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 Marine Sanitation, Plumbing and the like.
 Raritan Crown Head - Spring Commissioning

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T O P I C    R E V I E W
Vic Willman Posted - Jun 07 2006 : 10:15:02
I get a lot of calls and questions about why a Crown Head will not bring in outside rinse water when the head is being used for the first time in the spring - even though it had worked perfectly well in the fall. There's a very simple procedure to follow, when using the head for first time for the season, that can save you a lot of aggravation (and expense). If the head is mounted conventionally, with the large round inspection/cleanout cover in the front, look at the very rear of the head. On the right-hand side is the incoming water line from outside. First turn off the supply water seacock, then remove this hose. After removing the hose, poke the eraser end of a pencil into the nozzle that the hose had been connected to.

Inside this nozzle is a black rubber ball and spring. They constitute a check valve that keeps a small amount of water inside the pump at all times, to aid it in priming itself. But, after sitting all winter with the spring pressing against the ball, this ball has a tendency to stick to its seat. As the motor runs, and the impeller inside turns, they don't always generate enough suction to unseat this ball from the seat. So, the impeller is turning inside the pump, but the ball is stuck, so no water can come in. As the impeller turns inside the pump, it heats up the inside of the pump from friction, burning out the impeller, and - if you run it long enough (more than about 15 seconds), it will actually melt the inside of the plastic pump housing, ruining it.

So, before you run a Crown Head for the first time every season, ALWAYS remove the supply water hose and unseat the rubber ball inside the pump! This may seem like a pain in the butt to do each spring, but as an incentive to do this, should you burn out the pump by running it dry, Raritan's current price for a replacement raw water pump assembly for a Crown Head is $163.38 + shipping...(2009 price is $180.55 + shipping)

In some installations, the pump/motor assembly of the Crown Head is mounted sideways and the toilet bowl and seat are rotated 90ļ - which will put the referenced cleanout/inspection cover on the right-hand side, and the referenced hose and nozzle in the rear, on the left side. This is often done when the head is mounted on a "step" to clear the curvature of the hull, etc.

6   L A T E S T    R E P L I E S    (Newest First)
cwms Posted - Jul 21 2019 : 07:23:40
When was the last time you pumped out your holding tank? When you say it hums, is it the same sound you normally hear or is it different.
Bruce Herrington Posted - Jul 20 2019 : 06:35:11
Hello Trina.
This is the correct forum. If you donít get an answer today, post your question in the Ask The Captain forum.
Trina Wilson Posted - Jul 20 2019 : 00:01:30
This is my first time on here so I hope I am doing this correctly? My friend, more like a dad, helped me with buying my Cruise A Home and was teaching me things about boating. However a year later he got brain cancer and died. Now I don't have anyone to ask so I am hoping maybe this is the best place? Of several issues I have right now, the toilet will not flush. It did once and later when I went to flush it later that day, it hums but no water and no flushing. There is paperwork for Raritan and Par Model 37010 series on the boat. I am mechanically inclined, I'm just scared to do much for fear of sinking my boat. Can anyone help?
Vic Willman Posted - May 04 2009 : 14:44:03
Dalehollow, this is sure a fine time to be answering your last posting (nearly 2 years later) but on most houseboats, the head is mounted above the waterline of the boat. In above-waterline installations, it isn't necessary to keep the ball and spring inside the pump - they serve no real useful purpose.

But in below-waterline installations, the ball and spring must be retained, or you will have the possibility of unwanted water coming into the toilet bowl, overflowing it, and and possibly sinking the boat.

dalehollow Posted - Aug 08 2007 : 09:12:45
Hi Vic when this season is over Ill owe you a lot IM so new, bought first HBoat. has the crown head, sitting for a long time no use, I replaced the impellar after multiple try's of every which way of pouring water in sucking water out the only way i could make the unit work was by removing the black ball, even after putting a new ball in. Understanding it was there as you stated to maintain the prime, but even after a week or so off the boat it would still operate w/out needing to be reprimed, B4 it Wouldnt let water come into the bowl with black ball ui.

Perhaps the spring was too stought your thoughts
C team Posted - Apr 05 2007 : 05:36:29
Great advice Vic! I learned this the hard way last season. I could not believe how the impeller burned the pump housing. I kept the old housing as a reminder. I should post a picture so everyone can see the damage that was done.

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