE TOOL. It will do
the job better and safer at the rate
for which it was designed.
8. USE THE RIGHT TOOL. Do not
force tool or attachment to do a job
for which it was not designed.
9. DO NOT USE UNDER THE
INFLUENCE OF DRUGS OR
ALCOHOL.
For Your Own Safety Read Instruction Manual
Before Operating This Equipment
The purpose of safety symbols is to attract your attention to possible hazard-
ous conditions. This manual uses a series of symbols and signal words which
are intended to convey the level of importance of the safety messages. The
progression of symbols is described below. Remember that safety messages by
themselves do not eliminate danger and are not a substitute for proper accident
prevention measures.
Indicates a potentially hazardous situation which, if
not avoided, MAY result in minor or moderate injury.
It may also be used to alert against unsafe practices.
Indicates a potentially hazardous situation which, if
not avoided, COULD result in death or serious injury.
Indicates an imminently hazardous situation which, if
not avoided, WILL result in death or serious injury.
This symbol is used to alert the user to useful infor-
mation about proper operation of the equipment.
SAFETY
NOTICE

H7943 /H7944 Framing Nailer -1-
10. USE PROPER AIR HOSE for the
tool. Make sure your air hose is in
good condition and is long enough to
reach your work without stretching.
11. WEAR PROPER APPAREL. Do not
wear loose clothing, gloves, neck-
ties, rings, bracelets, or other jew-
elry which may get caught in moving
parts. Non-slip footwear is recom-
mended. Wear a protective hair cov-
ering to contain long hair.
12. ALWAYS USE ANSI APPROVED
SAFETY GLASSES. Also use a
face or dust mask if cutting operation
is dusty. Everyday eyeglasses only
have impact resistant lenses, they
are NOT safety glasses.
13. ALWAYS WEAR ANSI APPROVED
HEARING PROTECTION.
14. SECURE WORK. Use clamps or a
vise to hold work when practical. It is
safer than using your hand and frees
both hands to operate tool.
15. MAINTAIN TOOLS WITH CARE.
Keep tools lubricated and clean
for best and safest performance.
Follow instructions for lubricating
and changing accessories.
16. REDUCE THE RISK OF
UNINTENTIONAL STARTING. Do
not carry tool with hand on trig-
ger and always disconnect from air
when not in use.
17. DISCONNECT TOOLS before ser-
vicing, changing accessories, or
moving to another location.
18. DO NOT OVERREACH. Keep
proper footing and balance at all
times.
19. USE THE RECOMMENDED
ACCESSORIES. Consult owner’s
manual for recommended acces-
sories. The use of improper acces-
sories may cause risk of injury.
20. CHECK FOR DAMAGED PARTS
BEFORE USING. Check for bind-
ing and alignment of parts, broken
parts, part mounting, loose bolts,
and any other conditions that may
affect machine operation. Repair or
replace damaged parts.
21. NEVER LEAVE UNATTENDED
TOOL CONNECTED TO AIR.
Disconnect the air hose and do not
leave tool until it is relieved of any
built up pressure.
22. NEVER ALLOW UNTRAINED
USERS TO USE THIS TOOL
WHILE UNSUPERVISED.
23. IF YOU ARE UNSURE OF THE
INTENDED OPERATION, STOP
USING THE TOOL. Seek formal
training or research books or maga-
zines that specialize in pneumatic
tools.
Safety Instructions For Pneumatic Tools

H7943 /H7944 Framing Nailer
-2-
1. HAND INJURIES: Do not place
your hands near the nail point
of entry. A nail can deflect and
tear through the surface of the
workpiece, puncturing your hand
or fingers.
2. COMBUSTIBLE GASES: Never
connect the nailer to pressur-
ized oxygen or other combustible
gases as a power source. Only
use filtered, lubricated, and regu-
lated compressed air.
3. SAFE HANDLING: Never point
the nailer at others! Do not keep
the trigger pulled when loading
fasteners, carrying, or holding tool.
Carry the nailer only by the handle,
never by any other part. Do not
carry the nailer by the air hose.
Disconnect the nailer from the air
hose when going up and down
ladders.
4. HOSE: Make sure your air hose
is designed for the tool in use,
is in good condition, and is long
enough to reach your work with-
out stretching. However, an overly
long air hose in the work area may
be a tripping hazard.
Additional Safety Instructions for Nailers
5. COMPRESSED AIR RATING: Do
not connect the nailer to compressed
air that exceeds 120 PSI.
6. CHECK VALVE: Do not use a check
valve or any other fitting that allows
air to remain in the tool.
7. CLEANING: Never use gasoline or
other flammable liquids to clean the
nailer; vapors in the nailer will ignite
by a spark and cause it to explode.
8. OPERATING QUESTIONS: If you
are not sure about the intended
operation, stop using the nailer.
Seek formal training or research
sources that specialize in pneumatic
tools.
9. MAINTENANCE: Always disconnect
air from the nailer when servicing or
installing nails. During maintenance,
a nailer connected to air may fire
accidentally, causing serious per-
sonal injury.

H7943 /H7944 Framing Nailer -3-
Operating this nailer can propel
objects into the air, causing imme-
diate eye damage. To protect your-
self, always wear American National
Standards Institute (ANSI) approved
safety glasses or goggles when oper-
ating this equipment. In addition, this
nailer discharges at up to 90 deci-
bels. To protect your hearing, always
wear ANSI approved ear protection
when operating this nailer.
Never point this nailer at yourself or
another person! Always pay attention
to the direction this nailer is pointed.
Use this tool with respect and caution
to lessen the possibility of operator or
bystander injury. Ignoring this warning
may result in serious personal injury.
Nailer accidents routinely happen
while moving the gun to another loca-
tion, such as up ladders, to another
room, or even another job site. Always
disconnect the gun immediately after
use and never transport the gun while
connected to the air—even if the air
compressor is disconnected from its
power source!
No list of safety guidelines can be
complete. Every shop environment is
different. Always consider safety first,
as it applies to your individual working
conditions. Use this and other tools
with caution and respect. Failure to
do so could result in serious personal
injury, damage to equipment or poor
work results.
Read the manual before operation.
Become familiar with these nailers,
their safety instructions, and opera-
tion before beginning any work.
Serious personal injury may result if
safety or operational information is
not understood or followed.

H7943 /H7944 Framing Nailer
-4-
INTRODUCTION
If you have any comments regarding this
manual, please write to us at the following
address:
Grizzly Industrial, Inc.
C/O Technical Documentation Manager
P.O. Box 2069
Bellingham, WA 98227-2069
Email: [email protected]
Most importantly, we stand behind our
tools. If you have any service questions or
parts requests, please call or write us at
the location listed below.
Grizzly Industrial, Inc.
1203 Lycoming Mall Circle
Muncy, PA 17756
Phone: [phone]
Fax: [phone]
E-Mail: [email protected]
Web Site: http://www.grizzly.com
We are proud to offer the Grizzly Model
H7943/H7944 framing nailer. This nailer
is part of a growing Grizzly family of fine
pneumatic tools. When used according to
the guidelines set forth in this manual, you
can expect years of trouble-free, enjoy-
able operation and proof of Grizzly’s com-
mitment to customer satisfaction.
The Model H7943/H7944 features a 360°
exhaust port and a comfort grip rubber
handle. It is also economical in air con-
sumption, able to fire 10-15 nails/second
when powered by a 3/4" HP compressor.
The specifications, details, and photo-
graphs in this manual represent Model
H7943/H7944 as supplied when this
manual was prepared. However, owing
to Grizzly’s policy of continuous improve-
ment, changes may be made at any time
with no obligation on the part of Grizzly.
Foreword
Contact Info
Nail Type ..................................Roundhead
Nail Angle ..............................................21°
Nail Diameter .......................0.113" - 0.161"
Nail Length .........................................2"–4"
Magazine Capacity ........................ 66 Nails
Air Inlet ...........................................3/8" NPT
Weight ...........................................7.75 lbs.
Operating Pressure ................. 70–120 PSI
Nail Type ...............................Clipped Head
Nail Angle ..............................................34°
Nail Diameter .......................0.113" - 0.161"
Nail Length .........................................2"–4"
Magazine Capacity ........................ 90 Nails
Air Inlet ...........................................3/8" NPT
Weight ...........................................7.85 lbs.
Operating Pressure ................. 70–120 PSI
Model H7943
Specifications
Model H7944
Specifications

H7943 /H7944 Framing Nailer -5-
SETUP
Figure 1. Model H7943 /H7944 inventory.
Unpacking
Your Model H7943/H7944 left our ware-
house in a carefully packed box. If you dis-
cover the nailer is damaged after you have
signed for delivery, please immediately
call Customer Service at [phone]
for advice.
Save the containers and all packing mate-
rials for possible inspection by the car-
rier or its agent. Otherwise, filing a freight
claim can be difficult.
When you are completely satisfied with
the condition of the shipment, you should
inventory the equipment.
Inventory
After you open the nailer box, you should
find the following.
Model H7943/H7944 Inventory (Figure 1)
A. Nailer .................................................. 1
B. Nailer Case ........................................ 1
C. Extra Piston O-Rings ......................... 2
D. Pneumatic Tool Oil ............................ 1
E. Hex Wrenches 4, 5, 8mm ......... 1 Each
B
C
D
A
E

H7943 /H7944 Framing Nailer
-6-
Compressed Air
System
Model H7943/H7944 is designed to be
operated at 70–120 PSI using clean,
dry, regulated, compressed air. DO NOT
exceed the 120 PSI maximum operat-
ing pressure for your model.
Before using your new nailer, set the air
pressure on your regulator to the mini-
mum PSI for your model.
An in-line filter/lubricator/regulator unit,
depicted in Figure 2, can be installed and
should be located as close to the nailer
as possible.
This filter/lubricator/regulator unit will pro-
tect your tool from damaging water build-
up, allow you to adjust and maintain con-
stant air pressure to your tool, and save
you the inconvenience of manually lubri-
cating your tool every time you use it.
Quick
Connector
Quick
Coupler
Air Hose Quick
Coupler
Quick
Connector
Lubricator
Filter
Regulator
Air
Compressor
Your
Tool
Figure 2. Typical filter/lubricator/regulator installation order
Check the current Grizzly catalog for avail-
ability of this unit. If you plan on install-
ing a filter/lubricator/regulator unit in your
compressed air system, always follow the
connection instructions that come with
the unit.
Exceeding the maximum permissible
operating pressure may damage the
seals, gaskets and hammer mecha-
nism of your nailer. DO NOT allow
your air compressor to exceed the
recommended pressure when con-
nected to this nailer or serious per-
sonal injury may result!

H7943 /H7944 Framing Nailer -7-
Testing the Safety
Nose Mechanism
A safety mechanism (bump fire) on the
nose of the nailer protects against acci-
dental firing. When the trigger is pressed,
the nailer will not fire until the safety nose
mechanism is depressed.
Before you use your nailer for the first
time, check the safety nose mechanism
to ensure proper function.
5. Without pressing the trigger, depress
the safety nose mechanism against a
scrap piece of wood that is clean and
free of any knots, nails, or other foreign
objects.
— If the nailer does not fire then the
safety nose mechanism is working
correctly.
— If the nailer does fire when you
depress the safety nose, immedi-
ately disconnect the nailer from the
air supply and call Grizzly Technical
Support at [phone] for help.
6. Without depressing the safety nose,
point the nailer in a safe direction, and
pull the trigger.
— If the nailer does not fire, then the
safety nose mechanism is working
correctly.
— If the nailer does fire when the trig-
ger is pulled, without the safety nose
mechanism being depressed, then
the nailer has been damaged. For
help, call Grizzly Technical Support
at [phone] for help.
The safety mechanism is a mechanical
device that can fail. Never rely on this
mechanism as an excuse to point the
nailer at yourself or any bystanders.
Serious injury may occur.
To verify that the safety nose is working
correctly:
1. DISCONNECT NAILER FROM THE
AIR SUPPLY!
2. Make sure the magazine contains no
nails.
3. Make sure the trigger and the safety
nose mechanism move up and down
without sticking.
4. Connect the nailer to the air supply.

H7943 /H7944 Framing Nailer
-8-
OPERATIONS
Loading
Figure 3. Loading nails in the magazine.
Use nails meeting these specifications:
Model H7943
Nail Type: Round Head
Strip Angle: 21º
Nail Diameter: 0.113" - 0.161"
Nail Length: 2"– 4"
Magazine Capacity: 66 nails.
Model H7944
Nail Type: Clipped Head
Strip Angle: 34º
Nail Diameter: 0.113" - 0.148"
Nail Length: 2"– 4"
Magazine Capacity: 90 nails.
To load nails in your nailer:
1. DISCONNECT NAILER FROM THE
AIR SUPPLY!
Figure 4. Pulling the pusher back.
3. Pull the pusher to the rear of the maga-
zine, as shown in Figure 4.
4. Slide the nails forward.
5. Point the nailer away from you. Release
the pusher until it contacts the nails, as
shown in Figure 5. (Do not let it snap).
Figure 5. Releasing the pusher.
2. Slide a strip of nails into the magazine
from the rear; and slide them past the
nail stopper, as shown in Figure 3.
Point the nailer away from you and
others when connecting the air supply.
The nailer can cycle and discharge a
nail when the air supply is connected.
Ignoring this warning may result in
serious personal injury.