WACKER Group PDI 2, Repair Manual

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Disassembly/Assembly Procedures PD Repair
wc_tx000590gb.fm
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5.4 Replacing the Flapper Valve
See Graphic: wc_gr003452
There are flapper valves located on both the inlet and the outlet sides
of the pump. The procedure for replacing either flapper valve is the
same.
Removal:
5.4.1 Turn off the engine.
5.4.2 Remove the screws (a) and washers that secure the port (b or c) to the
pump water box and remove the port.
5.4.3 Remove the flapper valve (d).
5.4.4 Remove the large and small weights (e and f) from each side of the
flapper valve.
Installation:
5.4.5 Install the weights (e and f) to the flapper valves (d) with screws (g).
CAUTION: Do not over-tighten the screws. Over-tightening will crush
the rubber flapper and may prevent it from sealing properly. Tighten
the screws just so the rubber begins to compress.
5.4.6 Using the dowel pins (h) as a guide, install the flapper valve
assemblies to the pump with the small weight toward the intake side of
each valve.
5.4.7 Secure the port (b or c) to the pump with the screws (a) and washers.
Torque the screws to 22–27 Nm (16–20 ft.lbs.).