WACKER Group 0007659, Repair Manual

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Disassembly/Assembly Procedures PG Repair
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5.8 Replacing the Flapper Valve
See Graphic: wc_gr003497
The flapper valve (1) is located at the pump inlet (2). During operation,
this valve is open allowing a free path for water to flow into the pump
case. When the pump is stopped, it closes and prevents water in the
suction line from being lost.
A leak around the flapper gasket will cause the suction line to lose its
prime and make the pump difficult or impossible to operate.
Removal:
5.8.1 Remove the three screws (3) that secure the suction (inlet) port (2) to
the pump.
5.8.2 Remove the inlet port and flapper valve assembly (1).
Installation:
5.8.3 Install the new flapper valve assembly (1) with the large washer (4)
facing the suction port. This washer acts as a counterweight and helps
seal the flapper gasket against the pump inlet when the pump stops.
5.8.4 Mount the suction (inlet) port (2) to the pump. Tighten the screws (3)
evenly until the flapper gasket begins to compress. Use Loctite 243 or
an equivalent medium-strength threadlocker on the screws.
NOTICE:
DO NOT overtighten the screws. Overtightening may distort
the flapper gasket causing an air leak at the suction (inlet) port.
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2
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