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General Discussion of preventative/corrective maintenance and other technical issues regarding your coach that are not covered in other Mechanic's Corner categories (ex. refrigerators, water heaters, and compressors).

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  #1  
Old 06-23-2012
mevans49083 mevans49083 is offline
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Default Jabsco Water Pump On and Off

I have a Jabsco 36950-2000 in our 1985 PT36 that has worked perfectly for us in the two years we have owned the bus, including 8 outings so far this year. Today, however, the pump started turning off and on when a faucet is opened. Water volume and pressure seem normal when the pump is running so I don't think I have any blockages or kinks, and the pump turns off when the faucet is closed, as it should. If I keep the water running, however, the pump now turns off along with a troubling "twang!) from the #2 post in the left rear load center. Is this symptomatic of a bad pressure switch that is drawing too much current, or are there any maintenance cleaning/adjusting items that I should try?

Thanks,
Mike
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Old 06-23-2012
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The Twnag sounds like an auto-reset breaker tripping (although I usually call it a 'clunk'). The pump could be drawing too much current, but since it seems to run ok, perhaps the breaker is weak. Can you put an ampmeter on the pump circuit to see if it is drawing too much current? The pressure switch just turns it on and off, it doesn;t really draw it's own current, it only passes the pump current along.
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Old 06-23-2012
mevans49083 mevans49083 is offline
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13.30V at rest, draws 19.5V when pump runs for a few seconds until the breaker kicks out.
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Old 06-23-2012
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The coach only provides 13.5 volts at most. Are you talking amps? There is no way you can get 19+ volts. ????
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  #5  
Old 06-23-2012
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Check your connections, if you used a wire nut it may came loose, mine did that last year and I crimped it and all is well.
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  #6  
Old 06-23-2012
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My two year old Jabsco pump is not providing as much punch as it used to. I was thinking of replacing it with another Jabsco pump that puts out 5 gpm at 60 psi max. Is that too much pressure for the Bluebird water system. The old pump was 25 psi max.

I was thinking this one:

http://tinyurl.com/7jbqaqr
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  #7  
Old 06-24-2012
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60 PSI is pretty high, I wouldn't go that high if is was mine. If you were happy with the original I would stick with those specs.
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Old 06-24-2012
83 bird 83 bird is offline
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Quote:
Originally Posted by gcyeaw View Post
60 PSI is pretty high, I wouldn't go that high if is was mine. If you were happy with the original I would stick with those specs.
I agree most residential pressure regulators are pre-set at 50 psl. If you take in the friction loss in the hose connection, your flow to the coach system would probably be somewhere around 40 psi. More pressure can create a water hammer in the plumbing system when valves are closed quickly, resulting in broken pipes
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  #9  
Old 06-24-2012
Clembo Clembo is offline
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First check out your acumulator. Sounds like the diaphram could have a hole in it or it has lost pressure.
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