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Old 06-29-2021, 12:46 PM   #1
Ford Super Duty Owner
Join Date: Aug 2016
Location: Michigan
Posts: 59
Macerator pump

I've been using a Sewerflo RV macerator for pumping out holding tanks at home on occasion when the dump station line was long and it has worked well. However, this time I wasn't paying close attention and connected the 12v alligator clips to the battery in reverse polarity. I could hear air bubbling up the drain hose and holding tanks. Probably ran that way for a full minute before I realized my mistake. After correctly connecting to the battery I was able to complete the pumpout. Now I am wondering if my mistake might have damaged the impeller. Anyone else run their macerator pump backwards and did the pump survive?
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Old 06-29-2021, 03:21 PM   #2
"Formerly Diplomat Don"
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Newmar Owners Club
Join Date: Apr 2005
Location: Moorpark, Ca.
Posts: 21,887
Most of the macerators are a rubber blade with a cutter housing on one side. If it's fairly old and the rubber blade had a "set" to it, you could have damaged it. Obviously, if it still pumps the same, no damage. Most macerators have a rebuild kit that comes with a new impeller, blade and housing seal.
Don & Mary
2019 Newmar Dutch Star 4018 (Freightliner)
2019 Ford Raptor
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Old 06-29-2021, 03:31 PM   #3
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Location: Western NY
Posts: 5,640
Rubber impeller pumps are not meant to run dry... either direction. Hard to tell if any damage without disassembly. If it were me I would at least purchase a replacement impeller & gasket. Rebuild is not difficult to do if you experience / notice any reduced performance. Small pieces of impeller will result in reduced performance which is a clear sign it will continue to degrade and worth attention.
Don & Marge
'13 Newmar Ventana 3433 - '14 CR-V TOAD
'03 Winnebago Adventurer 31Y - SOLD
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ace, macerator, pump

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