> Bob,
>
> The original Hundred pump (both BN1 and BN2) was a special HP unit (high
> pressure) with a longer solenoid barrel and diaphragm stem. It had a metal
> tag fastened to the body stating "This pump is a high pressure pump and is
> approximately 1/2" longer than the normal Type L pump. It should only be
> replaced by a similar high pressure pump". (see picture).
> The new pump should work just fine but it may explain the erratic beating
> you are experiencing.
> However, you may want to remove the 6 screws around the pump body to
> solenoid flange and rotate the diaphragm stem one hole further in or out
> to
> achieve optimum action. As often as not, these pumps straight out of the
> box
> may not be set to do their best action and need slight adjustment.
>
> Rich
[demime 1.01d removed an attachment of type image/jpeg which had a name of
feb082 009.jpg]
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