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Thread: take pump apart

  1. #1
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    take pump apart

    Hi, I have a pump that was replaced years ago that I kept so I could take it apart and see why it failed. No biggy just wanted to see what was inside these things but I can't see how it comes apart. I got the motor off but I can't get into it either. There were four little screws on the outside of the casing but they didn't seem to release any thing. Didn't seen any set screws on the shaft or anything. Any idea how to get into this thing?

    Dempster pump, 2hp, #HB200

    Misc. info
    Failed after ten years about ten years ago.
    well depth 750 feet
    pump set at 500 and something

    Pumps out sand and mud sometimes. I figure that's what killed it.

    Thanks

  2. #2
    Pump guy speedbump's Avatar
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    I assume this is a submersible pump. I haven't heard the Dempster name in a lot of years. If it is a sub,there won't be much to look at if you do get it apart and they are pretty much non rebuild able.

    bob...

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  3. #3
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    Yeah itís a submersible pump. I wasnít going to rebuild it, just wanted to see why it failed since it quit after ten years and the one thatís down there now is ten years old. I figure Iím due for another pump soon and wanted to make an intelligent choice base on the findings. So I got it apart and here is what I found if anyone is curious:

    Both ends look to be cast brass, are threaded and screw into the casing. I suspected they might but they did not yield to initial efforts to unscrew them. However, a blowtorch and a bigger hammer took care of that. Once I saw the threads on the top fitting a bigger vise and a bigger pipe wrench took care of the other end. The impellers were plastic and appeared to be in good shape. The bearing (actually just a bushing) was wobbled out. The motor shaft had a lot of play in it too. The motor windings had continuity but I donít know what they should ohm out to so I chucked it up and plugged it in. It hummed a little but it didnít run. Didnít even blow the breaker. So I figure the bearings failed and eventually killed the motor.

    So, are bushings typical on submersible pumps? It would seem like sealed roller bearings would be better.

    Anyway, would anyone like to make a suggestion for my next submersible pump? The well is 750 feet and the pump is set below 500 feet. Is there a pump that will handle sand/silt in the water better than others? Iíd like to lower it a little deeper next time since the water levels keep dropping.

    Thanks

  4. #4
    Pump guy speedbump's Avatar
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    Bushings are the norm. No roller bearings in subs. The motor probably just wore out since 7 years is normal life of a sub.

    There is no sub that is better than another in my opinion. They are all pretty much the same. The big box stores don't have a selection, so stay away from them.

    I can recommend a sub if you can tell my what your needing in gpm and pressure.

    bob...

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  5. #5
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    Ok. This is what I know about the pump that is installed now:
    Motor and pump are about 4í long

    Pump
    Dempster 4Ē submersible pump HB200
    Series H
    20 GPM
    23 Stages
    261 PSI

    Motor

    Franklin Electric
    Model 2243016314
    3 wire
    2 HP
    V 230
    PH 1
    Amp 10
    RPM 3450
    Has lighting arrestors

  6. #6
    Pump guy speedbump's Avatar
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    That is really a 10 gallon per minute pump. A two horse with that many impellers could not produce 20 gpm at it's efficiency point or even near it. The pump you have is made to go quite deep. The closest pump I have to it is the ten gpm 2hp with 20 stages and it will make 281 psi.

    bob...

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