U-Tech U 851 User manual

2004/01
S/N:
INDUSTRIAL PNEUMATIC NAILERS, STAPLERS
INSTRUCTION MANUAL
U 851 STAPLERS
READ AND UNDERSTAND THIS MANUAL BEFORE OPERATING THE TOOL!
IMPROPER USE OF THIS TOOL WILL RESULT IN DEATH OR SERIOUS
INJURY!
KEEP THIS MANUAL WITH THE TOOL FOR FUTURE REFERENCE.

1
TECHNICAL DATA
Applications…………………….
Subflooring, Sheathing, Crating, Furniture Frames, Wall
Sheathing
Features………………………...
Heavy Duty Stapler, Top Loading Magazine
Dimensions (H×L×W)………….
Weight…………………………..
Air Inlet……………………….…
□ NPT 1/4” ……………………….
□ PT 1/4”
Maximum Permissible Operating Pressure…………………………
120 PSI (8 BAR)
Recommended Operating Pressure…………………………………
70 – 100 PSI (5 – 7 BAR)
NOISE CHARACTERISTIC VALUES IN ACCORDANCE WITH ENxx1:
A-weighted single-event sound pressure level at operator’s position: L
PA, ls
＝ 94dBA
A-weighted single sound pressure level:L
pA,ls,lm
＝ 89dBA
Caution! AT THE WORKPLACE, ALWAYS WEAR HEARING PROTECTION EQUIPMENT
VIBRATION CHARACTERISTIC VALUES IN ACCORDANCE WITH ISO 8662, PART II ：
Weighted root mean square acceleration ＝ 3.2m/s2
2
SAFETY INSTRUCTIONS
●
READ ALL INSTRUCTIONS. Do not attempt to operate
the tool until you read and understand all safety
precautions and manual instructions.
●
●
Never use oxygen or combustible gas as a power source
for the tool. EXPLOSION MAY OCCUR.
Use dry, filtered, lubricated and regulated compressed air
only.
●
Never use gasoline or other flammable liquids to clean the
tool. Vapors in the tool will ignite by a spark and cause the
tool to explode.
●
Do not exceed maximum permissible operating pressure
120 PSI (8 BAR).
●
Disconnect the tool from air supply when: loading and
unloading, clearing jams, performing service or
maintenance and non-operation.
ALWAYS ASSUME THE TOOL IS LOADED!

3
SAFETY INSTRUCTIONS
●
●
●
Do not use the tool when changing one driving location to
another, involves the use of stairs, ladders or scaffolding.
Do not carry the tool with your finger on the trigger.
Do not carry the tool by the hose or pull the hose to move
the tool. Carry the tool only the handle.
●
●
●
Wear eye protection with side shields that conform to ANSI
Z87.1 specifications.
Wear eye protection where tools are being operated.
FREE FLIGHT FASTENERS OR DEBRIS WILL CAUSE
PERMANENT EYE INJURY.
Wear hearing protection and hard hats.
●
●
●
Never point the tool at yourself or at any other person at all
times.
Never operate the tool while working above others.
DEATH OR SERIOUS INJURY MAY OCCUR.
No horseplay! Work safe!
●
●
●
●
Use air compressors that meet ANSI B19.3 safety
standards.
Use pressure regulator, filter and oiler.
Use air supply hose rated for 150 PSIG minimum.
Do not use a check valve or any other fitting that allows air
to remain in the tool.
4
TOOL MAINTENANCE
● VISUAL INSPECTION
1. Smooth safety and trigger movement.
2. All screws are tightened.
3. Never use damaged or incomplete tool.
● CLEANING
The periodical cleaning of the tool is recommended to ensure proper
functioning.
1. Disconnect the tool from air supply.
2. Remove all fasteners
3. Clear the magazine and nose sections with a blowgun to remove any
accumulated debris.
4. Check for free movement of the trigger, follower and work contact element.
Remove any obstructions carefully.
5. Oil tool daily with proper air tool oil.
6. Empty the air tanks on your compressor daily to prevent moisture buildup in
the air lines.
● LUBRICATION
The tool should be lubricated daily.
1. Add a few drops of non-detergent oil in the tool air inlet before each use.
2. Never use detergent oils, which can damage o-rings causing the tool to
malfunction.
3. Wipe off excessive oil from the exhaust.
Excessive oil will damage o-rings of tool.

5
TOOL OPERATION
1.
Protect your eyes and ears. Wear Z87.1 safety glasses with side shields. Wear
hearing protection. Employers and users are responsible for ensuring the user or
anyone near the tool wears this safety protection.
2.
Check and replace any damaged or worn components on the tool. The safety
warning labels on the tool must also be replaced if they are illegible.
3.
Add a few drops of lubricant into the air inlet.
4.
Install a quick connect fitting to the tool.
5.
Connect the tool to an air compressor using a 3/8” I.D. hose. Make sure the
tool is
not loaded and the hose has a rated working pressure exceeding 200 PSI (13.8
BAR).
6.
Regulate the air pressure to obtain 70 PSI (5 BAR) at the
tool. Check the operation of the safety yoke mechanism.
7.
8.
Insert fasteners into your tool following the instructions of loading the tool.
Reconnect the air hose to the tool.
9.
Test for proper fastener penetration by driving fasteners
into a piece of wood. If the fasteners do not achieve the
desired penetration, regulate the air pressure to a higher
setting until the desired penetration is achieved. Do not
exceed 120 PSI (8 BAR) at the tool.
6
TOOL LOADING – SIDE LOAD DESIGN
1. Disconnect air supply.
2. Unlatch and slide rearward the magazine
3. Insert fasteners and slide magazine forward to
engage.
4. Connect air supply to the tool.
TOOL LOADING – TOP LOAD DESIGN
1. Disconnect air supply.
2. Pull back on nail pusher in magazine unit until it
locks in the rear position.
3. Insert strips of fasteners into the magazine.
4. Release the nail pusher gently allowing it to move
forward to engage the fasteners in the magazine.
5. Connect air supply to the tool.

7
TOOL LOADING – BOTTOM LOAD DESIGN
1. Disconnect air supply.
2. Unlatch and slide rearward the magazine
3. Insert fasteners and slide magazine forward to
engage.
4. Connect air supply to the tool.
TOOL LOADING – REAR LOAD DESIGN
1. Disconnect air supply.
2. Insert a strip of fasteners into the magazine
from the rear slot.
3. Pull the nail pusher backwards gently allowing
the
fasteners to slide forward. Release the nail
pusher to engage the fasteners.
4. Connect air supply to the tool.
8
TROUBLESHOOTING
Stop using the tool immediately if any of the following problems occurs. Serious
personal injury could occur. Necessary repair or replacement must be carried out by
a qualified and trained technician of an authorized service location.
PROBLEM CAUSE TROUBLESHOOTING
Tool not lubricated. Lubrication.
Broken spring in cap
assembly.
Replace spring.
Weak drive.
Exhaust port in cap is
blocked.
Clean or replace dam-
aged internal parts.
Worn or damaged nose. Replace nose.
Damaged driver. Replace driver.
Incorrect size of fasteners.
Use recommended
fasteners.
Bent fasteners. Replace with new
fasteners.
Tool jams.
Magazine or nose screws
are loose.
Tighten screws.
Fasteners jammed in
magazine or discharge
area.
Inspect and clean
magazine.
Piston shaft is damaged. Replace piston shaft.
Tool does not fire.
Air pressure too low. Check/increase air pres-
sure.

9
TROUBLESHOOTING
Stop using the tool immediately if any of the following problems occurs. Serious
personal injury could occur. Necessary repair or replacement must be carried out by
a qualified and trained technician of an authorized service location.
PROBLEM CAUSE TROUBLESHOOTING
Air leaking at trigger valve
area.
Damaged O-rings in
trigger valve housing.
Replace O-rings & check
the operation of safety yoke
mechanism.
Loose screws in
housing.
Tighten screws.
Damaged O-rings. Replace O-rings.
Air leaking between
housing and nose.
Damaged bumper. Replace bumper.
Loose screws. Tighten screws.Air leaking between
housing and cap assy. Damaged seal. Replace seal.
Worn bumper. Replace bumper.
Dirt in nose. Clean nose.
Dirt or damage prevents
fasteners from moving
freely in magazine.
Clean magazine and
inspect/repair damage.
Inadequate air inflow. Check fitting, hose, com-
pressor & air pressure.
Worn O-ring on piston
or lack of lubrication.
Replace O-rings.
Lubrication.
Damaged O-rings on
trigger valve.
Replace O-rings.
Air leaks. Tighten screws and fittings.
Tool skips driving
fastener.
Air leakage due to worn
cap seal.
Replace seal.
10
LU-1580F
L 38-64mm (1 1/2”~2
1/2”)
A 11.2mm (7/16”)
B 1.7mm (.067”)
C 1.9mm (.075”)
LU-951PDF
L 25-50mm (1”~2”)
A 12.8mm (1/2”)
B 1.4mm (.055”)
C 1.6mm (.063”)
LU-851F
L 25-50mm (1”~2”)
A 11.2mm (7/16”)
B 1.4mm (.055”)
C 1.6mm (.063”)
LU-864F
L 38-64mm (1 1/2”~2
1/2”)
A 11.2mm (7/16”)
B 1.4mm (.055”)
C 1.6mm (.063”)
FASTENERS

11
LU-851KGF
L 25-50mm (1”~2”)
A 10.9mm (7/16”)
B 1.4mm (.055”)
C 1.6mm (.063”)
LU-864KGF
L 38-64mm (1 1/2”~2
1/2”)
A 10.9mm (7/16”)
B 1.6mm (.063”)
C 1.4mm (.055”)
LU-951F
L 25-50mm (1”~2”)
A 12.25mm (1/2”)
B 1.4mm (.055”)
C 1.6mm (.063”)
LU-964F
L 38-64mm (1 1/2”~2
1/2”)
A 12.25mm (1/2”)
B 1.4mm (.055”)
C 1.6mm (.063”)
FASTENERS
12