Shurflo macerator pump failed after a couple years, maybe a couple dozen discharges. Just slowed down, like it was working harder and harder, then stopped.
Since we have a second holding tank
aft with a Whale diaphram pump, we mostly used that and just arranged for pumpouts of the forward tank when needed.
I finally tackled the project
recently. No small task as we buried the pump in lots of other plumbing
(mistake #1) and it was inline with the bottom of the tank(partial mistake #2.) So even after doing a very thorough pump out, there was a quart or so of leftover in the lines, yummy!
Anyhoo, got it out and am trying to get it apart a) to try to figure out why it failed and b) if I decide to keep it to rebuild
The three philips head
bolts which hold the case together aren't budging. Drenching the seam between the plastic pump housing and the metal motor
case with penetrating oil
for several days and increasing vigorous "taps" with my impact driver. Nada.
So here are the questions:
Is this particular difficulty related to taking apart a Shurflo?
Are the bolts seized because the pump was continuously bathed in effluent because of its mounting location? Should all pumps be located above the top of the tank. (I don't believe there is anything in the manual about that.)
Some would say, oh just chuck it and get a new one. In that case I'll cut it apart with my grinder to try to determine the cause of failure.
I would put a second Whale pump in here in a heartbeat but that would require some material reconfiguration of the plumbing
due to the profile of the Whale. This is one piece of boat equipment
we all love to hate.
Any suggestions or commiserations appreciated!