Our Smart Sensor water pump, #4900-0201, cycles briefly every 30 seconds or so. It is a short burst each time, approximately 1 second. I assume there is some grit in one of the valves or something similar, but have not purchased any repair parts or torn it down yet. Anyone have some guidance on this. We are on the road so I want to only pull the pump one time to make the fix if I can. Maybe I don't need new parts, rather clean it out?

It sounds like you have a leak. If you can not find one in the plumbing it may be a leaking check valve in the pump.

dbbls wrote:It sounds like you have a leak. If you can not find one in the plumbing it may be a leaking check valve in the pump.As just said, you described a classic sign of a water leak. Time to trace out all water lines.

You have a small leak.......could be at a fitting, could be toilet water valve, could be dripping faucets/shower head, could be drip at low point drains, could be dripping at 'city water' inlet check valve, could be water heater PRV weeping etc.Could be pump diaphragms have debris/scale built up.....that pump doesn't have an internal check valve just 4 pump diaphragms.Spec sheet/parts......LINK

If you have a whole house filter and it is getting plugged it will do the same thing. Easy..change the filter. If not...all the advice above is good. :) :)

I neglected to mention that I have found no evidence of any water leakage, at least nowhere I can get access to. But that does give me an idea to stop at a hardware store and buy a 1/2" MPT cap to put on the pump outlet and eliminate any chance of system leakage beyond the pump. There is no system filter, the tank is right next to the pump, I can see the entire 15" supply line, and the screen in the intake bowl is clear. So the problem will be in the pump itself.

Cycling Shurflo Smart Sensor pump | Good Sam Community

StuartT
Explorer
Jun 08, 2014
Purchased the cap last night and will block off pump outlet today and see if cycling stops. Will then know if problem is in the delivery system or the pump. Will advise.
StuartT
Explorer
Jun 08, 2014
Okay, the cycling continued with the output capped off. Problem is in pump. So has anyone been inside a Smart Sensor pump and been able to clean out the valves, passages, etc. and restore it to satisfactory working order?
flapbreaker
Explorer
Jun 08, 2014
StuartT wrote:
Okay, the cycling continued with the output capped off. Problem is in pump. So has anyone been inside a Smart Sensor pump and been able to clean out the valves, passages, etc. and restore it to satisfactory working order?

I had the 5.7 model. I ordered a new valve assembly for $40 but unfortunately it still leaked backwards so I had to replace the entire pump. Sucks to have wasted forty bucks on valves. I replaced mine with the Remco 55AQUAJET-ARV Aquajet RV Variable Speed Water Pump.
StuartT
Explorer
Jun 08, 2014
flapbreaker wrote:
StuartT wrote:
Okay, the cycling continued with the output capped off. Problem is in pump. So has anyone been inside a Smart Sensor pump and been able to clean out the valves, passages, etc. and restore it to satisfactory working order?

I had the 5.7 model. I ordered a new valve assembly for $40 but unfortunately it still leaked backwards so I had to replace the entire pump. Sucks to have wasted forty bucks on valves. I replaced mine with the Remco 55AQUAJET-ARV Aquajet RV Variable Speed Water Pump.

And are you happy with that new pump?
flapbreaker
Explorer
Jun 09, 2014
StuartT wrote:
flapbreaker wrote:
StuartT wrote:
Okay, the cycling continued with the output capped off. Problem is in pump. So has anyone been inside a Smart Sensor pump and been able to clean out the valves, passages, etc. and restore it to satisfactory working order?

I had the 5.7 model. I ordered a new valve assembly for $40 but unfortunately it still leaked backwards so I had to replace the entire pump. Sucks to have wasted forty bucks on valves. I replaced mine with the Remco 55AQUAJET-ARV Aquajet RV Variable Speed Water Pump.

And are you happy with that new pump?

Yes I am. It was the closest thing to the Smartflo 5.7 that I could find as far as variable flow and lots of it. The cheapest place I found it was on a site called freshwatersystems.com sells for $156 you can read reviews on it there.

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