Need help-pump motor stopping...

[fission7x]

Well...
Motor has no identifying marks. Label is long gone-rusted away.
Took a chance and tore the pump apart and, you're right! It's a Sta-rite Dura-glas series pump, 1-HP.
It has a C105-138PEB impeller in it, which according an owners manual I found on the internet, when installed in the P2RA5E-124L Pump, makes it a 1-HP pump. The ratty silver tag near the pump discharge confirms this (I had to fill in the faded numbers/letters that were hard to read with what I learned from the impeller!).

That would make the motor a 1 HP motor - correct?
I assume I'll replace this with a 1 HP, 1.65 service factor motor, such as an AO Smith QC1102/B848?

Hmmm...Now for a crazy question: Apparently, my filter is a Pac-Fab Tagelus, 24" diameter.
Online references say that it can handle a 1 to 2-HP pump.
Could I replace the impeller in my pump with a 1.5 HP impeller (the C10-137PEB, perhaps) and buy a 1.5 HP motor? Thus having a 1.5 HP pump?
Or would it be worth it?
The current 1 HP pump/motor does push sand out on occasion.

Thanks for all your help!!

[Poconos]

If you're pushing sand out with a 1 HP pump then you don't want to go bigger...go smaller. Excessive flow and/or pressure is what's causing the sand to blow past the filter.
Al

[fission7x]

With a 1HP motor and a 24" diameter sand filter it shouldn't be pushing sand out, should it? I have 2 skimmers and 1 bottom suction with 4 return lines each plumbed using 1-1/2" piping. The current pump/motor combo could not handle the bottom suction, 1 skimmer and a Baracuda G4 in the other skimmer - not enough suction - G4 wouldn't move.

So what would y'all recommend? The 1 HP full-rated motor with a 1.65 service factor or the 1 HP up-rated motor with the 1.25 service factor?

I was leaning toward the 1.65 SF, full rated motor AO Smith QC1102.

[hinejs]

Be very leary about upsizing your pump. The additional flow may work against itself overcoming the friction of the 1/5" pipe. Most often the pump was intentionally set as 1 hp because your hydraullic system was designed with a 1 hp pump. to move up in size might require larger eyeballs in the returns at the pool and or swapping out the 1.5" for 2" pipe.

If youre losing sand from the sand filter, perhaps its a crushed lateral down in the the bottom of the sand tank. When was the last time your sand was changed? If its been several years like 5+, nows a good time and you'll have the opportunity to inspect/replace a broken lateral.

[fission7x]

Sand was changed at the beginning of the season, just prior to letting the PB go. PB claimed he checked the laterals at that time and all was well. They could have crushed / dislocated one or more while filling with sand, I suppose.

Y'all have convinced me not to upgrade my pump to a 1.5 HP and I certainly don't want to change the plumbing from 1.5 to 2 inches.

With the pump motor being so rusty, I really can't tell what was originally installed, whether it was a 1.65 service factor of a 1.25 service factor.

After reading what y'all have written, I think I'll be safe and go with the 1.25 service factor, 1 HP motor, AO Smith SQC1102. They claim it's energy efficient, drawing only 6.3 amps as compared to the 7.4 amps of the non-energy efficient pump.