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Telma Retarder Rebuild

(@gse_uk)
Member
I have 2 Telma retarders from the Volvo B10 bus to rebuild for my hub dyno project. But unfortunately the first one I have stripped has broken external coil wires. Has anyone successfully been able to remove the coils without destroying them in the process? They seem pretty well stuck in place. I am hoping to be able to carry out a repair on the removed coil
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Topic starter Posted : 25/11/2020 7:19 pm
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(@gse_uk)
Member

I would attach a couple of photo's but I can't see the "choose file" to attach them. I have removed the pole shoes

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Topic starter Posted : 25/11/2020 7:33 pm
(@gse_uk)
Member

Found the "Attach file"

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Topic starter Posted : 25/11/2020 8:05 pm
(@gse_uk)
Member

2nd photo

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Topic starter Posted : 25/11/2020 8:07 pm
(@slider)
Member

Yup, the coils are pretty stuck in old eddy brakes, i had to destroy them all to get removed 😄

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Posted : 26/11/2020 7:55 pm
(@gse_uk)
Member

What did you do for replacement coils?

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Topic starter Posted : 26/11/2020 9:29 pm
(@slider)
Member

The insulation resistance of the coils were too low, so i had to replace them. I made new coils myself from a new aluminum coil wire.

I hope you have measured your all coils with insulation resistance meter...

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Posted : 26/11/2020 9:40 pm
(@gse_uk)
Member

Not got that far yet, think I will have to rewind all of them too, do you have more info on how you rewound your coils such as the spec of wire used and insulation materials etc.

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Topic starter Posted : 26/11/2020 10:17 pm
(@slider)
Member

I used same diameter coil wire as the original coil wire was. I wind the wire about 240 loops (if i remember correct) to get same resistance as the original coils. I used 2mm rubber mat to insulate the inside and the ends of the coil, outside i just wrapped with electrical tape 😄 This might not been the right way to do it, but it has worked several years now 🙂

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Posted : 27/11/2020 7:19 am
(@gse_uk)
Member

Thanks for the info

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Topic starter Posted : 27/11/2020 6:11 pm
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