When the trigger is depressed the throttle valve
moves to down position, pressurized air is
directed to the bottom of the air piston, causing
the piston to move upward (Fig.1a). The air
above the piston is exhausted and directed
through the center of the throttle valve and out
the bottom of the tool. As the hydraulic rod
moves upward, a column of fluid is forced into
head, which moves the pull piston back. The
attached nose assembly moves with the pull
piston to start fastener installation.
When fastener installation is completed, the
trigger is released. Air pressure with the
assistance of a spring causes the throttle valve
to return to its up position. Pressurized air is re-
directed to the top of the air piston (Fig.1b),
causing the air piston and hydraulic rod to
move downward. The air from below the piston
is exhausted through the bottom of the tool.
Spring pressure returns the pull piston to its
home position. The damper valve impedes oil
flow at pinbreak helping prevent “Tool Kick”.
Fig. 1(a)
Fig. 1(b)
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