15
WILDEN PUMP & ENGINEERING, LLC
WIL-10060-E-03
Figure 1
CAUTION: Before any maintenance or repair is attempted,
the compressed air line to the pump should be discon-
nected and all air pressure allowed to bleed from the
pump. Disconnect all intake, discharge and air lines. Drain
the pump by turning it upside down and allowing any fluid
to flow into a suitable container. Be aware of any hazard-
ous effects of contact with your process fluid.
The Wilden model A2 is an air-operated, double-dia-
phragm pump with wetted parts of aluminum, stain-
less steel and Alloy C. The single-piece center section,
consisting of center block and air chambers, is molded of
polypropylene or aluminum. All O-rings used in the pump
are of a special material and shore hardness that should
only be replaced with factory-supplied parts.
TOOLS REQUIRED:
Adjustable Wrench
9/16" Box Wrench
3/4" Box Wrench
3/16" Hex Wrench
Vise equipped with soft jaws (such as plywood, plastic
or other suitable material)
NOTE: The model used for these instructions incorporates
PTFE diaphragms, balls and seats. Models with rubber
diaphragms, balls and seats are the same except where
noted.
DISASSEMBLY:
Step 1.
Before starting disassembly, mark a line from each liquid
chamber to its corresponding air chamber. This line will assist
in proper alignment during reassembly.
Step 2.
Figure 2
Using a 3/16” Hex wrench, remove air
valve bolts. Inspect air valve assembly
for wear or damage.
Step 3.
Figure 3
Utilizing the 9/16" box wrench, start by
removing the four long carriage bolts
that secure the top and bottom mani-
folds to the center section.
Step 4.
Figure 4
Remove the top manifold and lift the
center section off the inlet manifold.
S e c t i o n 8
P U M P D I S A S S E M B L Y
