5
2024 series Pneudraulic Installation Tool (HK1077)
PUll STrOKe
When tool is connected to the air supply, the air
pressure holds the throttle valve in the up (RETURN)
position; air pressure is directed to the top of the air
piston, keeping it down. When the trigger is pressed,
the throttle valve moves down to the PULL position,
and pressurized air is directed to the bottom of the air
piston, causing it to move upward (see above). The air
above the air piston is exhausted and directed through
the center of the throttle valve and out the bottom of
the tool (through the muffler).
As the hydraulic piston rod moves upward, a column of
pressurized fluid is forced into head, which moves the
pull piston rearward. The attached nose assembly moves
with the pull piston to start fastener installation.
reTUrn STrOKe
When fastener installation is completed, the trigger is
released. Air pressure, with the assistance of a spring,
sends the throttle valve to the up (RETURN) position.
Pressurized air is re-directed to the top of the air piston
(see above), causing it and the hydraulic piston rod to
move downward.
The air from below the piston is exhausted through the
bottom of the tool. The piston and hydraulic piston rod
move downward, hydraulic pressure is reversed, and
the pull piston is returned forward. The damper valve
impedes oil flow at pinbreak helping prevent “Tool Kick”.
Principle of Operation
Figure 1b
Figure 1a