200 Series Tooling Alcoa Fastening Systems
7
P
P
RINCIPLE
RINCIPLE
OF
OF
O
O
PERATION
PERATION
Operation as A Double Action Tool
When the tool is connected to an air supply and
the trigger (3-31) is depressed, air pressure acts on the air piston (3-44) and moves it for-
ward. This causes the small hydraulic piston (3-40) to act on a volume of hydraulic fluid in the
handle assembly (1-4). Pressurized fluid is forced into the head assembly (1-1) to move the
pull piston (2-21) in conjunction with the nose assembly to start the fastener installation.
Pressurized fluid is also acting on the shift piston (2-12) and shift valve (4-19), whose shift
force is controlled by the shift spring (4-29) and adjustment of the shift valve adjusting screw
(4-30). As the fluid pressure increases, the shift valve opens and allows the fluid resisting
movement of the shift piston (2-12) to exhaust. The shift piston moves forward and acts on
the thrust bushing and inner anvil of the nose assembly to drive the lock of the fastener.
Continued travel of the air piston increases the hydraulic pressure, causing the pull piston to
continue its travel. This causes the pintail of fastener to break off and the installation is com-
plete. ‘the trigger is released and all components return to their original position and the cycle
is complete.
Operation As A Single Action Tool
The tool operates the same for installing other
blind rivets and HUCKBOLT® Fasteners except
that the shift valve mechanism does not have a
function.
CAUTION
REASONABLE CARE OF INSTALLATION TOOLS BY OPERATORS IS AN IMPORTANT FACTOR IN MAIN-
TAINING TOOL EFFICIENCY AND IN REDUCING DOWN-TIME.
DO NOT ABUSE THE TOOL BY DROPPING IT, USING IT AS A HAMMER OR OTHERWISE CAUSING
UNNECESSARY WEAR AND TEAR.
BE SURE THERE IS ADEQUATE CLEARANCE FOR THE TOOL AND OPERATOR’S HANDS BEFORE PRO-
CEEDING.
THE PINTAIL DEFLECTOR MUST ALWAYS BE IN PLACE BEFORE USING THE TOOL.
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