graveley magneto

[hybridv8]

Are there any magneto experts on here, I have a question about my magneto on my graveley walk behind tractor, I have a single red wire coming out of the coil that goes to the spring part of the points it is joined by the wire from the condenser and a wire that goes through the body to the kill switch but even with the coil wire disconnected I have continuety between the coil wire and any point on the tractor as though there is a direct connection,my question is has the coil broken down or is this correct.

[charlie]

This article has a basic circuit diagram for a magneto circuit.

[hybridv8]

Thanks charlie.

[wristpin]

That wire goes to the coil primary winding. The other end of the winding is earthed so you will have continuity.

[steeltailor]

Hello, what sort of gravely have you got, have you sorted your problem? Do you have any spare attachments? Regards, Chris

[hybridv8]

Sorry for the delay in replying I’m just getting over food poisoning so I have not been viewing, I have a model L super convertible and no I only have three attachments so none spare,Hi wristpin I understand the points need an earth but I started her up and the stop button wouldnt stop her so I put a meter on the stop wire after I had disconnected it and found it had continuity to everywhere on the frame which to my simple mind negated the stop button because it was already earthed,somewhere along the way I have obviously not got it straight in my head but I presumed the stop button shorted the coil to earth but if it is already earthed whats the point of the button,anyway I found a magneto specialist at the other end of our village so they are going to give it the once over (eventually , they are not quick workers ).

[steeltailor]

Hello, thanks for the reply. In the last few days I have just bought another gravely. This time a 12 hp one. Complete with rotary plough. It is in full running order. My other gravely is a 6.5 hp L1, built 1961. I have also got a rotary mower deck and a cylinder mower deck. I would like to find some other attachments such as a rotary sweeping brush and a snowblower. And may be anything else that was interesting. (I do have a 12 hp gravely for spares, though I would like to repair it, the engine on it is absolutely wrecked.) I may have to engineer a way to fit a Honda type engine.

What type of attachments do you have?

[hybridv8]

I have a rotary plough,30 inch rotary mower and a rotovator,I have been looking for another gravely myself and attachments but they are quite rare you were lucky to find yours.Do you know of anywhere in this country that carries spares for them I have been buying from america which is costly and time consuming waiting for delivery.I have read about a conversion to a honda type engine and it seems very involved.

[steeltailor]

Yes, too right, it is quite an engineering job to fit a different type engine. I don’t know of a stockist for spares. I have got some ring gears and planetary gears as spares and I have got a friend who has several machines and a few spares, but I have had to buy a couple of parts from America. So far nothing too significant, only a main jet for a carburettor. Though freight charges more than doubled the cost of the part from £18 to £38 I have got three machines and a spare 12 hp with the blown and derelict engine. Plus I also have a single wheel gravely d Imperial.

Whereabouts are you based? I am between Grantham and Sleaford

[hybridv8]

I am based in swindon

[steeltailor]

Not exactly on the doorstep then. You will go and live in those remote and inhospitable backwaters!!

[steeltailor]

I have a set of dual wheels. I have also acquired a set of four solid tyres. They may be useful for mowing thorny brash.

[wristpin]

Are there any magneto experts on here, I have a question about my magneto on my graveley walk behind tractor, I have a single red wire coming out of the coil that goes to the spring part of the points it is joined by the wire from the condenser and a wire that goes through the body to the kill switch but even with the coil wire disconnected I have continuety between the coil wire and any point on the tractor as though there is a direct connection,my question is has the coil broken down or is this correct.

Going back to your original post , I think that you are “ over thinking” the issue as it all seems to be as it should. It runs, and it stops. Both the primary and the secondary coil winding are grounded at one end so a meter connected across their respective windings will always show continuity. The kill wire disconnected from the points should not show continuity between itself and ground unless there is either a fault or the kill button is pressed. That’s all there is to it.

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