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Old 04-15-2013, 01:38 PM   #1
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Macerator Question

My forward macerator for the head is not working properly.
When I flip the switch, sometimes I have to wait about 10 – 20 seconds for it to start up. The motor turns very slow for a while then it will kick up to speed – most of the time. Some times I have to ‘jump start’ it using a cordless screwdriver. I changed the impeller which actually looked like new and did not see anything blocking it like hair or string. It is doing the same thing with the new impeller kit.
It is a 12V Jabsco. I did not check the voltage under load yet. Is there some kind of grease or lubrication area that I overlooked?
Could the motor just be worn out?
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Old 04-15-2013, 02:09 PM   #2
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First thing, I would check the voltage under load, that is when you first turn the switch on. Test right at the splice points where the wires connect.

The symptoms sound a lot like low voltage. If you keep using it like this, you could burn the motor out.
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Old 04-15-2013, 02:25 PM   #3
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My forward macerator for the head is not working properly.
I replaced a macerator pump twice. Both timed it failed in a manner similar to yours. Then I replaced it with a Sealand T-Type pump. No failures in 6 years. Replacing black water pumps is a, ahem, shitty job, and the extra cost for the Sealand pump is a small price to pay.

Amazon.com: SeaLand T-Series Sanipump Discharge and Macerator Pump with Whisper Quiet Motor T12 12V: Sports & Outdoors

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Old 04-15-2013, 02:34 PM   #4
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Tony: I've never particularly liked the Jabsco Macerators for one of the problems you're having. There are cheap but don't seem to last. If you can get it working, great, but if you have to replace it, try a Seland T Series Waste Discharge Pump. They can run dry for extended periods and are unaffected by feminine hygiene products. It will last for years. On 2 different boats, over 15 year period, we have never had one fail or need servce.
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Old 04-15-2013, 04:11 PM   #5
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Sound like you need to replace the motor/macerator. In 16 years had to replace the motor twice. If you don’t use very often might want to take a hammer and tap the out side of the motor. I have to that for the mast/boom winch motors. You could also have the motor rebuilt at a local motor repair shop. West marine sell motor for about 150 bucks. f you flush the toilet with Clorox, rinse and wet vac out the toilet, its not very messy smelly. Its 4 bolts, take a couple of minutes. For the cost of one Sealand you can replace motor twice.
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Old 04-15-2013, 04:23 PM   #6
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We have Jabsco macerator pumps to pump our holding tanks overboard (where it's legal). I replumbed the aft system, the one that gets used the most, so I can pour fresh water into the plumbing to the pump and run it through. So after using the pump I run a bucket of fresh water through the pump and overboard. I don't know if this really makes any difference but our pumps last about six or seven years where other people we know who have the same pump only get two or three years out of them.

But previous posters are right--- if you have the space and plumbing configuration to install a good diaphragm pump, that is a far better setup than a flexible impeller pump for waste.
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Old 04-15-2013, 04:55 PM   #7
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It would be foolish to replace the pump without first making sure it has adequate electrical power to operate. That's troubleshooting 101.

BTW: My boat has a Jabsco or one that looks just like it. I have no reason not to believe it's original to the boat (yr 2000), but I've had the boat since 2008 and my macerator pump is working just fine.
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Old 04-15-2013, 05:21 PM   #8
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It would be foolish to replace the pump without first making sure it has adequate electrical power to operate. That's troubleshooting 101..
My boat was splashed in Oct- 2004 (2005 model) and the jabsco woks just fine with little to no maintenance.
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Old 04-15-2013, 05:23 PM   #9
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It would be foolish to replace the pump without first making sure it has adequate electrical power to operate. That's troubleshooting 101..
My boat was splashed in Oct- 2004 (2005 model) and the Jabsco works just fine with little to no maintenance.
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Old 04-15-2013, 09:35 PM   #10
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Sounds like voltage.

A little tip is the extended warranties they always try to sell us but are a huge money maker for them. When you buy a pump at WM buy the warranty! The warranty even covers replacing the impellers. You will get your money back. If you use your boat then the pumps/impellers will fail in the three years the warranty covers.
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Old 04-16-2013, 06:50 AM   #11
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You might consider a replacement that is a few steps up on the quality (and of course co$t) .

Obendorfer has such units as does Galley Maid. , under a boat buck.

Weather its worth the buck$ a decade before you revisit the poop pump is a personal choice
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Old 04-16-2013, 08:59 AM   #12
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Two for sale here at a good price.

For Sale: 2 Brand new Jabsco 18590-2092 Macerator Pumps - Cruisers & Sailing Forums
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Old 04-16-2013, 09:41 PM   #13
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I'd follow Ron's recomendation to check the voltage first. If the pump has power, then it's likely that the motor is going. The Jabsco 18590-2092 sells for less than $140.00. I'd just replace the whole thing rather than try to change the motor.

The suggestions to upgrade to a diaphram pump are good as well. Just takes money.
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Old 04-17-2013, 12:12 AM   #14
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Hey guys...he's asking about a macerating toilet pump, not an overboard discharge macerator pump.

(I've retired from online participation...I've GOTTA stop lurking!)
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Old 04-17-2013, 02:49 AM   #15
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I'm glad you're here! I give you a thought every now and then. The forum just feels complete when you lend a hand!
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Old 04-17-2013, 03:15 AM   #16
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I'm glad you're here! I give you a thought every now and then. The forum just feels complete when you lend a hand!
Yes, one of the most important services in a civilised society is good waste management, and I mean that in the nicest possible way.
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Old 04-17-2013, 09:53 AM   #17
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Hey guys...he's asking about a macerating toilet pump, not an overboard discharge macerator pump.

(I've retired from online participation...I've GOTTA stop lurking!)
Hey Peggy, glad you are here. Is it alright to use vinegar or Oderless in the system with a hold and treat Purasan?
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Old 04-17-2013, 10:44 AM   #18
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Yes. Distilled white vinegar works best...and the product is called Odorlos. You can safely combine them. RV supply store prices are typically a lot lower than marine sources.

Bye, y'all...
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Old 04-17-2013, 02:01 PM   #19
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Nice to see you Peggie......dont ......go........
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Old 04-17-2013, 05:33 PM   #20
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Yes. Distilled white vinegar works best...and the product is called Odorlos. You can safely combine them. RV supply store prices are typically a lot lower than marine sources.

Bye, y'all...
Thanks Peggie. We miss you.
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