Basic Tool Operation

Stanley-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:

BASIC SINGLE PISTON STAPLER/NAILER

EXHAUST	FIG.1
OPEN	AT REST
PISTON	EXHAUST
STOP	SEALED BY
	PISTON STOP

HEAD VALVE CLOSED

	RESERVOIR	TRIGGER VALVE PORT
	RESERVOIR	(TO SUPPLY AIR TO TOP OF HEAD VALVE)
	OF HIGH	(TO SUPPLY AIR TO TOP OF HEAD VALVE)
	OF HIGH
	PRESSURE	RESERVOIR OF
	AIR	RESERVOIR OF
	HOLES IN	HIGH PRESSURE AIR
	HOLES IN
	CYLINDER
	WALL
	RETURN	TRIGGER VALVE RELEASED
	CHAMBER	TRIGGER VALVE RELEASED
	CHAMBER
	BUMPER
		PASSAGE FOR
		AIR RELEASED FROM HEAD VALVE
		SLOTS FOR AIR FLOW
		FOR PISTON RETURN
	FIG.3
EXHAUST	END OF STROKE	EXHAUST	FIG.4
	TRIGGER STILL		FIG.4
	TRIGGER STILL		RETURNING
STILL	PULLED	OPEN	RETURNING
CLOSED	PULLED
	HEAD VALVE OPEN
			HEAD VALVE CLOSED
AIR FLOWS
INTO
RETURN
CHAMBER		AIR IN
		RETURN
		CHAMBER
PISTON IS	TRIGGER VALVE	PUSHES
	TRIGGER VALVE	PISTON
	STILL ACTUATED	PISTON
SEALED	STILL ACTUATED	UPWARD
SEALED		UPWARD

AGAINST		TRIGGER VALVE
BUMPER		TRIGGER VALVE
BUMPER	RELEASED –
	RELEASED –
	AIR PRESSURE RETURNS
	TO TOP OF HEAD VALVE

FIG.2

DRIVING STROKE

HEAD VALVE OPEN

TRIGGER VALVE PORT

BLOCKED

TRIGGER VALVE

ACTUATED

AIR RELEASED

FROM ABOVE

HEAD VALVE

MAINTAINING THE PNEUMATIC TOOL

!WARNING:

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.

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