Hello Peggie, After lubrication, Jabsco manual head pump quickly (a week or so) develops lots of friction or resistance and becomes hard to pump again. I followed your previous recommendations and obtained SuperLube Teflon grease, and applied it liberaly to the pump rid O-ring and to the piston bore, and it works like a charm, but only for a while. Is there a "Plan B"? Thanks.
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Tank vent is the first thing to check...
If it's open, the other most likely source of your problem is a failed wet/dry valve--which isn't actually a valve, but a little gate (Jabsco calls it a cam) that the lever swings to block and unblock the flow of incoming flush water. Due to either a tooling or mfr'g defect, that little gate has a nasty tendency to hang, creating a feeling of backpressure that many owners mistake for a clog. Greasing the toilet prob'ly un-hung it briefly. This is a VERY common problem in Jabsco toilets made in the last 7-8 years...one that Jabsco doesn't seem inclined to fix...at least not until the mold in which that little gate is made wears out...if then. Do yourself a HUGE favor: bite the bullet and replace that hunk of junk with a Raritan PH II...or PHC, which is the same pump on a compact base, if the full size PH II won't fit in your head.
If it's open, the other most likely source of your problem is a failed wet/dry valve--which isn't actually a valve, but a little gate (Jabsco calls it a cam) that the lever swings to block and unblock the flow of incoming flush water. Due to either a tooling or mfr'g defect, that little gate has a nasty tendency to hang, creating a feeling of backpressure that many owners mistake for a clog. Greasing the toilet prob'ly un-hung it briefly. This is a VERY common problem in Jabsco toilets made in the last 7-8 years...one that Jabsco doesn't seem inclined to fix...at least not until the mold in which that little gate is made wears out...if then. Do yourself a HUGE favor: bite the bullet and replace that hunk of junk with a Raritan PH II...or PHC, which is the same pump on a compact base, if the full size PH II won't fit in your head.
I had a Jabsco rep recomend
I have a similar problem, while at a boat show a met a Jabsco rep that looked like he had been around a while. My head works great for 20 flushes or so then the plunger gets tight. He told me to just pour a cap of vegetable oil in the pot and flush once a week. I have done this ever since and all has worked great. Harmless to the environment, takes only seconds and cheap.
I have a similar problem, while at a boat show a met a Jabsco rep that looked like he had been around a while. My head works great for 20 flushes or so then the plunger gets tight. He told me to just pour a cap of vegetable oil in the pot and flush once a week. I have done this ever since and all has worked great. Harmless to the environment, takes only seconds and cheap.
as peggy said
the wet dry valve likes to back off a little and back pressure the pump. make sure it is in the correct position. Sometimes you have to hold it in the dry position as you pump. I keep an old dish soap container filled with vegetable oil in the head and give it a squirt when it gets stubborn, you definately don't need to flush a cup of it, just a small squirt works wonders. I've even used bacon grease but its probably not recommended.
the wet dry valve likes to back off a little and back pressure the pump. make sure it is in the correct position. Sometimes you have to hold it in the dry position as you pump. I keep an old dish soap container filled with vegetable oil in the head and give it a squirt when it gets stubborn, you definately don't need to flush a cup of it, just a small squirt works wonders. I've even used bacon grease but its probably not recommended.
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