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BASIC TOOL OPERATION
Bostitch pneumatic tools are cycled by a compressed air operated single piston design.
The following illustrations show the four functional cycles that occur when the tool is operated to drive a fastener:
EXHAUST
OPEN
PISTON
STOP
RESERVOIR
OF HIGH PRESSURE
AIR
HOLES IN
CYLINDER
WALL
RETURN
CHAMBER
BUMPER
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| FIG.2 | ||||||||||||||||
| AT REST |
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| DRIVING STROKE | ||||||||||||||||
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| EXHAUST | |||||||||||
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| SEALED BY | |||||||||||
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| HEAD VALVE CLOSED | PISTON STOP |
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| HEAD VALVE OPEN | ||||||||||||
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| TRIGGER VALVE PORT |
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| TRIGGER VALVE PORT BLOCKED | ||||
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| (TO SUPPLY AIR TO TOP OF HEAD VALVE) |
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| RESERVOIR OF |
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| HIGH PRESSURE | AIR |
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| TRIGGER VALVE RELEASED |
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| TRIGGER VALVE |
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| ACTUATED |
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| PASSAGE FOR |
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| AIR RELEASED | ||||||
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| AIR RELEASED FROM HEAD VALVE |
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| FROM ABOVE | ||
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| HEAD VALVE | ||
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SLOTS FOR AIR FLOW
FOR PISTON RETURN
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| FIG.3 | EXHAUST | FIG.4 | |||||||||||
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| OPEN |
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| RETURNING | |||||||
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| END OF STROKE |
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| EXHAUST |
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| TRIGGER STILL |
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| STILL |
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| PULLED |
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| CLOSED |
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| HEAD VALVE CLOSED | ||||||
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| HEAD VALVE OPEN |
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| AIR FLOWS |
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| AIR IN |
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| INTO |
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| RETURN |
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| RETURN |
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| CHAMBER |
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| CHAMBER |
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| PUSHES |
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| PISTON |
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| UPWARD |
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| TRIGGER VALVE |
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| TRIGGER VALVE |
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| PISTON IS |
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| STILL ACTUATED |
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| RELEASED – |
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| SEALED |
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| AIR PRESSURE | RETURNS | ||
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| AGAINST |
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| TO TOP OF HEAD VALVE | ||||
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| BUMPER |
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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:
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
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.