Bostitch N100S manual Basic Tool Operation, Maintaining the Pneumatic Tool, Replacement Parts

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

FIG.1							FIG.2
AT REST							DRIVING STROKE
						EXHAUST
						SEALED BY
	HEAD VALVE CLOSED					PISTON STOP		HEAD VALVE OPEN
				TRIGGER VALVE PORT							TRIGGER VALVE PORT BLOCKED
				(TO SUPPLY AIR TO TOP OF HEAD VALVE)
			RESERVOIR OF
			HIGH PRESSURE		AIR
			TRIGGER VALVE RELEASED						TRIGGER VALVE
									ACTUATED
		PASSAGE FOR								AIR RELEASED
		AIR RELEASED FROM HEAD VALVE
										FROM ABOVE
										HEAD VALVE

SLOTS FOR AIR FLOW

FOR PISTON RETURN

		FIG.3		EXHAUST	FIG.4
				OPEN	RETURNING
		END OF STROKE
	EXHAUST	TRIGGER STILL
	STILL
		PULLED
	CLOSED					HEAD VALVE CLOSED
		HEAD VALVE OPEN
AIR FLOWS				AIR IN
	INTO			RETURN
	RETURN			CHAMBER
	CHAMBER			PUSHES
				PISTON
				UPWARD				TRIGGER VALVE
			TRIGGER VALVE
	PISTON IS
			STILL ACTUATED				RELEASED –
	SEALED						AIR PRESSURE		RETURNS
	AGAINST
							TO TOP OF HEAD VALVE
	BUMPER

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 “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 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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