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Pump or Motor: To Replace or Not to Replace… That Is the Question

Pool Pump or Motor

If you’re reading this then there is a good chance that your pool pump is down, the anxiety is up and the algae monster is ready to pounce on your pool. After years in the pool industry, I can tell you many a homeowner has contacted us in a panic with a dead pump. The scenario usually goes as such: they or their tech has the pump apart and they are pondering the options that lay before them. They may know what they need but want to know if it’s worth the work to get the pump up and running. One of their major questions is, “Is it worth it to get a whole new pump or should I just get a motor?” The cost between a simple motor replacement and a pump installation can be sizeable. That difference in price makes it important for you and your wallet to know when to call it quits on an old pump.

Wreck-it or Recover it?

Our first step will be to determine the overall health of your pump. Over the years, this rugged piece of machinery has been subjected to blazing heat, driving rain and even lightning strikes. These conditions can drag down their overall health. The pump’s internal parts, as well as the housing and motor, can go bad and require replacement. When determining the magic number of replacement parts cost versus the cost of the whole pump, we generally suggest 60-75% as the standard. If the cost to repair is within or over this range, it is smarter to replace the pump. This way you have a brand new pump and warranty covering any mishaps down the line. There are a few other things to look out for when checking pump health.  The key points are listed below.

  • Dry Rotted or Cracked Housing – Besides a motor, the housing is the most expensive part of a pump to replace.  If your housing is showing signs of deterioration, take a close look at the other parts of the pump. For example, the pump lid, basket, and impeller could be in need of repair as well. When totaling up the necessary replacement parts, keep in mind the magic number of 60-75%. If you get to that range, it could be time to replace the whole thing.
  • Pumps older than 12-15 years – If it was a car you would have gotten rid of it by now. Sadly, unlike some vehicles, pumps do not appreciate in value as they get older. Pumps approaching this age see frequent breakdowns and repair. The cost of maintenance soon starts to outweigh the value of the old pump.
  • Obsolete Parts – Some pumps for whatever reason are discontinued by their manufacturer. At that time, essential parts can be increasingly hard to find or unavailable. Review our pool parts section for your unit’s parts breakdown to determine their availability.
  • Bronze or Cast Iron Pumps – Metal pumps were the standard for pools decades ago but they have been phased out. High strength composite materials have taken their place in the sun. The metal pump obsolescence has made parts hard to come by. If you are able to find the part, it will be at a premium.

Motors: Listen and Learn

If your pump’s wet end does not have any of the above red flags, a motor maybe your best option. First on the list when determining the status of your motor is to just be quiet and listen.   The sound that follows a flick of the power switch can lend a big clue to what motor issues lie ahead. Motors, for the most part, are simple beasts. Once installed a motor needs little if any maintenance to keep it running. If a properly running motor starts to make any of the following noises, a replacement motor could be your next purchase.

  • Loud Screech or Grinding  – If your pump sounds less like an electrical motor and more like a Boeing Jet then your bearings are bad. Besides the age of the motor, these bearings can rust or freeze from the water inside the casing. The most common causes are a leaky shaft seal, flooding or even errant sprinkler spray. Bearings are the joints that spin the shaft freely or in this case cause you severe ear pain. The good thing is bearings can be replaced on the cheap. If you’re looking to go this route, then view our selection of pool motor bearings. If you do go this route keep in mind you will need a specialized tool called a bearing puller to remove the bearings.
  • Humming Sound – Hmmm, what’s the cause? It’s the capacitor! This little barrel of fun stores an electrical charge to be dispersed to either kick start or keep your motor running. There are two types of capacitors, run (silver) and start (brown.) A blown capacitor is caused by a surge in power or overheating and is an easy fix for a handy homeowner. For the guide on replacing a capacitor, see our guide.
  • Pop and a Click – Once your motor is tripping the breaker, it is on its last legs. When a motor is flipping the breaker, it is a sign of a deeper electrical issue.
  • Silence  – First check your power source. If that is fine then no, your pump is not resting. It’s dead. The silence is a sign that the inner workings of the motor have completely failed, i.e. the shaft has frozen. A motor that has reached this point is beyond repair.

Inspect your Gadgets

Legislators in pool heavy states like Arizona, California, Florida, and Texas have recently put strict regulations on replacement motors and pumps. The new regulations may require homeowners to upgrade their pump to dual or variable speed. The changeover to dual and variable speed pumps is meant to lessen the load on the electrical grid. The effect is also seen in the customer’s pocketbook. Dual speed and variable speed are designed to use less electricity thereby lowering your power bills. To help aid the transition, power companies are providing customer rebates when homeowners install new, qualifying motors. Check with your power company for the specific rebate details.

If you want more information on how these motors can save you money, read the following guides: How to Save Money Using a Variable Speed Motor or How to Replace a Single Speed Motor with a 2Green Motor

author avatar
Matthew Simmons Technical Writer & Pool Product Expert
Swimming pool expert at InyoPools and host of Poolside Chat, brings over a decade of experience in the pool industry.

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63 responses to “Pump or Motor: To Replace or Not to Replace… That Is the Question”

  1. Christian Avatar

    I have a 5 1/2 year old house, pool and Sta-Rite PHK2RA6E-102L pump and it was working fine with no unusual noises. I went to turn it on yesterday and all it does is trip the breaker right away. I don’t get any noises or hums before it trips or hear anything. I flip the lever to manually turn it on and it trips right away. I am in South Florida and it has rained a lot the past couple days but nothing that hasn’t happen before. Could it be a bad breaker, wiring, timer or the pump/motor? Shouldn’t this pump last longer than 5 1/2 years? Thanks!

    1. Matthew Simmons Avatar

      To test the breaker, move the pump to a different breaker to see if it trips or not. It could be the rain, that is somehow tripping the circuit. if you do not feel like waiting til the pump dries out, I suggest running new wires, or check the voltage of the lines on the pump side.

      Unfortunately, new pump motors are lasting only 2-5 years nowadays. It is just the way they are built, they do not make them the way they used to. Give us an update.

  2. Renea Avatar

    I have a 1 year old Hayward variable speed pump (SP2300VSP, I think) that works great. However, winter seemed to sneak up on me & water froze in the pump housing. There is now a small crack in the threads of the outlet. I can still run the pump with just a very small leak. If I decide to replace the pump housing does it have to be the exact model or just something that fits the frame of the motor?
    Thanks!

    1. Matthew Simmons Avatar

      The same model pump housing needs to be used because the diffuser, impeller and seal plate will not fit on a different housing. Unless you plan on replacing all those parts, which is costly, I would just buy the right one.

  3. Holly in Houston Avatar

    Help….my husband is out of town and I have a dead pump. The pool repair guy is saying that we should replace the pump, but my husband is saying we only need to replace the motor. HELP!

    1. Matthew Simmons Avatar

      I suggest giving our tech support line a call because we need more information to figure out what is the matter. We can be reached at 407-834-2200

  4. Crystal Avatar

    I turned off my pump the other day and cleaned everything. The next day I went to turn it on, nothing. The breakers tripped. Little more inspection, it would buzz with nothing. Found out it need to be started by hand. No problem, got it going, haven’t had any problems. Now we can get it going but the suction is not strong enough to pull enough water. Does the starter/compacitator have anything to do with this, or does it sound that more than likely the the pump is dying?

    1. Matthew Simmons Avatar

      Usually, when there is a bad hum and it needs a hand start, the capacitor is failing. Luckily, replacing a pool pump capacitor is relatively easy and inexpensive. Did you need any help finding a replacement capacitor?

  5. Mike Avatar

    I have a question about bearings…. my pump would not start at first.. It would only hum. Turns out the rotor assembly was stuck and would not turn. I used a screw driver to turn it manually and then it would start. Now however, it shrieks when it runs. It’s two years old. The bearings look good and turn easily – and silently – by hand. Could this shrieking be bad bearings even though they turn quietly by hand, or could it be the caused by a rusty rotor wearing on the motor coil in the housing?

    1. Matthew Simmons Avatar

      So you opened the motor to view the bearings, but didn’t bother just to change them out of precaution? That would save you from having to crack it back open to replace them later.Also if you opened the motor to see the bearing, you probably could have found any rust that was lingering in the motor.

  6. Jr Avatar

    My pump turned off . I went to reset an the breaker trips. Every time I reset the breaker a loud noise (like an electric shock) in the motor and trips the breaker.i inspected the motor and it’s not stuck it rotates fine ,

    1. Matthew Simmons Avatar

      Have you tried putting the motor on a different breaker? This will determine if the motor or the breaker is at fault.

  7. Vito Avatar

    What HP would you recommend for an inground 60,000 litre / 16,000 gallon pool. Please keep in mind that the pump location is about 3ft above the pool deck. Thanks.

    1. Matthew Simmons Avatar

      To figure out the correct pool pump size, you will need more information to calculate flowrate and run time. Follow the steps we mention in the pump selection guide for the best results.

  8. valerie Avatar

    how much is a housing unit for my pool pump

    1. Matthew Simmons Avatar

      What model is your pool pump?

  9. Justin Avatar

    My motor sounds like it always has, but just 50 times LOUDER. Would that be the bearings? Also, if my motor needs replacing, how do I know which motor is compatible? My particular motor (Marathon 1HP) is discontinued. Are they pretty universal once you get the voltage, HP, Frame type down?

    1. Matthew Simmons Avatar

      If the motor is super loud, then it is likely the bearings. If you are brave, you can try replacing the bearings, but I always prefer to replace the whole motor.

      Though Marathon is no longer around we can still get you the right motor. To find the right motor replacement we just need the Part, Catalog (CAT), or Model (MOD) number to identify it. We have a blog on how to read a motor label too.

      If your label is too sunbaked to read, find the Pump’s model number on the pump housing. The model number is also important in finding the correct shaft seal to complete the motor replacement. If you don’t replace the shaft seal along with a new motor, you’ll be hearing that bad bearing sound, very soon.

  10. Jenkins Leroyson Avatar

    These are some great things to consider about your pool pump. We’ve been trying to decide if we should repair or replace ours. The cost range to repair you gave is perfect.

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