Hayward RS1500 Pump Will Not Prime

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S

s_mark

Member
Apr 2, 2019
18
DFW, TX
My Hayward RS1500 pump lost its prime.

The lid had a crack, so I replaced it and the O-ring. It still would not prime.

I disassembled it. The impeller and diffuser were badly worn. I replaced them, the impeller gasket, impeller ring, housing gasket, and the shaft seal. It still will not prime even when I force water into it from one skimmer.

I have tried various combinations of skimmer valve and recirculate/filter settings to no avail.

I am at my wit's end. Any suggestions before I give up and either replace the entire pump or call a repairman?
 
Last edited:
A trick I tried is to close the inlet to the pump and fill the pump basket with water. Close the basket cover, start the pump, then crack open the inlet until there is flow.
 
s_mark said:
It's a union fitting. I tighten it with a strap wrench. I read about the "bag trick," but have not tried it yet.
Click to expand...
I had a suction side union leak also and found some gunk on the face of the non-gasket side. Cleaned that up and was able to fix the suction side leak.
 
Randrx2 said:
I had a suction side union leak also and found some gunk on the face of the non-gasket side. Cleaned that up and was able to fix the suction side leak.
Click to expand...
FWIW - I pressurized the suction side and saw a somewhat bigger than a pinhole leak in the tee-fitting between the valves manifold and pump intake line. I sealed it, then the pump primed and ran as it should.
 
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s_mark said:
My Hayward RS1500 pump lost its prime.

The lid had a crack, so I replaced it and the O-ring. It still would not prime.

I disassembled it. The impeller and diffuser were badly worn. I replaced them, the impeller gasket, impeller ring, housing gasket, and the shaft seal. It still will not prime even when I force water into it from one skimmer.

I have tried various combinations of skimmer valve and recirculate/filter settings to no avail.

I am at my wit's end. Any suggestions before I give up and either replace the entire pump or call a repairman?
Click to expand...
When you replaced the impeller ring, did you have the larger side face away from the impeller? having that ring in backwards can cause this issue as well.
If you have any questions about the pump, it is a Hayward Super 2 that was re-branded for Leslie's and sold with the RS designation (and that very convenient handle for carrying the pump).
 
1poolman1 said:
When you replaced the impeller ring, did you have the larger side face away from the impeller? having that ring in backwards can cause this issue as well.
If you have any questions about the pump, it is a Hayward Super 2 that was re-branded for Leslie's and sold with the RS designation (and that very convenient handle for carrying the pump).
Click to expand...
Yes, I installed it correctly. I take photos of everything I work on as I disassemble it.

You might have missed my other message in which I resolved the issue.
 
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