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Old 08-09-2015, 00:10   #1
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Jabsco manual head problem

I have the small bowl Jabsco manual head that isn't working... the pump handle has extreme resistance when pushing down so it doesn't pump out and it also doesn't draw in water, just wondering if anyone has had this issue before and if someone could enlighten me on how to fix it? Is it obstructed? Or is it in some kind of winter mode?
Thanks
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Old 08-09-2015, 01:18   #2
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Re: Jabsco manual head problem

This may help:-



Sounds like a stuck non return valve.
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Old 08-09-2015, 08:50   #3
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Re: Jabsco manual head problem

Alrighty thank you, I may try this, also I have not found a tank so I don't think it has one? So this should make it simpler I hope
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Old 08-09-2015, 09:07   #4
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Re: Jabsco manual head problem

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Originally Posted by youngson View Post
I have the small bowl Jabsco manual head that isn't working... the pump handle has extreme resistance when pushing down so it doesn't pump out and it also doesn't draw in water, just wondering if anyone has had this issue before and if someone could enlighten me on how to fix it? Is it obstructed? Or is it in some kind of winter mode?
Thanks
Your problem isn't just failure to draw in flush water, so the video won't help (although y'all might want to keep it handy to use next spring when you toilets don't bring in flush water because you stored 'em with the wet/dry lever in the dry position).

You might consider lubricating the pump. Friction can make a pump very hard to pump. Put a couple of tablespoons--no more!--in the bowl and flush. If that helps, you just need to keep the pump lubricated. If it doesn't help, a blocked holding tank vent is the most likely culprit.

If you don't have a tank, sea mineral buildup in your head discharge line can reduce the diameter enough to block it.

A buildup on the joker valve can create a blockage (if you don't know what a joker valve is or where it's located see your toilet's owners manual
Jabsco 29090 -3000 Twist 'n' Lock manual toilet instructions

If none of the above, there is one more possibility that's plagued Jabsco manual toilet owners for a couple of decades: the wet/dry cam assembly in the pump has failed. It hangs up, creating resisitance that feels like back pressure. The only cure is a replacement wet/dry cam assembly. If that's the case, I'd just replace the pump...it won't cost you much more.
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Old 08-09-2015, 09:56   #5
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Re: Jabsco manual head problem

The last time I've seen this problem, it was a closed valve on the thru-hull
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Old 08-09-2015, 22:40   #6
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Re: Jabsco manual head problem

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The last time I've seen this problem, it was a closed valve on the thru-hull
Oh how you mock me...
Sadest part is I was trying to figure it out and upon further inspection I found that the thru-hull valves were indeed closed...
And there I was thinking I knew what I was doing but the simplest thing was the last thing I thought of.. Fail! Thanks for trying to help the helpless though.
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Old 09-09-2015, 08:25   #7
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Re: Jabsco manual head problem

There is an o-ring around the piston in the pump and another that is on the shaft that connects to the pump handle. You can order a rebuild kit for the pump assembly or a complete rebuild kit. In the pump kit you would get new o-rings and the lube for them. I think they are just dry and the o rings old and binding. Just an educated guess, did a total rebuild on my head about a year ago. Hope this helps
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Old 09-09-2015, 16:43   #8
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Re: Jabsco manual head problem

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Oh how you mock me...
Sorry for being such a smug weenie. The last time I had the same problem I did have the same problem. Hope this helps
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Old 09-09-2015, 20:29   #9
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Re: Jabsco manual head problem

Tear it down, rebuild it and replace all the hoses. Start fresh. Not that hard.
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Old 09-09-2015, 21:26   #10
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Re: Jabsco manual head problem

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Originally Posted by magellanyachts View Post
Tear it down, rebuild it and replace all the hoses. Start fresh. Not that hard.

Or if you had read the the whole thread - open the thru-hull.


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Old 09-09-2015, 22:58   #11
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Re: Jabsco manual head problem

Missed that little item. Very funny although we have all done similar things. Still recommend occasional rebuild and hose replacement.
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Old 09-09-2015, 23:51   #12
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Re: Jabsco manual head problem

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Sorry for being such a smug weenie. The last time I had the same problem I did have the same problem. Hope this helps
No problem, all in the name of fun
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