Ac Pump!! Who makes it 510 gph Sea Ray part #948273

Bugsy24

Active Member
Jun 25, 2010
2,171
Freehold, New Jersey
Boat Info
2008 310 Sundancer
Engines
T-350 Mag,Br3's W/Axius
Stayed overnight at a Friends Marina, during the evening the Ac Control shut down and I got
"low Ac"prompt!!! Removed the strainer and there was 4 inches of Muck in It!!!! Started it up again after cleaning it and it shut down again a couple of times !! A friend of mine is a Navy Mechanic and he said that the AC Pump is making noise and shouldn't! Who makes the pump for Cruise-Air???? I'll try some Barnacle Buster before I replace the pump cause I'm sure the pump will be at least 3Bills!!!
 
You can get a new pump online and what you have is probably a March pump of some sort. I replaced mine a few years ago. You can also just replace the head on it. Crap can gum up the internal magnetic bearing and make a grinding noise. Sometimes just pulling it apart and cleaning it will fix it.
 
I managed to save my AC pump after it ingested some gunk by flushing the crap out of it.... plumb in your dockside water hose to the intake side and let it run for a while. Pump impeller will spin freely and this will flush a lot of gunk out of your entire ac system.
 
I managed to save my AC pump after it ingested some gunk by flushing the crap out of it.... plumb in your dockside water hose to the intake side and let it run for a while. Pump impeller will spin freely and this will flush a lot of gunk out of your entire ac system.


Rather than push crud up through the cooling side of the condenser (and possibly turn a $ 300 problem into something bigger), I'd suggest inserting a dock hose at the outlet end. The pumps free wheel so it will take back flow without a problem. That's how I do my winterization of the AC system. Here's a picture. You can see the water exiting from the through hull.

IMG_0981.jpg


Henry
 
I agree that backflushing is a better option, it just doesn't work on my dock very well (no finger pier on the AC outlet side). My experience suggests that flushing through the pick up line works also. You get alot of pressure from the dockside water and it pushes all the junk through. I run my AC units on the hose for about an hour or so to flush everything out
 
BEFORE CHANGING THE PUMP.............."LO AC" means low alternating current........the a/c unit has a built in volt meter that will shut the unit down if the incoming voltage is to low, the pump shouldn't have anything to do with this. You didn't mention if you had water flow. After three "LO AC" faults the system locks out and has to be reset by turning the breaker off, then back on.
 
Last edited:
Oh, Also, Don't forget Amazon.com that is where I bought mine from. I had a gift card in my wallet that I forgot about with $75 bucks on it and I used it so the price was way cheaper for me:grin:
 
BEFORE CHANGING THE PUMP.............."LO AC" means low alternating current........the a/c unit has a built in volt meter that will shut the unit down if the incoming voltage is to low, the pump shouldn't have anything to do with this. You didn't mention if you had water flow. After three "LO AC" faults the system locks out and has to be reset by turning the breaker off, then back on.

I missed that in his post... I get the LO AC error and the things shut down when the power at marinas don't feed enough juice to my boat and voltage is low. It seems to be fairly common for me these days (I would guess 1/4 of the marinas I go to). You need to check what the voltage is at the panel before thinking you have an air conditioner problem. That error has nothing to do with your pump.
 
Thanks Guy's !! Now how do I check the Voltage at the Panel??? I'm guessing by taking the panel off and using a meter to the Breaker????
 
Last edited:
Pump parts.com in Wall NJ up by air port has every thing. Try compressed air 50 psi and put in flush port after pump and leave on and blow air all the mud will fly out do it 2 times a year.
 
Stayed overnight at a Friends Marina, during the evening the Ac Control shut down and I got
"low Ac"prompt!!! Removed the strainer and there was 4 inches of Muck in It!!!! Started it up again after cleaning it and it shut down again a couple of times !! A friend of mine is a Navy Mechanic and he said that the AC Pump is making noise and shouldn't! Who makes the pump for Cruise-Air???? I'll try some Barnacle Buster before I replace the pump cause I'm sure the pump will be at least 3Bills!!!

There should be a tag on your pump that shows make and model number if you want the exact replacement.
 
BEFORE CHANGING THE PUMP.............."LO AC" means low alternating current........the a/c unit has a built in volt meter that will shut the unit down if the incoming voltage is to low, the pump shouldn't have anything to do with this. You didn't mention if you had water flow. After three "LO AC" faults the system locks out and has to be reset by turning the breaker off, then back on.
The pump will turn on, you hear a Buzz (which shouldn't Be!!), you get flow and then after a while it shuts down!!. Later in the evening when it cooled down a little the AC stayed on the whole Night!!! Then we transited back to our Marina.. I hooked up the Ac Cable and within 5 minutes she coded out again!!
 
Ok couple of recommendations. IF you are received LAC (low ac power problem) it could be the ac voltage calibration in the menu located at p22. I will assume you know how to get in the program mode, and scroll to p22, this parameter can be adjusted to calibrate with incoming power if a problem persists with dock power being slightly lower than normal. LAC error is adjustable from 75-105 VAC and can also be shutoff if desired, I believe on p-7 in program mode. So, if you are continuously getting errors, a calibration may be in order, I said MAY. But using a VOM will tell you incoming power to verify.

The pump can also be cleaning, you don't have to get a new pump. March pumps have a cooling circuit(cooling water) that circulated to cool the pump down. When you fill the strainer up with crud, the cooling lines will get stuck up as well. On the photos seen on Ebay and website around, notice the 2 copper lines on the side, these are the cooling lines. They are small and even a small amount of crud will cause them to clog. The pump is a magnetic drive pump so the motor on the pump is protected from locking up so the motor section if probably still good. Take the pump apart and clean the lines, the the motor will not shut down due to overheating. How do I know this, because I clean mine once a year to verify it is not clogged, usually in the winter but last weekend I had to remove to clean it again. Crud all in those small lines and now all is good. Didn't cost me a dime, well except the new seals I put in which I order ahead of time.
 

Forum statistics

Threads
112,950
Messages
1,422,834
Members
60,931
Latest member
Ebrown69
Back
Top