BEFORE OPERATING THIS TOOL, ALL OPERATORS SHOULD STUDY THIS MANUAL TO
UNDERSTAND AND FOLLOW THE SAFETY WARNINGS AND INSTRUCTIONS. KEEP THESE
INSTRUCTIONS WITH THE TOOL FOR FUTURE REFERENCE. IF YOU HAVE ANY QUESTIONS,
CONTACT YOUR STANLEY-BOSTITCH REPRESENTATIVE OR DISTRIBUTOR.
ANTES DE OPERAR ESTA HERRAMIENTA, TODOS LOS OPERADORES DEBERÁN ESTUDIAR
ESTE MANUAL PARAPODER COMPRENDER Y SEGUIR LAS ADVERTENCIAS SOBRE SEGURIDAD Y LAS INSTRUCCIONES. MANTENGA ESTAS INSTRUCCIONES CON LA HERRAMIENTA
PARA FUTURA REFERENCIA, SI TIENE ALGUNA DUDA, COMUNÍQUESE CON SU REPRESENTANTE DE STANLEY-BOSTITCH O CON SU DISTRIBUIDOR.
LIRE ATTENTIVEMENT LE PRÉSENT MANUEL AVANT D’UTILISER L’APPAREIL. PRÉTER UNE
ATTENTION TOUTE PARTICULIÈRE AUX CONSIGNES DE SÉCURITÉ ET AUX AVERTISSEMENTS. GARDER CE MANUEL AVEC L’OUTIL POUR FUTUR RÉFÉRENCE. SI VOUS AVEZ DES
QUESTIONS, CONTACTEZ VOTRE REPRÉSENTANT OU VOTRE CONCESSION NAIRE
STANLEY-BOSTITCH.
OPERATION and MAINTENANCE MANUAL
MANUEL D’INSTRUCTIONS ET D’ENTRETIEN
MANUAL DE OPERACIÓN Y DE MANTENIMIENTO
MARK III
PNEUMATIC TOOLS
HERRAMIENTAS NEUMÁTICAS
CLOUEURS PNEUMATIQUES
103701REVD 5/99
BOSTITCH
®
®
BOSTITCH
Stanley Fastening Systems
-2-
INTRODUCTION
The Stanley-Bostitch MIII is a precision-built tool, designed for high speed, high volume
fastening. These tools will deliver efficient, dependable service when used correctly and with
care. As with any fine power tool, for best performance the manufacturer’s instructions must
be followed. Please study this manual before operating the tool and understand the safety
warnings and cautions. The instructions on installation, operation and maintenance should be
read carefully, and the manual kept for reference. NOTE: Additional safety measures may be
required because of your particular application of the tool. Contact your Stanley-Bostitch
representative or distributor with any questions concerning the tool and its use.
Stanley-Bostitch, Inc., East Greenwich, Rhode Island 02818.
INDEX
Safety Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Tool Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7, 8 & 9
Basic Tool Operation (diagram). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Maintaining the Pneumatic Tool . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Trouble Shooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Air Supply: Fittings, Hoses, Filters, Air Consumption, Regulators,
Operating Pressure, Setting Correct Pressure . . . . . . . . . . . . . . . . . . . 5
Lubrication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Tool Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Loading the Tool . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Maintaining the MIII Series Tools. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
NOTE:
Stanley-Bostitch tools have been engineered to provide excellent customer satisfaction and are
designed to achieve maximum performance when used with precision Stanley-Bostitch fasteners
engineered to the same exacting standards.
Stanley-Bostitch cannot assume responsibility for product performance if our tools are
used with fasteners or accessories not meeting the specific requirements established for
genuine Stanley-Bostitch nails, staples and accessories.
LIMITED WARRANTY
Stanley-Bostitch, Inc., warrants to the original retail purchaser that this product is free from defects
in material and workmanship, and agrees to repair or replace, at Stanley-Bostitch's option, any
defective product within 1 year from the date of purchase. This warranty is not transferable. It only
covers damage resulting from defects in material or workmanship, and it does not cover conditions
or malfunctions resulting from normal wear, neglect, abuse, accident or repairs attempted or made
by other than our regional repair center or authorized warranty service center. Driver blades,
bumpers and o-rings are considered normally wearing parts.
THIS WARRANTY IS IN LIEU OF ALL OTHER EXPRESS WARRANTIES. ANY WARRANTYOF
MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE IS LIMITED TO THE DURATION OF THIS WARRANTY.
STANLEY-BOSTITCH SHALL NOT BE LIABLE FOR ANY INCIDENTAL OR CONSEQUENTIAL
DAMAGES.
This warranty is limited to sales in the United States and Canada. Some states do not allow limitations on how long an implied warranty lasts, or the exclusion or limitation of incidental or consequential damages, so the above limitations or exclusions may not apply to you. This warranty gives
you specific legal rights, and you may also have other rights which vary from state to state.
To obtain warranty service, return the product at your expense together with proof of purchase to a
Stanley-Bostitch Regional or authorized warranty repair center. You may call us at 1-800-556-6696
for the location of authorized warranty service centers in your area.
®
FASTENERS
PROTECT YOUR TOOLS
USE ONLY GENUINE
-3-
SAFETY INSTRUCTIONS
EYE PROTECTION which conforms to ANSI specifications and provides protection
against flying particles both from the FRONT and SIDE should ALWAYS be worn
by the operator and others in the work area when loading, operating or servicing
this tool. Eye protection is required to guard against flying fasteners and debris,
which could cause severe eye injury.
The employer and/or user must ensure that proper eye protection is worn. Eye
protection equipment must conform to the requirements of the American National
Standards Institute, ANSI Z87.1-1989 and provide both frontal and side protection.
NOTE: Non-side shielded spectacles and face shields alone do not provide adequate protection.
CAUTION:
ADDITIONAL SAFETY PROTECTION will be required in some environments. For example, the working area may include exposure to noise level which
can lead to hearing damage. The employer and user must ensure that any necessary
hearing protection is provided and used by the operator and others in the work area.
Some environments will require the use of head protection equipment. When
required, the employer and user must ensure that head protection conforming to
ANSI Z89.1 1986 is used.
AIR SUPPLY AND CONNECTIONS
Do not use oxygen, combustible gases, or bottled gases as a power source for this
tool as tool may explode, possibly causing injury.
Do not use supply sources which can potentially exceed 200 P.S.I.G. as tool may
burst, possibly causing injury.
The connector on the tool must not hold pressure when air supply is disconnected. If a wrong fitting is used, the tool can remain charged with air after disconnecting and thus will be able to drive a fastener even after the air line is disconnected possibly causing injury.
Do not pull trigger or depress contact arm while connected to the air supply as the
tool may cycle, possibly causing injury.
Always disconnect air supply: 1.) Before making adjustments; 2.) When servicing
the tool; 3.) When clearing a jam; 4.) When tool is not in use; 5.) When moving to a
different work area, as accidental actuation may occur, possibly causing injury.
LOADING TOOL
When loading tool: 1.) Never place a hand or any part of body in fastener discharge area of tool; 2.) Never point tool at anyone; 3.) Do not pull the trigger or
depress the trip as accidental actuation may occur, possibly causing injury.
OPERATION
Always handle the tool with care: 1.) Never engage in horseplay; 2.) Never pull
the trigger unless nose is directed toward the work; 3.) Keep others a safe distance from the tool while tool is in operation as accidental actuation may occur,
possibly causing injury.
The operator must not hold the trigger pulled on contact arm tools except during fastening operation as serious injury could result if the trip accidentally contacted someone or something, causing the tool to cycle.
Keep hands and body away from the discharge area of the tool. Acontact arm tool
may bounce from the recoil of driving a fastener and an unwanted second fastener may be driven possibly causing injury.
Check operation of the contact arm mechanism frequently. Do not use the tool if
the arm is not working correctly as accidental driving of a fastener may result. Do
not interfere with the proper operation of the contact arm mechanism.
Do not drive fasteners on top of other fasteners or with the tool at an overly steep
angle as this may cause deflection of fasteners which could cause injury.
Do not drive fasteners close to the edge of the work piece as the wood may split,
allowing the fastener to be deflected possibly causing injury.
MAINTAINING THE TOOL
When working on air tools note the warnings in this manual and use extra care
when evaluating problem tools.
-4-
MIII TOOL SPECIFICATIONS
All screws and nuts are english
FASTENER SPECIFICATIONS:
TOOL AIR FITTING:
This tool uses a 3/8” N.P.T. male plug. The inside diameter should be .275” (7mm) or larger.
The fitting must be capable of discharging tool air pressure when disconnected from the air
supply.
OPERATING PRESSURE:
60 to 100 p.s.i.g. (4.2 to 7.1 kg/cm2). Select the operating pressure within this range for best
fastener performance.
DO NOT EXCEED THIS RECOMMENDED OPERATING PRESSURE.
AIR CONSUMPTION:
The MIII requires 7.1 cubic feet per minute (201 liters per minute) of free air to operate at the
rate of 100 fasteners per minute, at 80 p.s.i. (5.6 kg/cm2). Take the actual rate at which the tool
will be run to determine the amount of air required. For instance, if your fastener usage
averages 50 fasteners per minute, you need 50% of the tool’s c.f.m. of free air which is required
to operate the tool at 100 fasteners per minute.
MODEL LENGTH HEIGHT WIDTH WEIGHT
MIII812CNCT 10.88” (275mm) 12.81” (325mm) 2.75” (70mm) 7.2lbs (3.3kg)
MIII886BCF 10.88” (275mm) 12.81” (325mm) 2.75” (70mm) 6.7lbs (3.1kg)
MIII975-952LCT 14.12” (360mm) 12.81” (325mm) 2.75” (70mm) 7.2lbs (3.3kg)
MODEL FASTENER WIRE SIZE MAX LENGTH
MIII812CNCT BT .097 (2.5mm) 2-3/8” (60.3mm)
MIII886BCF CORRUGATED ------ 1/2” (12.7mm)
MIII975-952LCT BT .086 (2.2mm) 2” (50mm)
STANLEY-BOSTITCH OFFERS TWO TYPES OF OPERATION FOR THIS SERIES TOOL.
CONTACT TRIP
The common operating procedure on “Contact Trip” tools is for the operator to contact the
work to actuate the trip mechanism while keeping the trigger pulled, thus driving a
fastener each time the work is contacted. This will allow rapid fastener placement on
many jobs, such as sheathing, decking and pallet assembly.
All pneumatic tools are subject to recoil when driving fasteners. The tool may bounce,
releasing the trip, and if unintentionally allowed to recontact the work surface with the
trigger still actuated (finger still holding trigger pulled) an unwanted second fastener
will be driven.
TRIGGER OPERATED
The Trigger Operated model is cycled by actuation of the trigger only. This model does
not have a Contact Arm and is intended for use only where a Contact Arm CANNOT be
used to satisfy the requirements of the application.
The Trigger Operated tool will cycle each time the trigger is actuated.
MODEL IDENTIFICATION:
Refer to Operation Instructions on page 4 before proceeding to use this tool.
CONTACT TRIP TRIGGER OPERATED
Identified by: Identified by:
BLACK TRIGGER BLACK TRIGGER
OPERATION
AIR SUPPLY AND CONNECTIONS
Do not use oxygen, combustible gases, or bottled gases as a power
source for this tool as tool may explode, possibly causing injury.
FITTINGS:
Install a male plug on the tool which is free flowing and which will release air pressure from the
tool when disconnected from the supply source.
HOSES:
Air hoses should have a minimum of 150 p.s.i. (10.6 kg/cm2) working pressure rating or 150
percent of the maximum pressure that could be produced in the air system. The supply hose
should contain a fitting that will provide “quick disconnecting” from the male plug on the tool.
SUPPLY SOURCE:
Use only clean regulated compressed air as a power source for this tool. NEVER USE OXYGEN, COMBUSTIBLE GASES, OR BOTTLED GASES, AS A POWER SOURCE FOR THIS
TOOL AS TOOL MAY EXPLODE.
REGULA
TOR:
A pressure regulator with an operating pressure of 0 - 125 p.s.i. (0 - 8.79 KG/CM2) is required
to control the operatiing pressure for safe operation of this tool. Do not connect this tool to air
pressure which can potentially exceed 200 p.s.i. (14 KG/CM
2
)as tool may fracture or burst,
possibly causing injury.
OPERATING PRESSURE:
Do not exceed recommended maximum operating pressure as tool wear will be greatly
increased. The air supply must be capable of maintaining the operating pressure at the tool.
Pressure drops in the air supply can reduce the tool’s driving power. Refer to “TOOL SPECI-
FICATIONS” for setting the correct operating pressure for the tool.
FILTER:
Dirt and water in the air supply are major causes of wear in pneumatic tools. Afilter will help
to get the best performance and minimum wear from the tool. The filter must have adequate
flow capacity for the specific installation. The filter has to be kept clean to be effective in providing clean compressed air to the tool. Consult the manufacturer’s instructions on proper
maintenance of your filter. A dirty and clogged filter will cause a pressure drop which will
reduce the tool’s performance.
LUBRICATION
Frequent, but not excessive, lubrication is required for best performance. Oil added through the
air line connection will lubricate the internal parts. Use STANLEY-BOSTITCH Air Tool Lubricant, Mobil
Velocite #10, or equivalent. Do not use detergent oil or additives as these lubricants will cause accelerated wear to the seals and bumpers in the tool, resulting in poor tool performance and frequent tool
maintenance.
If no airline lubricator is used, add oil during use into the air fitting on the tool once or twice a day.
Only a few drops of oil at a time is necessary. Too much oil will only collect inside the tool and will be
noticeable in the exhaust cycle.
COLD WEATHER OPERATION:
For cold weather operation, near and below freezing, the moisture in the air line may freeze and prevent tool operation. We recommend the use of STANLEY-BOSTITCH WINTER FORMULA air tool
lubricant or permanent antifreeze (ethylene glycol) as a cold weather lubricant.
CAUTION:
Do not store tools in a cold weather environment to prevent frost or ice formation
on the tools operating valves and mechanisms that could cause tool failure.
NOTE:
Some commercial air line drying liquids are harmful to “O”-rings and seals – do not use
these low temperature air dryers without checking compatibility.
-5-
-6-
EYE PROTECTION which conforms to ANSI specifications and provides protection against flying particles both from the FRONT and SIDE should ALWAYS be
worn by the operator and others in the work area when loading, operating or servicing this tool. Eye protection is required to guard against flying fasteners and
debris, which could cause severe eye injury.
The employer and/or user must ensure that proper eye protection is worn. Eye
protection equipment must conform to the requirements of the American National
Standards Institute, ANSI Z87.1-1989 and provide both frontal and side protection.
NOTE: Non-side shielded spectacles and face shields alone do not provide adequate protection.
TO PREVENT ACCIDENTAL INJURIES:
• Never place a hand or any other part of the body in nail discharge area of tool
while the air supply is connected.
• Never point the tool at anyone else.
• Never engage in horseplay.
• Never pull the trigger unless nose is directed at the work.
• Always handle the tool with care.
• Do not pull the trigger or depress the trip mechanism while loading the tool.
LOADING THE MIII
NOTE: Use only fasteners recommended for use in Bostitch MIII series models.
ST APLE AND NAIL LOADING:
Pull cover open. Insert stick of staples or nails. Push
cover forward until the detent pin snaps into place, locking the cover. The tool is now ready to operate.
CORRUGATED FASTENER LOADING:
Push cover stop down to release cover and pull cover
open. Check the length of the corrugated fasteners to
be loaded - then check to see if the cover is adjusted
for your corrugated fastener length.
If adjustment is necessary - with cover pulled back,
push cover release pin down and pull cover out of the
magazine. Insert cover in other set of slots and push
forward while pressing down on cover stop pin at the
same time.
Load corrugated fasteners by tilting the nose of the tool
downward and inserting sticks.
Push cover forward until cover latch pin snaps into
place. The tool is now ready to operate. Load corrugated fasteners with points down. Points are colored for
identification - load colored side down.
TOOL OPERATION
OPERATION
EYE PROTECTION which conforms to ANSI specifications and provides protection against flying particles both from the FRONT and SIDE should
ALWAYS be worn by the operator and others in the work area when loading,
operating or servicing this tool. Eye protection is required to guard against
flying fasteners and debris, which could cause severe eye injury.
The employer and/or user must ensure that proper eye protection is worn.
Eye protection equipment must conform to the requirements of the
American National Standards Institute, ANSI Z87.1-1989 and provide both
frontal and side protection. NOTE: Non-side shielded spectacles and face
shields alone do not provide adequate protection.
BEFORE HANDLING OR OPERATING THIS TOOL:
I. READ AND UNDERSTAND THE WARNINGS CONTAINED IN
THIS MANUAL.
II. REFER TO “TOOL SPECIFICATIONS” IN THIS MANUAL TO
IDENTIFY THE OPERATING SYSTEM ON YOUR TOOL.
1. TRIGGER OPERATION
A TRIGGER OPERATED tool requires a single action to drive a fastener. Each time the
trigger is pulled the tool will drive a fastener. The trigger operated model is intended for
use only when a contact trip or sequential trip cannot be used due to the requirements of
the application.
2. CONTACT TRIP OPERATION
The CONTACT TRIP MODEL tool contains a contact trip that operates in conjunction with
the trigger to drive a fastener. There are two methods of operation to drive fasteners with
a contact trip tool.
A. SINGLE FASTENER PLACEMENT: To operate the tool in this manner, first
position the contact trip on the work surface, WITHOUT PULLING THE TRIGGER.
Depress the contact trip until the nose touches the work surface and then pull the
trigger to drive a fastener. Do not press the tool against the work with extra force.
Instead, allow the tool to recoil off the work surface to avoid a second unwanted
fastener. Remove your finger from the trigger after each operation.
B. RAPID FASTENER OPERATION: To operate the tool in this manner, hold the
tool with the contact trip pointing towards but not touching the work surface. Pull
the trigger and then tap the contact trip against the work surface using a bouncing
motion. Each depression of the contact trip will cause a fastener to be driven.
There are three available systems on STANLEY-BOSTITCH pneumatic tools. They are:
1. TRIGGER OPERATION 2. CONTACT TRIP OPERATION 3. SEQUENTIAL TRIP OPERATION
The operator must not hold the trigger pulled on contact trip tools
except during fastening operation, as serious injury could result if the
trip accidentally contacted someone or something, causing the tool to
cycle.
Keep hands and body away from the discharge area of the tool. A
contact trip tool may bounce from the recoil of driving a fastener and
an unwanted second fastener may be driven, possibly causing injury.
3. SEQUENTIAL TRIP OPERATION:
The SEQUENTIAL TRIP MODEL contains a contact trip that operates in conjunction
with the trigger to drive a fastener. To operate a sequential trip tool, first position the
contact trip on the work surface WITHOUT PULLING THE TRIGGER. Depress the
contact trip and then pull the trigger to drive a fastener. As long as the contact trip is
contacting the work and is held depressed, the tool will drive a fastener each time the
trigger is depressed. If the contact trip is allowed to leave the work surface, the
sequence described above must be repeated to drive another fastener.
-7-
TOOL OPERATION CHECK:
CAUTION: Remove all fasteners from tool before performing tool operation check.
1. TRIGGER OPERATED TOOL:
A. With finger off the trigger, hold the tool with a firm grip on the handle.
B. Place the nose of the tool against the work surface.
C. Pull the trigger to drive. Release the trigger and cycle is complete.
CAUTION: THE TOOL WILL CYCLE EACH TIME THE TRIGGER IS PULLED!
2. CONTACT TRIP OPERATION:
A. With finger off the trigger, press the contact trip against the work surface.
THE TOOL MUST NOT CYCLE.
B. Hold the tool off the work surface, and pull the trigger.
THE TOOL MUST NOT CYCLE.
C. With the tool off the work surface, pull the trigger.
Press the contact trip against the work surface.
THE TOOL MUST CYCLE.
D. Without touching the trigger, press the contact trip against the work surface,
then pull the trigger.
THE TOOL MUST CYCLE.
3. SEQUENTIAL TRIP OPERATION:
A. Press the contact trip against the work surface, without touching the trigger.
THE TOOL MUST NOT CYCLE.
B. Hold the tool off the work surface and pull the trigger.
THE TOOL MUST NOT CYCLE.
Release the trigger. The trigger must return to the trigger stop on the frame.
C. Pull the trigger and press the contact trip against the work surface.
THE TOOL MUST NOT CYCLE.
D. With finger off the trigger, press the contact trip against the work surface. Pull the trigger.
THE TOOL MUST CYCLE.
IN ADDITION TO THE OTHER WARNINGS CONTAINED IN THIS MANUAL OBSERVE THE FOLLOWING FOR SAFE OPERATION
• Use the STANLEY-BOSTITCH pneumatic tool only for the purpose for which it was
designed.
• Never use this tool in a manner that could cause a fastener to be directed toward the user
or others in the work area.
• Do not use the tool as a hammer.
• Always carry the tool by the handle. Never carry the tool by the air hose.
• Do not alter or modify this tool from the original design or function without approval from
STANLEY-BOSTITCH, INC.
• Always be aware that misuse and improper handling of this tool can cause injury to
yourself and others.
• Never clamp or tape the trigger or contact trip in an actuated position.
• Never leave a tool unattended with the air hose attached.
• Do not operate this tool if it does not contain a legible WARNING LABEL.
• Do not continue to use a tool that leaks air or does not function properly. Notify your
nearest Stanley-Bostitch representative if your tool continues to experience
functional problems.
-8-
-9-
MAINTAINING THE PNEUMATIC TOOL
When working on air tools, note the warnings in this manual and use extra care
evaluating problem tools.
CAUTION: Pusher spring (constant force spring). Caution must be used when working with
the spring assembly. The spring is wrapped around, but not attached to, a roller. If the spring
is extended beyond its length, the end will come off the roller and the spring will roll up with a
snap, with a chance of pinching your hand. Also the edges of the spring are very thin and
could cut. Care must also be taken to insure no permanent kinks are put in the spring as this
will reduce the springs force.
REPLACEMENT PARTS:
STANLEY-BOSTITCH replacement parts are recommended. Do not use modified parts or parts
which will not give equivalent performance to the original equipment.
ASSEMBLY PROCEDURE FOR SEALS:
When repairing a tool, make sure the internal parts are clean and lubricated. Use Parker “O”-LUBE
or equivalent on all “O”-rings. Coat each “O”-ring with “O”-LUBE before assembling. Use a small
amount of oil on all moving surfaces and pivots. After reassembly add a few drops of
STANLEY-BOSTITCH Air Tool Lubricant through the air line fitting before testing.
AIR SUPPLY-PRESSURE AND VOLUME:
Air volume is as important as air pressure. The air volume supplied to the tool may be inadequate
because of undersize fittings and hoses, or from the effects of dirt and water in the system.
Restricted air flow will prevent the tool from receiving an adequate volume of air, even though the
pressure reading is high. The results will be slow operation, misfeeds or reduced driving power.
Before evaluating tool problems for these symptoms, trace the air supply from the tool to the supply
source for restrictive connectors, swivel fittings, low points containing water and anything else that
would prevent full volume flow of air to the tool.
Trigger valve housing leaks air O-ring cut or cracked . . . . . . . . . . . . . .Replace O-ring
Trigger valve stem leaks air O-ring/seals cut or cracked . . . . . . . . .Replace trigger valve assembly
Frame/nose leaks air Loose nose screws . . . . . . . . . . . . . . .Tighten and recheck
O-ring or Gasket is cut or cracked . . . .Replace O-ring or gasket
Bumper cracked/worn . . . . . . . . . . . . .Replace bumper
Frame/cap leaks air Damaged gasket or seal . . . . . . . . . . .Replace gasket or seal
Cracked/worn head valve bumper . . . .Replace bumper
Loose cap screws . . . . . . . . . . . . . . . .Tighten and recheck
Failure to cycle Air supply restriction . . . . . . . . . . . . . . .Check air supply equipment
Tool dry, lack of lubrication . . . . . . . . . .Use STANLEY-BOSTITCH Air Tool Lubricant
Worn head valve O-rings . . . . . . . . . . .Replace O-rings
Broken cylinder cap spring . . . . . . . . . .Replace cylinder cap spring
Head valve stuck in cap . . . . . . . . . . . .Disassemble/Check/Lubricate
Lack of power; slow to cycle Tool dry, lacks lubrication . . . . . . . . . . .Use STANLEY-BOSTITCH Air Tool Lubricant
Broken cylinder cap spring . . . . . . . . . .Replace cap spring
O-rings/seals cut or cracked . . . . . . . . .Replace O-rings/seals
Exhaust blocked . . . . . . . . . . . . . . . . .Check bumper, head valve spring, muffler
Trigger assembly worn/leaks . . . . . . . .Replace trigger assembly
Dirt/tar build up on driver . . . . . . . . . . .Disassemble nose/driver to clean
Cylinder sleeve not seated correctly
on bottom bumper . . . . . . . . . . . . . . . .Disassemble to correct
Head valve dry . . . . . . . . . . . . . . . . . . .Disassemble/lubricate
Air pressure too low . . . . . . . . . . . . . . .Check air supply equipment
Skipping fasteners; intermittent feed Worn bumper . . . . . . . . . . . . . . . . . . . .Replace bumper
Tar/dirt in driver channel . . . . . . . . . . . .Disassemble and clean nose and driver
Air restriction/inadequate air flow through
quick disconnect socket and plug . . . . .Replace quick disconnect fittings
Worn piston O-ring . . . . . . . . . . . . . . . .Replace O-ring, check driver
Tool dry, lacks lubrication . . . . . . . . . . .Use STANLEY-BOSTITCH Air Tool Lubricant
Damaged pusher spring . . . . . . . . . . . .Replace spring
Low air pressure . . . . . . . . . . . . . . . . .Check air supply system to tool
Loose magazine nose screws . . . . . . .Tighten all screws
Fasteners too short for tool . . . . . . . . .Use only recommended fasteners
Bent fasteners . . . . . . . . . . . . . . . . . . .Discontinue using these fasteners
Wrong size fasteners . . . . . . . . . . . . . .Use only recommended fasteners
Leaking head cap gasket . . . . . . . . . . .Tighten screws/replace gasket
Trigger valve O-ring cut/worn . . . . . . . .Replace O-ring
Broken/chipped driver . . . . . . . . . . . . .Replace driver (check piston O-ring)
Dry/dirty magazine . . . . . . . . . . . . . . . .Clean/lubricate use STANLEY-BOSTITCH
Air Tool Lubricant
Worn magazine . . . . . . . . . . . . . . . . . .Replace magazine
Fasteners jam in tool Driver channel worn . . . . . . . . . . . . . . .Replace nose/check door
Wrong size fasteners . . . . . . . . . . . . . .Use only recommended fasteners
Bent fasteners . . . . . . . . . . . . . . . . . . .Discontinue using these fasteners
Loose magazine/nose screws . . . . . . .Tighten all screws
Broken/chipped driver . . . . . . . . . . . . .Replace driver
-10-
TROUBLE SHOOTING
COIL NAILERS
Skipping fasteners; intermittent feed Feed piston dry . . . . . . . . . . . . . . . . . .Add STANLEY-BOSTITCH Air Tool Lubricant
in hole in feed piston cover
Feed piston O-rings cracked/worn . . . .Replace O-rings/check bumper and spring.
Lubricate assembly.
Check Pawl binding . . . . . . . . . . . . . . .Inspect Pawl and spring on door.
Must work freely.
Canister bottom not set correctly . . . . .Set canister bottom for length of nails
being used
Broken weld wires in nail coil . . . . . . . .Remove coil of nails and use another coil
Fasteners jam in tool/canister Wrong size fasteners for tool . . . . . . . .Use only recommended fasteners/check
canisterbottom adjustment
Broken welded wires in nail coil . . . . . .Remove coil of nails and use another coil
Wrong slide plate adjustment for
wire/plastic collated nail coil . . . . . . . . .Adjust switch pins for wire/plastic collated
nail coil
PROBLEM CAUSE CORRECTION
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T
O REPLACE PISTON:
a. Insert the flats on the lower end of the driver piston stem carefully into the end of
piston and plunger wrench, BC1009.
b. Using another special wrench, BC1009, or another wrench of the proper size,
unscrew the plunger from the upper end of the stem. After this is done, it will be
possible to lift the poppet off the stem.
c. Place the special wrench, BC1009, down over the piston stem onto the driver
piston, locking the piston ears in the slots in the wrench. Unscrew the piston from
the stem.
TO REPLACE DRIVER:
a. It is not necessary to disassemble the piston-poppet-driver assembly to replace the
driver. Pull the poppet up on the driver piston stem as far as it will go.
b. Insert special wrench, BC1009, over the driver piston, locking the piston ears in the
slots in the wrench.
Unscrew the piston from threaded portion of the stem.
c. To remove the driver blade from the piston stem, push the driver blade pin out of the
stem. This willrelease the blade.
d. Insert new driver blade into the slot in the end of the driver piston stem and
assemble the driver blade pin. Test the side play in the driver blade by grasping the
driver piston stem in one hand and the blade in the other and moving the blade
sideways in alignment with the slot in the stem. There should be a small amount of
side play in the blade. This is necessary to take care of any slight misalignment
between the blade and guide in the nose. If there is no side play, the blade should
be removed and the top (pin end) just barely dressed off with a stone. It is not
necessary to do more than smooth off the top to get the necessary side play. Do not
grind. Reinsert the blade and pin in the stem and test for side play once more.
Repeat as necessary to get this small amount of side play. Carefully examine the
large threaded portion of the piston stem. Anylon lock can be seen imbedded in a
recessed hole in the stem. It is very important that this nylon lock can be replaced
when its locking efficiency has been reduced through several disassemblies of the
piston. It is necessary to use the sharp point of a knife, or some such instrument, to
remove this nylon lock. Insert a new one by setting it into the recessed hole in the
stem, and tapping it gently until firmly seated. Reverse these instructions to
reassemble.
e. Assemble plunger flush with end of piston stem.
TO REPLACE PILOTED VALVE SEALS:
1. Remove exhaust deflectors and four hex socket head cap screws holding cap to
cylinder. Remove cap, exposing the poppet piston and piloted valve.
2. Remove gasket, piloted valve seat, piloted valve, spring and O-rings.
3. Clean all O-ring grooves. Lubricate new O-rings, and assemble.
4. After new O-rings have been assembled to piloted valve, insert spring into valve
body. Lay tool on its side and slide valve into position. Turn tool upright and replace
gasket.
5. After new O-ring has been assembled to valve seat, slide it through the gasket and
over the piloted valve.
6. Insert new O-ring in stepped hole in cap directly over piloted valve. Assemble cap
using four socket head cap screws and replace exhaust deflectors.
TO REPLACE WEAR PLATE OR BLADE GUIDE:
1. Separate the magazine from the nose by removing four socket head cap screws.
2. Remove and replace Wear Plate or Blade Guide.
TO REPLACE DETENT SPRING, OR PUSHER SPRING:
1. Remove Magazine.
2. Set the magazine down on a flat surface. Cup palm over the hooked end of the
cover to prevent the detent pin and the detent pin spring from popping out and being
lost when cover is removed. Turn the magazine upside down and reach in with a
small screw driver, or needle nose pliers, and lift the Pusher spring off the pusher.
Slide cover out the BACK end of the magazine.
3. To remove the springs from the magazine, use a 3/32” (2.4mm) pin punch and drive
the spring anchor pin out of the magazine body. Replace and reverse the
instructions to reassemble.
MAINTAINING THE MIII SERIES TOOLS
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ACCESSORIES AVAILABLE
BC675A Stationary Filter-Regulator Lubricator Assembly
BC744A Filter-Lube Carrier
BC1320 Kit to convert MIII719-989, MIII886BCF and MIII1394-1370 to a contact trip.
BC1467 Kit to convert MIII tools to remote control cycle
BC855 Wrench - Poppet
BC1009 Wrench - Poppet Piston
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