[RE-wrenches] Shurflo pump

Tue May 31 22:54:35 PDT 2016

Mac,
My experience is similar but slightly different. I have worked with the 
Shurflo 9300 for nearly twenty years. I have closely followed the mfgr's 
directions - even the temporary wrap of tape - and as far as I can 
recall have had maybe one failure due to water penetration at the cable 
gland. But I have seen a number of homeowner installs with this failure, 
so it's easy to not get right. I agree that a fixed, sealed pigtail 
would be a better approach, like a SunRotor, Grundfos or Lorentz.

The 9300 has a one-year warranty as I recall. Running open discharge 
without float or time control, such as all day into a wildlife pond with 
overflow, the pumps last about 1 1/2 years before needing the 
diaphragm/drive kit and valve kit for a minor rebuild. If water never 
reaches the motor, it will last through several of these lifetimes, but 
usually folks don't do the service until the pump stops, and often a 
failed diaphragm leads to water reaching the motor. But I have seen many 
of these pumps go five or more years of intermittent duty needing nothing.

And the pump will run at less than half speed on a 12V battery. Standard 
DC brush motor - speed and thus output vary directly with voltage.
Allan

*Allan Sindelar*
allan at sindelarsolar.com <mailto:allan at sindelarsolar.com>
NABCEP Certified PV Installation Professional
NABCEP Certified Technical Sales Professional
New Mexico EE98J Journeyman Electrician
Founder (Retired), Positive Energy, Inc.
*505 780-2738 cell*

**

On 5/31/2016 1:30 PM, Mac Lewis wrote:
> Hi Drake,
>
> I'll second Kevin's suggestion that it may be the waterproofing 
> gland.  I see this as a very weak part of this pumps design and won't 
> ever use that pump again because of it.  The aquatec SWP-4000 is a 
> very similar pump.  Pump manufacturers should take responsibility for 
> the water-proofing into their unit.  Under water splices are super 
> easy compared to the gland/grease mess routine required with these pumps.
>
> As Kevin suggested, bypass the controller and put good ~ 24VDC down 
> there (using batteries off of your cordless tools works well for this) 
>  These pumps will pump off 18-20V.
>
> Good luck
>
> On Tue, May 31, 2016 at 10:58 AM, Kevin Pegg 
> <KPegg at energyalternatives.ca <mailto:KPegg at energyalternatives.ca>> wrote:
>
>     Hi Drake,
>
>     We have a lot of these pumps in the field, operating without issue
>     for many years, though they are generally operating on some sort
>     of regular basis. But lots of customers with seasonal situations
>     that may have the pump idle for 10 months a year.
>
>     I would suggest applying 12/24VDC battery power directly to the
>     pump bypassing controller and see if you get any action, then can
>     narrow down if it is a pump issue or a controller issue. Another
>     issue is the waterproof gland if not done properly can result in
>     connection issues. Have had a few of those.
>
>     Kevin
>
>     *From:*RE-wrenches
>     [mailto:re-wrenches-bounces at lists.re-wrenches.org
>     <mailto:re-wrenches-bounces at lists.re-wrenches.org>] *On Behalf Of
>     *Drake
>     *Sent:* May-31-16 8:27 AM
>     *To:* RE-wrenches <re-wrenches at lists.re-wrenches.org
>     <mailto:re-wrenches at lists.re-wrenches.org>>
>     *Subject:* [RE-wrenches] Shurflo pump
>
>     Hello Wrenches,
>
>     A couple years back we installed a Shurflo 9325-043-101 water
>     pump. It runs array direct. After installation, it worked fine.
>     Since then, it  has not been used. The client tried to operate it
>     recently,and it didn't work. A red light is showing in the controller.
>
>     How well do these systems hold up if not used?
>
>     I haven't gone out to the site yet, but wanted to get some
>     background from you water pumping guys about shelf life of idle
>     systems.
>
>     Thanks,
>
>     Drake
>
>     Drake Chamberlin
>     /Athens Electric LLC
>     OH License 44810
>     CO License 3773
>     NABCEP Certified Solar PV
>     740-448-7328 <tel:740-448-7328>
>     /http://athens-electric.com/
>
>
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> -- 
>
>
>
> Mac Lewis
>
> *
>
> "Yo solo sé que no sé nada." -Sócrates
>
> *
>
>
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