| Macerator problem [message #75313] |
Mon, 01 March 2010 20:06  |
Larry
Messages: 2875
Registered: January 2004
Location: Menomonie, WI
Karma: 10
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Senior Member |
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Turned on my Macerator tonight to empty the tank and it ran like the tank was empty and nothing coming out. I think something is plugged in it. Has anyone hooked up a hose to it and pushed water backwards through it to clear what ever is in there out?
Looks like I might have some dirty work coming up. Fortunately I put a gate valve in between the tank and the pump.
Thanks for the thoughts.
Larry 
78 Royale w/500 Caddy
Menomonie, WI.
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| Re: [GMCnet] Macerator problem [message #75325 is a reply to message #75317] |
Mon, 01 March 2010 20:45  |
Larry
Messages: 2875
Registered: January 2004
Location: Menomonie, WI
Karma: 10
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| GMCWiperMan wrote on Mon, 01 March 2010 20:23 |
Larry,
The vanes of the rubber impeller in the macerator pump should not allow
water to flow backward. WIth high enough water pressure, I'd guess you
might even cause the vanes to reverse their "lean back" and cause the motor
to stall (though probably less likely than if you turn the motor backward
with the slot in the end of the armature shaft). I suspect you're going to
have to use that gate valve. 
Ken H.
On Mon, Mar 1, 2010 at 9:06 PM, Larry <weidnerl@wwt.net> wrote:
>
>
> Turned on my Macerator tonight to empty the tank and it ran like the tank
> was empty and nothing coming out. I think something is plugged in it. Has
> anyone hooked up a hose to it and pushed water backwards through it to clear
> what ever is in there out?
>
> Looks like I might have some dirty work coming up. Fortunately I put a gate
> valve in between the tank and the pump.
>
>
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Humm, How about switching the leads around and running the pump backwards??
Larry
78 Royale w/500 Caddy
Menomonie, WI.
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| Re: [GMCnet] Macerator problem [message #75342 is a reply to message #75313] |
Mon, 01 March 2010 22:33 |
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USAussie
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma: 6
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Senior Member |
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Larry,
Here's a picture of the innards of the macerator with the inlet off. It
looks like if you hook up a hose to the discharge it should flow backwards
with no problem as the vanes are bent in the right direction.
As we say Downunder, "give it a go, Mate!"
http://www.gmcmhphotos.com/photos/showphoto.php?photo=30063
Regards,
Rob Mueller
Sydney, Australia
AUS '75 Avion-The Blue Streak TZE365V100428
USA '75 Avion-Double Trouble TZE365V100426
-----Original Message-----
From: gmclist-bounces@temp.gmcnet.org
[mailto:gmclist-bounces@temp.gmcnet.org] On Behalf Of Larry
Sent: Tuesday, 2 March 2010 1:06 PM
To: gmclist@temp.gmcnet.org
Subject: [GMCnet] Macerator problem
Turned on my Macerator tonight to empty the tank and it ran like the tank
was empty and nothing coming out. I think something is plugged in it. Has
anyone hooked up a hose to it and pushed water backwards through it to clear
what ever is in there out?
Looks like I might have some dirty work coming up. Fortunately I put a gate
valve in between the tank and the pump.
Thanks for the thoughts.
--
Larry :)
78 Royale w/500 Caddy
Menomonie, WI.
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_______________________________________________
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Regards,
Rob M. (USAussie)
The Pedantic Mechanic
Sydney, Australia
'75 Avion - AUS - The Blue Streak TZE365V100428
'75 Avion - USA - Double Trouble TZE365V100426
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| Re: Macerator problem [message #75360 is a reply to message #75313] |
Tue, 02 March 2010 07:38 |
fred v
Messages: 999
Registered: April 2006
Location: pensacola, fl.
Karma: 0
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mine acts like that and i just fill the discharge hose with water and it starts up. my setup has the pump above the 3" line so it has to lift to get started.
Fred V
'77 Royale RB 455
P'cola, Fl
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| Re: [GMCnet] Macerator problem [message #75364 is a reply to message #75361] |
Tue, 02 March 2010 08:16 |
Steven Ferguson
Messages: 3447
Registered: May 2006
Karma: 0
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Larry,
Rebuild kits are available for the Jabsco units.
On Tue, Mar 2, 2010 at 6:42 AM, Larry <weidnerl@wwt.net> wrote:
>
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> Thanks Ken, Rob,Dan and Fred,
>
> I'll try a few things and...I suppose...take it off...yuck!! We've been staying in a RV park for the last 3-4 dumps and have not pooped in it, so might not be too bad. Can you get impellers for that thing? Will I have to go to a Marine store to get it?
> --
> Larry :)
> 78 Royale w/500 Caddy
> Menomonie, WI.
> _______________________________________________
> GMCnet mailing list
> List Information and Subscription Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
--
Steve Ferguson
'76 EII
Sierra Vista, AZ
Urethane bushing source
www.bdub.net/ferguson/
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| Re: Macerator problem [message #75387 is a reply to message #75361] |
Tue, 02 March 2010 12:44 |
roy1
Messages: 2126
Registered: July 2004
Location: Minden nevada
Karma: 6
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Larry
If you can get a new one for a reasonable cost I would go that route, I put a rebuild kit in mine 2 years ago and found I had to add a thin piece of stainless also due to some wear in the housing that wasn't in the kit. This winter while camping near Quartsite a crack developed in the case causing it to drip. Probably because the old plastic is getting fatigued, a little epoxy stopped the leak.
Roy
Roy Keen
Minden,NV
76 X Glenbrook
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| Re: Macerator problem [message #75402 is a reply to message #75313] |
Tue, 02 March 2010 13:54 |
Larry
Messages: 2875
Registered: January 2004
Location: Menomonie, WI
Karma: 10
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Senior Member |
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Well, after trying several things, I decided to take it apart. Put the coach up, blocked it, and ran fresh water backwards through it so that if I had a spill the water would be a little cleaner. Pulled the pump off and took it apart to find nothing wrong. Hummm what now? Decided that as long as it was out of the way, I'd empty the tanks through the gate valve into a pan I had...one pan at a time. Pan was only a 3 gallon pan. Seemed like it was coming out kinda slow for what I thought was a full tank, so I poked a screwdriver up there...no change. So I shut off the gate valve and went topside to look down the toilet....sure enough, the tank was nearly empty. Seems I was trying to pump an empty tank dry.  The tank was nearly dry the first time I tried to empty it, so the pump only needed to take out a couple of gallons before it started to sound like it was empty. Each time after...when I was reverse flowing water up the hose, I was just piumping out the couple of gallons I put in during the reverse flow process. DAHHHH...Sigh.....
As long as I had it apart, I reversed the outlet of the pump housing so the pick-up was at the bottom. Put it back together....filled the waste tank half full of fresh water and tried it....Working fine.
Sometimes I'm such a DULT.....
Larry
78 Royale w/500 Caddy
Menomonie, WI.
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| Re: [GMCnet] Macerator problem [message #75449 is a reply to message #75436] |
Tue, 02 March 2010 19:28 |
Larry
Messages: 2875
Registered: January 2004
Location: Menomonie, WI
Karma: 10
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Senior Member |
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| WD0AFQ wrote on Tue, 02 March 2010 18:23 |
Larry, describe your feelings when you realized the tank was empty. Tell us why you admitted to it? I might have made something up and bragged about how good I was following everyone's suggestions.
Dan
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HRUMPH!!!
Larry
78 Royale w/500 Caddy
Menomonie, WI.
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