WIL-11113-E-04
Wilden
®
15
Disassembly / Reassembly
Step 10
Inspect the diaphragm assembly for
wear, damage or chemical attack.
Replace any damaged components with
genuine Wilden parts for reliable
performance,
Step 11
To remove diaphragm assembly from
shaft, secure shaft with soft jaws
(aluminum, plastic or plywood) to
ensure the shaft is not damaged. Using
an adjustable wrench, remove the
diaphragm assembly from the shaft.
Step 12
Remove outer piston and stud if equipped.
Inspect for wear and replace if necessary.
Step 13
Locate the outer piston on the side of
the amplification chamber has an air
passageway at the center of the outer
piston lug. This air passageway allows
air to flow from the opposite air chamber
to the amplification chamber. This
principle is how the HS430S high-
pressure pump achieves a 2:1 ratio of
inlet air pressure to discharge pressure.
Step 14
When reassembling the HS430S pump, the outer piston (with the air passageway) has to be
positioned on the same side as the amplification chamber. If it is not reassembled correctly,
the pump will not operate and process fluid will enter the air distribution system through the
air passageway located at the shaft lug.
This same air passageway continues through the diaphragm shaft, exits out of the diaphragm
shaft via a 90º turn and into the air chamber located on the wetted side of the pump. The air
passageway has to be positioned in the air chamber on the wetted side of the pump, opposite
the amplification chamber.
