Dover Wilden Original P1, Engineering, Operation & Maintenance, Page: 19 / 28

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ASSEMBLY:
Upon performing applicable maintenance to the air distribution
system, the pump can now be reassembled. Please refer to
the disassembly instructions for photos and parts placement.
To reassemble the pump, follow the disassembly instructions in
reverse order. The air distribution system needs to be assem-
bled first, then the diaphragms and finally the wetted path.
Please find the applicable torque specifications on this page.
The following tips will assist in the assembly process.
• Clean the inside of the center section shaft bore to ensure
no damage is done to new seals.
• Stainless bolts should be lubed to reduce the possibility of
seizing during tightening.
• Level the water chamber side of the intake/discharge mani-
fold to ensure a proper sealing surface. This is most easily
accomplished by placing them on a flat surface prior to
tightening their clamp bands to the desired torque (see this
page for torque specs).
• Be sure to tighten outer pistons simultaneously on PTFE-
fitted pumps to ensure proper torque values.
• Ensure proper mating of liquid chambers to manifolds prior
to tightening vertical bolts. Overhang should be equal on
both sides.
• Apply a small amount of Loctite 242 to the shaft interval
threads before the diaphragm assembly.
• Concave side of disc spring in diaphragm assembly faces
toward shaft.
MAXIMUM TORQUE SPECIFICATIONS
Description of Part Plastic Pumps
Air Valve, Pro-Flo
®
3.1 N•m (27 in-lbs)
Outer Piston 14.1 N•m (125 in-lbs)
Small Clamp Band 1.7 N•m (15 in-lbs)
Large Clamp Band (Rubber-Fitted) 7.3 N•m (65 in-lbs)
Large Clamp Band (PTFE-Fitted) 9.6 N•m (85 in-lbs)
Vertical Bolts (Rubber Fitted) PVDF 5.6 N•m (50 in-lbs)
Vertical Bolts (PTFE Fitted) PVDF, PFA 2.8 N•m (25 in-lbs)
Vertical Bolts, all Polypropylene 9.0 N•m (80 in-lbs)
WILDEN PUMP & ENGINEERING, LLC
WIL-10140-E-08
S e c t i o n 5
R E A S S E M B L Y H I N T S & T I P S