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Thread: Polaris 3900 Adjusting Problems

  1. #1
    Senior Member maxepr1's Avatar
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    Polaris 3900 Adjusting Problems

    I'm trying to help out a neighbor with his Polaris 3900 and we have been working on this thing for hours and can't get to drive right! I have adjusted Polaris's before and there is a bit of trial and error but this thing come on! When set in the water it starts running straight but the front wheel seems to always want to be about 1" off the floor, adjust the rear jet seems to do nothing? Then after going straight for 10' or so it just starts to lean over at a 45* angle and do tight donuts ? Then of course the hose is all twisted up and puts tension on the cleaner and it can't correct itself. If I correct it the whole process starts over again? With my 280 you can adjust the float and rear jet and fix these problems but this has no float and I've played with the rear jet and I can't get anywhere? He taken it to the pool store and they tell him it's fine theres nothing wrong with it. It's brand new. The RPM test reveled 35 RPMs so it's got tons power, and it moves pretty fast! Anybody have any experience? Also I checked the drive jet for debris and there was none, obviously because it runs around like crazy!
    40'x19' IG Diamond Brite 29K 4' Waterfall/Dive Rock FNS60 DE 2x2hp Whisperflo pumps Aqualogic(P4) SWG TF100 Tester


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  2. #2
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    Re: Polaris 3900 Adjusting Problems

    I understand it's new but it really sounds like the float is cracked and flooded. There should not be any air in it.

    Scott
    Owner of - PoolGuyNJ LLC
    Expert Pool and Spa Repairs, Renovations, and Augmentation. Helping people decide what is the right gear for meeting their needs. Expectations Set, Expectations Met, No Surprises.

  3. #3
    Senior Member maxepr1's Avatar
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    Re: Polaris 3900 Adjusting Problems

    Scott where is the float on a 3900? My 280 is right out in the open, 3900 don't know?
    40'x19' IG Diamond Brite 29K 4' Waterfall/Dive Rock FNS60 DE 2x2hp Whisperflo pumps Aqualogic(P4) SWG TF100 Tester


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  4. #4
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    Re: Polaris 3900 Adjusting Problems

    Same place but sandwiched between the silver plastic on top and blue plastic below.

    Scott
    Owner of - PoolGuyNJ LLC
    Expert Pool and Spa Repairs, Renovations, and Augmentation. Helping people decide what is the right gear for meeting their needs. Expectations Set, Expectations Met, No Surprises.

  5. #5
    Senior Member maxepr1's Avatar
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    Re: Polaris 3900 Adjusting Problems

    Ok, I thought that was all hard plastic. Sliding that back and forth should take care of wheeling but what about the circling, Scott?
    40'x19' IG Diamond Brite 29K 4' Waterfall/Dive Rock FNS60 DE 2x2hp Whisperflo pumps Aqualogic(P4) SWG TF100 Tester


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  6. #6
    Senior Member maxepr1's Avatar
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    Re: Polaris 3900 Adjusting Problems

    Scott, did some more investigating on the float. Hard plastic clear, embedded in the body, I don't see any way adjust it though? It's fixed, can't move it back and forth like on the 280. So I'm guessing polaris has it in optimum position?
    40'x19' IG Diamond Brite 29K 4' Waterfall/Dive Rock FNS60 DE 2x2hp Whisperflo pumps Aqualogic(P4) SWG TF100 Tester


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  7. #7
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    Re: Polaris 3900 Adjusting Problems

    I suspect the float is cracked. Isn't this thing under warranty?

    Scott
    Owner of - PoolGuyNJ LLC
    Expert Pool and Spa Repairs, Renovations, and Augmentation. Helping people decide what is the right gear for meeting their needs. Expectations Set, Expectations Met, No Surprises.

  8. #8
    Senior Member maxepr1's Avatar
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    Re: Polaris 3900 Adjusting Problems

    Yes, under warranty. I see no cracks and no water inside? When she took it to the PS I guess a polaris rep. happened to be there and went over the vac. and found nothing wrong with it? It's 2 month's old.
    40'x19' IG Diamond Brite 29K 4' Waterfall/Dive Rock FNS60 DE 2x2hp Whisperflo pumps Aqualogic(P4) SWG TF100 Tester


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  9. #9
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    Re: Polaris 3900 Adjusting Problems

    Hello there, I am the neighbor with the 3900, and there is no water in the float, this thing just wont stay on the ground with all 3 wheels.

    Someone please help!!
    24'x15' 4.5 deep (avg) 13000 gallon pebble bottom in ground playpool
    Cartridge filter with a hayward 2.5hp pump.

  10. #10
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    Re: Polaris 3900 Adjusting Problems

    I think I found a problem, maybe not the problem, but a problem. I was standing there watching it go in circles and noticed that the bag, was not inflated, so I pulled it out of the water and removed the bag and 2 of 3 the jets were working, but barely. could this cause it not to stay on the bottom?

    Alan
    24'x15' 4.5 deep (avg) 13000 gallon pebble bottom in ground playpool
    Cartridge filter with a hayward 2.5hp pump.

  11. #11
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    Re: Polaris 3900 Adjusting Problems

    Hey there. I'm having the same problem with my 3900. 2 out of 3 Venturi jets are clogged. I have beat my brains out for hours trying to get this thing adjusted and I have gotten no where. Did you ever find a solution? I'm about to the point where I'm going to go buy another 280.
    IG w/ raised spa
    All Pentair equipment, Pentair DE FNS Plus 60 sqft, 2 Pentair 2.5HP Whisper-flow Pumps, Pentair 320 Chlorinator,Pentair MiniMax NT (400,000 btu?), 3/4 hp booster pump with polaris 3900, Manual timer with no automation, & Diamond Brite (Caribbean Blue? according to builder)....And TF100 XL Test Kit!

  12. #12
    Senior Member maxepr1's Avatar
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    Re: Polaris 3900 Adjusting Problems

    Yes, it's better than it was. Still not like the 280 though. The jets are more likely to clog on the 3900 which cause strange problems with it that do not occur with the 280 or 380. 3900 always seems to want to ride with the back end lifting (1-2 inches) off the floor. No matter what the back jet is set. Polaris rep came and set it and what he said was "Perfect" I wouldn't call "Perfect"!
    40'x19' IG Diamond Brite 29K 4' Waterfall/Dive Rock FNS60 DE 2x2hp Whisperflo pumps Aqualogic(P4) SWG TF100 Tester


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