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HomeTurbine✈️Aircraft🚁HelicopterTurbine Helicopters › jetcat pump failure
08-24-2008 09:14 PM  12 years ago
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monkey nuts

rrApprentice

chester england

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jetcat pump failure
my pump seemed to be working intermittenly. i checked the filter and it was quite clogged. ive now cleaned it out and put a higher voltage through the pump (about 4v)i assumed it would blow out any muck. it seemed fine.anyway had 4 flights today and on the 5th it wouldnt start. brought it home and the pumps not running again, it doesnt run untill you put about 3.5v through it/. once it has started you can lower the voltage to 2v an it carries on running. but if you stop it and then start it wont run! untill the higher voltage is applied. whats caused this? i have a new pump but dont want to change it untill i know? does it matter how you mount the pump, which way up?
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08-24-2008 11:45 PM  12 years ago
PETER ROB

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Devon UK

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Gareth, Try mounting your pump down near the baseplate, remember the pump is designed to pump not suck, so being lower than the fuel tanks,it might help
The pump on the Jetcats has always been its weak point,tried other ones, but they do not work well with the ECU
If you have the new one one fit it and save a lot of hassle, then take the cover off the old one and see how much wear there is in the top plate
Peter R
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08-25-2008 12:19 AM  12 years ago
monkey nuts

rrApprentice

chester england

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i may clean out the fuel tanks to mke sure there are no bits in there. the last thing i want is to put the new one on and there be bits already in the tank. i will cleam them out tomorrow.

i cant see any where near the bottom with out it being to close to the exhaust.
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08-25-2008 12:42 AM  12 years ago
seattle_helo

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Seattle, WA USA

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The filter was quite clogged? Wow. I'm just curious, what fuel do you use and where do you get it?
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08-25-2008 07:32 AM  12 years ago
PETER ROB

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Devon UK

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I'm just curious,
Nick, This is a new machine for Gareth, one of my old ones, bought from Matt, and I know where he got his. A1 fuel from, but not how it was stored or fueled, also what other mixes Matt has used?
Gareth, That was the reason for putting the fuel pump between the sideframes, to keep it low
Peter R
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08-25-2008 10:03 AM  12 years ago
monkey nuts

rrApprentice

chester england

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i will probably put it back in the frames then, but keep the filter outside.

it seemed to be blocked with the aluminium dust from the pump, it also seemed to be quite sludgy.
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08-25-2008 02:21 PM  12 years ago
PETER ROB

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Devon UK

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blocked with the aluminium dust
That usually comes from the gears rubbing against the top cap of the pump, which now means there is a bigger gap between the gears and the top, erractic fuel flow
Peter R
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08-25-2008 08:16 PM  12 years ago
monkey nuts

rrApprentice

chester england

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im charging my camera up and i show you the inside of the pump. it is grooved, you can feel the step just about with your finger.
ive put the new pump inside the frames, ive got the filter on the outside. is there anythink i need to do before starting it. ive primed the pump with a hand pump and have run it. what should the pump voltage be set to? ive read you need to have it a little higher until the pump is run in.
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08-25-2008 08:41 PM  12 years ago
PETER ROB

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Devon UK

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Gareth,Now the pump is primed, disconect the pipe after the filter and do a pump test this will clear any air trapped inside the filter,
You can only alter he pump start voltage, so leave it alone, you already know how to adjust it to get your kero working, and that was fine
Peter R
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08-25-2008 08:53 PM  12 years ago
monkey nuts

rrApprentice

chester england

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ive just ran it after the batteries have charged, it starts ok. no flames! it gets to full power much quicker now. excellent.
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HomeTurbine✈️Aircraft🚁HelicopterTurbine Helicopters › jetcat pump failure
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