Stenner pump pumping too much

pwlldvd

Member
Jun 26, 2014
10
Austin, Texas
I have a Stenner 45MHP10 pumping chlorine. It is maybe 3 or 4 years old, and other than replacing duck valves and pump tubes has been great.

Recently I found it pumping too much into the pool. I tried turning down the flow adjustment, but the adjuster ring seems to be stuck on about #3. When it runs, it pumps almost non-stop.

Any ideas what's wrong and if it can be fixed? I can always order a new pump but would prefer not.

Thanks

David
 

Bama Rambler

Mod Squad
TFP Expert
Bronze Supporter
LifeTime Supporter
Jun 22, 2009
23,493
SouthWest Alabama
They also have service manuals on their site. There are a few parts in the adjustable section.

If you look on page 41 of the Stenner service manual you'll see a breakdown of the parts. Since it doesn't appear to change rates when turning the dial, it's most likely the Variable Cam. If you look on page 24 of that manual it tells you that it's the Variable Cam either disengaged or broken.
 

pwlldvd

Member
Jun 26, 2014
10
Austin, Texas
They also have service manuals on their site. There are a few parts in the adjustable section.

If you look on page 41 of the Stenner service manual you'll see a breakdown of the parts. Since it doesn't appear to change rates when turning the dial, it's most likely the Variable Cam. If you look on page 24 of that manual it tells you that it's the Variable Cam either disengaged or broken.
Thanks! I was looking on the website for troubleshooting, but didn't see the manual. I'll check this out in the morning.
 

Bama Rambler

Mod Squad
TFP Expert
Bronze Supporter
LifeTime Supporter
Jun 22, 2009
23,493
SouthWest Alabama
If your cam is broken drop me a PM and I'll send you one. I should have a couple of spare parts since I've converted my adjustable rate pump to a fixed rate one.
 

pwlldvd

Member
Jun 26, 2014
10
Austin, Texas
Bama,

It was the cam. Not broken, but grooved and mangled. Too bad I didn't check the thread earlier, I already ordered a repair kit. The cam and lifter are pretty worn, and maybe could be reused, but it didn't cost much more for the kit than the cam alone.

Thanks for the help!

David
 

pwlldvd

Member
Jun 26, 2014
10
Austin, Texas
Replaced the cam, ring, and lifter. Works great! Actually it may be better than new. When new it made a ratcheting sound on lower setting. That's gone now.

Thanks for the help!
 

Bama Rambler

Mod Squad
TFP Expert
Bronze Supporter
LifeTime Supporter
Jun 22, 2009
23,493
SouthWest Alabama
I tied the pump into my home automation system where I have the ability to set the timer in one second increments, so I just set the adjustment dial to 10 and ran it on time. When I needed to replace a part on the pump, I just took that opportunity to remove the adjustable section of the pump and go with a straight fixed pump. The conversion kit isn't very expensive.

I could have just left the dial set to 10, but I'm one of those guys that don't like unnecessary parts doing nothing, so I removed it.
 

1Sammy

In The Industry
Jul 20, 2017
177
Windsor, Ontario. Canada
I tied the pump into my home automation system where I have the ability to set the timer in one second increments, so I just set the adjustment dial to 10 and ran it on time. When I needed to replace a part on the pump, I just took that opportunity to remove the adjustable section of the pump and go with a straight fixed pump. The conversion kit isn't very expensive.

I could have just left the dial set to 10, but I'm one of those guys that don't like unnecessary parts doing nothing, so I removed it.
Perfect, thanks. I have the adjustable ( just got it and not installed yet ) and my plan is to leave it on 10 ( 85 GPD ) and use my timer set up to add the correct amount needed per day. In the future if / when i get a replacement repair issue i can then do as you, thanks again.