XPost: uk.d-i-y
From: NONONOmisc07@fmguy.com
In sci.electronics.repair, on Mon, 3 Feb 2025 19:31:25 +0000, GB
wrote:
>On 03/02/2025 19:01, N_Cook wrote:
>> On 03/02/2025 17:45, Liz Tuddenham wrote:
>>> N_Cook wrote:
>>>
>>>> Only made a preliminary check o this 1KW pump and float switch in a
>>>> sump, prior to dismantling ad exploring further.
>>>> Sump full of water but no pump action. Moving the float about made no
>>>> differece. Tapping the pump casing made the pump work until the float
>>>> switch dropped to the cut off point.
>>>> Refilling the sump and again no pump action until tapping the casing and
>>>> again stopping properly. I cannot see what in the way of sticky motor
>>>> brush or loose/corroded contact inside the motor housing could produce
>>>> this symptom.
>>>
>>> You haven't said what sort of motor it is, but if it is a commutator
>>> motor with brushgear, the fault could be worn-down brushes to the point
>>> where one of them is almost-but-not-quite touching the commutator.
>>> Tapping the motor gives some sort of contact and then the vibration of
>>> the motor allows it to touch the commutator often enough to keep it
>>> running. This will give a fireworks display around the commutator and
>>> will do considerable damage if it continues.
>>>
>>> If it is not a brush motor, a similar thing can happen if the terminals
>>> have become loose. The sudden shock torque as the motor starts is
>>> enough to make contact and vibration will keep it running; then the
>>> contact is lost again after the motor has stopped.
>>>
>>> The first things you need to check are what type of motor it is and
>>> whether the supply is reaching the terminals in the connection box on
>>> the motor casing.
>>>
>>
>> The pump is a JTFS Mini Micro domestic sewage pumping station,
>> probably JTFS190NN
I see that it has an 8m head. Tha tmeans it will lift the water that
far, right? 26 feet!! Does BIL really need that much. It says it's
good for sewage but says, if I read correctly, nothing about a
macerator. Maybe it's good for sewage just because people with a toilet
below grade need a pump. But in BIL's case, mMaybe the toilet itself is
self-macerating, or maybe there is no toilet ) .
I have a sump pump that only has to lift the water about 8 feet,
although it's probably rated a lot higher. Around here they sell them
with 1/3 and 1/2 horsepower motors, the smaller one for under $40 or 50.
Maybe that's all he needs? (I replaced mine once, with the same
thing, 1/3HP. Once onlyu in 41 yers it could not keep up with the rain
and the rain around the foundation, with corrugated perforated 4"
plastic pipe leading to the sump inside the basement, flooded the
basement a bit. I wish I'd bouht the 1/2 HP. )
>> No type technical details found but no obvious external starter cap
>> outside the motor casing or casig bulge.
>> The other consideration is it was installed 10 years ago, tested working
>> then, but never heard to be working since.
>> It should have worked in a flood situation last year but it did not
>> (automatically of its own accord that is) , no maintainece or testing or
>> inspection in those 10 years by the owner or anyone else.
>
>My BIL has a sump pump for his basement. It deals with any water
>penetrating, as well as the stuff from the toilet in the basement. It
So your BIL has a toilet in the basement, but doesn't use a special
pump? Just a standard sump pump. Is the toilet self-macerating?
>needed replacement, but that only cost around £70-80. Having seen that
>your one costs around £800, I can see why you are so interested in
>repairing it!
>
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