S e c t i o n 7
P U M P D I S A S S E M B L Y
TOOLS REQUIRED:
• 9/16" Wrench
• 3/4" Wrench
• Adjustable Wrench
• Vise equipped w/soft jaws (such
as plywood, plastic or other
suitable material)
CAUTION:
Before any maintenance or repair is attempted, the compressed
air line to the pump should be disconnected 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 hazardous effects of contact with your
process fluid.
NOTE:
All O-rings used in the pump are made of special material and at any
of sign of hardness should be replaced with only factory-supplied parts.
Step 1
Before starting disassembly, mark
a line from each liquid chamber to
its corresponding air chamber. This
line will assist in proper realignment
during reassembly.
Step 2
Using a 3/4" wrench, loosen the
discharge manifold from the liquid
chambers.
Step 3
Remove the discharge manifold to
expose the top-left valve ball.
NOTE:
The HS400S pump does not
use valve balls in the amplification
chamber.
Step 5
To ensure no excessive wear
or damage has occurred to the
amplification chamber plug O-rings,
remove plugs located between top
and bottom tee sections and elbows
(right side of pump only). Inspect and
replace seat plug O-rings if necessary.
Install Buna
®
O-ring on air side of plug
and the encapsulated Viton
®
O-ring on
liquid side of plug.
Step 6
Using a 3/4" wrench, loosen the inlet
manifold from the liquid chambers.
Step 4
Remove the discharge valve ball,
valve seat and valve seat O-ring
from the left liquid chamber and
inspect for nicks, gouges, chemical
attack or abrasive wear. Replace
worn parts with genuine Wilden
parts for reliable performance.
WIL-11112-E-01
10
WILDEN PUMP & ENGINEERING, LLC
