Help please before I blow up another old motor..

[Beanwood]

Thanks to @angellonewolf I have the use of a megger
having taken the cover off I can see the melted wire that caused the smoke and fuse to blow. Before I bother to repair that- where would I stick the probes to check for insulation failure?

Measuring across the live and neutral supply leads gives me 103ohms - which seems ok?

 

[Beanwood]

I may have answered my own question as there is 103 ohms from live to earth as well

 

[Beanwood]

Ok cover is off and it’s worse- broken and toasted cables

 

[Red'n'Black]

Ok cover is off and it’s worse- broken and toasted cables
View attachment 459597

That'll mend.

First job is to carefully unscrew that paxolin sheet so you can see where the wires meet the ends of the windings. Snip the ends of the wires off the solder tags as you'll be fitting new wires anyway.

How are you with soldering?

 

[Beanwood]

I guess this should be connected!

 

[Beanwood]

That'll mend.

First job is to carefully unscrew that paxolin sheet so you can see where the wires meet the ends of the windings. Snip the ends of the wires off the solder tags as you'll be fitting new wires anyway.

How are you with soldering?

I'm not the best at soldering - but I'm fairly confident I can make thngs connect..

I presume I need to chop back the bit which has broken (Very brittle) and that may mean cutting back the sheath. Can I use heat shrink to cover it again?

 

[Red'n'Black]

I'm not the best at soldering - but I'm fairly confident I can make thngs connect..

I presume I need to chop back the bit which has broken (Very brittle) and that may mean cutting back the sheath. Can I use heat shrink to cover it again?

I'd buy some new wire (or cut up some 13A flex) rather than sleeving over the crumbling old stuff. But yes, heat-shrink sleeve over the joints. You may have to cut it right back to where it meets the winding.

 

[angellonewolf]

That'll mend.

First job is to carefully unscrew that paxolin sheet so you can see where the wires meet the ends of the windings. Snip the ends of the wires off the solder tags as you'll be fitting new wires anyway.

How are you with soldering?

i can solder if need if i have what needs conected to where not a problem

i might have flex here as well

 

[angellonewolf]

still need cheak the windings before doing work

 

[angellonewolf]

keep the wires apart and do the tests befoe going forward

im sure someone on here will say how to test all the windings

 

[Beanwood]

I'd buy some new wire (or cut up some 13A flex) rather than sleeving over the crumbling old stuff. But yes, heat-shrink sleeve over the joints. You may have to cut it right back to where it meets the winding.

Yep - I've cut it back to the winding and put a new tail on.
Now I just need to work out what goes where for Live Neutral and earth...


Two ends of the main winding must go to +ve nd -ve obviously.

The starter circuit - which has the capacitor, some type of switch (Centrifugal I guess driven by weights off the shaft?) and the start windings are all in series. I guess it doesn't matter which end the +ve attaches?

I'm slightly confused as there were two wires attached to various posts (In picture 1 you can see the fried remains on a post, that black lead with red ring goes to the capacitor), but also a loose one.

keep the wires apart and do the tests befoe going forward

Yep- I think it’s all good

 

[Screwdriver]

I would go as far as to say that looks pretty good. Considering it's age. Very likely all bearing and bushings were stuck from being stood and excessive friction caused the thing to overheat. My old linisher just did that to me first time I tried to fire it up after leaving it unused for too long.

 

[Beanwood]

I would go as far as to say that looks pretty good. Considering it's age. Very likely all bearing and bushings were stuck from being stood and excessive friction caused the thing to overheat. My old linisher just did that to me first time I tried to fire it up after leaving it unused for too long.

Thanks it’s all lovely and clean bearing wise - I think the problem was definitely cracked and dodgy wiring.

Just need to work out how there were 3 wires going in and where they should be connected

 

[Beanwood]

I'm not convinced this was wired correctly in the first place

How can I identify the starter coil vs the main coil.

Is it possible to wire the coils incorrectly - with one going the opposite 'way' to the other, or just so long as there's a +ve and -ve feed to each?

 

[Dave-sparks]

Is it possible to wire the coils incorrectly - with one going the opposite 'way' to the other, or just so long as there's a +ve and -ve feed to each?

As it is AC you have live and neutral rather than +ve and -ve

Reversing the L and N of one winding will cause the motor to spin the opposite way.

 

[Beanwood]

As it is AC you have live and neutral rather than +ve and -ve

Reversing the L and N of one winding will cause the motor to spin the opposite way.

You're right of course - that was just me being lazy. Thanks - so it's safe to connect them both up either way, and swap one if I need to reverse direction.

 

[6ply]

I'm not convinced this was wired correctly in the first place

How can I identify the starter coil vs the main coil.

Is it possible to wire the coils incorrectly - with one going the opposite 'way' to the other, or just so long as there's a +ve and -ve feed to each?

 

[6ply]

 

[Beanwood]

View attachment 459830
View attachment 459831

Thanks @6ply - it has a centrifugal switch, and a capacitor - so good there.
Just a few snapped wires I want to ensure go in the correct place.

 

[6ply]